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Invention relates to radio electronics and can be used as a preselector stage. Proposed unit comprises differential transformer. Primary of the latter has two output terminals. Differential secondary has tree output terminals. First group of N band filters is connected to first output of differential winding. Second group of N band filters is connected to third output of differential winding. Outputs of band filter of first and second groups make the outputs of filtration unit. Note here that first and second capacitors are connected to first output of transformer primary. Second output of first capacitor is connected to input potential terminal of filtration union. Second outputs of second capacitor and primary are integrated with common bus. Second output of differential winding is connected to third capacitor with its second output connected to common bus. |
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Thermally stable narrow-band surface acoustic wave filter Invention relates to acoustoelectronics and can be used in making thermally stable surface acoustic wave filters. The thermally stable narrow-band surface acoustic wave filter comprises an acoustic line - a piezoelectric substrate with interdigital transducers formed on its surface; on the reverse side the substrate there is a flat metal or dielectric plate with through-holes on edges of the plate, through which the plate is mounted to the acoustic line and simultaneously to the mounting support of the housing using a rubber-like adhesive with a high coefficient of linear thermal expansion; the plate is mounted in the central part to the acoustic line by a thin layer of a rubber-like adhesive with a high coefficient of linear thermal expansion; between the mounting support of the housing and the plate there is a gap which is greater than the sag of the mounting support of the housing at subzero and above-zero ambient temperatures. |
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Wideband differential attenuator Wideband differential attenuator comprises 1st and 2nd inputs with 1st resistor connected there between. 2nd resistor is connected in AC circuit between device 1st output and common bus. 1st load capacitor is connected in parallel with 2nd resistor. 3rd resistor is connected in circuit between 1st correcting capacitor, 2nd counter phase input and 2nd counter phase output. 4th resistor is connected in AC circuit between 2nd counter phase output and common bus. 2nd load capacitor is connected in parallel with 4th resistor and 2nd correcting capacitor. Device 1st output is connected with the device counter phase output via 1st correcting capacitor and 1st extra inverting current amplifier, all connected in series. 2nd counter phase output is connected with the device 1st output via 2nd correcting capacitor connected in series with 2nd extra inverting current amplifier. |
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Flat inductance coil with increased magnification factor Flat inductance coil with increased magnification factor, near which a layer of magnetic material is arranged, is characterised by the fact that the magnetic material layer, the value of relative tangent of magnetic losses of which is <10-4, is located tightly to external and/or internal boundaries; with that, sizes of the above layer of magnetic material are in the following ranges: height h of the magnetic material layer is at least by two times bigger than thickness d of the coil, and width w of the magnetic material layer is 5-10% of inner radius b of the coil. |
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Multichannel reflecting delay line on surface acoustic waves Multichannel reflecting delay line on surface acoustic waves is made on a substrate of piezoelectric material, having an input transducer, reflecting elements with output contacts connected to an external load. The reflecting elements are in form of interdigital transducers. The input transducer consists of n separate identical interdigital transducers connected in parallel, each forming a separate acoustic channel. Reflecting elements are mounted in each acoustic channel on each side of the interdigital transducer. The reflecting elements in the acoustic channels on each side lie on one line and equidistant from the edges of the substrate. The output contacts of the reflecting elements are connected to a controllable load in form of an inductor, a capacitor or a resistor. The n separate identical interdigital transducers are arranged along a line having an angle of inclination α to the line of reflecting elements. |
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Piezoelectric band-pass filter Piezoelectric band-pass filter includes a first piezoelectric resonator, a first capacitor, a second piezoelectric resonator, first and second inductance coils, as well as second, third, fourth and fifth capacitors, wherein the first inductance coil is connected to the second terminal of the first piezoelectric resonator and the first terminal of the second capacitor; the second terminal of the first inductance coil is connected to a common bus; the second terminal of the second capacitor is connected to the input potential terminal of the filter and the third capacitor, the second terminal of which is connected to the first terminal of the first piezoelectric resonator; the second terminal of the second piezoelectric resonator is connected to the fourth capacitor and the second inductance coil; the second terminal of the fourth capacitor is connected to the common bus; the second terminal of the second inductance coil is connected to the output potential terminal of the filter and the fifth capacitor, the second terminal of which is connected to the first terminal of the second piezoelectric resonator. |
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Transducer with "natural" unidirectional emission of surface acoustic waves Invention relates to electronics and can be used as sensors, resonators, filters, delay lines and in generators. The transducer with "natural" unidirectional emission of surface acoustic waves (SAW) is characterised by that an interdigital structure of electrodes is placed on a piezoelectric crystal substrate which is assembled with interdigital transducers which consist of collectors and teeth, wherein at least two teeth form a transducer cell having at least one system of exciting electrodes for exciting an electric potential wave and at least one system of reflecting electrodes for reflecting electric potential waves; the teeth are mounted vertically in a direction R, which is parallel to the axis of symmetry of the crystal substrate, and the derivative dv/dθ=0 holds for the direction R, where v is the phase velocity of the surface acoustic wave and θ is the angular deviation of the vertical to the direction of a tooth from said direction R. |
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Method of filtering and detecting pulsed signals with robust system of partial channels Method of filtering and detecting pulsed signals with a robust system of partial channels includes observing an additive mixture of pulsed video- or radio signals on a noise background, channel robust and resultant in-phase filtering of pulses, wherein after preliminary one-dimensional functional conversion with corresponding standardisation of the observed additive mixture for the pulsed signal, partial estimates are generated via robust nonlinear filtering in each channel in the robust system of partial channels, then based on said estimates, multidimensional robust processing of output signals of the partial channels is performed using cognitive methods or image identification methods for both video signals and radio signals, while realising coherent and in-phase summation, which is in-phase for signals and not in-phase for noise; detection and estimation of signal parameters is then performed. |
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Rejection LC-filter comprises a low-pass filter which consists of N inductance coils connected in series to each other, wherein each of the leads of said inductance coils is connected to a capacitor and second leads of the capacitors are connected to a common bus. The first lead of the first inductance coil of the low-pass filter is connected to a first circuit consisting of parallel-connected inductance coil and capacitor; the second lead of the last inductance coil of the low-pass filter is connected to a second circuit consisting of parallel-connected inductance coil and capacitor; the second lead of the second circuit is connected to the output potential terminal of the filter. |
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Invention relates to flexible wall for microwave-filters with cavity resonator equipped with mechanical device of temperature compensation to be used in telecommunication. Proposed system comprises at least two separate elastic membranes arranged one above the other. Every said membrane has central area (C), mid area (I) and peripheral area (P), end to end. Note here that elastic membranes are thermally and mechanically bolded at central area (C) and peripheral area (P) and are not connected at mid area (I). |
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Power attenuator comprises N series-connected matched links on identical substrates mounted with equal spacing on a heat-conducting base; each subsequent link, for the same power losses therein, has higher attenuation than the previous link and the power transfer coefficient of the links (KP<1) is a function of at least two parameters, e.g. KPM=f(N, M,…), where N is the number of links; M is the index number of a link (M=1, 2, 3,…, N). The attenuator has a terminal connected to the output of the corresponding link, which corresponds to the parameters: number of links to said terminal and power transfer coefficient from the input to said terminal. |
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Highly selective narrow-band lc-filter Invention pertains to radio electronics and can be used for frequency selection of signals. The highly selective narrow-band LC-filter comprises two structurally identical band-pass filter links, each consisting of three capacitors and an inductance coil, eleven capacitors, two inductance coils, an input and an output potential terminal and a common bus. |
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Invention relates to radio electronics and can be used as a pre-selector of a professional grade radio receiver. The tunable band-pass ARC-filter comprises a first capacitor connected to the input potential terminal of a device, a second capacitor connected to the output potential terminal of the device and two structurally identical general resistance converters, each comprising a first and a second operational amplifier, first, second and third resistors and a third capacitor, second leads of the first and second capacitors of which are connected to a common bus. The device further includes fourth, fifth, sixth, seventh, eighth, ninth and tenth capacitors and two electronic potentiometers. |
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Tunable band-pass LC-filter comprises a band-pass circuit which consists of a first inductance coil, the first terminal of which is connected to a first capacitor, the second terminal of which is connected to a second capacitor, the second terminal of which is connected to a second inductance coil, the second terminal of which is connected to a common bus, and a third, fourth, fifth, sixth, seventh and eight capacitor. |
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Tunable band-pass LC-filter comprises a low-pass filter which consists of first, second and third inductance coils, a first capacitor, a band-pass circuit consisting of a fourth inductance coil, a fifth inductance coil, a sixth inductance coil, a second capacitor which is connected to the output of the band-pass circuit, as well as a seventh and eight inductance coil, first and second varicaps, wherein the seventh inductance coil is connected by one terminal to the input potential terminal, and by the second terminal to a common bus, the eight inductance coil is connected to the output of a low-pass filter, the second terminal of which is connected to the output potential terminal of the device, the first varicap is connected in parallel to the first capacitor, the second varicap is connected in parallel to the second capacitor. |
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Controlled phase changer relates to high and ultrahigh frequencies and can be used to control signal phase in antenna arrays and information transmission systems. The controlled phase changer comprises a dielectric substrate, on one surface of which there is a continuous shielding conductor of a transmission line and on other - interacting metal strip conductors, each connected by one end through a varactor to the shielding conductor of the transmission line, and by the second end to an irregular microstrip transmission line, the ends of which form the input and output of the device. |
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Band-pass lc filter with reflection compensation in stop-band Disclosed device relates to radio electronics and can be used as input selecting circuits of professional-grade radio receivers. The band-pass LC filter with reflection compensation in the stop-band, having multiple cascade-connected links with an identical structure, each having a first inductance coil, the first lead of which is the input of the link, the second lead being connected to a first capacitor, the second lead of which is connected to second and third capacitors, the second lead of the second capacitor is connected to a common bus, the second lead of the third capacitor is connected to a second inductance coil, the second lead of which is the output of the link, wherein the first lead of the first inductance coil of the first link is connected to a fourth capacitor and a third inductance coil, wherein the second lead of a fourth capacitor is connected through a first resistor to the common bus, and the second lead of the third inductance coil is connected through a second resistor to the common bus. |
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Band-pass lc filter with constant input resistance in stop-bands Disclosed device relates to radio electronics and can be used as selectors of professional-grade transceivers. The band-pass LC filter with constant input resistance in stop-bands comprises a first inductance coil, the first lead of which is connected to the input potential terminal of the filter, the second lead of the inductance coil is connected to a first capacitor, the second lead of which is connected to second and third capacitors, the second lead of the third capacitor is connected to a second inductance coil, the second lead of which is connected to fourth and fifth capacitors, the second lead of the fifth capacitor is connected to a third inductance coil, the second lead of which is the potential output of the filter, the second leads of the second and fourth capacitors are connected to a common bus; the device also comprises an additional circuit which consists of a fourth inductance coil, the first lead of which is connected to the input potential terminal of the filter, the fourth inductance coil is connected in parallel to a sixth capacitor, the second lead of the fourth inductance coil is connected to a resistor and a fifth inductance coil, the second lead of which is connected to a seventh capacitor, the second leads of the seventh capacitor and the resistor are connected to the common bus. |
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Method to control phase-shifting device Phase-shifting device is controlled by means of stagewise switching of windings of its shunt transformer by thyristor bridges. For this purpose they measure thyristor bridges and voltage on their switched windings. By measured current and voltage values in the initial condition of the phase-shifting device for each thyristor bridge they fix intervals of the first type, starting from shift in polarity of voltage and ending with shift of current direction, and intervals of the second type, starting from the shift of current direction and ending with shift of polarity of voltage. Intervals of the second type are shortened in the start of the interval - by the value exceeding the time of recovery of the control properties of the thyristor, and in the end of the interval - by the value exceeding the sum of time for recovery of control properties of the thyristor and time of current switching in the winding of the shunt transformer. Duration of shortened intervals is compared with duration of the thyristor switching pulse. Sequence of the permitted intervals is generated from intervals of the first type and shortened intervals of the second type, duration of which exceeds the duration of the thyristor switching pulse. The permitted sequence of the stagewise switching of windings is selected, meeting the specified limitations, in accordance with which they perform switching of the windings in the permitted intervals. |
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Into a device for signal monitoring there are additionally introduced buses of initial voltage and alarm, a threshold element, an analogue key with a control inlet, the third resistor, a diode, the cathode of which is connected with a power supply bus and an inlet of an integrating RC-circuit, the outlet of which is connected to the anode of the diode and the inlet of the threshold element, the outlet of which is connected to the first outlet of the second resistive divider and the control inlet of the analogue key, the inlet of which is connected with the bus of the initial voltage, and the outlet - with the first outlet of the first capacitor, the second outlet of which via the third resistor is connected with the common bus, the bus of the medium value is connected to the first inlet of the second operational amplifier, the outlet of which is connected with the bus of alarm, the second outlet of the second resistive divider is connected either with the power supply bus, or with the common bus. |
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Efficient filtering with complex modulated filter bank Filter generator for providing an intermediate filter definition signal comprises a complex modulated filter bank for filtering an impulse response, determining the amplitude/frequency filter characteristic in a time domain to obtain a plurality of complex valued subband signals as the intermediate filter definition signal, wherein each complex valued subband signal of the complex modulated filter bank corresponds to an impulse response for the intermediate filter for the subband signal, wherein each complex valued subband signal is shorter than the impulse response signal. |
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Frequency-selective device for processing surface acoustic wave signals Frequency-selective device for processing surface acoustic wave signals includes a layered acoustic line made of a phononic crystal in form of an elongated plate, on one wide face of which there is a layer of solid substance with acoustic impedance, different from the material of the acoustic line, and at least two electroacoustic transducers connected to the acoustic line; the phononic crystal plate is formed by an array of separate extended elements arranged in a matrix, wherein the longitudinal axis of said elements matches the width of the plate; the layer of solid substance completely covers the surface of the plate, wherein the input electroacoustic transducer is capable of exciting Love surface acoustic waves in the layer of the solid substance and is placed on the wide face at one end of the plate; the layer of solid substance in the direction of the length of the plate has an area with a variable thickness; receiving electroacoustic transducers are placed at the other wide face of the plate. |
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Selective amplifier has an input signal source, a voltage-to-current converter, an input transistor, an auxiliary voltage source, first and second frequency-setting resistors, first and second balancing capacitors, an additional current mirror and two current-stabilising two-terminal elements. The input signal source is connected to the input of the voltage-to-current converter. The base of the input transistor is connected to the auxiliary voltage source. The output of the voltage-to-current converter is connected to the collector of the input transistor and through the first frequency-setting resistor to the first power supply bus, and is also connected to the input of the additional current mirror. The common emitter output of the additional current mirror is connected to the second power supply bus through the first additional current-stabilising two-terminal element. |
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Selective amplifier has an input voltage source, an additional power supply, a voltage-to-current converter, output and additional transistors, two frequency setting resistors, two current-stabilising two-terminal elements, two balancing capacitors. The output transistor has a collector which is connected through a first frequency setting resistor to a first power supply bus. The output of the voltage-to-current converter is connected to the collector of the output transistor and through series-connected first and second balancing capacitors through alternating current to the common power supply bus. The common node of the first and second balancing capacitors is connected through the second frequency setting resistor to the output of the device and is connected to the emitter of the output transistor. The emitter of the output transistor is connected through the first current-stabilising two-terminal element to the second power supply bus. The base of the output transistor is connected to the emitter of the additional transistor and through the second current-stabilising two-terminal element to the first power supply bus. |
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Invention relates to radio engineering and communication. The precision spectrum limiter has an input voltage source, a first frequency-setting resistor, a first buffer stage, a second buffer stage, a first balancing capacitor, a second frequency-setting resistor, a common power supply bus, a second balancing capacitor, a third frequency-setting resistor, a fourth frequency-setting resistor, a first operational amplifier, having a voltage-to-current converter, a second voltage-to-current converter, a second operational amplifier, having a third voltage-to-current converter and a fourth voltage-to-current converter. |
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Invention relates to radio engineering and can be used as a receiving amplifier of active phased antenna arrays with a built-in test and calibration system, where high sensitivity is required. The balanced microwave amplifier comprises two amplifiers having identical parameters, connected between cascade-connected input and output 3 dB directional couplers; the ballast circuit of the input 3 dB directional coupler comprises a unit for inputting a calibration signal, and each output arm of the output 3 dB directional coupler can be connected through a controlled switch to either the output of the balanced microwave amplifier or to a matched ballast load, wherein the amplifiers with identical parameters have reflection-type power limiters at their inputs. |
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Controlled acoustoelectronic device Method is carried out using an acoustoelectronic device which employs an acoustic line which consists of a monocrystal of a lanthanum-strontium manganite composition La1-xSrxMnO3 (0.12≤x≤0.18) with thermally controlled speed of volume or surface acoustic waves near structural phase transition. The device has an acoustic line having at its ends wideband volume or surface acoustic wave converters, and a thermoelectric temperature controller. |
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Method, system and device for wireless transmission of energy (versions) Disclosed are three versions of a device for wireless transmission of energy, one of which includes: at least one solid-state magnetostrictive resonator in form of a rod; at least one rod made of soft magnetic material placed in the immediate vicinity of said resonator at a distance not greater than its length; at least one converting coil wound around or placed near said resonator or rod made of soft magnetic material at a distance not greater than the length of the resonator or rod, as well as two versions of a method of matching devices for wireless transmission of energy and three versions of a system which is based on using the disclosed methods and includes the disclosed devices. |
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Highly selective tunable lc bandpass filter Highly selective tunable LC bandpass filter has in the longitudinal branch a first capacitor connected to a first inductance coil, second and third inductance coils, a second capacitor and a third inductance coil, fourth, fifth, sixth, seventh and eighth inductance coils, first, second and third signal lines, first and second groups of capacitors; the first signal line is connected to the first group of capacitors; the second lead of each of said capacitors is connected through a corresponding electronic switch to a second signal line; the first leads of the second group of capacitors are connected to a common bus; the second lead of each of said capacitors is connected through a corresponding electronic switch to a third signal line. |
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Highly selective second-order lc bandpass filter Highly selective LC bandpass filter has two inductors and eight capacitors which are connected so as to form two links, the first link providing an attenuation terminal lower than the medium frequency and the second link providing an attenuation terminal higher than the medium frequency. |
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Radio-frequency band-rejection filter includes an input port, an output port, a plurality of acoustic resonators, an inductor for matching impedances of the plurality of acoustic resonators, an inductor for connection in the band-rejection filter among the plurality of acoustic resonators, such that static capacitance between the input port and the inductor is basically equal to the static capacitance between the output port and the inductor. The plurality of acoustic resonators can be a plurality of parallel resonators, a plurality of series resonators or a combination of both. The radio-frequency band-rejection filter is made using a surface acoustic wave technology, a bulk acoustic wave thin-film resonator technology or a bulk acoustic wave resonator technology. |
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Multiband tunable lc bandpass filter Multiband tunable LC bandpass filter has two structure-identical bandpass circuits, each consisting of two inductance coils and three capacitors; the input and output of each of the circuits are connected through electronic switches on both inductance coils to an amplifier, eight signal lines, between which, through corresponding electronic switches, are connected corresponding multiple sections of three inductance coils or three capacitors. |
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Digital conversion method and apparatus, and signal reconfiguration method Method for a digital time-sampled band-pass signal with increase in frequency to the required value includes setting a fixed efficient sampling frequency for digital-to-analogue conversion (DAC), performing complex readjustment of the time-sampled band-pass signal for frequency domain mixing thereof, increasing the sampling frequency N times to obtain a time-sampled signal with a higher sampling frequency, frequency domain representation of which comprises a plurality of signal spectra, filtering to select at least one spectrum, conversion thereof to a continuous signal using DAC, filtering the continuous signal to select the signal spectrum at the required frequency in the frequency domain. The apparatus for digital conversion with increase in frequency of a time-sampled band-pass signal to the required value includes a DAC, a complex tuner, a digital device for increasing sampling frequency N-fold, a signal spectrum filter and a post-DAC filter. |
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Device includes a low-pass filter consisting of N structurally identical links, each link consisting of an inductance coil, the first lead of which is the input of the link, the second lead is the output of the link; each of the leads of the inductance coil is connected to a capacitor; the second leads of the capacitors are connected to a common bus, wherein two loops are further included, each consisting of parallel-connected capacitor and inductance coil; also additionally included are first, second, third and fourth signal lines; the second signal line is connected to a first group of M electronic switches; the second lead of each electronic switch is connected to a capacitor; the second leads of the capacitors are connected to the first signal line, and the third signal line is connected to a second group of M electronic switches; the second lead of each of the electronic switches is connected to a capacitor; the second leads of the capacitors are connected to the fourth signal line. |
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Multichannel frequency dividing selector In the selector, the first lead of the primary winding of a transformer is connected to a first and a second capacitor; the second lead of the first capacitor and the second lead of the primary winding of the transformer are connected to a common bus; the second lead of the second capacitor is connected to the input potential terminal of the selector and the first leads of a third capacitor and a first inductance coil, the second leads of which are connected to the common bus; each lead of the second windings of the transformer is connected to a band-pass filter which consists of a fourth capacitor, the second lead of which is connected to a fifth capacitor and a third inductance coil, the second lead of which is connected to a sixth capacitor, the second lead of which is connected to a seventh capacitor and a fourth inductance coil. |
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Apparatus for frequency-dependent suppression of signals has two signal loops or paths connected directional coupler, wherein the first loop contains a delay element or a duplexer, the second loop contains a band-stop filter, a down-converter, a digital filter and an up-converter. |
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Apparatus for frequency-dependent suppression of signals has two signal loops or paths connected by directional couplers, the first loop having an element such a delay element or a duplexer, the second loop having a band-stop filter, an up-converter, a down-converter, wherein each of said converters has one or more mixers and filters. |
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Surface acoustic wave resonator using reflectors as heating elements Surface acoustic wave resonator using reflectors as heating elements has one or more interdigital transducers and surface acoustic wave reflectors made from short-circuited metal strips, wherein the heating element used is short-circuited reflectors that are partitioned to increase direct current resistance with one or more partitions per reflector. |
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Quartz-crystal resonator has a truncated lens piezoelectric element on which there are exciting electrodes, a film-type resistive heater and a temperature sensor, a base on which there is a piezoelectric element and a transistor heater which is in turn mounted in a housing by a heat-insulating holder; on the end surfaces of the truncated piezoelectric element there are thermoresistive films which are a load for two uncased transistors of output stages of a heat control, placed on top of the thermoresistive films at the centre of the end surfaces of the piezoelectric element. A second heat sensor is mounted on the periphery of the piezoelectric element at a normal to the first heat sensor, and the piezoelectric element itself is mounted in the housing by a heat-insulating holder, the base of which is in form of a plate made from dielectric material with high heat resistance. |
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Method of matching complex impedances and apparatus for realising said method Matching device is connected between a high-frequency signal source and a load, the matching device being made from a four-terminal element, parameters of which are selected based on the condition of ensuring a minimal reflected signal. The four-terminal element is complex and consists of reactive and resistive elements; the output of the high-frequency signal source is connected to the input of the complex four-terminal element; a two-terminal nonlinear element is connected in a longitudinal circuit between the output of the four-terminal element and the load; the nonlinear element is connected to a low-frequency control signal source, wherein the frequency dependency of the element z11 of the array of resistances of the complex four-terminal element is selected using a mathematical expression. |
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SC-section quartz-crystal resonator, made based on the 3-rd mechanical harmonic at frequency of 40-100 MHz, has a quartz plate enclosed between electrodes; geometric dimensions of the quartz plate and the electrodes are defined by given relationships. |
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Radio-frequency identification device operating on surface acoustic waves Identification device operating on surface acoustic waves (SAW) has a transceiving antenna, an interdigital transducer, lying on a piezoelectric plate on which there are also reflectors. A query and processing device is queried through a radio signal; the signal generated by reflectors of the device is processed, wherein encoding of the response signal is determined by the number and position of the reflectors of the device. Encoding of the response signal is determined by combined arrangement of reflectors on both sides of the interdigital transducer. The reflectors are located in mesh nodes in accordance with a code which determines presence or absence of reflectors in a given node, wherein part of the reflectors, in accordance with the phase-shift keying law, is displaced from the mesh nodes by a value equal to a quarter of the wavelength at operating frequency. |
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Active piezoelectric band-stop filter Active piezoelectric band-stop filter has a differential amplifier, two piezoelectric resonators, two resistors and a capacitor. |
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Electronic phase changer has a synchronisation loop, having a reference 1 generator and a driving 1a generator, a phase detector 4, a control device 5, first and second directional couplers 2 and a reference load 3, a tuned generator 16, a second phase detector 4a, a second control device 5a, a phase generator 6 and third and fourth directional couplers 2, which form a phasing loop together with the driving generator; outputs of the driving 1a generator and tuned generator 16 are connected through directional couplers 2 to corresponding inputs of an antenna radiator. |
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Method to match complex resistances and device of its realisation Between a source of a high-frequency signal and a load they connect a matching device, made of a quadripole, parameters of which are selected to provide the minimum of the reflected signal, at the same time the quadripole is made as complex from reactive and resistive elements, a triple non-linear element is introduced, and connected between the output of the complex quadripole and the load according to the scheme with common one of three electrodes, a source of a high-frequency signal is connected to the input of the complex quadripole, the non-linear element is connected to the source of a low-frequency control signal. Dependence of the element z11 of complex quadripole resistance matrix on frequency is chosen using a mathematical expression. |
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Device for remote measurement of atmospheric parameters Device for remote measurement of atmospheric parameters comprises a scanning device and a transponder. The scanning device comprises a driving oscillator 1, a power amplifier 2, a duplexer 3, a transceiving antenna 4, doublers 5, 26 and 27 of the phase, dividers 6, 28 and 29 of the phase into two, narrow-bandwidth filters 7, 19, 21, 30 and 31, a phase detector 8, phasemeters 9, 32 and 33, registration unit 10, multipliers 18 and 20, an adder unit 22, band pass filters 23, 24 and 25. The transponder comprises an acoustic transmission line 11, a microstrip transceiving antenna 12, the electrodes 13.1, 13.2 and 13.3, buses 14.1, 14.2, 14.3, 15.1, 15.2 and 15.3, sensing elements 16.1, 16.2 and 16.3, reflecting gratings 17.1, 17.2 and 17.3, the interdigitated transducer I, II and III. |
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Low delay modulated filter bank Specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is described. The method substantially reduces artifacts due to spectrum aliasing arising from independent modifications of subband signals, for example when using a filter bank as a spectral equaliser. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalisers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems. |
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Acoustic cavity resonator-based resonance structure Resonance structure for wireless transmission or reception of energy includes a conducting frame and a high-Q capacitor which is a meta-capacitor formed by a thin layer of piezoelectric material enclosed between two electrodes, wherein said meta-capacitor lies between two layers of a dielectric substrate, the centre of which is etched, and the conducting frame lies on the top layer of the dielectric substrate. |
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Method to dedicate a useful signal from noise consists in filtration of an input signal in the frequency area, corresponding to the spectrum of the useful signal, in dedication of at least one additional signal from the input signal through filtration, at least in one of frequency areas lying outside the border of the useful signal spectrum, and with the help of the additional signal a signal of noise compensation is generated. The device for dedication of a useful signal from noise comprises a source of an input signal connected to an input of the main filter designed for dedication of a signal in the area of frequencies, which correspond to the spectrum of the useful signal, a unit of additional filters, designed to dedicate additional signals in the areas of frequencies that lie outside the spectrum of the useful signal, a unit of signal processing. |
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Method to increase temperature stability of frequency of a narrow-band acoustic surface wave filter is based on selection of a cut angle of a piezoelectric substrate that is optimal from the point of view of temperature stability of frequency, at the same time at ambient temperature, below which frequency exceeds the permissible level, the substrate is heated by a resistive heater shaped according to a thin-film technology on a dielectric plate and adhered to a piezoelectric substrate, as temperature becomes several degrees higher than the one, at which the heater was switched on, it is switched off, at the same time the heater is switched on and off by means of a switch controlled from signals of a thermal sensor adhered to the piezoelectric substrate. The device comprises a piezoelectric substrate, on which a structure is made from double-mode resonators, and also a resistive heater, a thermal sensor, a switch. |
Another patent 2513024.