Antenna grid of elliptic polarization

FIELD: radio engineering, communication.

SUBSTANCE: antenna contains four identical symmetrical vibrators mounted on the mast support and tilted at the same angle with respect to the plane. Each symmetrical vibrator contains a radiator, a balun device and a coaxial cable. The emitter is made of two identical coaxial conductors, between which there is a gap. The symmetrical device is made in the form of a short-circuited two-wire line and includes two identical parallel conductors that are connected on one side to the conductors of the radiator in the gap, and on the other side are combined by a shorting third conductor that is connected to the mast. The coaxial cable is connected by its external conductor to one of the conductors of the radiator in the gap, and its internal conductor is connected to the second conductor of the radiator in the gap. An additional L-shaped conductor is inserted into each symmetrical vibrator, which is located between the parallel conductors of the two-wire line. The long arm of the additional L-shaped conductor is oriented along the two-wire line. Between the one end of the long arm of the additional L-shaped conductor and the short-circuiting conductor of the two-wire line there is a gap. The second end of the long arm of the additional L-shaped conductor is connected to one of the parallel conductors of the two-wire line by means of a short arm of an additional L-shaped conductor.

EFFECT: achievement of a small level of oscillations in the antenna pattern of the antenna array with elliptical polarization in the horizontal plane while providing a low level of the standing wave coefficient for the voltage at the antenna input.

4 dwg

 



 

Same patents:

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to phased antenna arrays. An optical phased antenna array comprises a bundle of optical fibres, the ends of which, on one hand, make up the plane of the phased antenna array and, on the other hand, make up an optical radiation receiving-transmitting plane, a matching optical system for uniform distribution of optical radiation from a laser across the entire receiving-transmitting plane of the bundle of optical fibres; each fibre is insulated from the coatings of other fibres; one of the "capacitor" coatings is in contact with the corresponding element on current-conducting rubber, which is connected to the corresponding contact at a "lower" plate, and the other is in contact with a common bus through current-conducting rubber, where there is a common contact for all "upper" coatings of the "capacitors". Such one-dimensional arrays are gathered one over the other to form a matrix. The optical radiation phase is controlled through the "lower" plates by a system for controlling, synchronising and processing information through digital-to-analogue converters.

EFFECT: wider range of equipment for realising an optical phased antenna array.

2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to microwave phased antenna arrays and can be used in passive and active radar for continuous concurrent surveillance of space. A multibeam microwave linear antenna array includes N transceiving modules, each having an antenna element, an amplifier with microwave switches, a microwave divider and a beam-forming device. A two-dimensional antenna array comprises P linear multibeam microwave antenna arrays. Each linear array is a row, wherein each M board of elementary adders further includes a microwave divider on K channels, connected to the output of a monolithic amplifier. Outputs of the channels of dividers of each board in each row are shifted by a step equal to L/M, where L is the length of the board. Outputs of the row are connected by vertical columns, which are beam-forming devices. The total number of outputs of the boards of the columns in receiving mode is equal to M×K, where each output matches its own beam in space. In transmission mode, outputs of K board of M columns are converted to inputs of channels (beams) emitted by the active phased antenna array.

EFFECT: enabling formation of an existing fan of narrow beams, covering the entire monitored solid angle by both a one-dimensional and a two-dimensional antenna array.

2 cl, 7 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and can be used in radio electronic transmitting and receiving devices of different purpose. An ultra-broadband scanning phased antenna array (PAA) consisting of a set of emitting elements, in which an aperture is formed by multilevel horn-type radiators, each of which has linear dimensions that are bigger than wave length and a controlled directivity pattern adjusted by means of a control element.

EFFECT: simpler electronic array structure.

3 cl, 5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in radars, communication systems and other devices that use strong pulse sequences. The device described contains scanning multifrequency antenna array (1), which consists of radiant units, isotropic in scanning plane, receiving antenna array (2), consisting of waveguide horns. Horns of the antenna are located inside of oversize waveguide (6) in angle sector of 360°, delay lines (3), phase shifters (4) and transmitting antenna array (5).

EFFECT: higher pulse power of radiated signals.

5 dwg, 1 tbl

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering, in particular, to antenna equipment, and can be used in various radar stations, radio communication stations that use two distant frequency ranges, for instance, S- and -M-bands. The Fresnel reflector antenna contains a primary feed element 1, that forms spherical electromagnetic waves of two distant frequency ranges, a zone surface 2, formed by a set of non-transparent circular zones 7, 9, 11, 13, 15, semi-transparent circular zones 8, 10, 12, 14, 16, 17, 19, 21 and transparent circular zones 18, 20, 22. The total number of zones is equal to the number of circular zones for the maximum operating frequency. The said surface is located at the side of a dielectric layer 3, exposed to the electromagnetic wave radiated by the feed element 1. On the other side of the dielectric layer 3 a semi-transparent grid 4 is located, which consists of conductors, set in parallel. The antenna also contains the second dielectric layer 5, located between the grid 4 and a metallic screen 6.

EFFECT: expansion of the antenna functionality due to the operation in two distant frequency ranges with one radiating opening, and provision of the radiating pattern characteristics, close to the maximum ones in both frequency ranges.

5 dwg

FIELD: physics, navigation.

SUBSTANCE: invention relates to radar and specifically to broadband antenna systems, the operating frequency range of which overlaps a few octaves. The broadband antenna system comprises a combined monopulse Cassegrain antenna excited by a phased antenna array, operating in the high-frequency range, which includes an annular antenna array of K log periodic dipole antennae and a broadband receiver, wherein the log periodic dipole antennae are located between a parabolic cylinder and a plane which is orthogonal to the longitudinal axis of the antenna and passes through the axis of rotation of a twist reflector, oriented parallel to the axis of the antenna system in the aircraft fight direction and lying in a plane at a tangent to the surface of the cylinder which bounds cross dimensions of the antenna system; elements of the log periodic dipole antennae are in the form of strip conductors located on two sides of a flat dielectric plate.

EFFECT: wider operating frequency range of a combined antenna system operating in active and passive modes.

3 dwg

FIELD: radio engineering, communication.

SUBSTANCE: in a polymer-coated sonar phased antenna array, having piezoelectric elements mounted on a flat base in a housing and having an outer sealing layer on the side of the working surface thereof, made of sound-transparent polyurethane, between the outer sealing layer and the working surface of the piezoelectric elements there is an additional composite sound-transparent coating made of a urethane sealant, having shear losses, the Q-factor of an oscillatory system consisting of a piezoelectric element and an additional sound-transparent layer decreases, thereby expanding the bandwidth. The value of the bandwidth is controlled by the thickness of the layer of urethane sealant, the value of which ranges from λg/8 to λg/4, where λg is the sound wavelength in the sealant material. The outer sealing layer is adhesively bonded to the additional composite sound-transparent coating and the housing.

EFFECT: manufacturable sonar phased antenna array with a given transducer bandwidth and a longer service life.

2 cl, 1 dwg

FIELD: physics, communications.

SUBSTANCE: invention relates to antenna engineering and is intended to receive radio-frequency signals in radio communication, mobile communication, radar and radio astronomy. The signal-to-noise ratio optimisation method includes switching input impedance, which is presented to a matching circuit in each receiving channel, to a complex conjugated optimum impedance of the corresponding low-noise amplifier; receiving radio-frequency signals through receiving antennae; generating a superimposed signal from the received radio-frequency signals; modifying the matching circuits of all receiving channels in order to find the optimum matching condition based on the superimposed signals; switching the input impedance in each receiving channel back to a value for normal operation of the system. The system comprises an array of two or more receiving antennae for receiving radio-frequency signals, matching circuits, low-noise amplifiers which present the input impedance to corresponding matching circuits which convert optimum impedances of the low-noise amplifiers, wherein the optimum impedances provide an optimum noise characteristic for the low-noise amplifiers.

EFFECT: high sensitivity of receiving radio-frequency signals.

9 cl, 4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio electronics. The multichannel radio monitoring device comprises an antenna array consisting of N antennae, outputs of which are connected in series to N analogue receiving units, N analogue-to-digital converters (ADC) and N DDC, as well as k controlled-delay data storage units. The present invention comprises the following steps: first, preliminary processing of a wideband signal through frequency decomposition thereof using full reconstruction analysis filter banks, reducing redundancy and storage during a required time for delayed access; second, picking up narrow-band signals by reading from the controlled-delay data storage units of the required frequency-time fragment of the wideband signal, decompression thereof in data decompression units; reconstructing, using synthesis filter banks, space-time processing in space-time signal processing units and transmitting signals to the user via interfaces with client signal processing means for end processing thereof.

EFFECT: providing access to narrow-band signals in delayed mode and increase in number of concurrently operating receiving channels.

4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to a reflector array for a reflector array antenna. The reflector array comprises a plurality of elementary radiating elements forming a reflecting surface with no abrupt transitions, wherein each radiating element of the reflecting surface is selected from a set of predetermined consecutive radiating elements, called the pattern, the first (1) and last (9) elements of the pattern correspond to one phase, modulo 360°, and are identical, and the radiating elements (1, 2, 3, 4, 5, 6, 7, 8, 9) of the pattern have a radiating structure of metal patch type and/or of radiating aperture type, that gradually changes from one radiating element to another adjacent radiating element, the change in the radiating structure comprising a succession of gradual growths of at least one metal patch (25) and/or at least one aperture (27) and appearances of at least one metal patch (25) in an aperture (27) and/or at least one aperture (27) in a metal patch (25).

EFFECT: eliminating diffraction.

15 cl, 13 dwg

FIELD: radio engineering; microwave feedthrough antenna arrays using electrical beam scanning; various radars.

SUBSTANCE: proposed feedthrough antenna system has coaxially mounted reflector, horn-type microwave feed, and feedthrough phased antenna array. Device of first design alternate has its horn-type microwave feed disposed between feedthrough phased antenna array and reflector made in the form of parabolic mirror with polarizer, diameter of parabolic mirror being equal to (1.0 - 1`.2) of maximal linear dimensions of feedthrough phased antenna array, as viewed on top. Device of second design alternate has its reflector made in the form of flat mirror with polarizer free to turn about spherical hinge disposed at supporting point in symmetry center of flat mirror and on common axis of antenna system; its horn-type microwave feed is disposed between feedthrough phased antenna array and flat mirror and is mounted beyond this array aperture so that its longitudinal axis crosses flat mirror supporting point, feedthrough phased antenna array and flat mirror being equally shaped, as viewed on top, and linear dimensions of flat mirror being equal to (0.7 - 0.8) of respective linear dimensions of mentioned feedthrough array.

EFFECT: enlarged functional capabilities due to enlarged angular beam scanning sector.

13 cl, 6 dwg

FIELD: microwave engineering; slotted waveguide antenna arrays for radar systems of flying vehicles.

SUBSTANCE: proposed low-silhouette slotted waveguide antenna array enabling use of group method for manufacturing its components is, essentially, multilayer waveguide system that has radiating antenna array divided into a number of subarrays and power distribution circuit. Radiating elements of slotted waveguide antenna array are longitudinal slots in wide walls of waveguides. Multilayer waveguide system is, essentially, multilayer structure assembled of alternating interconnected thin conducting plates and conducting bases, the latter being provided with through holes forming waveguide channels, and plates forming wide walls of waveguides are provided with through holes of radiating or coupling elements, or power supply elements.

EFFECT: facilitated manufacture, enhanced manufacturing and assembling precision, strength, and yield.

8 cl, 10 dwg

Combined antenna // 2247449

FIELD: radio engineering.

SUBSTANCE: proposed antenna has two oscillating systems where concentrations of different kinds of energy (electrical and magnetic ones) are combined or brought together as close as possible. Vertical biconical member used as main oscillating system has its cones made in the form of arrays of thin rods of approximately quarter-wavelength. Magnetic field with azimuthal lines of force is concentrated about power conductor in gap between slightly separated cone vortices. Meridian electric field built up by varying this field is unidirectional with meridian arcs of additional oscillating system which is, essentially, electric dipole whose axis is aligned with that of biconical member. Lower ends of arcs are joined with bottom vortex of cone (grounded) and upper ones run between top cone rods and are joined into node disposed above its vortex on symmetry axis. Upper end of additional electric dipole terminates in short rod directed upward from node along axis. Main and additional electric radiating dipoles are tuned to approximately same resonant frequency and coupling between them chosen to exceed critical value affords double-cavity (W-shaped) curve of standing wave ratio as function of frequency. Double-frequency antenna can be built with dipole-to-dipole coupling greater than critical value.

EFFECT: essentially enlarged frequency band.

1 cl, 2 dwg

FIELD: radar systems working on basis of onboard radars in mode of real beam at electronic scanning.

SUBSTANCE: proposed method consists in forming matrix of radar image of surface in mode of real beam at electronic scanning at abrupt change-over (shift) of radar beam in azimuth by "n" part of directional pattern width and processing of amplitudes of reflected signals at each position of beam; amplitudes of reflected signals at output of radar total channel y1, y2…,yn obtained at "n" first positions of radar beam in "i" range resolution element are summed-up with weights h1, h2,..,hn and amplitude χn of reflected beam corresponding to "n" part of antenna directional pattern at first position of beam is estimated: besides that, during subsequent shifts of beam by "n" part of antenna directional pattern of amplitude of reflected signals obtained at subsequent positions of beam is summed-up with the same weights and parameters. χn+1, χn+2,…, χN;

Then, estimations A(ij)= χ^j of amplitudes χj(j=n, n+1,…,N) found independently in each "i" (i=1,2…,m) range resolution element are arranged in "m" lines and N-n+1 columns, thus forming matrix of radar image of surface .

EFFECT: increased resolving power (narrowing of antenna directivity) in azimuth at simultaneous widening of radar observation zone.

FIELD: cellular mobile system of data transmission.

SUBSTANCE: an arbitrary formation of the directional pattern of the antenna array may be accomplished by adjustment of parameter W(n) of formation of the directional pattern for n elements of the antenna on the basis of the difference in the size and shape between the required zone of servicing obtained on the basis of the engineering analysis, and a relay realized zone of servicing. Setting of accuracy W(n), i.e. the length of the pitch of adjustment, setting of the set of underlying data W0(n), original value of mean-square error ε0, setting of the count variable, setting of the threshold value of M of the end of adjustment and the maximum power T (n') of radiation of the antenna element. The cycle of adjustment of W(n) is carried out with these settings. The method for pitch-by-pitch approximation is used for adjustment of the parameters of antenna radiation on the basis of the orientation of the minimum mean-square error.

EFFECT: accelerated determination of the optimum value of radiated power for each antenna element in the preset limits for attainment of the effect of local optimization with the use of the criterion of the minimum means-square error.

19 cl, 10 dwg

FIELD: radio engineering including antenna engineering.

SUBSTANCE: proposed antenna array that can be used in antenna communication and radar facilities for electrical scanning primarily in superhigh and extremely-high frequency bands has waveguide radiators with nonoverlapping apertures of high- and low-frequency bands disposed in one aperture and affording frequency-selective isolation between apertures of high- and low-frequency bands. Novelty in antenna array is use of low-frequency band radiators made in the form of diaphragmatic periodic waveguides provided with cutoff band for waves propagating in operating frequency band of high-frequency band radiators.

EFFECT: simplified design, extended frequency band affording frequency-selective isolation between apertures.

1 cl, 6 dwg

FIELD: antenna engineering; television, communications and radar engineering.

SUBSTANCE: proposed self-phasing antenna array that constitutes n-channel device has in each channel antenna array radiator, mixer, phase-locked loop, standard generator, and adder; newly introduced in each channel of antenna array are power splitter, matched filter, first detector, and difference device.

EFFECT: enhanced quality of reception due to improved signal-to-noise ratio.

1 cl, 1 dwg

FIELD: radio engineering, applicable in radio detection and ranging, in communication systems and other devices in which sequences of radio pulses are used.

SUBSTANCE: the multifrequency antenna array formation of a sequence of pulse signals in space has a system for formation of a coherent frequency spectrum, radiating elements, controlled phase shifters, control system of phase shifters, signals with different frequencies are distributed among the array radiating elements according to the accidental law.

EFFECT: spatial formation of pulse signal and provision of a wide-angle electronic scanning of the radiation pattern according to the preset law.

5 dwg

FIELD: radio communications and microwave engineering; data transfer and reception dispensing with line carrier-signal source.

SUBSTANCE: controlled discontinuity made in the form of flat laminated medium incorporating first uncontrolled grating, first insulating layer, second uncontrolled grating, second insulating layer, controlled layer in the form of two-dimensional periodic grating of conducting components (strips and rods) with controlled components inserted in series with them is characterized in that any passive components having nonlinear characteristics are chosen as controlled components; connected to controlled components are two primary-signal sources with respective subcarriers and two recording devices. Geometric parameters of first and second gratings are chosen so as to ensure desired values of ether conductivity B11 of first uncontrolled grating and conductivity B12 of second uncontrolled grating at echo-signal frequency f1 or conductivities B12, B22 at transmitted-signal frequency f2. Mathematical formulas for finding these values are given in description of invention. Thickness d1 of first insulating layer is chosen from following condition: 0 < d1 ≤ λ/4n1; refractive indices of first and second insulating layers n1 and n2, respectively, are chosen from following expressions: 1 ≤ n1 ≤ 10; 1 ≤ n2 ≤ 10.

EFFECT: reduced mass and size of device.

1 cl, 8 dwg

FIELD: data reception and processing in noise environment, for instance, in radar location.

SUBSTANCE: proposed adaptive antenna array that functions to compensate for results of scanning has N array antennas, items of weighting coefficients, adaptive processor, and adder; in addition, it has newly introduced N x D items of weighting coefficients compensating for results of scanning directivity pattern, where G is quantity of probable noise sources.

EFFECT: enhanced efficiency of spatial noise suppression.

1 cl, 7 dwg

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