Tunable band filter

FIELD: radio engineering.

SUBSTANCE: tunable band filter comprises N+1 inductances, which are connected serially, according capacitance and inductance, the second outputs of which are connected to common bus, to each of neighbouring inductances connection points. This chain creates band filter, which consists of N cascade connected links, input of specified band filter via the first inductance is connected to input potential terminal of device, output of this band filter is connected via the second inductance to outlet potential terminal of device, points of connection of neighbouring inductances, which are included into longitudinal branches of specified N link band filter, and also points for connection of the first and second inductances with this band filter produce N+2 intermediate outputs of device and are connected accordingly to N+2 inputs of commutator additionally introduced in device, M outputs of which are connected to capacitance box, comprising M capacitors, the first outputs of which are connected to M outputs of commutator, and the second outputs are connected to common bus.

EFFECT: expansion of functional resources.

1 dwg

 

The present invention relates to electronics and can be used for frequency selection signals to receiving devices.

Known bandpass filter containing N+1 coil inductances connected in series. A connection point connected inductances in the circuits are connected through the respective parallel paths to the shared bus. This chain forms a band-pass filter consisting of N cascaded included four links [1].

The disadvantage of this filter is that it is made on a given Central frequency and cannot be used as a tunable filter.

The objective of the invention is to derive some discretely tunable bandpass filter.

The problem is solved due to the fact that the device introduces additional first and second inductors. The first of them is connected between the input potential of the terminal device and the input of the bandpass filter, a second inductor connected between the output of this filter and the output potential terminal device.

In addition, the device additionally introduced switch having N+2 inputs and M outputs and store capacitors, and the inputs of the switch are connected with the intermediate outputs of the device, which is connected to stockum connection of the first and second additional inductances with input and output bandpass filter, and the connection points of the adjacent inductances included in the serial branch of the bandpass filter. The output terminals of the switch are connected to inputs of the store capacitors containing M capacitors connected to the output terminals of the switch, and the second terminals of the capacitors connected to a common bus.

Comparative analysis shows that the claimed technical solution differs from the prototype in that the device additionally introduced the first and the second inductor connecting the input and output bandpass filter with an input and an output potential terminal, and a switch having N+2 inputs and M outputs and store capacitors. Moreover, N+2 input switch is connected to N+2 intermediate outputs of the device, which is formed by the connection points of the neighboring series-connected inductances connecting input and output devices, and M outputs of the switch is connected to the store capacitors.

When comparing the proposed solutions not only prototype, but with the known technical solutions in science and technology not found solutions with similar characteristics.

The drawing shows an electric diagram of the device. The device consists of a chain of series-connected inductors, the number of which is s equal to N+1, to each connection point adjacent inductances of the circuit connected to the corresponding capacitor and the corresponding inductor, the latter findings are connected to a common bus. Such combination of these elements forms a N-tier band-pass filter 1. Added first (2) and second (3) coil inductance included respectively in the input and output of the bandpass filter 1. Added switch (4) contains N+2 inputs, connected respectively with N+2 intermediate outputs of the device, and its M outputs connected to the M inputs of the store capacitors (5)containing a group of capacitors, divided into N+2 groups connected to the intermediate inputs of the device through the switch (4).

The device operates as follows.

At a certain position key switch separate capacitors located in the store capacitors, or their group are connected to the intermediate inputs of the device. In this case, the device is N cascade included band-pass filters on the input and output of this circuit is enabled polozenie low-pass filters (LPF). The element values are chosen so that the characteristic impedance of the band pass filter at the input and the output is Z2a load device at the input and the output is Z1. Typically, Z2>Z1. In this is case, the parameters of the LPF can be chosen so as what is the frequency of the band pass filter input impedance of the first low-pass filter (located at the entrance) will be equal to Z1a output characteristic at this frequency will be equal to Z2. This will ensure the coordination of a bandpass filter with a load impedance of the device. With decreasing values of capacitors connected in parallel to the transverse branches of the bandpass filter, the tuning frequency of the filter will increase, at the same time will increase its input and output characteristic impedance. If simultaneously with this restructuring to change the values of the capacitors of the first and second low-pass filter, it is possible to find the ratio of these low-pass filter with unchanged values of the first and second inductances so that will remain coordination rebuilt bandpass filter with a load impedance of the device.

Calculated and experimentally obtained that the restructuring of this filter in a fairly wide range (for example from 5 to 30 MHz) is possible with constant absolute bandwidth and with a minor adjustment of the values of capacitor low-pass filter, and possible restructuring of the filter in this range of frequencies while maintaining a constant relative bandwidth. In this case, requires a large range of parameters values of the capacitors included in I is underwater and the output low-pass filter.

Sources of information

1. Barefoot N Electric filters. Gostekhizdat USSR, 1957, str, RES.

Tunable bandpass filter containing N+1 inductances connected in series, each of the connection points of the adjacent inductances connected to the respective capacitance and inductance, the latter findings are connected to a common bus, this circuit forms a band-pass filter consisting of N cascading links, characterized in that the input referred bandpass filter through the first inductance is connected to the input potential of the terminal device, the output of this bandpass filter is connected via the second inductor output potential terminal device, the connection points of the adjacent inductances included in the longitudinal branch of the mentioned N tier bandpass filter, and a connection point of the first and second inductances with this band-pass filter to form N+2 intermediate output device and connected respectively to N+2 inputs additionally introduced into the device switch, M outputs of which are connected to the store tanks containing M capacitors, the first conclusions of which is connected to the M outputs of the switch, and the second terminals are connected with a common bus.



 

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FIELD: radio engineering, possible use in radiolocation stations working with two multi-frequency generators.

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FIELD: radio engineering.

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