M-CHANNEL FREQUENCY-SELECTIVE DEVICE Russian patent published in 2020 - IPC H04B1/06 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio communication and can be used in radio receivers of decametre wavelength range, namely to M-channel frequency-selective device. Device comprises a common bus and an input potential terminal, as well as a frequency-selective system comprising M channels. Each channel comprises first and second input terminals, a common bus, an input oscillating circuit comprising parallel connected input variable capacitance element and an inductance coil, provided with a communication winding, which outputs are connected to input terminals, respectively, first output of oscillatory circuit is connected to common bus, second output of oscillatory circuit is connected to first terminals of first and second two-terminal network made in form of capacitors, second outputs of which are connected to the first and second inputs of the operational amplifier, the output of which is connected to the output potential terminal of the channel, the input capacitive element is made in the form of a capacitor and a varicap connected in series. At first channel first input terminal is connected to input potential terminal of device, second input terminal is connected to first input terminal of second channel, in which second input terminal is connected to first input terminal of next channel, and so forth, second input terminal M channel is connected to common bus.

EFFECT: technical result is the possibility of operation of the disclosed device as a channel two-link tunable bandpass filter having a second class of characteristic resistance and a first class of characteristic attenuation.

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