M-CHANNEL FREQUENCY-SELECTIVE DEVICE Russian patent published in 2019 - IPC H04B1/18 

FIELD: radio equipment and communications.

SUBSTANCE: invention relates to the radio communication, and can be used in the decameter wave band radio receivers. M-channel frequency selective device has a common bus, an input potential terminal to which the input broadband filter input is connected, an amplifying element, a group comprising M output narrow-band filters. Input broadband filter includes inputs of input differential amplifier, in which to first output is connected first subgroup containing M / 2 output tunable filters with odd serial numbers, and to second output is connected second subgroup containing M / 2 output filters with even serial numbers, in each group, inputs of all filters are connected in series, output of each output tunable filter is simultaneously output of device. Input broadband filter having a large steep characteristic in the transition regions comprises a common bus and an input potential terminal connected to the input potential terminal of the frequency selective device, to which is connected first input of input coupling coil of inductance coil, in which first output is connected to first outputs of first capacitor, as well as first and second two-terminal devices, second leads of the communication winding, the input inductance coil and the first capacitor are connected to the common bus, the second outputs of the first and second two-terminal devices are connected to the first and second inputs of the input differential amplifier, respectively, first and second dipoles contain parallel connected capacitor and two two-terminal devices, each of which is made in the form of series-connected inductance coil and capacitor.

EFFECT: improved functional and technical capabilities, namely obtaining of M channels with increased level of attenuation in stopping bands at each channel.

1 cl, 8 dwg