RADIO TRANSMITTER ADJUSTABLE HARMONIC FILTER Russian patent published in 2019 - IPC H03H7/00 H03H9/00 

FIELD: radio equipment.

SUBSTANCE: invention relates to the field of radio equipment, and can be used in the wide-band radio transmitters power amplifiers harmonic filters. In its middle part the radio transmitter harmonics adjustable filter contains N middle inductance coils, where N is the number of frequency subranges, the first adjustable capacitor, connected to the each middle inductance coil first output by means of one of the N first switches, the second adjustable capacitor connected to the each middle inductance coil second output by one of the N second switches, N input L-shaped links, each of which consists of two inductance coils, which connection point is connected to the corresponding middle inductance coil first output, and N output L-shaped links, each of which consists of two inductance coils, which connection point is connected to the corresponding inductance middle coil second output, at that, each of the input L-shaped link input is connected to the harmonic filter input connector through the corresponding input switch, and each of the output L-shaped link output is connected to the harmonic filter output connector through the corresponding output switch, at that, the N first additional capacitors are additionally introduced, each of which is connected between the corresponding middle inductance coil first output and common bus, and N second additional capacitors, each of which is connected between the corresponding middle inductance coil second output and the common bus, at that, in parallel to each of the first and second additional capacitors one of 2N additional switches is connected.

EFFECT: technical result consists in expansion of the radio transmitter adjustable harmonics filter operational capabilities with simultaneous reduction in the transmitted signal harmonic components level.

1 cl, 1 dwg