TUNABLE FILTER OF HARMONICS OF A RADIO TRANSMITTER Russian patent published in 2019 - IPC H03H9/00 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to harmonic filters of power amplifiers of wide-range radio transmitters. Tunable filter of harmonics of radio transmitter contains N medium inductance coils, where N is number of frequency subranges, N input and N output L-shaped links and N first and N second three-contact switches, wherein in each of N input and N output L-shaped links there is an additional capacitor of constant capacity, connected between the second output of the inductance coil of the transverse arm and the common bus, wherein the point of connection of the inductance coil of the transverse arm and the additional capacitor of constant capacitance is connected to the movable contact of one of the corresponding first and second three-contact switches.

EFFECT: reduced level of harmonic components of the transmitted signal at the output of the harmonic filter with simultaneous simplification of the device.

1 cl, 1 dwg