HARMONIC FILTER OF SHORT-WAVE TRANSMITTER Russian patent published in 2015 - IPC H03H9/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in harmonic filters of power amplifiers of short-wave radio transmitters. The harmonic filter of a short-wave transmitter comprises in its middle part N middle inductance coils, where N is the number of frequency subbands, a first variable capacitor connected to the first terminal of each middle inductance coil through one of N first switches, and a second variable capacitor connected to the second terminal of each middle inductance coil through one of N second switches, N input inverted L-shaped links, each consisting of two inductance coils, the connection point of which is connected to the first terminal of the corresponding middle inductance coil, and N output inverted L-shaped links, each consisting of two inductance coils, the connection point of which is connected to the second terminal of the corresponding middle inductance coil, input switches and output switches.

EFFECT: matching a harmonic filter in the entire operating frequency range of a radio transmitter and a high transmission coefficient while reducing the level of harmonic components of the transmitted signal.

2 cl, 1 dwg