HARMONIC FILTER FOR SHORT-WAVE TRANSMITTER Russian patent published in 2016 - IPC H03H7/09 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used in harmonic filters of power amplifiers of wide-band radio transmitters. Harmonic filter for short-wave transmitter comprises N sub-bands, input and output connectors, N low-pass filters (LPF), arranged in one plane and switched at input and output by means of input and output switching elements, between any two LPF frequency-adjacent sub-bands there is the LPF of other sub-band, frequency-remote from both LPF of this pair, wherein the input switching elements are composed in the form of three-contact switches, movable contact of each is connected to the input of the corresponding LFF and simultaneously with the first fixed contact, and the second fixed contact is connected to the input connecting bus.

EFFECT: technical result is higher selectivity and improved matching in the entire operating frequency range of a transmitter.

3 cl, 1 dwg