HARMONIC FILTER OF SHORTWAVE TRANSMITTER Russian patent published in 2018 - IPC H03H9/00 

FIELD: radio engineering, communication.

SUBSTANCE: harmonic filter of shortwave transmitter contains N input and output switchable by input and output switches of LC-filters, each of which contains the first and second inductors in the longitudinal arms connected to each other and linked to each other by an inductive coupling, and a parallel oscillating LC-circuit is contained in the transverse branch, each capacitor of variable capacitance, common to all LC-filters, is designed as a set of capacitors switched by the control device, in addition, to each LC-filter input and output low-pass filters are introduced.

EFFECT: reduction of the level of harmonic components of the transmitted signal while ensuring harmonization of the harmonic filter in the entire operating range of the radio transmitter frequencies.

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