SHORT WAVE TRANSMITTER HARMONIC FILTER Russian patent published in 2017 - IPC H03H7/00 

FIELD: radio engineering, communication.

SUBSTANCE: short-wave transmitter harmonics filter (HF) contains N frequency divider devices (FDDs), where N is the number of frequency subbands, each of which consists of a low-pass filter (LPF), a high-pass filter (HPF) connected at the input in parallel and which form the input of the FDD, and the ballast resistance connected to the output of the HPF. Each input of the FDD is connected to the input of the HF through the input three-contact switch, in each FDD the low-potential terminals of the capacitors of two adjacent transverse arms of the LPF are connected to each other and connected to the common bus through an additional inductor. The output of the LPF is connected to the output of the HF via the output three-contact switch.

EFFECT: decreasing the level of harmonic components of the transmitted signal, starting with the third harmonic.

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