DEVICE FOR SELECTION AND CONVERSION OF FREQUENCY OF MODULATED RADIO SIGNALS Russian patent published in 2013 - IPC H03D7/00 

FIELD: radio engineering.

SUBSTANCE: device consists of double-wire line (DWL) (1), to the input of which a modulated radio signal U_c(ω_r,Ω_c) is supplied, as well as double-wire line (DWL) (2), to the input of which a signal is supplied from generator of modulated vibrations U_r(ω_r,Ω_r), the load-carrying frequency of which coincides with the carrier frequency of modulated radio signal (ω_r=ω_c), and modulation frequency Ω_r is higher than modulation frequency Ω_c of radio signal. DWL (1), DWL (2) are loaded separately for resistance R equal to wave resistance of the line, and oriented towards each other in the direction of waves running to them. Between wires of DWL (1), DWL (2) and parallel to them there arranged is wire (W) (3) that is connected to band-pass filter (BPF) (4) tuned for modulation frequency Ω_r of generator vibrations. At that, length of DWL (1), DWL (2) and length of W (3) have been chosen not less than one tenth of the wave length of the modulated radio signal.

EFFECT: possibility of selecting and converting the frequency of radio signals of various kind of modulation in one device without any auxiliary conversion channels.

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