FIELD: radio engineering, communication.
SUBSTANCE: apparatus for frequency-dependent suppression of signals has two signal loops or paths connected directional coupler, wherein the first loop contains a delay element or a duplexer, the second loop contains a band-stop filter, a down-converter, a digital filter and an up-converter.
EFFECT: multiple filtration of radio-frequency signals with setting frequency hopping where at the filter input there is a wide dynamic range between signals in the attenuation band and the pass band.
23 cl, 11 dwg
