FIELD: radio engineering, communication.
SUBSTANCE: invention relates to radio engineering. The apparatus for protecting narrowband transmit-receive channels of radio systems, having main and additional antennae connected by a subtracting element, includes N≥1 more main and additional antenna pairs and N≥1 subtracting elements, as well as (N+1) narrowband filters which form (N+1) mutually orthogonal identical arms for the device, each consisting of one main and additional antenna pair and series-connected subtracting element and narrowband filter, wherein all antennae are resonant and identical to each other, the antennae in the main and additional antenna pair are connected to the subtracting element and the filter, made in form of joined sections of a shielded waveguide in which a traveling-wave mode is established; communication of the main and additional antennae with the corresponding waveguide subtracting element in each arm is carried out such that in-phase signals from said antennae excite, in the waveguide, anti-phase transverse antinodes of the waveguide distribution of the electromagnetic field.
EFFECT: higher limit for suppressing pulsed interference power in narrowband transmit-receive channels of radio systems operating in the microwave range, in short-pulse high-power interference exposure conditions when conducting electromagnetic compatibility tests.
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