FIELD: concurrent serviceability check of ring antenna channels phased out by using method of ring harmonics. SUBSTANCE: ring antenna has first microwave switch, first pattern-forming matrix whose inputs are connected to antenna array radiators, fixed phase shifters, as many as there are radiators, second pattern- forming matrix whose inputs are coupled with outputs of fixed phase shifters and outputs, with respective inputs of first microwave switch, its output being used as output of antenna array with serviceability check-up system incorporating check- signal generator; in addition, it is provided with spectrum analyzer, second microwave switch, and directional couplers, as many as there are radiators, whose inputs are connected to outputs of first pattern-forming matrix, first outputs are connected to inputs of fixed phase shifters and second outputs, to respective inputs of second microwave switch which is connected to spectrum analyzer input. Second microwave switch periodically connects outputs of directional couplers to spectrum analyzer input thus modulating radiator signal phases obeying linear law at rate proportional to radiator number causing different mixing of their frequencies. EFFECT: provision for separate viewing of signals on spectrum analyzer screen. 3 dwg
