S H F FILTER Russian patent published in 1995 - IPC

FIELD: SHF equipment. SUBSTANCE: SHF filter includes magnetized gyromagnetic resonators 5, 9, 13 each embraced by pair of orthogonal turn coupling elements 2 and 4, 6 and 8, 10 and 12. Proper p-i-n diode 3, 11, 7 is linked to each pair. With supply of controlling voltage of positive polarity to p-i-n diodes leads of orthogonal turn elements are short-circuited to ground and band-pass mode of operation of SHF filter is realized. Provision for operation under band-suppression mode in addition is achieved with supply of controlling voltage of negative polarity (or zero one) when each p-i-n diode presents capacitance and forms together with proper pair of orthogonal turns of coupling elements a link of low-pass filter which cut-off frequency is higher than upper frequency of range of retuning of SHF filter. EFFECT: provision for operation under band-suppression mode. 2 cl, 2 dwg