the invention can be used in frequency selective u0446u0435u043fu00a0u0445 tract microwave. the purpose of u0438u0437u043eu0431u0440u0435u0442u0435u043du0438u00a0 - increase in the u0437u0430u0442u0443u0445u0430u043du0438u00a0 u0437u0430u0433u0440u0430u0436u0434u0435u043du0438u00a0 in u0440u0430u0441u0441u0442u0440u043eu0439u043au0435 toward lower frequencies. tunable comb band passing filter contains three or more resonator 1 and the element 2 u0441u0432u00a0u0437u0438 between u0434u0432u0443u043cu00a0 u043du0435u0441u043cu0435u0436u043du044bu043cu0438 u0440u0435u0437u043eu043du0430u0442u043eu0440u0430u043cu0438, which u0432u044bu043fu043eu043bu043d and in the form of transmission line.while achieving high frequency signals received from the first resonator 1 in the last two u043fu0443u0442u00a0u043c going on their u043au043eu043cu043fu0435u043du0441u0430u0446u0438u00a0 with negative u0440u0430u0441u0441u0442u0440u043eu0439u043au0430u0445 and reduction of something u0443u0445u0430u043du0438u00a0 with positive u0440u0430u0441u0441u0442u0440u043eu0439u043au0430u0445 with the appropriate choice of the degree of u0441u0432u00a0u0437u0438 element 2 with u0440u0435u0437u043eu043du0430u0442u043eu0440u0430u043cu0438 1. 2).
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