专利名称：NOTCH FILTER NETWORK发明人：KAEGEBEIN D,US申请号：US30977272申请日：19721127公开号：US3815137A公开日：19740604
摘要：A duplex arrangement of filter networks has, on the transmitter side, a quarterwave cavity resonator tuned to the transmitter carrier frequency and coupled to thecoaxial transmission line in quarter wave spaced relation. A variable quarter wavereactance section is similarly coupled to the line and coacts with the resonator to createa condition of anti-resonance at the receiver frequency. On the receiver side, a quarterwave resonator and a variable quarter wave section are similarly coupled to the
transmission line a quarter wave from the antenna connection, the resonator being tunedto the receiver frequency, and the reactance section coacting with the resonatorreactance to create a condition of anti-resonance at the transmitter carrier frequency. Aline connecting the resonator to the transmission line can be of the same characteristicimpedance or, if greater attenuation at a greater frequency separation is desired, of alower characteristic impedance than that of said transmission line.
申请人：SINCLAIR RADIO LABOR INC,US
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