| 摘要 |
648,627. Impedance networks. BENDIX AVIATION CORPORATION. April 8, 1948, No. 9914. Convention date, April 14, 1947. [Class 40 (viii)] A transmission and rejection network comprises a first parallel resonant circuit connected between the anode of a valve and a source of positive potential and resonant at the rejection frequency, a second, parallel resonant circuit connected between the same anode and the grid of a subsequent valve and also resonant at the rejection frequency, and a third parallel resonant circuit connected between the grid and cathode of the second valve and resonant at the transmission frequency. In the construction shown, the first and third circuits are 11 and 15 respectively and the second circuit is in the form of a bridged T network 21. The rejected frequency may be separated instead of eliminated by inductively coupling a parallel circuit 31, resonant at this frequency and having terminals 32, to the second resonant circuit.
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