Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1982-03-31
1983-12-20
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333212, 333219, H01P 1201, H01P 700, H01P 1205
Patent
active
044220596
ABSTRACT:
A band-pass filter comprising a shielded housing having a first and a second chamber. First and second quarter-wave resonators are disposed in the first and second chambers, respectively, for coupling with input energy and delivering output energy. First and second parallel-circuit resonators are disposed in the first and second chambers, respectively, to provide interstage coupling between resonators in the respective chambers. Each of the resonators comprises a multilayered coil structure on a finned bobbin juxtaposed on a common insulative substrate so that its coil portions are separately wound on adjacent fins of the bobbin. Each of the quarter-wave resonators has one end being short-circuited by coupling with the housing and the other end being open-circuited. Each of the parallel-circuit resonators includes a capacitor to form a parallel resonance circuit and has one end coupled to one end of the other parallel-circuit resonator at a point outside of the housing. First and second auxiliary coils are inductively coupled respectively with the parallel-circuit resonators, one end of each auxiliary coil being connected to the housing and the other ends of the auxiliary coils being coupled together to an external circuit.
REFERENCES:
patent: 3970972 (1976-07-01), Bunner
patent: 4210884 (1980-07-01), Tabuchi et al.
Fuji Tsuneharu
Ishikawa Takayoshi
Tsumura Masakatsu
Matsushita Electric - Industrial Co., Ltd.
Nussbaum Marvin L.
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