Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1979-12-27
1981-10-27
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333246, H01P 1203, H01P 1215, H01P 308
Patent
active
042976618
ABSTRACT:
A non-magnetized ferrite material is provided as the propagating medium for a microwave transmission line such as a microstrip or stripline transmission line. The transmission system is adapted to provide a "high pass" filter characteristic by selecting the saturation magnetization of the ferrite as a function of the desired cut-off frequency such that frequencies below the cut-off are absorbed by the ferrite material thereby producing a low reflection coefficient, while frequencies above the cut-off are transmitted with very little attenuation. One of the conductors of the transmission system can further have microwave circuit elements located thereon which provide a second "filter" characteristic, such as a reactive filter or a tunnel diode. The filter characteristics produced by the ferrite material and the circuit elements combine to produce a desired system filter characteristic.
REFERENCES:
patent: 3448409 (1969-06-01), Moose et al.
patent: 4020429 (1977-04-01), Bickley
patent: 4188594 (1980-02-01), Bongianni
Communications Satellite Corporation
Nussbaum Marvin L.
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