Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1990-07-09
1992-09-22
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333175, 333207, H03H 712, H01P 1202
Patent
active
051500850
ABSTRACT:
A multi-pole filter for use in radio apparatus includes a plurality of isolated ceramic resonators each having an associated varicap diode network to enable electronic tuning respective of ceramic resonators. The inputs of adjacent ceramic resonators are coupled via a first coupling path and also via a second coupling path, the first coupling path being composed of a fixed capacitance network and the second coupling path being composed of a capacitance network including the varicap diode networks associated with the adjacent resonators. The selective values of the various capacitances forming the first and second coupling paths are such that the overall coupling between the resonators remains substantially constant during the electronic tuning of the resonators by the varicap diode network.
REFERENCES:
patent: 3110004 (1963-11-01), Pope
patent: 3889214 (1975-06-01), Petitjean et al.
patent: 4714906 (1987-12-01), D'Albaret et al.
patent: 4721932 (1988-01-01), West
patent: 4839617 (1989-06-01), Speake
patent: 5028894 (1991-07-01), Speake
LaRoche Eugene R.
Lee Benny
Treacy David R.
U.S. Philips Corporation
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