Filter with electrically adjustable attenuation characteristic

Details Filter with electrically adjustable attenuation characteristic Filter with electrically adjustable attenuation characteristic

1991-08-14

1993-07-13

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333235, H01P 1205

Patent

active

052277488

ABSTRACT:
A tunable bandstop/bandpass filter particularly suitable for use in duplex applications where the transmit and receive bands are closely located, comprises two or more reactively coupled quarter wavelength resonators e.g. dielectric resonators. One end of each resonator is coupled to ground potential. The opposite (open-circuit) end of the resonators is coupled to adjacent resonators via coupling capacitors. Voltage controlled tuning means, e.g. a varactor and series connected capacitor, are coupled in parallel to the open circuit end of each of the resonators respectively. The stopband/passband of the filter can thus be adjusted by varying the voltage applied to the tuning means. Additionally, in the case of a bandpass filter a tunable zero (or "notch") may be introduced into the transmission response by including varactors coupled in series to the open-circuit end of the resonators.

REFERENCES:
patent: 3723773 (1973-03-01), Adams et al.
patent: 3903487 (1975-09-01), Maier
patent: 4268809 (1981-05-01), Makimoto et al.
patent: 4714906 (1987-12-01), D'Albaret et al.
patent: 4721932 (1988-01-01), West
patent: 4799034 (1989-01-01), Silverman et al.
patent: 4835499 (1989-05-01), Pickett
patent: 4983938 (1991-01-01), Sasaki et al.

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