High-frequency tunable filter

Details High-frequency tunable filter High-frequency tunable filter

1993-03-16

1994-12-27

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333175, H03H 701

Patent

active

053769074

ABSTRACT:
The high frequency tunable filter includes first and second oscillating circuits tuned by voltage-controlled varicap diodes and coupled together via coupling varicap diodes. The voltage-controlled varicap diodes for the tuning of the oscillating circuits and the coupling varicap diodes are controlled by an identical control voltage to obtain the tuning of the filter to its working frequency and to obtain the critical coupling of the two oscillating circuits. The filter finds particular application in the area of portable radio transceivers.

REFERENCES:
patent: 3110004 (1963-11-01), Pope
patent: 4450417 (1984-05-01), Folkmann
patent: 4839617 (1989-06-01), Speake
patent: 5023941 (1991-06-01), Trumpff et al.
patent: 5150085 (1992-09-01), Hales

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