Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1993-07-15
1995-01-03
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333202, 3332191, 330109, H03H 1112, H01P 120, H01P 700
Patent
active
053790090
ABSTRACT:
An active-type band pass filter achieves a compact structure and a minimum noise figure by setting a coupling Q factor (Q.sub.e1) on an input side of an amplifier, a coupling Q factor (Q.sub.e2) on an output side of the amplifier, and a gain G of the amplifier so that they satisfy the condition that Q.sub.e1 <Q.sub.e2 and 1/Q.sub.e1 =G/Q.sub.e2. By increasing the term with the negative symbol in the equation ##EQU1## the total no-load Q factor (Q.sub.o) is set in the negative region.
REFERENCES:
patent: 4079341 (1978-03-01), Linn et al.
patent: 4325035 (1982-04-01), Nishikawa et al.
patent: 4816788 (1989-03-01), Ishikawa et al.
Matsumura, H. et al., "An Active Microwave Filter with Dielectric Resonator", NHK Technical Research Laboratories, Tokyo, Japan, pp. 323-325, Apr. 30-May 2, 1979.
1979 IEEE MTT-S International Microwave Symposium-Digest; Apr. 30-May 2, 1979, Orlando; IEEE, New York, 1979 by H. Matsumura et al. entitled "An Active Microwave Filter with Dielectric Resonator," pp. 323-325.
IEE Proceedings-H., Microwaves, Antennas & Propagation, vol. 139, No. 2, Apr. 1992, Steenage GB, pp. 205-207 by B. Madrangeas et al. entitled "Three-pole Dielectric Resonators Microwave Bandpass Active Filter".
1990 IEEE MTT-S International Microwave Symposium-Digest, vol. 1, May 8-10, 1990, Dallas, U.S.; IEEE, New York, U.S. 1990 by X. H. Jiao et al., entitled "Microwave Frequency Agile Filters for MIC and MMIC Applications," pp. 503-505.
Hidaka Seiji
Ishikawa Youhei
Ham Seungsook
Murata Manufacturing Co. Ltd.
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