Filter having resonators coupled by a saw filter and a duplex fi

Details Filter having resonators coupled by a saw filter and a duplex fi Filter having resonators coupled by a saw filter and a duplex fi

1994-02-28

1995-11-14

Lee, Benny

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333133, 333193, 333202, 370 38, 370123, H03H 746, H01P 1213

Patent

active

054670659

ABSTRACT:
A filter, particularly suitable for radio frequency applications comprises a first filter which, in turn, comprises at least a pair of intercoupled resonators (RES1, RES2), and a SAW filter (SAW) which is coupled between the two intercoupled resonators so that a signal input to the filter at its input (IN) is coupled through the SAW filter to provide an output signal at its output (OUT). This provides a filter with all the advantages of a SAW filter, but with the ability to withstand the high power requirements of radio frequency applications. If three or more resonators are present in the first filter, then an amplifier can also be integrated in the filter. The SAW filter (and the amplifier if present) are inductively or capacitively coupled to the resonators depending upon the type of filter that is required.

REFERENCES:
patent: 4509165 (1985-04-01), Tamura
patent: 4694266 (1987-09-01), Wrightt
patent: 5077545 (1991-12-01), Gopani et al.
patent: 5254962 (1993-10-01), Morris et al.
J. Vandewege et al., "Acoustic Surface Wave Resonators for Broadband Applications", 8th European Microwave Conference-Proceedings, Sep. 4-8, 1978, pp. 663-667.
K. Anemogiannis et al., "Saw Microstrip Front-End for Mobile Communication Systems in the GHZ Range", 1991 IEEE MTT-S International Microwave Symposium Digest, vol. III, Jun. 10-14, 1991, pp. 973-976.
Patent Abstracts of Japan, vol. 9, No. 53 (E-301) 7 Mar. 1985 & JP-A-59 194 501 (Matsushita Denki Sangyo K.K.) 5 Nov. 1984, 1 page.
W. Schwab et al., "A Low-Noise Active Bandpass Filter", IEEE Microwave and Guided Wave Letters, vol. 3, No. 1, Jan. 1993, pp. 1-2.

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