Saw filter with a coupled saw impedance element

Details Saw filter with a coupled saw impedance element Saw filter with a coupled saw impedance element

1994-07-26

1997-03-11

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, 310313D, 333195, H03H 964

Patent

active

056105665

ABSTRACT:
This invention relates to an electronic device having a frequency dependent signal transfer characteristic which is electrically coupled to at least one SAW transducer. The SAW transducer acts as a SAW impedance element since it exhibits frequency dependent electrical characteristics. Such characteristics are utilised so that the transmission loss of the SAW impedance element is high in a relatively low signal transfer region of the signal transfer characteristic of the electronic device, and low in a relatively high signal transfer region of the signal transfer characteristic of the electronic device. This has the advantage that signals outside of the passband of the electronic device can be attenuated without increasing the transmission loss of the electronic device in its passband.

REFERENCES:
patent: 4006290 (1977-02-01), Momberger et al.
patent: 4166258 (1979-08-01), Tseng
patent: 4785270 (1988-11-01), Kinsman
patent: 5093638 (1992-03-01), Kinsman et al.
patent: 5254962 (1993-10-01), Morris et al.
"Surface Acoustic Wave Resonators" by Haydl, Microwave Journal, vol. 19, No. 9, Sep. 1976, pp. 43-46.
Patent Abstracts of Japan, vol. 1, No. 47, Dec. 8, 1976, JP-A-51142943.
"Saw Integrated Modules for 800-MHz Cellular Radio Portable Telephones With New Frequency Allocations" by Hikita et al., IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 36, No. 5, Sep. 1989, pp. 531-539.
"Design Methodology and Synthesis Techniques for Ladder-Type Saw Resonator Coupled Filters" by Hikita et al., 1993 IEEE Ultrasoni Symposium, pp. 15-24 no month.
"Development of Low-Loss Band-Pass Filters Using Saw Resonators for Portable Telephones" by Ikata et al., IEEE 1992 Ultrasonics Symposium, pp. 111-115 no month.
"SAW Devices for Consumer Communication Applications" by Ruppel et al., IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 40, No. 9, Sep. 1993, pp. 438-452.
"Miniature SAW Antenna Duplexer for 800-MHz Portable Telephone Used in Cellular Radio Systems" by Hikita et al., IEEE Transactions On Microwave Theory And Techniques, vol. 36, No. 6, 1988, pp. 1048-1056 no month.

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