High frequency narrow-band multi-mode filter

Details High frequency narrow-band multi-mode filter High frequency narrow-band multi-mode filter

1986-04-08

1992-06-09

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333187, 333196, H03H 964

Patent

active

RE0339571

ABSTRACT:
A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezoelectric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators are acoustically coupled to each other to cause these vibration modes, are experimentally found, and the above conditions are satisfied by the filter.
In order to reduce the ohmic loss of a very narrow common bus bar, the number of strip pairs of electrode in both interdigital transducers (hereinafter referred to as IDT) is minimized and instead reflectors are provided on the both sides TDTs to compensate for the reduction of its Q value. A part of the bus bar for the IDT electrodes is formed integral with some or all of gratings of the reflectors, whereby the connecting positions of the grating electrodes with respect to lead terminals can be positioned with a high freedom.

REFERENCES:
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patent: 4166987 (1979-09-01), Coldren
patent: 4331943 (1982-05-01), Cross et al.
patent: 4480237 (1984-10-01), Yamada
Yamada et al--"Double Mode Filter Based on Elastically Coupled Saw Resonators", Report on Symposium of Electronics and Communication of Japan, The Institute of Electronics and Communication Engineers of Japan, US77-33, Aug. 19, 1977; pp. 29-34.
Onoe M. & Tumanji, H.; "Analysis of Piezoelectric Resonator Vibratory in Trapped Energy Mode"; Report of Electronics Communication, Japan; No. 9 pp. 84-93, Sep. 1965.
Nakazawa, Y.; "High Frequency Crystal Electromechanical Filters and Their Characteristics" Toyo Comm. Equip. Company, Japan; published Dec., 1963; translation included.
Haydl, W. H. et al.; "Multimode SAW Resonators--A method to study the Optimum Resonator Design"; 1976 Ultrasonics Syposium Proc; Annap Md; 29 Sep.-1 Oct. 1976; pp. 287-296.
Hartmann, Clinton S.; "Recent Advances in SAW Devices"; 1977 NTC conference; 5-7 Dec. 1977; pp. 16:2-1 to 16:2-5.
Yamada and Shimuzo--"Double Mode Filter by Elastically Coupled SAW Resonators", Lectures of the Acoustic Society of Japan, Oct. 1977; pp. 456-466.
Yamada et al.--"The Design of a Double-Mode SAW Resonator Filter Utilizing Waveguide Coupling", Lectures of the Acoustic Society of Japan, Oct. 1980; pp. 65-66.

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