High frequency narrow-band multi-mode filter

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

1983-07-26

1985-09-17

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333187, 333196, H03H 9145, H03H 964

Patent

active

045423563

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 piezo-electric 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 of said 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:
patent: 3600710 (1971-08-01), Adler et al.
patent: 4060777 (1977-11-01), Tiersten et al.
patent: 4166987 (1979-09-01), Coldren
Yamada et al., "Double Mode Filter by Elastically Coupled Saw Resonators", Lectures of the Acoustic Society of Japan, Oct. 1977; pp. 465-466.
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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