Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-04-18
1983-05-17
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333154, 333196, H03H 9145, H03H 964, H03H 942
Patent
active
043842640
ABSTRACT:
A surface acoustic wave device comprises a substrate and a set of interdigital electrodes disposed thereon and spaced apart. One interdigital electrode is divided along the propagating direction of the surface acoustic wave into a plurality of portion interdigital electrodes which are electrically connected in series. The electrode pattern of the one interdigital electrode is formed asymmetrically such that the static capacitances of at least two adjacent portion electrodes thereof are different from each other, preferably in such a manner that when the device is installed, the total effective static capacitances of the two adjacent portion electrodes will be substantially equal. The static capacitance of the portion electrode having a comb shaped electrode thereof which is to be grounded is selected to be smaller than that of the other portion electrode. In case of the portion electrode not having a comb shaped electrode grounded, the static capacitance of the portion electrode closer to the other interdigital electrode is selected to be smaller than of the other portion electrode.
REFERENCES:
patent: 3600710 (1971-08-01), Adler et al.
patent: 3675054 (1972-07-01), Jones et al.
patent: 3801935 (1974-04-01), Mitchell
Murata Manufacturing Company Ltd.
Nussbaum Marvin L.
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