Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1989-04-07
1992-05-19
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313B, H03H 964
Patent
active
051152169
ABSTRACT:
Disclosed is a SAW filter employing a SAW resonator which is constructed of a plurality of pairs of electrode fingers formed on a piezoelectric substrate, and in which a plurality of SAW transmission spaces are included. The SAW transmission spaces do not have the function of exciting a SAW, and they have electric lengths which match the phases of SAWs excited by the resonator. In accordance with frequency characteristics required of the filter, such SAW transmission spaces are introduced into, for example, one of a plurality of SAW resonators located on the electric power input side of the filter.
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"Miniature Surface-Acoustic-Wave Filters", Andrew J. Slobodnik, Jr., et al., Proceedings of the IEEE, vol. 67, No. 1, Jan. 1979.
Hikita Mitsutaka
Kurosawa Kazuhito
Shibagaki Nobuhiko
Tabuchi Toyoji
Hitachi , Ltd.
LaRoche Eugene R.
Lee Benny
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