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AssigneesHitachi Video Engineering, Inc., Hitachi, Ltd.
InventorsMitsutaka Hikita, Yoichi Saigo, Kazuhito Kurosawa
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This invention relates to the structure of a band-pass or band-rejection filters by combining a plurality of one-port surface acoustic wave resonators whose interdigital electrode fingers are disposed on a piezoelectric substrate. The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators disposed on a piezoelectric substrate for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements, and one-port surface acoustic wave resonators disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection- and passing-band.
A filter combining surface acoustic wave resonators comprising:
A filter combining surface acoustic wave resonators according 12, wherein each of said surface acoustic wave resonators includes interdigital electrode fingers disposed on said piezoelectric substrate and protruding from each respective electrode therein in a comb-like manner in a direction toward another electrode of the same surface acoustic wave resonator.
Dependencies are inferred from the claim text.