Surface acoustic wave demultiplexer using different piezoelectric materials for substrates of two saw filters
AssigneeMurata Manufacturing Co., Ltd.
InventorsKiwamu Sakano, Ryoichi Omote
Life of this patent
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Abstract
A surface acoustic wave demultiplexer includes a first surface acoustic wave filter, a second surface acoustic wave filter having a higher center frequency than the first surface acoustic wave filter, and a one-port surface acoustic wave resonator connected to an input terminal of the first surface acoustic wave filter in series and having an anti-resonant frequency in the stop band of the first surface acoustic wave filter. A first piezoelectric substrate that constitutes the first surface acoustic wave filter and a second piezoelectric substrate that constitutes the second surface acoustic wave filter are made from different piezoelectric materials.
Claims18
A surface acoustic wave demultiplexer comprising:
- a first surface acoustic wave filter having a first piezoelectric substrate, an input terminal and an output terminal;
- a second surface acoustic wave filter having a second piezoelectric substrate, an input terminal and an output terminal, the second surface acoustic wave filter having a higher center frequency than the first surface acoustic wave filter;
- and
- a one-port surface acoustic wave resonator connected to the input terminal of the first surface acoustic wave filter in series and having an anti-resonant frequency in the stop band of the first surface acoustic wave filter;
- wherein
- the first piezoelectric substrate of the first surface acoustic wave filter and the second piezoelectric substrate of the second surface acoustic wave filter are made of different piezoelectric materials.
A method of manufacturing a surface acoustic wave demultiplexer module comprising the steps of:
- forming a first surface acoustic wave filter having a first piezoelectric substrate, an input terminal and an output terminal;
- forming a second surface acoustic wave filter having a second piezoelectric substrate, an input terminal and an output terminal, the second surface acoustic wave filter having a higher center frequency than the first surface acoustic wave filter;
- and
- forming a one-port surface acoustic wave resonator connected to the input terminal of the first surface acoustic wave filter in series and having an anti-resonant frequency in the stop band of the first surface acoustic wave filter;
- wherein
- the first piezoelectric substrate of the first surface acoustic wave filter and the second piezoelectric substrate of the second surface acoustic wave filter are made of different piezoelectric materials.
Dependencies are inferred from the claim text.