Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1998-05-12
1999-09-14
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333133, 333195, 310313B, H03H 964
Patent
active
059528990
ABSTRACT:
A ladder filter includes a plurality of series arm resonators and a plurality of parallel arm resonators. The series arm resonators are connected in series to form a series arm of a ladder circuit and are located at a first integrated region. Each series arm resonator includes an edge-reflection surface acoustic wave (SAW) resonator which has a piezoelectric material portion and a pair of edges thereof and utilizes a shear horizontal surface acoustic wave to be excited on the piezoelectric material portion. Each of the parallel arm resonators is connected in parallel between the series arm and a ground potential to form a parallel arm of a ladder circuit. Each of the parallel arm resonators includes an edge reflection SAW resonator which has a piezoelectric material portion with a pair of edges thereof and utilizes a shear horizontal surface acoustic wave to be excited on the piezoelectric material portion. The parallel arm resonators include a first group of at least two parallel arm resonators which are located at a second integrated region which is physically isolated from the first integrated region such that the shear horizontal surface acoustic wave excited on the piezoelectric material portion in the first integrated region does not interfere with the shear horizontal type surface acoustic wave excited in the second integrated region.
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M. Kadota et al., IEEE Transactions on Microwave Theory and Techniques, vol. 44, No 12, Dec. 1996-"A Bleustein-Gulyaev-Shimizu Wave Resonator Having Resonances for TV and VCR Traps" pp. 2758-2762.
Ago Junya
Kadota Michio
Nadota Takeshi
Yoneda Toshimaro
Murata Manufacturing Co. Ltd.
Pascal Robert
Summons Barbara
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