Resonator ladder surface acoustic wave filter suppressing spurio

Details Resonator ladder surface acoustic wave filter suppressing spurio Resonator ladder surface acoustic wave filter suppressing spurio

1996-04-09

1998-03-17

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313A, 310313B, H03H 964

Patent

active

057291861

ABSTRACT:
A resonator ladder surface acoustic wave (SAW) filter, which has a wide and flat pass band without spurious signals therein is provided. An input electrode, a serial arm SAW resonator, an output electrode, a parallel arm SAW resonator and a ground electrode are respectively formed on a 41.degree.-rotated Y-cut X-propagation lithium niobate substrate. The serial arm SAW resonator comprises a pair of interdigital transducers (IDTs) to excite SAW, one of which is connected to the input electrode. The output electrode is connected to the other IDT of the serial arm SAW resonator. The parallel arm SAW resonator comprises a pair of IDTs to excite SAW, one of which is connected to the output electrode. And the ground electrode is connected to the other IDT of the parallel arm SAW resonator. The IDTs are metal films of Al or Al-based alloy, and the thickness of the metal films ranges from 2.5% to 7.5% of the electrode cycle of the IDT of the parallel arm SAW resonator.

REFERENCES:
patent: 4635009 (1987-01-01), Ebata
patent: 4837476 (1989-06-01), Mochizuki
patent: 4978879 (1990-12-01), Satoh et al.
patent: 5471178 (1995-11-01), Hickernell
patent: 5506552 (1996-04-01), Seki et al.
"The Institute of Electronics and Communication Engineers of Japan", 84/1, vol. J67-C No. 1, pp. 158-165.
"Simple estimation for SSBW excitation strength", by M. Yamaguchi et al., J. Acoust. Soc., Jpn. (E)6, 1(1985), pp. 51-54.

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