Surface acoustic wave device with two filters each having capaci

Details Surface acoustic wave device with two filters each having capaci Surface acoustic wave device with two filters each having capaci

1998-08-10

1999-08-10

Pascal, Robert

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333195, H03H 972

Patent

active

059364831

ABSTRACT:
A surface acoustic wave device has a structure in which first and second filters are connected in parallel at a connection point connected to an input terminal or an output terminal. The surface acoustic wave device includes the first SAW filter having a capacitive impedance in a passband of the second SAW filter and having a higher passband than the second SAW filter and the second SAW filter having a capacitive impedance in the passband of the first SAW filter and having a lower passband than the first SAW filter. The second SAW filter is connected in parallel at the connection point on the input terminal or output terminal side of the first SAW filter. The impedance of the first SAW filter in the passband at the parallel-connected end has, before parallel connection, a resistance component of about 1.2 Z.sub.0 or higher with respect to the characteristic impedance Z.sub.0 of the device, and is higher than the impedance of the second SAW filter in the passband at the parallel-connected end thereof.

REFERENCES:
patent: 5521453 (1996-05-01), Yatsuda
patent: 5694096 (1997-12-01), Ushiroku et al.
patent: 5717367 (1998-02-01), Murai
patent: 5864262 (1999-01-01), Ikada
Proceedings of IEIC (The Institute of Electronics, Information, and Communication Engineers) General Conference (Mar. 24-27, 1997), Kansai University, Suita, Osaka, Japan, p. 294.

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