Surface acoustic wave device with mutiple pass bands

Details Surface acoustic wave device with mutiple pass bands Surface acoustic wave device with mutiple pass bands

1998-04-07

2000-05-02

Pascal, Robert

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333195, H03H 746, H03H 964

Patent

active

060577444

ABSTRACT:
A surface acoustic wave device includes first and second SAW filters and first, second and third SAW resonators. The first SAW filter has first and second ends and a first pass band in a first frequency region, and the second SAW filter has first and second ends and a second pass band in a second frequency region which is lower than the first frequency region. The second end of the second SAW filter is connected to the second end of the first SAW filter in parallel to form a connection point. The first and second one-port SAW resonators are connected in series between the second end of the first SAW filter and the connection point, and have an antiresonant frequency higher than the frequency of the pass band of the first SAW filter. The third one-port SAW resonator connected in series between the second end of the second SAW filter and the connection point and has an antiresonant frequency higher than the frequency of the pass band of the second SAW filter.

REFERENCES:
patent: 5521453 (1996-05-01), Yatsuda
patent: 5694096 (1997-12-01), Ushiroku et al.
patent: 5717367 (1998-02-01), Murai
patent: 5726610 (1998-03-01), Allen et al.
patent: 5864262 (1999-01-01), Ikada
Ikada et al.; Proceedings of IEIC (The Institute of Electronics, Information, and Communication Engineers) General Conference-A-11-19, Mar. 24-27, 1997; "Low Loss Duel Band Saw Filter for PDC Makitori"; p. 294.

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