Patent ID: 6057744
Filing Date: 2000-05-02
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a first SAW filter having first and second ends and a first pass band in a first frequency region;a second SAW filter having 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 being connected to the second end of the first SAW filter in parallel to define a connection point;first and second one-port SAW resonators connected in series between the second end of the first SAW filter and the connection point, the first and second one-port SAW resonators having an antiresonant frequency higher than the frequency of the pass band of the first SAW filter, the first and second one-port SAW resonators including a pair of reflectors having a plurality of electrode fingers, respectively, and a number of the electrode fingers of the first one-port SAW resonators is different from that of the second one-port SAW resonator; anda third one-port SAW resonator connected in series between the second end of the second SAW filter and the connection point, the third one-port SAW resonator having an antiresonant frequency higher than the frequency of the pass band of the second SAW filter.