Patent Number: 7,786,827

Title: Surface acoustic wave device, transmitter, and transceiver

Abstract: A surface acoustic wave device comprises a surface acoustic wave element, including: a piezoelectric substrate, a first interdigital transducer unit having a first interdigital transducer and a second interdigital transducer formed on the piezoelectric substrate, and a second interdigital transducer unit having a third interdigital transducer and a fourth interdigital transducer formed on the piezoelectric substrate; a first terminal electrically coupled to the first interdigital transducer; a second terminal electrically coupled to the second interdigital transducer; a first variable resistor electrically coupling the first terminal to the third interdigital transducer; a second variable resistor electrically coupling the first terminal to the fourth interdigital transducer; a third variable resistor electrically coupling the second terminal to the third interdigital transducer; and a fourth variable resistor electrically coupling the second terminal to the fourth interdigital transducer.

Inventors: Yoneya; Katsuro (Azumino, JP), Nishio; Shinji (Suwa, JP), Onuki; Masahiro (Fujisawa, JP)

Assignee: Epson Toyocom Corporation

International Classification: H03H 9/64 (20060101); H03B 5/32 (20060101)

Expiration Date: 8/31/12018