Patent ID: 7786827

Claim:
A surface acoustic wave device, comprising: 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.