One-port surface acoustic wave resonator and surface acoustic wave filter

A one-port surface acoustic wave resonator comprising:

• a rotated Y-cut LiTaO3 substrate;
• an interdigital electrode transducer disposed on the LiTaO3 substrate and including electrode fingers;
• and
• reflectors disposed on both sides of the interdigital electrode transducer in a surface acoustic wave propagation direction of the interdigital electrode transducer;
• wherein
• when an electrode finger width of the electrode fingers of the interdigital electrode transducer is denoted by a and a gap between the electrode fingers is denoted by b, a metallization ratio, a/(a+b), is in the range of about 0.55 to about 0.85;
• and
• the interdigital electrode transducer is overlapping-length weighted.

A one-port surface acoustic wave resonator comprising:

• a rotated Y-cut LiTaO3 substrate;
• an interdigital electrode transducer disposed on the LiTaO3 substrate and including electrode fingers;
• and
• reflectors disposed on both sides of the interdigital electrode transducer in the surface acoustic wave propagation direction of the interdigital electrode transducer;
• wherein
• a metallization ratio, a/(a+b), is in the range of about 0.45 to about 0.85, where an electrode finger width of the electrode fingers of the interdigital electrode transducer is denoted by a and a gap between the electrode fingers is denoted by b;
• the interdigital electrode transducer is overlapping-length weighted;
• and
• a cut angle of the LiTaO3 substrate is in the range of about 40° to about 60°.