Token SAW Resonator employs surface acoustic wave, and is able to be applied to high frequency circuit where conventional crystal, ceramic resonators are not available, as SAW Resonator oscillates stably with its fundamental mode over frequency range from 200 MHz to around 1 GHz.
The SAW resonator uses arrays of metal strips, with pitch λ/2, as reflectors of the waves. These arrays can give strong SAW reflections, and two arrays can be used to form a SAW cavity with high Q. Such resonators are often used for high-stability oscillators.