A surface wave resonator suitable for use in the frequency band range of about 70 to 200 MHz has a wide frequency band characteristic. The resonator is a free edge reflective-type surface wave resonator having a pair of comb-like electrodes formed on the upper surface of a piezoelectric...http://www.google.com/patents/US5714830?utm_source=gb-gplus-sharePatent US5714830 - Free edge reflective-type surface acoustic wave device
