Conductance measurements on a leaky SAW harmonic one-port resonator

Conductance measurements are reported on a leaky SAW (LSAW) harmonic one-po rt resonator on a 64 degrees Y - X LiNbO3 substrate. This employed a short three-finger IDT for fundamental and second harmonic operation together wit h long reflection gratings. Conductances were measured with and without the end gratings. From an analysis of the measurements, it was deduced that, f or optimum second harmonic performance, the grating stopband frequency shou ld be higher than the IDT unperturbed center frequency This result is in co ntrast to fundamental frequency resonator designs in which the end grating stopband frequency is placed below the IDT center frequency for optimum per formance.