Comparison of the theoretical temperature dependence of power leakage with experiments on LST-cut quartz

The theoretical temperature dependence of the center frequency and insertion loss of SAW (surface acoustic wave) filters on the LST-cut of quartz is compared with experimental results. Theoretical values including metallization effect are in good agreement with experiments. The temperature dependence of the center frequency on the LST-cut filters is greatly affected by both the cut-angle and the aluminium thickness of the interdigital transducer. The temperature dependence of insertion loss is mainly affected by the cut-angle. It is found by theoretical calculation that there is a combination of cut-angle and an aluminium thickness which exhibits both the minimum temperature frequency shift and change of insertion loss