HIGH-POWER DURABILITY OF DIAMOND SURFACE-ACOUSTIC-WAVE FILTER

The power durability of the ZnO/diamond surface acoustic wave (SAW) fi lter was investigated and compared with the LiTaO3 SAW filter. The ZnO /diamond SAW filter maintained linearity of the input-output relation up to the input power of 36 dBm at 2.90 GHz, whereas the LiTaO3 SAW fi lter, which operated at 822 MHz, was nonlinear above the input power o f 23 dBm and degraded significantly at 27.7 dBm. The input power depen dence of the time to failure was also investigated for both SAW filter s. It was found that the ZnO/diamond SAW filter was durable for 8 dB h igher input power than that of the LiTaO3 SAW filter even at 3.5 times higher frequency. These results indicate the extremely high power dur ability of the ZnO/diamond SAW filter.