Abstract
Experimental studies have been performed on the suppression of the inharmonic overtone responses for realizing piezoelectric ceramic resonators with low resonance impedance compatible with a wide-area electrode(>φ15λ). The circumferential mass-loading onto the electrode is effective for the fabrication of an oscillator with a low oscillation startup voltage, without any jump to spurious frequencies. In addition, this technique results in a wide rejection bandwidth for TV/VCR adjacent-channel sound-carrier-signal traps. This effect (stepped energy-trapping) is observed to arise from the spatial vibration energy distribution dispersion by the additive weighting electrode using optical laser interferometry and finite- element-method analysis.
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