MECHANICAL-WAVE FILTERING IN A PERIODICALLY CORRUGATED ELASTIC PLATE

The method of multiple scales is employed to analyze the interaction o f SH modes in an elastic plate having periodically corrugated outerfac es. Two types of resonant conditions leading to two-mode as well as fo ur-mode interactions are considered. The results of the analysis are u tilized to develop ultrasonic mechanical wave filters operating on fre quency bands centered al the resonant frequency. The stop-band filter frequency response is presented in terms of the power reflection coeff icient. The characteristics of reflection of these filters are enhance d by imposing amplitude taper on the periodic corrugations.