Introduction

The Technical Committee on Microwave Acoustics has undertaken the task of putting together this special issue on \´microwave acoustics." The subject of this issue overlaps a great deal with the field of interest of the IEEE Sonics and Ultrasonics Group. Therefore, it was decided to make the special issue a joint effort between the G-MTT and the G-SU, and wish to thank that group for all its help and cooperation. The avowed purpose of this issue is to inform the readership of the developments and problem areas in microwave acoustics. It is hoped that it will make more microwave-oriented researchers aware of the relevance of their microwave backgrounds to microwave acoustics and will stimulate them to begin working in this field.