Microwave Acoustic Devices

Acoustic waves have several attractive features for device applications. Low velocities lead to compact devices. Use of crystalline materials gives low propagation losses and good reproducibility and stability. Surface acoustic waves offer in addition exceptional versatility, owing to accessibility of the propagation path. The wide variety of devices includes delay lines, pulse compressors, bandpass filters and oscillators, with applications mainly in radar, communications and ESM. This paper reviews these devices and their applications.