State of the Art in Microwave Acoustic Delay Devices

This paper will discuss the state of the art of several types of microwave acoustic delay devices and although it will concentrate mostly in the L and S band frequencies much of the content is appropriate to frequencies as high as X band. The devices to be considered are non-dispersive delay lines, acousto-optical modulators, and dispersive delay devices. In general these devices use either magnetoelastic and magnetostatic propagation in ferromagnetic crystals such as yttrium iron garnet or pure acoustic propagation in a large variety of single crystal materials.