The status of magnetostatic devices

Techniques under investigation to modify the dispersion and bandwidth of magnetostatic waves for device applications are Briefly reviewed. Four devices exhibiting useful characteristics are described in detail. These are a delay line with a delay against frequency variation which is linear within ± 5nS over a 1GHz bandwidth in X-band, a programmable 4-tap delay line which can generate and correlate Barker coded signals at 9GHz, a delay stabilized oscillator showing better frequency stability with temperature than YIG sphere oscillators and a signal to noise enhancer. This latter device is unique as it provides a low loss to coherent signals above a threshold power but increased losses to broadband noise or other signals below threshold.