Optimization of Microwave Magnetoelastic Delay Lines

Résumé du livre

A new ray tracing computer program which optimizes the design of linearly dispersive, two-port magnetoelastic delay lines operating at microwave frequencies has been developed. The simulation shows that delay line line bandwidth and dynamic range can be separately optimized for the value of a wave focussing parameter within a limited range. Whereas previous work had demonstrated that there are a potentially infinite number of synthesized magnetic fields which produce the desired linear delay function, choice of magnetic field can now be made to obtain a desired value of the wave focussing parameter and thereby optimize delay line performance. The computer simulation is correlated with experimental magnetoelastic delay line results. Previously, linearly dispersive two-port magnetoelastic delay lines with synthesized magnetic fields had been built in both a Strauss type configuration and with a novel, 'buried-antenna' design where the antennas were wires inserted through separate holes drilled by laser in a YAG rod. The validity of the ray tracing is confirmed by the experimental data and, additionally, the simulation elucidates the causes of the differences in bandwidth performance between the design types. (RH).