Magnetostatic wave terminations

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Abstract
Magnetostatic waves (MSW) propagating in low line‐width (ΔH<0.5 Oe) yttrium iron garnet (YIG) films grown by liquid phase epitaxy (LPE) constitute a potential basis for analog signal processing directly at microwave frequencies (1–20 GHz). MSW device techniques are complementary to those utilized in surface acoustic wave (SAW) devices at VHF/UHF. A necessary prerequisite for a high performance MSW analog signal processing technology is a low insertion loss (<20 dB) delay line with low passband ripple (<2 dB). Shorted, narrow microstrip transducers readily provide the low insertion loss; thus, the major problem is that of terminating unwanted waves within the YIG samples. Unterminated magnetostatic forward volume wave (MSFVW) delay lines can easily have passband ripple in excess of 20 dB. By measuring the frequency periodicities of these ripples in the passband and the corresponding group delays, all sources of reflection have been identified. Terminations consisting of magnetic recording tape, ferrite powder slurries, and surface‐abraded YIG have been tested on the YIG end regions. The MSFVW passband ripple has been reduced to less than 2 dB, over the 500 MHz band from 2.7 to 3.2 GHz, in a reproducible manner.

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