Article

Radiation impedance design of magnetostatic forward volume wave microstrip transducer

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Abstract

The results of radiation impedance design of magnetostatic forward volume wave microstrip transducer are presented in this report. It was analysed the radiation impedance as a function of frequency for microstrip lines with different strip width and distance between the line conductors and the surface of magnetized ferrite film.

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Article
It is shown that the interaction of magnetostatic waves with a current can be characterized by a coupling constant analogous to, but much greater than, the piezoelectric coupling constant. The theory is applied both to surface and forward‐traveling volume magnetostatic waves, and the problems of excitation, reflection, and absorption by a single microstrip and by a narrow‐band interdigital transducer are treated. It is found that the coupling constant is close to 0.5 for any reciprocal wave, and is greater for any nonreciprocal wave, when the transducer is in contact with the magnetic medium. These values are too large to allow effective signal processing, since the emitted waves react strongly on the transducer; narrow‐band transducers must be lifted above the surface so as to weaken the coupling.
Article
A technique is described for computing the radiation reactance of microstrip-excited MSSW's from a Hilbert transform of a previously derived expression of the radiation resistance. The series combination of the radiation reactance, radiation resistance, and an inductive reactance corresponding to a shorted section of microstrip line forms an equivalent circuit characterizing the excitation process. Supporting impedance measurements are presented and limitations of the model are discussed. U. S. Government work not protected by U. S. copyright. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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