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Radiation impedance of microstrip transducer of magnetostatic surface waves

Keywords:

E.R. Babicheva – Ph.D. (Phys.-Math.), Associate Professor, Admiral Ushakov Maritime State University G.V. Babicheva – Ph.D. (Phys.-Math.), Associate Professor, Admiral Ushakov Maritime State University. E-mail: 405092@mail.ru G.P. Sinjavskiy – D.Sc. (Phys.-Math.), Professor, Southern Federal University. E-mail: sinyavsky@sfedu.ru


By the example of the microstrip transducer, we have shown that all relationships describing characteristics of a planar MSSW transducer (the integral equation for the surface current density and expressions for the magnetic flux, proportional to the radiation impedance per unit length) are completely determined by surface permeabilities calculated in the plane of the microstrip transducer. For the case of MSSWs, the integral equation for the surface current density has been solved numerically by the method of orthogonal projections. The dependence of the transducer radiation impedance on the spacing between the microstrip and the ferrite plate has been studied. It has been found that larger values of this spacing cause both the general decrease in the coupling (lowering the radiation resistance at all frequencies) and higher frequency variations of the radiation resistance. The above approach can be used for simulation of MSSW microwave devices. Optimization of characteristics of such devices should involve both determination of the required geometry of the line launching the MSSW and the choice of parameters of external reactive elements ensuring the required matching to an external feeding line within the operating frequency band of the MSSW antenna.
References:

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  8. Vashkovskij A.V., Zubkov V.I., Kil'dishev V.N. Vliyanie die'lektricheskogo zazora mezhdu preobrazovatelem i ferritovoj plenkoj na vozbuzhdenie magnitostaticheskix voln // Radiotexnika i e'lektronika. 1983. T. 28. № 9. S. 1778–1782.
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