Abstract
In this paper, a millimeter-wave antenna is constructed with layered magnetic thin films with different saturation magnetizations placed on a grounded conductor and with a periodic structure on the upper layer interfacing with air. Under the condition in which a dc magnetic field is applied externally, the scanning characteristics and the radiation efficiency of the antenna are analyzed with a perturbation method. In the analysis, the multiple scale method also is applied. From the primary field, the coupling characteristics of the radiation field with the guided field and the incident field are derived while the amplitude transport equation is derived from the secondary field. By means of these results, the expressions for the radiation efficiency and the radiation angle of the antenna are obtained. Numerical calculations are carried out in the millimeter-wave frequency range so that the magnetic field dependence of the beam scanning angle and the radiation efficiency are investigated. From the numerical results obtained, it is found possible to construct a magnetically tuned millimeter-wave antenna with a large radiation efficiency and a large beam scanning angle by adjusting the structural parameters of the antenna consisting of two layers of magnetic slabs with different saturation magnetizations.
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