手征铁氧体的本构参数对偶极天线空间扫描特性的影响

The Effects of the Constitutive Parameters of Chiroferrites on the Scanning Characteristics of Dipole Antenna

应用广义谱域指数矩阵技术，研究了一种新型双各向异性手征铁氧体材料的本构参数对偶极天线远区场特性的影响，而这种复合介质是非互易手征和普通铁氧体材料的复合体。用数值方法重点分析了手征铁氧体的内部偏置磁场、手征和非工易参数的色散特性等物理量引起的偶极天线方向图变形和主波束方向偏转效应。

Recently, a new kind of artificial medium has been presented by Enghcta et al[4]. Such novel material is a mixture of the nonreciprocal or reciprocal chiral medium and gyrotropic ferrite. In this paper,the possibility of using chirofcrrites as the substrate and superstratc of microstrip antenna is suggested.With the help of the generalized spectral domain-exponcntial matrix technique, the effects of the constitutivc parameters of chirofcrritcs on the far-field behaviour of dipole antenna are examined.(1) Fig.2(a)(b) gives graphically the degree to which the relative magnitudes and shapes of the farezone field, Eo and Ed are affected by the strength and orientation of internally biased magnetic field of chirofcrrite.(2) Fig.3(a)(b) gives graphically the degree to which the shapes and main beam directions of radiation patterns arc affected by the dispersion characteristics of chirality and nonreciprocity parameters.Figs.2 and 3 arc also obtained through numerical analysis.