[天线]Frequency Tuning of the Linearly and Circularly Polarized Dielectric Resonator Antennas

Abstract—A rigorous analysis of the conformal-strip-excited  @e\ @EW  
hemispherical dielectric resonator antenna (DRA) with multiple P*%P"g  
parasitic strips is presented in this paper. The problem is formulated c=?6`m,"M  
using the Green’s function approach, with the strip currents z?VjlA(X  
solved by using the method of moments. It is found that the strips vr?u=_%Z  
can be used to tune the operating frequency of both the linearly jLO$[c`;  
polarized (LP) and circularly polarized (CP) DRAs. In designing the LP DRA, the parasitic strips are placed symmetrically in q(R|3l^6T  
pairs to minimize cross-polarized radiation fields. For the CP pV\>?  
DRA, however, the parasitic strips are asymmetric, with their /[/{m]  
parameters determined by using the Genetic Algorithm. Measurements R47y/HG,  
were carried out to verify the calculations, and reasonable 3QVUWhJ  
agreement between theory and experiment is obtained. ,!,M'<?"  
In .. aR@+Qf  
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