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

Abstract—A rigorous analysis of the conformal-strip-excited rG4';V^q  
hemispherical dielectric resonator antenna (DRA) with multiple !G SV6  
parasitic strips is presented in this paper. The problem is formulated v%"|WV[N  
using the Green’s function approach, with the strip currents IPgt|if^  
solved by using the method of moments. It is found that the strips eZ|%<Wpu  
can be used to tune the operating frequency of both the linearly aa>xIW,u  
polarized (LP) and circularly polarized (CP) DRAs. In designing the LP DRA, the parasitic strips are placed symmetrically in R_sr?V|"  
pairs to minimize cross-polarized radiation fields. For the CP r<K(jG[:{f  
DRA, however, the parasitic strips are asymmetric, with their PV9pa/`@  
parameters determined by using the Genetic Algorithm. Measurements A6:es_  
were carried out to verify the calculations, and reasonable i\KQ!f>A  
agreement between theory and experiment is obtained. LXbP 2  
In .. MYla OT  
r30 <(nF  

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