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

Abstract—A rigorous analysis of the conformal-strip-excited YyIt-fPZ  
hemispherical dielectric resonator antenna (DRA) with multiple 4>*`26  
parasitic strips is presented in this paper. The problem is formulated ( Iew%U  
using the Green’s function approach, with the strip currents J~.kb k  
solved by using the method of moments. It is found that the strips W(YJz#]6_  
can be used to tune the operating frequency of both the linearly <H6Uo#ao  
polarized (LP) and circularly polarized (CP) DRAs. In designing the LP DRA, the parasitic strips are placed symmetrically in za7wNe(s  
pairs to minimize cross-polarized radiation fields. For the CP ^ZG1  
DRA, however, the parasitic strips are asymmetric, with their PAkW[;GSDh  
parameters determined by using the Genetic Algorithm. Measurements n}{cs  
were carried out to verify the calculations, and reasonable kZQ;\QL1}  
agreement between theory and experiment is obtained. X)m2{@v D  
In .. 6-"&jbvm  
cqudF=q  

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