[天线]Circularly Polarized Dielectric Resonator Antenna Excited by a Shorted Annular Slot

 Abstract—Excitation of the circularly polarized dielectric resonator ~q 7;8<U  
antenna (DRA) using a shorted annular slot is studied in this paper. The -G-3q
6A  
new method is demonstrated using a hemispherical DRA. The exact DRA BKay*!'PX  
Green’s function is used in the formulation, and the method of moments o,1Dqg4P3  
is employed to solve for the equivalent magnetic current in the slot. The h48YDWwy  
input impedance, axial ratio, and field patterns are found. Measurements "TNVD"RLY  
were carried out to verify the calculations, with good results. The effects of Yk'm?p#~  
the radius and shorting width of the slot are investigated, and the design myIe_k,F  
procedure of the CP DRA is discussed. KzNm^^#/$A  
Index Terms—Circ .. d*2u}1Jo8  
&pL/ @2+  

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