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

 Abstract—Excitation of the circularly polarized dielectric resonator _WO*N9Iz  
antenna (DRA) using a shorted annular slot is studied in this paper. The Q
x}\[  
new method is demonstrated using a hemispherical DRA. The exact DRA [xe(FFl+  
Green’s function is used in the formulation, and the method of moments se(ZiyHp  
is employed to solve for the equivalent magnetic current in the slot. The r-&Rjg  
input impedance, axial ratio, and field patterns are found. Measurements JKN0:/t7Q  
were carried out to verify the calculations, with good results. The effects of ,_ }  
the radius and shorting width of the slot are investigated, and the design #EQwl6  
procedure of the CP DRA is discussed. `dO)}}| y  
Index Terms—Circ .. Z7a~M3VnZ  
l*V]54|ON3  

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