[天线]Wide-Band Planar Monopole Antennas

內容摘要： *YL86R+U  
The circular disc monopole (CDM) antenna has been reported Z"%.  
to yield wide-impedance bandwidth. Experiments have been carried euVDrJ^  
out on a CDM that has twice the diameter of the reported disc 2[HPU M2>  
with similar results. New configurations are proposed such as elliptical dH PvVe/  
(with different ellipticity ratios), square, rectangular, and hexagonal disc  BgQ/$,  
monopole antennas. A simple formula is proposed to predict the frequency V7r_Ubg@K  
corresponding to the lower edge of the bandwidth for each of these 0 !{X8>x  
configurations. The elliptical disc monopole (EDM) with ellipticity ratio
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of 1.1 yields the maximum bandwidth from 1.21 GHz to more than 13 p:5NMo  
GHz for voltage standing wa .. s1[&WDedM  
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