[天线]10 Accurate analysis of TEM horn antennas for pulse radiation

一定要挣个威望！！ *1ku2e]z  
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, VOL. 38, NO. 3, AUGUST 1996 E:&=A 4%  
Accurate analysis of TEM horn antennas for pulse radiation Z7K;~*  
Kurt L. Shlager, Member, IEEE, Glenn S. Smith, Fellow, IEEE, rm+|xvZ4  
and James G. Maloney, Member, IEEE N=zrY`Vd  
Abstract-In the past, various approximate theoretical models _;v4]MU  
have been used to analyze TEM horn antennas. Because of =MB[v/M59w  
the limitations of these approximate models, there has been, #&1mc_`/  
to date, only qualitative agreement of measurements for TEM V. =!^0'A  
horn antennas with the predictions of the theories. In this paper, TN.mNl%  
the finite-difference time-domain (FDTD) method is used to ]hS4'9lD  
accurately analyze TEM horn antennas for pulse radiation. First, ,K+K`"Oy  
the metallic triangular-plate TEM horn antenna is considered. B3c rms['  
Computed results for the reflected voltage in the feeding transmission c:>&Bg&,6T  
line and the time-varying radiated electric field are shown to 8"N<g'Yl,  
be in very good agreement with new experimental measurements. &P&M6v+  
Graphs of the electric field in the space surrounding the antenna vbmi_[,U  
(magnitude of field plotted on a color scale) are used to give >y(;k|
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physical insight into the process of radiation. Next, the method is (pREo/T  
used to analyze two TEM horns that were previously designed for jXSo{  
pulse radiation. The geometry and electrical properties of these A%k@75V@  
antennas are more complicated than for the metallic, triangularplate X4Q?]{  
horn. One has shaped metallic plates with a resistive pLDseEr<  
termination at the open end; the other has plat .. g9<*+fV 2$  
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