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

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, VOL. 38, NO. 3, AUGUST 1996 =S#9\W&6Q  
Accurate analysis of TEM horn antennas for pulse radiation $raq,SP  
Kurt L. Shlager, Member, IEEE, Glenn S. Smith, Fellow, IEEE, i24t$7q  
and James G. Maloney, Member, IEEE
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Abstract-In the past, various approximate theoretical models F#=M$j_  
have been used to analyze TEM horn antennas. Because of v(=?@tF}E  
the limitations of these approximate models, there has been, A{|^_1  
to date, only qualitative agreement of measurements for TEM "lLwgh;  
horn antennas with the predictions of the theories. In this paper, /F@CrNFb(  
the finite-difference time-domain (FDTD) method is used to %[B^b)2  
accurately analyze TEM horn antennas for pulse radiation. First, &
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the metallic triangular-plate TEM horn antenna is considered. P8[rp  
Computed results for the reflected voltage in the feeding transmission Vq$8!#~w  
line and the time-varying radiated electric field are shown to LT[g +zGB  
be in very good agreement with new experimental measurements. z*k(` '  
Graphs of the electric field in the space surrounding the antenna Nk2n&(~$  
(magnitude of field plotted on a color scale) are used to give G{CKb{  
physical insight into the process of radiation. Next, the method is s_o{w"3X  
used to analyze two TEM horns that were previously designed for v9*31Jx  
pulse radiation. The geometry and electrical properties of these 4]G J
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antennas are more complicated than for the metallic, triangularplate ]sLdz^E3D  
horn. One has shaped metallic plates with a resistive 6pP:Q_U$  
termination at the open end; the other has plat .. pT|l"q@  
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