[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 b#ih=qE  
Accurate analysis of TEM horn antennas for pulse radiation $\:;N]Cs~0  
Kurt L. Shlager, Member, IEEE, Glenn S. Smith, Fellow, IEEE, 9|y?jb5im  
and James G. Maloney, Member, IEEE 'Z^-(xG,+  
Abstract-In the past, various approximate theoretical models CKoRq|QG_  
have been used to analyze TEM horn antennas. Because of 6x?3%0Km  
the limitations of these approximate models, there has been, :Kc9k(3&r  
to date, only qualitative agreement of measurements for TEM 9 b?Nlk8d  
horn antennas with the predictions of the theories. In this paper, >93I|C|  
the finite-difference time-domain (FDTD) method is used to 9fLxp$`(T  
accurately analyze TEM horn antennas for pulse radiation. First, 0O,Q]P 82f  
the metallic triangular-plate TEM horn antenna is considered. Qq,
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Computed results for the reflected voltage in the feeding transmission FVi7gg.?  
line and the time-varying radiated electric field are shown to QQ1|]/)  
be in very good agreement with new experimental measurements. {,kA'Px)  
Graphs of the electric field in the space surrounding the antenna UBj"m<  
(magnitude of field plotted on a color scale) are used to give =8Bq2.nlR  
physical insight into the process of radiation. Next, the method is o*\Fj}l-  
used to analyze two TEM horns that were previously designed for Ft} h&aYP  
pulse radiation. The geometry and electrical properties of these ~yrEB:w`_  
antennas are more complicated than for the metallic, triangularplate X,
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horn. One has shaped metallic plates with a resistive S5a?KU
  
termination at the open end; the other has plat .. %3ieR}:/e&  
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