[天线]18 On the Characteristic Impedance of the TEM Horn Antenna

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 52, NO. 1, JANUARY 2004 315 v/c]=/  
Coommunications____________________________________________________________________ 1VlU'qY  
On the Characteristic Impedance of the TEM Horn Antenna ~vt9?(h  
R. Todd Lee and Glenn S. Smith /}m*|cG/  
Abstract—Some time ago, Carrel presented an analytical formula, based vBl:&99[/  
on conformal mapping, for the characteristic impedance of the transverse 60u_,@rV  
electromagnetic horn antenna [1]. Later, results from this formula were a~$Y;C_#<  
shown to be in error, and Lambert et al. offered a new analytical formula, p ZTrh&I]  
also based on conformal mapping [2]. This formula also contains an error s) shq3O  
that is easily corrected. Independently, Yang and Lee offered an analytical aYb97}kI  
formula [3]. In this paper, we compare these analytical formulas to a direct X]D,kKasG  
numerical solution. Finally, we compare the “microstrip approximation” ~;#}aQYo  
for the characteristic impedance to the exact solution. Graphs are presented G#7(6:=;,`  
for the characteristic impedance versus the angles of the horn that should ^.!jD+=I  
be usef .. WXY'%G  
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