[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 ;bZ*6-\!-  
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On the Characteristic Impedance of the TEM Horn Antenna j#t8Krd] "  
R. Todd Lee and Glenn S. Smith ]31XX=  
Abstract—Some time ago, Carrel presented an analytical formula, based Ch"8cl;Fm  
on conformal mapping, for the characteristic impedance of the transverse  /;6@M=6u  
electromagnetic horn antenna [1]. Later, results from this formula were Wxau]uix  
shown to be in error, and Lambert et al. offered a new analytical formula, siYRRr  
also based on conformal mapping [2]. This formula also contains an error e8mbEC(AK  
that is easily corrected. Independently, Yang and Lee offered an analytical 2Fgt)`{!  
formula [3]. In this paper, we compare these analytical formulas to a direct f\|?_k]  
numerical solution. Finally, we compare the “microstrip approximation” orH0M!OtS!  
for the characteristic impedance to the exact solution. Graphs are presented Ir"Q%>K0f  
for the characteristic impedance versus the angles of the horn that should H~ n~5 sF"  
be usef .. qO{ ZZ*  
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