[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 vb.`rj6  
Coommunications____________________________________________________________________ 9f4#b8  
On the Characteristic Impedance of the TEM Horn Antenna cx8H.L  
R. Todd Lee and Glenn S. Smith `cr.C|RT:  
Abstract—Some time ago, Carrel presented an analytical formula, based 7L:$Amb_F  
on conformal mapping, for the characteristic impedance of the transverse ou@ P#:<B  
electromagnetic horn antenna [1]. Later, results from this formula were r'q9N  
shown to be in error, and Lambert et al. offered a new analytical formula, :bgi*pR{  
also based on conformal mapping [2]. This formula also contains an error obE_`u l#  
that is easily corrected. Independently, Yang and Lee offered an analytical b1;80P/:D  
formula [3]. In this paper, we compare these analytical formulas to a direct DjjG
?(1  
numerical solution. Finally, we compare the “microstrip approximation” Q04iuhDO:  
for the characteristic impedance to the exact solution. Graphs are presented @kLpK  
for the characteristic impedance versus the angles of the horn that should daZY;_{"o  
be usef .. [Hww3+~+  
b|*A%?m  

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