[天线]9 A design study for the basic TEM horn antenna

A Design Study for the pImq<Z  
Basic TEM Horn Antenna
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R. Todd Lee and Glenn S. Smith jy~hLEt7  
School of Electrical and Computer Engineering, Georgia Institute of Technology .~I:Hcf/  
Atlanta, GA 30332-0250 USA Wg%]  
Tel: +(I4 04) 894-2922; Fax: +(I4 04) 894-4641 iJh{,0))g  
E-mail: todd.lee@ieee.org; glenn.smith@ece.gatech.edu "d-vs t5  
Keywords: Horn antennas; design methodology; antenna radiation patterns; antenna theory |34k;l]E  
1. Introduction (;g/
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Th e transverse electromagnetic (TEM) horn antenna is a popu- lar broadband antenna. The basic antenna is a simple design, r2f%E:-0G  
consisting only of two triangular metal plates and a feeding structure. JVg}XwR  
Neglecting the feeding structure for the moment, the horn is ~<u\
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described completely by only three variables: a , p, and s. As n=b!c@f4  
shown in Figure 1, a is the angular width of each plate, p is the i+S%e,U*  
angular separation between the two plates, and s is the length, 15_"U+O(/  
measured from the drive point to a comer of the plate. *As"U99(  
Much of the previous research has focused on modifying the 1g=T"O&=  
antenna’s structure to improve the performance. These modifications <,O|fY%  
include resistive loading along the plates [ I , 21 and shaping v3[ZPc;;  
of the plates [3]. What is interesting is that there is very little ~Q"qz<WO  
design information available for the hasic TEM horn, as compared b:9"nALgC  
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