[天线]27 The Folded Horn Antenna

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 55, NO. 11, NOVEMBER 2007 [}p/pj=  
The Folded Horn Antenna h5@v:4Jjo~  
Everett G. Farr, Leland H. Bowen, Carl E. Baum, and R 2.y=P8N  
William D. Prather #~ikR.-+Eq  
Abstract—Antennas for radiating high-power mesoband (medium-bandwidth) z'iAj  
electromagnetic signals are critical to the mission of upsetting electronics Z]Zs"$q@  
at a distance. When operated at frequencies of a few hundred megahertz, IvJ;9d  
RF weapons require highly efficient antennas that can fit into a small ]{2Eo  
volume. Most of the existing antennas, such as pyramidal horns, are too &RSUB;ymL  
large to fit onto certain platforms of interest. To address this challenge, q ERdQ~M,  
we investigate the folded horn, which has aperture dimensions of 0.5 2 RDFOUqS  
wavelengths, and a depth of 1.5–2 wavelengths. This antenna has a nearly {3V%  
focused aperture field, due to a parabolic fold in the H-plane. We report 8Xo`S<8VS  
here on the fabrication and testing of the first folded horn, operating at >9?BJv2  
3 GHz. After a number of iterations, we obtained a realized gain of at least G{4~{{tI  
10 dBi over 3–5 GHz, an aperture efficiency of 80%, and a return loss below D7'P^*4_B  
10 dB over 2.8–3.35 GHz. This design could be adapted to high voltages, FNQR sNi  
and it could work well in a 2-antenna array, with two antennas positio .. IUK!b2!`  
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