[天线]27 The Folded Horn Antenna

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 55, NO. 11, NOVEMBER 2007 t`A5wqm  
The Folded Horn Antenna c::Vh  
Everett G. Farr, Leland H. Bowen, Carl E. Baum, and HoKN<w  
William D. Prather `LVX|l62  
Abstract—Antennas for radiating high-power mesoband (medium-bandwidth)
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electromagnetic signals are critical to the mission of upsetting electronics 0CUUgwA/  
at a distance. When operated at frequencies of a few hundred megahertz, C$EvcF%1  
RF weapons require highly efficient antennas that can fit into a small n!\&X9%[8  
volume. Most of the existing antennas, such as pyramidal horns, are too '=m ?l  
large to fit onto certain platforms of interest. To address this challenge, Yy8%vDdJO  
we investigate the folded horn, which has aperture dimensions of 0.5 2 jhSc9  
wavelengths, and a depth of 1.5–2 wavelengths. This antenna has a nearly jo
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focused aperture field, due to a parabolic fold in the H-plane. We report imf_@_  
here on the fabrication and testing of the first folded horn, operating at 2<5s0GT'/  
3 GHz. After a number of iterations, we obtained a realized gain of at least 3`m n#RM  
10 dBi over 3–5 GHz, an aperture efficiency of 80%, and a return loss below 7~ok*yGw  
10 dB over 2.8–3.35 GHz. This design could be adapted to high voltages, xBMhk9b^0  
and it could work well in a 2-antenna array, with two antennas positio .. YPsuG -is  
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