Optimization of the TEM feed structure for four-arm reflector impulse radiating antennas

Author

Tyo, J. Scott

Author_Institution

Dept. of Electr. & Comput. Eng., US Naval Postgraduate Sch., Monterey, CA, USA

Volume

49

Issue

4

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

607

Lastpage

614

Abstract

This paper considers the optimization of the feed arm geometry of four-arm crossed-coplanar plate impulse radiating antennas (IRAs) when the angular position and extent of the arms are taken as free parameters. Previously, optimization of this class of antenna considered only the symmetric case where the two pairs of crossed feed arms were perpendicular to each other. Comparison is made using the prompt aperture efficiency, and the results indicate that the efficiency of four-arm IRAs can be increased from ~25% for the perpendicularly crossed arms to ~35% for the optimum configuration. In addition to the optimization, the feed impedance of coplanar feeds is presented for general values of feed arm angle and plate width, and the optimum feed impedance is computed for each feed arm angle. The results can be used to design the optimal four-arm IRA with an arbitrary specified input impedance

Keywords

electric impedance; optimisation; reflector antenna feeds; reflector antennas; TEM feed structure optimization; angular position; aperture efficiency; coplanar feeds; crossed feed arms; crossed-coplanar plate antennas; feed arm angle; four-arm reflector impulse radiating antennas; optimum feed impedance; perpendicularly crossed arms; plate width; reflector antenna; Antenna feeds; Apertures; Arm; Electromagnetic radiation; Impedance; Performance gain; Reflector antennas; Ultra wideband antennas; Ultra wideband technology; Voltage;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.923322

Filename

923322