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High frequency characteristics of the two wire rhombic illuminator

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3 Author(s)
Donohoe, J.P. ; Dept. of Electr. & Comput. Eng., Mississippi State Univ., MS, USA ; Taylor, C.D. ; Prather, W.D.

The high frequency performance characteristics of a two-wire rhombic illuminator under common-mode excitation are studied using the Numerical Electromagnetics Code (NEC-2). The electrical length of the overwall wire structure ranges from approximately 700 wavelengths at 500 MHz to approximately 1400 wavelengths at 1 GHz. Efficient segmentation schemes are required to extend the analysis up to 1 GHz. The rhombic illuminator radiates more effectively as the frequency of operation is increased from 500 MHz to 1 GHz. Based on the resulting damping characteristic of the rhombic illuminator wire current at these frequencies, only a portion of the wire structure must be modeled. This technique allows one to analyze such a structure efficiently at very high frequencies. The general characteristics of the antenna impedance, wire currents, and radiated fields are discussed

Published in:

Electromagnetic Compatibility, 1993. Symposium Record., 1993 IEEE International Symposium on

Date of Conference:

9-13 Aug 1993