Pattern Synthesis from Dielectric Rod Waveguides with Variation Sections Considering Surface Variation Sizes

Hiroshi KUBO  Masayuki MATSUSHITA  Ikuo AWAI  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.184-191
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Antenna (Dielectric)
dielectric antennas,  pattern synthesis,  wave source distribution,  genetic algorithms,  

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The radiation patterns are synthesized by properly disposing surface variations on dielectric rod waveguides. The genetic algorithm (GA) is applied for searching the optimum disposition of variation sections. A very fast calculation method used in the optimization is presented. The guided waves are related in the form of a 2-port circuit and the radiation field is expressed by superposition of the waves from variation sections. Various conical beams can be synthesized. Short variation sections and combination of several variation sections with different height are used to improve the synthesis performance. The ripple of the mainlobe and the sidelobe levels become small. Spherical sector patterns with a steep fall are synthesized and the agreement with the experimental values is confirmed.