Leaky Wave Antenna Based on Evanescent-Mode Left-Handed Transmission Lines Composed of a Cut-Off Parallel-Plate Waveguide Loaded with Dielectric Resonators

Tetsuya UEDA
Naobumi MICHISHITA
Anthony LAI
Tatsuo ITOH

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.9    pp.1770-1775
Publication Date: 2007/09/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.9.1770
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Antennas/Systems
Keyword: 
leaky wave antenna,  left-handed transmission lines,  dielectric resonators,  parallel-plate waveguides,  

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Summary: 
Leaky wave radiation from evanescent-mode left-handed (LH) transmission lines is investigated that are composed of a cut-off parallel plate waveguide loaded with a one-dimensional (1-D) array of the disc type dielectric resonators. The apertures are placed on side walls of the parallel plate waveguide. First of all, the dispersion diagram is numerically obtained with the complex eigenmode solutions. The simulated and measured backward wave radiation characteristics validate the backward wave propagation along the 1-D waveguides. Based on the concept, the backfire leaky wave antenna was designed and demonstrated with the 15-cell structure. The beam scanning with the operational frequency was achieved by more than 30 degrees.