A Beam Adjustable Leaky-Wave Antenna Using a Moveable Dielectric Slab inside a Waveguide

Cherng-Chyi HSIAO  Ruey Bing HWANG  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.12   pp.2250-2257
Publication Date: 2005/12/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.12.2250
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Wireless Technologies and Computational Electromagnetics)
Category: Antenna Design
beam adjustable,  leaky-wave antenna,  dielectric slab,  waveguide,  

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In this paper, we presented a beam adjustable antenna made up of a slit waveguide and a dielectric slab. In order to change the radiation main-beam angle, we changed the phase constant of the waveguide mode by inserting a dielectric slab for perturbing its field distribution. The direction of radiation main-beam can be steered by dynamically changing the position of the dielectric slab. For the theoretical analysis, the dispersion relation, including the phase and attenuation constants, was determined by solving the transverse resonance equation. An agreement between the theoretical and experimental radiation pattern verifies the beam-steering mechanism. Up to 23beam-steering angle can be achieved using this approach.