Offset Beam Planar Antenna Employing Low Loss Triangular Dielectric Phase Shifter

Naoki HONMA  Fumio KIRA  Tamami MARUYAMA  Keizo CHO  Hideki MIZUNO  

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.9    pp.2720-2727
Publication Date: 2003/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
planar antenna,  array antenna,  dielectric phase shifter,  microstrip line,  

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Employing a triangular dielectric phase shifter simplifies the beam forming network of an offset beam array antenna because this structure achieves phase control in a single configuration. This paper proposes a design method for a low loss offset beam planar antenna that incorporates a triangular dielectric plate phase shifter on parallel microstrip feedlines. Our design method reduces the loss of the phase shifter by optimizing the microstrip line width. By using the proposed design equation, the optimum low loss phase shifter configuration can be easily established. In addition, this paper presents the actual design of a triangular plate considering size reduction. The results of experiments of the offset beam antenna indicate that our design method is effective in obtaining a simple, low loss, and compact configuration.