FDTD Analysis of Unit-Radiator for a Circularly Polarized Printed Array Antenna Composed of Strips and Slots

Motoyuki NAITO  Shin-ichiro MATSUZAWA  Koichi ITO  

IEICE TRANSACTIONS on Communications   Vol.E77-B   No.12   pp.1621-1627
Publication Date: 1994/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
CP-PASS,  linear element,  FDTD and electromagnetic analysis,  

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The validity of numerical design scheme of CP-PASS (Circularly Polarized Printed Array antenna composed of Strips and Slots) is considered. The strip element of CP-PASS is composed of a strip dipole and a window which increases the frequency bandwidth of the strip element. With the window, however, analysis of the antenna becomes difficult if a simple analytical model is used. The previous design procedure requierd an experimental procedure. By using modern computers, the FDTD (finite-difference time-domain) method becomes powerful tool for the analysis of 3D-structured antennas. In this paper, numerical results of the FDTD analysis for CP-PASS is compared with results from experiments. The characteristics of the unit-radiator of CP-PASS are demonstrated numerically. This paper shows that CP-PASS can be designed numerically and a new path has opened in the study of CP-PASS.