Effect of Dimension of Conducting Box on Radiation Pattern of a Monopole Antenna for Portable Telephone

Ryo YAMAGUCHI  Kunio SAWAYA  Yoshiyuki FUJINO  Saburo ADACHI  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.12   pp.1526-1531
Publication Date: 1993/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on 1992 Internatioal Symposium on Antennas and Propagation)
mobile communication,  portable telephone,  Galerkin-moment method,  Fourier series expansion,  monopole antenna,  

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The relation between the radiation pattern and the dimension of the conducting box for a portable telephone is illustrated both theoretically and experimentally. The Galerkin-moment method using the Fourier series expansion for the surface current of the conducting box, which has a great advantage of having a high accuracy, is employed to obtain the radiation pattern. As an example of antennas, a quarter-wavelength monopole antenna having a sinusoidal current distribution is used. As a result, it is pointed out that the radiation pattern of a monopole antenna mounted on the box tends to tilt in a lower direction both in theory and in experiment as well. The relation between the radiation pattern and the location of the monopole antenna is also described. An asymmetrical, or distorted pattern is observed when the monopole antenna moves away from the center of the top plane.