Numerical analysis of a low-profile rectangular spiral antenna

Issue title: ASAEM 2001

Article type: Research Article

Authors: Nakano, H.^a | Okabe, Y.^a | Nakayama, Y.^a | Yamauchi, J.^a

Affiliations: [a] Faculty of Engineering, Hosei University, Koganei, Tokyo, Japan 184-8584. Tel. and Fax: +81 423 87 6183; E-mail: [email protected]

Abstract: This paper describes a rectangular spiral antenna backed by a conducting plane of finite extent. The distance between the spiral and the conducting plane is chosen to be extremely small: 0.07 wavelength at a test frequency of 3 GHz. For analysis, the finite-difference time-domain (FDTD) method is used. The radiation characteristics, including the current distribution, input impedance, radiation pattern, axial ratio, and gain, are revealed and discussed. It is found that absorbing materials inserted into the space between the conducting plane and the peripheral region of the spiral contribute to the wideband frequency characteristics of the axial ratio and input impedance.

DOI: 10.3233/JAE-2002-230

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 129-137, 2002