Summary
International Symposium on Antennas and Propagation
2006
Session Number:1POS
Session:
Number:1POS-6
Two Resistors Loaded Ultra-Wideband Small Spiral Antenna Backed by a Cavity
Satoshi Yamaguchi, Hiroaki Miyashita, Kazushi Nishizawa, Kenichi Kakizaki, Shigeru Makino,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
Spiral antennas have ultra-wideband characteristics such as a nearly constant input impedance, antenna gain, and low axial ratio. However, when a reflector such as a conducting plane or a cavity is used, its performances are degraded due to the reflections from the end of the spiral arms. In particular this effect is remarkable at low frequencies where the antenna becomes small in comparison to the wavelength. In this paper, we propose a new type of small spiral antenna which has a pair of resistors and experimentally verify its ultra-wideband characteristics.