High-Temperature Superconducting Small Helical Antenna

Keiichiro ITOH  Osamu ISHII  Yasuhiro KOSHIMOTO  Keizo CHO  

IEICE TRANSACTIONS on Electronics   Vol.E75-C   No.2   pp.246-251
Publication Date: 1992/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
superconductive electronics,  antennas,  

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To realize a highly efficient small antenna, high-Tc superconductors are adopted to fabricate both a self-resonating helical radiator and a quarter-wave matching circuit. The actual gain and bandwidth measured at 478 MHz using a 1/45-wavelength radiator were respectively 1.5 dBi and 0.35%, indicating that this type of antenna has a high radiation efficiency and a fairly wide bandwidth. It is also confirmed through experiments and theoretical simulations that a decrease in the surface resistance of the radiator more effectively improves the radiation efficiency than a decrease in the surface resistance of the matching circuit.