A Linearly and Circularly Polarized Double-Band Cross Spiral Antenna

Mayumi MATSUNAGA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E99-B   No.2   pp.430-438
Publication Date: 2016/02/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
spiral antennas,  multi-polarized antennas,  circularly polarized antennas,  loop antennas,  folded dipole antennas,  

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Summary: 
A novel circularly and linearly polarized loop antenna is presented. A simple loop configuration, twisted like a cross shape, has achieved radiating wide beam circular polarization simultaneously with linear polarization in two close bands. This cross configuration brings good circular polarization to a loop antenna because it uses the transmission line mode of a folded dipole antenna. For these reasons, the antenna is named the Cross Spiral Antenna (CSA). In this paper, a basic structure and the principle of the CSA radiating circular polarization with one port feeding is explained. The prototype CSA, which is tuned to around 1.57GHz and 1.6GHz, is tested for verifying the effectiveness of the suggested antenna configuration.