Circularly Polarized Ultra-Wideband Antenna for Dependable Wireless Localization Systems

This paper presents the design of an Archimedean Spiral Antenna (ASA) for use in an indoor localization system. The ultra wideband antenna operates in the frequency range between 3 and 7 GHz and achieves a gain higher than 2.87 dB and axial ratio lower than 3 dB with a Half Power Beamwidth of 90.5°. With the addition of a loading ring, the antenna presents a size reduction of 30% in comparison traditional Archimedean Spiral Antennas.