A microstrip-fed quasi-spiral circularly polarized ultra-wideband antenna

Author

Shen, Yizhu ; Law, Choi Look

Author_Institution

Positioning & Wireless Technol. Centre, Nanyang Technol. Univ., Singapore, Singapore

fYear

2011

fDate

3-8 July 2011

Firstpage

1463

Lastpage

1466

Abstract

A circularly polarized (CP) quasi-spiral antenna for ultra-wideband (UWB) applications is proposed in this paper. By carefully choosing the offset feeding point and adopting an impedance transformer, the developed quasi-spiral antenna can be directly fed by a microstrip tapered line. The measured 10-dB return loss bandwidth and 3-dB axial-ratio (AR) bandwidth are 72.4% (5.15 to 11 GHz) and 44.3% (6.37 to 10 GHz), respectively. The measured antenna gain is about 3 dBi. Moreover, it can realize almost omni-directional radiation covering the upper UWB frequency range (7 - 10 GHz).

Keywords

antenna feeds; microstrip antennas; omnidirectional antennas; ultra wideband antennas; 3-dB axial-ratio bandwidth; UWB antenna; frequency 5.15 GHz to 11 GHz; frequency 6.37 GHz to 10 GHz; impedance transformer; microstrip-fed quasi-spiral circularly polarized ultra-wideband antenna; offset feeding point; omnidirectional radiation; Antenna feeds; Antenna measurements; Bandwidth; Microstrip; Microstrip antennas; Spirals; Microstrip-fed; circular polarization; spiral antenna; ultra-wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on

Conference_Location

Spokane, WA

ISSN

1522-3965

Print_ISBN

978-1-4244-9562-7

Type

conf

DOI

10.1109/APS.2011.5996570

Filename

5996570