Broadband C-Shaped Circularly Polarized Monopole Antenna

Author

Kang Ding ; Cheng Gao ; Tongbin Yu ; Dexin Qu

Author_Institution

Nat. Key Lab. on Electromagn. Environ. Effects & Electro-Opt. Eng., PLA Univ. of Sci. & Technol., Nanjing, China

Volume

63

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

785

Lastpage

790

Abstract

A novel broadband monopole antenna with circular polarization (CP) is designed and fabricated. It consists of a C-shaped monopole, an open-loop on the backside of the monopole and a modified ground plane. By placing a rectangular open-loop coplanar with the ground plane and connecting a rectangular vertical stub to the ground plane, wide impedance bandwidth is achieved, and axial-ratio (AR) bandwidth of the antenna could be improved simultaneously. The measured results exhibit a 65.2% (4.14 GHz, 4.28-8.42 GHz) CP bandwidth, and the 10-dB impedance bandwidth is 87.7% (6.66 GHz, 4.26-10.92 GHz). Finally, by placing a reflector underneath the antenna with its structural dimensions unchanged, one can obtain unidirectional radiation patterns with greatly improved gains. The advantages of the proposed antenna are the simple structure, a compact size, and a broad 3-dB AR bandwidth.

Keywords

antenna radiation patterns; broadband antennas; microwave antennas; monopole antennas; reflector antennas; CP; axial-ratio bandwidth; bandwidth 4.14 GHz; broadband C-shaped circularly polarized monopole antenna; frequency 4.26 GHz to 10.92 GHz; frequency 6.66 GHz; impedance bandwidth; modified ground plane; rectangular open-loop coplanar; rectangular vertical stub; reflector antenna; structural dimensions; unidirectional radiation patterns; Antenna measurements; Bandwidth; Broadband antennas; Frequency measurement; Impedance; Reflector antennas; Axial-ratio (AR); broadband; circularly polarized (CP); monopole antenna;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2014.2380437

Filename

6983601