Broadband Design of Circularly Polarized Microstrip Patch Antenna Using Artificial Ground Structure With Rectangular Unit Cells

Author

Nakamura, Teruhisa ; Fukusako, Takeshi

Author_Institution

Dept. of Comput. Sci. & Electr. Eng., Kumamoto Univ., Kumamoto, Japan

Volume

59

Issue

6

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

2103

Lastpage

2110

Abstract

This paper presents a broadband circularly polarized patch antenna using an artificial ground (AG) structure with rectangular unit cells as a reflector. The AG structure changes the reflection phase in accordance with the polarization state of the incident wave. By properly combining the transmitted wave from the antenna and the reflected wave from the AG structure, broadband circular polarization can be obtained. The AG structure and the antenna are simulated using a full-wave solver and the results show a 10 dB return loss bandwidth of 48.6% and a 3 dB axial ratio bandwidth of 20.4%. The measured results are in good agreement with the simulated results. The radiation characteristics of the antenna are almost the same as those for an antenna with a PEC reflector.

Keywords

broadband antennas; microstrip antennas; polarisation; reflector antennas; PEC reflector; antenna radiation characteristics; artificial ground structure; broadband circular polarization; broadband design; circularly polarized microstrip patch antenna; full-wave solver; incident wave; loss 10 dB; polarization state; rectangular unit cell; reflected wave; transmitted wave; Bandwidth; Impedance; Microstrip; Microstrip antennas; Patch antennas; Periodic structures; Artificial ground (AG) structure; artificial magnetic conductor (AMC); axial ratio; broadband antenna; circular polarization; microstrip antennas;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2011.2143656

Filename

5751643