Circularly Polarized Ring-Patch Antenna

Author

Chang, The-Nan ; Lin, Jyun-Ming

Author_Institution

Dept. of Electr. Eng., Tatung Univ., Taipei, Taiwan

Volume

11

fYear

2012

fDate

7/4/1905 12:00:00 AM

Firstpage

26

Lastpage

29

Abstract

A method is presented to enhance the flat-gain, the return-loss, and the axial-ratio bandwidths of a probe-fed circularly polarized (CP) microstrip patch antenna. The antenna occupies a volume of 124 × 117 × 33.2 mm³ (the ground plane is excluded). Bandwidths are widened by making use of an opposite shift on the inner and outer contours of a stacked ring, at an equal distance relative to the patch´s boundary. The antenna is implemented in the ultrahigh frequency band for the radio frequency identification (RFID) system. The measured 10-dB return-loss bandwidth is 16.4% (835-975 MHz), and the 3-dB axial-ratio bandwidth is 7.7% (870-940 MHz). The gain is about 7 dBic within the overlapped bandwidth.

Keywords

microstrip antennas; polarisation; radiofrequency identification; RFID; axial ratio bandwidth; circular polarization ring; microstrip patch antenna; radiofrequency identification; return loss; Antenna measurements; Bandwidth; Gain; Gain measurement; Microstrip; Microstrip antennas; Microstrip antennas; patch antennas;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2182174

Filename

6119189