DocumentCode :
984131
Title :
Low-Cost Broadband Circularly Polarized Printed Antennas and Array
Author :
Gao, Steven ; Qin, Yi ; Sambell, A.
Author_Institution :
Northumbria Univ., Newcastle-Upon-Tyne
Volume :
49
Issue :
4
fYear :
2007
Firstpage :
57
Lastpage :
64
Abstract :
This paper presents the design, simulation, and measurements of two low-cost broadband circularly polarized (CP) printed antennas: an element and an array at 2 GHz. To realize the broadband circularly polarized antenna element, a circular microstrip patch is electromagnetically coupled by crossed slots cut in the ground plane, which is fed by an L-shaped microstrip feed. Two orthogonal modes in the patch are excited by using the crossed slots, and a single L-shaped feed provides a 90deg phase shift between two orthogonal slots. The antenna element achieves a 9.6% bandwidth for an axial ratio (AR) below 3 dB and a voltage standing wave ratio (VSWR) below 1.5. To further improve the performance, a sequentially rotated feed network is designed for a 2 times 2 array. The axial ratio value of the array is below 3 dB within a 27.2% bandwidth, from 1.75 GHz to 2.3 GHz. The return loss is above 10 dB within a 41% bandwidth, from 1.62 GHz to 2.45 GHz. Details of the proposed antenna element and the array design are described, and both the simulation and the experimental results are presented and discussed.
Keywords :
UHF antennas; antenna feeds; broadband antennas; microstrip antenna arrays; L-shaped microstrip feed; antenna array; antenna element; broadband printed antenna; circular microstrip patch; circularly polarized printed antennas; crossed slots feeds; frequency 1.62 GHz to 2.45 GHz; low-cost printed antenna; sequentially rotated feed network; Antenna arrays; Antenna measurements; Bandwidth; Broadband antennas; Electromagnetic measurements; Electromagnetic wave polarization; Feeds; Microstrip antenna arrays; Microstrip antennas; Slot antennas;
fLanguage :
English
Journal_Title :
Antennas and Propagation Magazine, IEEE
Publisher :
ieee
ISSN :
1045-9243
Type :
jour
DOI :
10.1109/MAP.2007.4385597
Filename :
4385597
Link To Document :
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