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A feeding technique for wideband CP patch antenna based on 90° phase difference between tapped-line and parallel coupled-line
Qiong-Sen Wu1,2; Xiao Zhang2,3; Lei Zhu3
2019-07
Source PublicationIEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
ISSN1536-1225
Volume18Issue:7Pages:1468 - 1471
Abstract

A feeding technique for wideband circularly polarized (CP) patch antenna based on the 90° phase difference between tapped line and parallel coupled line in a feeding network is proposed. The tapped line and parallel coupled line are equivalently regarded as a direct coupling element with 0° phase delay and a J-inverter coupling element with 90° phase delay, respectively. In design, two identical λ/2 resonators are employed to excite two orthogonal modes for wideband equal magnitude. Meanwhile, the feeding lines are tapped and coupled to the two resonators, and tapped line and coupled line can inherently provide 90° phase difference as demanded for CP radiation with no need for an additional delay line or a phase shifter. The whole structure is modeled as an equivalent three-port network, and the theoretical axial ratio (AR) is calculated with the magnitude and phase of the voltage at the radiation conductance. Since two minima in AR response emerge, this proposed patch antenna can achieve a wide AR bandwidth. The theoretical performance is finally verified by a fabricated CP patch antenna prototype with a profile of 0.042λ0, and the 3 dB AR fractional bandwidth is 7.07%.

KeywordCircular Polarization Tapped Line Wideband Parallel Coupled Line Patch Antenna
DOIhttp://doi.org/10.1109/LAWP.2019.2920256
Language英语
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Document TypeJournal article
CollectionFaculty of Science and Technology
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorLei Zhu
Affiliation1.the School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
2.the Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macau
3.the ATR National Key Laboratory of Defense Technology, College of Information Engineering, Shenzhen University, Shenzhen 518060, China
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Qiong-Sen Wu,Xiao Zhang,Lei Zhu. A feeding technique for wideband CP patch antenna based on 90° phase difference between tapped-line and parallel coupled-line[J]. IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS,2019,18(7):1468 - 1471.
APA Qiong-Sen Wu,Xiao Zhang,&Lei Zhu.(2019).A feeding technique for wideband CP patch antenna based on 90° phase difference between tapped-line and parallel coupled-line.IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS,18(7),1468 - 1471.
MLA Qiong-Sen Wu,et al."A feeding technique for wideband CP patch antenna based on 90° phase difference between tapped-line and parallel coupled-line".IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 18.7(2019):1468 - 1471.
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