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Compact circularly polarised antenna utilising the radiation of the ground plane based on the theory of characteristic modes

Title
Compact circularly polarised antenna utilising the radiation of the ground plane based on the theory of characteristic modes
Author
Keywords
antenna radiation patterns; microstrip antennas; electromagnetic wave polarisation; antenna feeds; UHF antennas; wireless LAN; compact circularly polarised antenna; ground plane; wireless local area network applications; small-size printed circuit boards; orthogonal degenerate ground modes; ground radiation antenna element; CP wave radiation; ground mode tuning technique; maximum radiation direction; ground characteristic modes; CP communication; frequency 2; 36 GHz to 2; 62 GHz; frequency 2; 34 GHz to 2; 52 GHz; gain 1 dB; efficiency 55; 3 percent
Issue Date
2019-08
Publisher
INST ENGINEERING TECHNOLOGY-IET
Citation
IET MICROWAVES ANTENNAS & PROPAGATION, v. 13, no. 10, Page. 1509-1514
Abstract
This research proposes a single-fed circularly polarised (CP) antenna operating at 2.4 GHz for wireless local area network applications by utilising ground radiation, which is particularly applicable to small-size printed circuit boards (PCBs) such as the Internet of Things (IoT) devices. To simultaneously excite two orthogonal degenerate ground modes for CP wave radiation, ground mode tuning (GMT) technique is further adopted to adjust the resonant frequencies of the two ground modes. The proposed small antenna element is located at an optimum position of the PCB based on the analysis of the theory of characteristic modes for simultaneously exciting two ground characteristic modes. Experiments verify good performances with the compact size of 0.28 ${\rm \lambda }_0$lambda 0 x 0.28 ${\rm \lambda }_0$lambda 0 x 0.008 ${\rm \lambda }_0$lambda 0 (including the ground plane and antenna element) at 2.45 GHz. The proposed antenna achieves 3 dB axial ratio bandwidth of 10.6% (2.36-2.62 GHz) and -6 dB impedance bandwidth of 7.4% (2.34-2.52 GHz). The measured efficiency of the proposed antenna is 55.3%, and the direction of the maximum radiation for LHCP and RHCP is + z and - z, respectively. The measured gain is 1 dBi at 2.45 GHz. The proposed antenna applies to small-size PCBs for CP communication, which is desirable for practical wireless products.
URI
https://ieeexplore.ieee.org/document/8786954https://repository.hanyang.ac.kr/handle/20.500.11754/152658
ISSN
1751-8725; 1751-8733
DOI
10.1049/iet-map.2018.5098
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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