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

Content Provider	IET Digital Library
Author	Park, Donghee Qu, Longyue Kim, Hyeongdong
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 λ 0 × 0.28 λ 0 × 0.008 λ 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.
Starting Page	1509
Ending Page	1514
Page Count	6
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 10, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5098
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-05-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Accessory Antenna Feeds Antenna Radiation Pattern Compact Circularly Polarised Antenna CP Communication CP Wave Radiation Efficiency 55.3 Percent Electromagnetic Wave Polarisation Frequency 2.34 GHz to 2.52 GHz Frequency 2.36 GHz to 2.62 GHz Gain 1 DB Ground Characteristic Mode Ground Mode Tuning Technique Ground Plane Ground Radiation Antenna Element Maximum Radiation Direction Microstrip Antenna Orthogonal Degenerate Ground Mode Single Antenna Small-size Printed Circuit Boards UHF Antenna Wireless LAN Wireless Local Area Network Application
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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