Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system

UM > Faculty of Science and Technology > DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING

Status	已發表Published
	Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system
	Zhang, W.-H.; Tam, K. W.; Lu, W.-J.; Cheong, P.; Choi, W. W.; Ho, S. K.
	2020-02-24
Source Publication	International Journal of RF and Microwave Computer‐Aided Engineering
ISSN	1099-047X
Pages	e22198-e22198
Abstract	A tilted bi‐sense circularly polarized (CP) antenna and its application for UHF radio frequency identification (RFID) system is proposed. A planar concial monopole working as the electric dipole is designed at first. When a shorting pin is added, a loop radiator would be generated, and thus a pair of orthogonally oriented complementary dipoles is realized. In this way, both right‐handed circularly polarized (RHCP) and left‐handed circularly polarized waves (LHCP) are generated simultaneously in tilted directions within one hemisphere. Then, closed‐form formulas are derived to reveal the tunability mechanism of bi‐sense property and provide a design guideline for system application. It is demonstrated that flare angle of conical monopole has a linear relationship and sine function to CP beam direction and 3‐dB axial ratio (AR) beamwidth, respectively. Finally, antenna prototypes are fabricated and tested for validation. It is also demonstrated that at the tilted direction of θ = ± 45°, a 3‐dB AR bandwidth of 4.9%, and gain up to 5 dB are realized. Comparing with conventional microstrip patch antenna, an enhanced reading range over 5 m can be obtained in the tilted range from 40° to 75° and − 75° to −40° in UHF RFID sytem application.
Keyword	bi‐sense beam circularly polarized antenna complementary dipoles RFID system tilting beams
URL	View the original
Language	英語English
The Source to Article	PB_Publication
PUB ID	51571
Document Type	Journal article
Collection	DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING Faculty of Science and Technology
Recommended Citation GB/T 7714	Zhang, W.-H.,Tam, K. W.,Lu, W.-J.,et al. Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system[J]. International Journal of RF and Microwave Computer‐Aided Engineering, 2020, e22198-e22198.
APA	Zhang, W.-H.., Tam, K. W.., Lu, W.-J.., Cheong, P.., Choi, W. W.., & Ho, S. K. (2020). Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system. International Journal of RF and Microwave Computer‐Aided Engineering, e22198-e22198.
MLA	Zhang, W.-H.,et al."Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system".International Journal of RF and Microwave Computer‐Aided Engineering (2020):e22198-e22198.

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