TY - JOUR
T1 - Omnidirectional circularly polarized antenna based on counter-wound helices
AU - Hu, Zhenxin
AU - Lin, Wei
AU - Chen, Zhuozhu
AU - Wang, Wenwei
AU - Wang, Shiyan
AU - Li, Jianfeng
AU - Al-Sheikh, Ali
N1 - Funding Information:
Manuscript received June 28, 2020; revised December 31, 2020; accepted January 21, 2021. Date of publication March 1, 2021; date of current version August 4, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61901125 and 61901126 and in part by the Key-Field Research Program of Guangdong Province under Grant 2018B010115001. (Corresponding author: Jianfeng Li.) Zhenxin Hu is with the School of Automation, Guangdong University of Technology, Guangzhou 510006, China, and also with the State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China (e-mail: [email protected]).
Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 61901125 and 61901126 and in part by the Key-Field Research Program of Guangdong Province under Grant 2018B010115001. The authors would like to thank Dr. Yunfei Cao from South China University of Technology for his assistance on measurement of the antenna.
Publisher Copyright:
© 2021 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
PY - 2021/8
Y1 - 2021/8
N2 - An innovative counter-wound helical antenna with omnidirectional circular polarization (OCP) is reported in this communication, with a significantly enhanced radiation resistance and matching bandwidth compared with the conventional normal-mode CP helix counterpart. The antenna is realized by combining several helical radiators with opposite winding directions. A three-segment OCP counter-wound helix is studied, featuring one right-handed helix in the middle and two left-handed helices sandwiching it from the top and the bottom. Besides achieving a stable OCP pattern with gain variations of less than 0.2 dB, the radiation resistance at the operating frequency f0 is increased to 26.7 Ω compared with 3.3 Ω of the traditional uniform-wound helix. Theoretical analysis and simulations are presented. To further enhance the radiation resistance, a five-segment helical antenna prototype is demonstrated and tested. The radiation resistance rises further to 80.9 Ω at f0 and the measured matching bandwidth reaches 2.8%, surpassing that of the conventional OCP helix by four times. Stable OCP radiation with a realized gain of up to 2.5 dBic is observed. Being compact and simple, the developed helical antenna could represent an ideal candidate for various wireless applications, for example, device-to-device (D2D) communications that require OCP radiations.
AB - An innovative counter-wound helical antenna with omnidirectional circular polarization (OCP) is reported in this communication, with a significantly enhanced radiation resistance and matching bandwidth compared with the conventional normal-mode CP helix counterpart. The antenna is realized by combining several helical radiators with opposite winding directions. A three-segment OCP counter-wound helix is studied, featuring one right-handed helix in the middle and two left-handed helices sandwiching it from the top and the bottom. Besides achieving a stable OCP pattern with gain variations of less than 0.2 dB, the radiation resistance at the operating frequency f0 is increased to 26.7 Ω compared with 3.3 Ω of the traditional uniform-wound helix. Theoretical analysis and simulations are presented. To further enhance the radiation resistance, a five-segment helical antenna prototype is demonstrated and tested. The radiation resistance rises further to 80.9 Ω at f0 and the measured matching bandwidth reaches 2.8%, surpassing that of the conventional OCP helix by four times. Stable OCP radiation with a realized gain of up to 2.5 dBic is observed. Being compact and simple, the developed helical antenna could represent an ideal candidate for various wireless applications, for example, device-to-device (D2D) communications that require OCP radiations.
KW - Circularly polarized antenna
KW - Helical antennas
KW - High gain
KW - Omnidirectional radiation
KW - Radiation resistance
KW - Wideband
UR - http://www.scopus.com/inward/record.url?scp=85102318660&partnerID=8YFLogxK
U2 - 10.1109/TAP.2021.3061011
DO - 10.1109/TAP.2021.3061011
M3 - Journal article
AN - SCOPUS:85102318660
SN - 0018-926X
VL - 69
SP - 5042
EP - 5047
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 8
M1 - 9366343
ER -