TY - GEN
T1 - An Ultracompact Omnidirectional Circularly Polarized Antenna
AU - Li, Huacheng
AU - Hu, Zhenxin
AU - Lin, Wei
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023/7
Y1 - 2023/7
N2 - An ultracompact omnidirectional circularly polarized (OCP) antenna is presented in this paper. An innovative antenna configuration has been adopted that consists of a full-wavelength folded helical dipole radiator and a closely placed half-wavelength parasitic helical arm. Compared with the conventional single-arm half-wavelength helical OCP antenna, the current density has been significantly enhanced and thus the radiation resistance of this design has been improved substantially from 10 to 43 Ohms. As a result, a good impedance matching is realized. Moreover, very compact physical size has been maintained, i. e., only being π(0.044 λ0)2× 0.088 λ0= 0.0005 λ03 (λ0 is the free-space wavelength at the center frequency). A prototype operating at 915 MHz ISM band has been designed. Simulated results demonstrate that the antenna has a good impedance matching around the targeted 915 MHz and achieves an excellent OCP radiation performance, e. g., the out-of-roundness value of the co-pol radiation pattern is less than 0.2 dB. It is an ideal candidate for IoT applications that requires very compact OCP antenna system.
AB - An ultracompact omnidirectional circularly polarized (OCP) antenna is presented in this paper. An innovative antenna configuration has been adopted that consists of a full-wavelength folded helical dipole radiator and a closely placed half-wavelength parasitic helical arm. Compared with the conventional single-arm half-wavelength helical OCP antenna, the current density has been significantly enhanced and thus the radiation resistance of this design has been improved substantially from 10 to 43 Ohms. As a result, a good impedance matching is realized. Moreover, very compact physical size has been maintained, i. e., only being π(0.044 λ0)2× 0.088 λ0= 0.0005 λ03 (λ0 is the free-space wavelength at the center frequency). A prototype operating at 915 MHz ISM band has been designed. Simulated results demonstrate that the antenna has a good impedance matching around the targeted 915 MHz and achieves an excellent OCP radiation performance, e. g., the out-of-roundness value of the co-pol radiation pattern is less than 0.2 dB. It is an ideal candidate for IoT applications that requires very compact OCP antenna system.
UR - http://www.scopus.com/inward/record.url?scp=85172421891&partnerID=8YFLogxK
U2 - 10.1109/USNC-URSI52151.2023.10237485
DO - 10.1109/USNC-URSI52151.2023.10237485
M3 - Conference article published in proceeding or book
AN - SCOPUS:85172421891
T3 - IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
SP - 1361
EP - 1362
BT - 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023
Y2 - 23 July 2023 through 28 July 2023
ER -