An Ultracompact Omnidirectional Circularly Polarized Antenna

Huacheng Li, Zhenxin Hu, Wei Lin

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

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.

Original languageEnglish
Title of host publication2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1361-1362
Number of pages2
ISBN (Electronic)9781665442282
DOIs
Publication statusPublished - Jul 2023
Event2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023 - Portland, United States
Duration: 23 Jul 202328 Jul 2023

Publication series

NameIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
Volume2023-July
ISSN (Print)1522-3965

Conference

Conference2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023
Country/TerritoryUnited States
CityPortland
Period23/07/2328/07/23

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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