Compact Normal-Mode Hybrid-Helix Antenna and Its Application to Circularly Polarized Yagi Array

Autor:	Zhenxin Hu, Gary Zhang, Zhuozhu Chen, Chunbing Guo, Jun Zhang
Rok vydání:	2021
Předmět:	Physics business.industry Axial ratio Polarization (waves) Antenna efficiency law.invention Optics law Helical antenna Dipole antenna Electrical and Electronic Engineering Antenna (radio) business Electrical impedance Circular polarization
Zdroj:	IEEE Transactions on Antennas and Propagation. 69:5986-5991
ISSN:	1558-2221 0018-926X
DOI:	10.1109/tap.2021.3069515
Popis:	This communication presents a compact normal-mode hybrid-helix antenna of circular polarization and its Yagi array configuration. By cascading two types of helices with different turn spacings and radii, the hybrid-helix antenna element effectively alleviates the limitation of the traditional normal-mode helix antenna that is challenging to simultaneously achieve circular polarization and high radiation efficiency. The proposed hybrid antenna element is also further extended for a Yagi array to obtain the endfire circular polarization. For experimental verification, the hybrid-helix array is fabricated using the selective laser melting (SLM) technique. Measured results agree well with simulated ones, showing that the impedance of the normal-mode helix array can cover the 10 dB impedance bandwidth from 2.27–2.47 GHz, and the axial ratio of less than 3 dB and the radiation efficiency of higher than 90% can be achieved within the whole operating bandwidth.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::adf5137971a4fe7d646040b0175bf49f https://doi.org/10.1109/tap.2021.3069515 Zobrazit plný text záznamu