Open AccessDual‐curl antennas for broadband circular polarisation
Author(s) -
Hirose K.,
Nakatsu M.,
Nakano H.
Publication year - 2021
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/ell2.12191
Subject(s) - standing wave ratio , axial ratio , physics , broadband , ground plane , optics , bandwidth (computing) , antenna factor , antenna measurement , acoustics , circular polarization , antenna (radio) , engineering , electrical engineering , microstrip antenna , telecommunications , microstrip
Abstract A novel dual‐wire antenna to obtain wideband circular polarisation is proposed. The antenna consists of curl elements with a balanced feed above a ground plane. Using the moment method, an antenna with balanced feedlines having two sources is analysed first. Analysis reveals that the antenna shows a 3 dB axial‐ratio bandwidth of 36%. Next, an antenna with quasi‐balanced feedlines having one source to simplify the feed system is investigated. It is found both numerically and experimentally that the axial‐ratio bandwidth remains unchanged, and a VSWR of less than two is obtained.