Open AccessEnhancement of axial ratio‐beamwidth of X‐band composite microstrip patch antenna with conical ground plane
Author(s) -
Narke S.,
Ananthakrishnan S.,
Bhattacharya C.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.3729
Subject(s) - beamwidth , axial ratio , ground plane , optics , patch antenna , microstrip antenna , materials science , radiation pattern , fan beam antenna , antenna (radio) , physics , microstrip , coaxial antenna , circular polarization , electrical engineering , engineering
A single‐feed circularly polarised (CP) composite microstrip patch antenna (MPA) with a 3D conical ground plane at X‐band is presented here to meet the requirements of wide beamwidth for on‐board antenna structures of highly rotating bodies in projectile motion. The results of the measurement for fabricated antenna in the anechoic chamber show that a half power beamwidth > 120 ° and axial ratio (AR) beamwidth > 100 ° are achieved for right‐hand CP radiation pattern in both the xoz and yoz planes with a gain of ∼ 2dBi . The AR at the resonating frequency of 10.28 GHz has a low figure of 0.46 dB producing nearly smooth CP foot print with a wide AR beamwidth. The measured reflection coefficient ( S 11 ) of CP–MPA is < − 15dB at 10.28 GHz with an impedance bandwidth that is 8.75% of the resonant frequency. The figure of merit for cross‐polarisation in the fabrication is ∼ 18dB , i.e. achieved at the zenith of co‐polarisation.