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An umbrella‐shaped broadband circularly polarized antenna with wide beamwidth for global navigation satellite systems applications
Author(s) -
Yan YangDong,
Jiao YongChang,
Weng Zibin,
Zhang Chi
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31917
Subject(s) - beamwidth , center frequency , wideband , bandwidth (computing) , physics , optics , conductor , broadband , materials science , electrical engineering , telecommunications , antenna (radio) , engineering , band pass filter , composite material
A novel umbrella‐shaped wideband circular polarization (CP) antenna with a wide half‐power beamwidth (HPBW) and a wide axial ratio (AR) bandwidth is proposed in this article. Two pairs of symmetrical patch dipoles are attached to the surface of an umbrella‐shaped substrate to broaden both the impedance bandwidth (IBW) and the HPBW. A parasitic metallic ring is located immediately above the umbrella substrate to provide further enhancement of the HPBW. Each patch dipole is excited via a coaxial line, while a conductor balun with length of λ 0 /4 (where λ 0 is the wavelength of the center frequency) is introduced to obtain a feeding balance. Measurement results indicate that the proposed antenna has a −10 dB IBW of 71.3% (from 1.03 to 2.17 GHz), and a 3 dB AR bandwidth of 55.6% (from 1.13 to 2.0 GHz). Additionally, an HPBW of more than 110° is obtained over the whole CP bandwidth, 48.2% of which has an HPBW of more than 120°. The antenna has dimensions of 100 × 100 × 28 mm 3 , which corresponds to (0.52 × 0.52 × 0.14) λ 0 3 .