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Broadband and wide beamwidth circularly polarized antenna based on CRLH‐TL for navigation terminal applications
Author(s) -
Luo XinShuai,
Weng Zibin,
Wang Lei,
Wang Feng,
Lin Chen
Publication year - 2018
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.31207
Subject(s) - beamwidth , optics , wilkinson power divider , axial ratio , physics , standing wave ratio , bandwidth (computing) , broadband , turnstile antenna , electrical engineering , power dividers and directional couplers , circular polarization , engineering , antenna (radio) , telecommunications , coaxial antenna , microstrip antenna , microstrip , frequency divider
A novel circularly polarized (CP) antenna with broadband and wide beamwidth for navigation terminal applications is presented in this article. A square patch with ring slots is adopted as radiator, which is fed by a Wilkinson power divider based on composite right‐/left‐handed transmission line (CRLH‐TL). The CP wave is produced by four linear polarized waves with equal amplitude but 90° phase shift. The proposed feeding network can provide stable phase shift in a wide bandwidth compared to the traditional power divider. Four Γ‐shaped parasitic branches are conducted to widen their 3 dB beamwidths which are raised to 100° at representative navigation frequencies. The size of the proposed antenna is 0.73λ 0 × 0.73λ 0 × 0.18λ 0 (λ 0 is the wavelength at center frequency in free space). The impedance bandwidth for VSWR < 2 is 83.61% and the 3 dB axial ratio (AR) bandwidth is 69.76%. Good agreement between simulated and measured results over the interested frequency bands is observed.