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Wideband dual‐polarized planar antenna for base stations
Author(s) -
Liu Ying,
Wang Jiu,
Gong Shuxi
Publication year - 2015
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.29241
Subject(s) - optics , wideband , physics , planar , microstrip antenna , microstrip , stub (electronics) , coaxial antenna , dipole antenna , electrical engineering , engineering , antenna (radio) , computer science , computer graphics (images)
A broadband dual‐polarized planar antenna with simple reflector is introduced. The antenna is composed of two pairs of circular slotted square arms which are coupling‐fed by two fan‐shaped microstrip lines. By properly adjusting the feeding structure, the antenna can be connected to 50‐Ω coaxial lines directly, making the antenna full planar. Due to the fan‐shaped microstrip stub and the tight coupling between the two dipoles, a bandwidth of 48.2% (1.62–2.68 GHz) for Return Loss > 14 dB and sufficient high port‐to‐port isolation of 30 dB can be achieved simultaneously. Circular holes are introduced to elongate the current path, leading to a compact and light‐weight radiator structure (0.36λ 0 × 0.36λ 0 , where λ 0 refers to the center operating frequency) which contributes to a simple reflector. Besides, the measured results show that a stable half‐power beam width of 70° ± 3°, an average gain of 7.6 ± 0.3 dBi for slant ±45° polarizations, and a low cross‐polarization of 29 dB are realized. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1948–1952, 2015