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Broadband unidirectional printed antenna with quad‐folded dipoles for circular polarization
Author(s) -
Ding Xiaoxiang,
Zhao Zhiqin,
Yang Yaohui,
Zhou Lin,
Ouyang Jun,
Liu QingHuo
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.29465
Subject(s) - optics , axial ratio , microwave , broadband , dipole antenna , radiation , physics , dipole , circular polarization , turnstile antenna , radiation pattern , electrical engineering , materials science , optoelectronics , engineering , coaxial antenna , antenna (radio) , telecommunications , microstrip , quantum mechanics
In this article, a broadband unidirectional printed antenna with quad‐folded dipoles for circularly polarized radiation is proposed. The antenna consists of a trapezoidal feed structure, an annular transmission line and quad‐folded dipoles. An 80 × 80 mm 2 reflector is used to achieve unidirectional radiation. Measured results indicate that the proposed design achieves an impedance bandwidth of 37.1% (1.82–2.65 GHz) for the voltage standing wave ratio <2.0 and a 3 dB axial ratio bandwidth of 35% (1.84–2.62 GHz), covering the third‐generation (3G, 1880–2125 MHz)/long‐term evaluation (1880–2400 MHz)/wireless local area network (2400–2480 MHz) bands. An average gain of 6.3 dBic is obtained in the operating band. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2871–2876, 2015