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Broadband circularly polarized magneto-electric dipole antenna for millimeter-wave communication
Ting Wu1,2, Chen Zhang1
1Xi'an Key Laboratory of Wireless Optical Communication and Network Research, School of Automation and Information Engineering, Xi'an University of Technology, Xi'an, Shaanxi Province, China.
Abstract:
This article proposes a broadband circularly polarized (CP) magnetoelectric (ME) dipole antenna for millimeter-wave (mmW) communications. Based on a conventional linearly polarized ME-dipole, a pair of centrally symmetric L-shaped strips generates a rotating electric field with a 90° phase difference for CP radiation. A microstrip line feeds the antenna via a center-symmetrical matching branch on a coupling slot. A parasitic top layer enhances bandwidth, achieving 26.9% impedance bandwidth (|S11| < -10 dB), 20.8% 3-dB axial ratio (AR) bandwidth, and 8 dBic peak gain for the element. A fabricated 4 × 4 array using these elements with sequential rotation technique (SRT) feeding shows good agreement between simulation and measurement: 30.7% impedance bandwidth, 26.5% 3-dB AR bandwidth, and 15 dBic peak gain. The design offers superior CP performance, low profile, and high integration for millimeter-wave systems.
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