A Wideband Dual-Polarized Omnidirectional Antenna for Base Station/WLAN

• Published in: IEEE transactions on antennas and propagation 2018-01, Vol.66 (1), p.81-87
• Main Authors: Wang, Jun, Zhao, Lei, Hao, Zhang-Cheng, Jin, Jian-Ming
• Format: Article
• Language: English
• Subjects: Antenna radiation patterns; Antennas; Broadband; Broadband antennas; Dipole antennas; Dual polarization (waves); Dual-polarized omnidirectional antenna; Ground plane; Horizontal polarization; inverted-cone monopole; Local area networks; Mobile communication systems; modified cross bow-tie dipole; Omnidirectional antennas; Pins; Radio equipment; Vertical polarization; Wideband; Wireless communications; Wireless LAN; Wireless networks
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2017.2772322

A wideband dual-polarized omnidirectional antenna is proposed for mobile communication base station and 2.4 GHz wireless local area network applications. An integrated design is achieved by combining an inverted-cone monopole for vertical polarization (VP) and a modified cross bow-tie dipole for horizontal polarization (HP). The proposed antenna has a compact size because the HP element acts as the HP radiating element and the ground plane for the VP element simultaneously. The proposed VP and HP antennas are excited by a 50~\Omega Sub-Miniature-A connector and a broadband feeding network, respectively. The overall volume of the proposed antenna is only 0.35\lambda _{0}\times 0.35\lambda _{0}\times 0.25\lambda _{0} (with \lambda _{0} being the wavelength of the lowest frequency). Simulation results show that the dual-polarized omnidirectional antenna achieves a bandwidth (for \vert \text{S}_{11}\vert < -10 dB) of about 41.5% (1.64-2.5 GHz) with an isolation of at least 25 dB and the gain variations at the center frequency in the horizontal plane are 0.7 dB for VP and 2.3 dB for HP. The good agreements between the simulation and measured results validate the proposed design.