A broadband horizontally polarised omnidirectional antenna with stable radiation patterns

• Main Authors: Zhou Lei, Cui Mantang, Lu Yangyi
• Format: Article
• Language: English
• Published: Wiley 2019-08-01
• Series: The Journal of Engineering
• Subjects: ultra wideband antennas; antenna feeds; microstrip antennas; antenna radiation patterns; Long Term Evolution; omnidirectional antennas; power dividers; planar antennas; stable radiation patterns; orthogonal broadband HPOA units; wideband power divider; modified Vivaldi antennas; designed antenna; antenna gains; omnidirectional radiation feature; broadband horizontally polarised omnidirectional antenna; noise figure -10.0 dB; noise figure 4.8 dB; frequency 2.5 GHz to 6.5 GHz
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0251
• ISSN: 2051-3305

A broadband horizontally polarised omnidirectional antenna (HPOA) with stable radiation patterns is proposed. The antenna is composed of two orthogonal broadband HPOA units fed by a wideband power divider. Each HPOA consists of four modified Vivaldi antennas fed by a 1-to-4-way wideband power divider. The four Vivaldi antennas are etched on a circular substrate. The proposed antenna is simulated and discussed. Simulation results demonstrate that the designed antenna obtains a bandwidth of 88.9% from 2.5 to 6.5 GHz with reflection coefficients less than −10 dB, and the antenna gains are higher than 2 dBi in the whole frequency band. The antenna shows omnidirectional radiation feature with ripples less than 4.8 dB in the horizontal plane. The proposed antenna is suitable for 4G-LTE and 5G communication systems.