Study of Horizontally Polarized Omnidirectional Microstrip Antenna Arrays

• Main Authors: K. Wei, J. Y. Li, L. Wang, R. Xu
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2017-04-01
• Series: Radioengineering
• Subjects: Antenna array; horizontal polarization; omnidirectional radiation pattern; microstrip antenna
• Online Access: http://www.radioeng.cz/fulltexts/2017/17_01_0107_0113.pdf

This paper presents two microstrip antenna arrays for horizontally polarized (HP) omnidirectional application, namely rectangular patch antenna array and H-shaped patch antenna array. There are eight patch elements placed with back-to-back structure, four patch elements on each side. Antenna arrays are fed by a split eight power divider. The H-shaped patch antenna array has better omnidirectional performance than rectangular patch antenna array. The H-shaped antenna array is fabricated and measured. Both simulated and measured results show that the bandwidth of the designed H-shaped antenna array is 36 MHz with a center frequency 2.35 GHz. Horizontally polarized gains are greater than 7 dBi over the resonant band (S11 less than 10 dB), while the cross-polarization level is less than −25 dB. The proposed H-shaped antenna array has high directivity (half-power beam-width is only 20 deg) and good omnidirectional performance (gain variation less than 1.5 dBi) at the center frequency.