A low profile circularly polarized antenna with L-shape energy coupling slot and the S-shaped matched transmission line

作者：Mo, Wendong; Zhang, Wenmei^*

来源：Electromagnetics, 2018, 38(5): 317-327.

DOI：10.1080/02726343.2018.1473193

• Circularly polarized antenna
• low profile
• omni-directional radiation
• wide axial-ratio beamwidth

In this paper, a novel low profile circularly polarized antenna with L-shape energy coupling slot and the S-shaped matched transmission line (SMTL) is presented. It consists of a monopolar radiator and a hexagonal radiator which will generate vertically and horizontally polarized electric field E and E-phi, respectively. To satisfy the required magnitude/phase relationship between two radiators, the double L-shape energy coupling slot and the SMTL are introduced. Also, 12 circular shape patches are arranged sequentially on the hexagonal radiator to obtain a wide AR beamwidth. The measured results show that the realized antenna has an impedance bandwidth of 2.1% (5.76-5.88GHz). In particular, the 3dB Axial Ratio (AR) beamwidth at 5.8GHz is extended to 212 degrees (phi=0 degrees plane) and 217 degrees (phi=90 degrees plane). Stable RHCP omni-directional radiation patterns are obtained over the operating bandwidth with a peak gain of 1.25dBi. A good agreement between the simulated and measured results is obtained.

• 出版日期2018
• 单位山西大学