Author(s)

Wenlong Wei¹, Wenlin Kuai¹, Kourosh Mahdjoubi², Christian Brousseau², Olivier Emile³

¹Shanghai Satellite Engineering Institute, Shanghai, China.
²Institute of Electronics and Telecommunications of Rennes (IETR), University of Rennes 1, Rennes, France.
³Laser Physics Laboratory (LPL), University of Rennes 1, Rennes, France.

The circular phased antenna array is commonly used for generating waves bearing Orbital Angular Momentum (OAM) in the radio frequency band, but it achieves a relatively low directivity. To overcome this drawback, we present here a method to improve the directivity of an OAM circular phased antenna array by embedding it inside a Fabry-Perot cavity. The Fabry-Perot cavity contains three main parts: a partially reflecting surface (PRS), an air cavity and a ground plane. Simulation data show that the directivity of this new OAM antenna achieves an improvement of 8.2 dB over the original array. A prototype is realized and characterized. The simulated and measured characteristics are in good agreement.

Circular Antenna Array, Fabry-Perot Cavity, Orbital Angular Momentum, Patch Antenna, Phase Shifter

Wei, W. , Kuai, W. , Mahdjoubi, K. , Brousseau, C. and Emile, O. (2021) Improved Directivity of an OAM Antenna by a Fabry-Perot Cavity: An Experimental Study. Open Journal of Antennas and Propagation, 9, 65-73. doi: 10.4236/ojapr.2021.94006.