TITLE:
Improved Directivity of an OAM Antenna by a Fabry-Perot Cavity: An Experimental Study
AUTHORS:
Wenlong Wei, Wenlin Kuai, Kourosh Mahdjoubi, Christian Brousseau, Olivier Emile
KEYWORDS:
Circular Antenna Array, Fabry-Perot Cavity, Orbital Angular Momentum, Patch Antenna, Phase Shifter
JOURNAL NAME:
Open Journal of Antennas and Propagation,
Vol.9 No.4,
December
28,
2021
ABSTRACT: 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.