Improved Directivity of an OAM Antenna by a Fabry-Perot Cavity: An Experimental Study

Wenlong Wei , Kourosh Mahdjoubi (1) , Christian Brousseau (1) , Olivier Emile (2)

1 IETR - Institut d'Électronique et des Technologies du numéRique
2 UR - Université de Rennes

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.

Mots clés: Circular Antenna Array; Fabry-Perot Cavity; Orbital Angular Momentum; Patch Antenna; Phase Shifter

Domaines: Electromagnétisme; Electronique; Sciences de l'ingénieur [physics]

Wenlong Wei, Kourosh Mahdjoubi, Christian Brousseau, Olivier Emile. Improved Directivity of an OAM Antenna by a Fabry-Perot Cavity: An Experimental Study. Open Journal of Antennas and Propagation, 2021, 09 (04), pp.65 - 73. ⟨10.4236/ojapr.2021.94006⟩. ⟨hal-03507072⟩