Integrated Multimode Orbital Angular Momentum Antenna Based on RF Switch

This paper proposes an electronically reconfigurable multimode orbital angular momentum (OAM) patch array antenna using single pole double throw radio frequency switch that can complete dynamic switching of three modes (-1,0,1) at 2.4 GHz. As a new type of multiplexing technology, the application value of OAM technology in radar imaging and wireless communication has been continuously verified. Considering that many theoretical algorithms are proposed, a multimode vortex antenna that meets the experimental requirements should be developed. The proposed antenna consists of RF switch, programmable microcontroller, phase-shifted feed network, and $2\times2$ rectangular array. Different feeder networks were selected by controlling the RF switch to generate vortex beams with different modes. The proposed antenna was numerically simulated and physically produced. The feasibility of the design was verified through experiments. The simulation and design results are basically the same. The proposed scheme has simple structure, easy to design and deploy, and has important significance in the design of many mode vortex antenna applications in communication and radar imaging.