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Over the past decades, orbital angular momentum (OAM) has attracted great interest due to its helical phase characteristics. It has been proved that plane spiral OAM (PSOAM) waves have a potential in azimuthal pattern reconfiguration. PSOAM waves could be termed as a special form of OAM wave, which avoids the inconsistency of the divergent angles for different OAM waves. However, from a practical point of view, such a PSOAM-based pattern reconfiguration scheme badly needs a compact high-purity multimode PSOAM antenna. In this communication, a compact high-purity eight-mode PSOAM antenna consisting of a coaxial resonator group (CRG) and a rotating parabolic reflector (RPR) is fabricated and measured. The prototype is designed for X-band operation with a bandwidth of 140 MHz, and the simulated efficiencies of the PSOAM modes &#x00B1;1, &#x00B1;2, &#x00B1;3, and &#x00B1;4 are 88.86%, 92.18%, 90.93%, and 91.25%, respectively. The constructed pattern may have the directivity, vorticity, and nondistortion azimuthal 360&#x00B0; scanning capability. This scheme realizes these pattern characteristics with a simpler algorithm and a lower system complexity compared with the phased array antenna-based pattern reconfiguration scheme. It will have potential in next-generation radar and wireless communication system.

A Compact Pattern Reconfiguration Antenna Based on Multimode Plane Spiral OA