Abstract
In this paper, a chamfer distribution antenna array is designed to generate a deflecting circular-polarized vortex beam carrying orbital angular momentum (OAM) mode. When the vortex beam is designed with a deflection angle, the sidelobe of the vortex beam will deteriorate. In order to solve this problem, an optimized array design is presented in this paper. Inspired by the Chebyshev distribution array synthesis method, the antenna elements in the four corners of the antenna array are cut out to realize the chamfer distribution array. Therefore, the sidelobe level of the deflected vortex beam can be effectively suppressed. Moreover, a simplified feeding network is designed to reduce the feeding network complexity by using circularly polarized structural center antenna element. The designed antenna array is simulated, fabricated, and measured at center frequency of 4.25 GHz in C-band. The far-field radiation pattern of the deflected vortex beam and the near E-field OAM vortex beam distribution are simulated and measured to verify the effectiveness of the proposed design method for sidelobe suppression array.
Highlights
Orbital angular momentum (OAM) brings more opportunities in communication and radar detection fields [1]–[5]
orbital angular momentum (OAM) vortex wave was first introduced to radio domain through the uniform circular array (UCA) antenna [6] and studied in detail later [7]
Some optimization array design methods were presented for UCA antenna, they were mainly used for the vortex beam without the beam deflection [13]
Summary
Orbital angular momentum (OAM) brings more opportunities in communication and radar detection fields [1]–[5]. It is well known that for conventional pencil beams, when a beam scans away from the normal direction, its beam sidelobe will become deteriorated [17] This problem is more serious for the deflected OAM vortex beam [7], [11], because of the hollow cone beam in the middle. Some optimization array design methods were presented for UCA antenna, they were mainly used for the vortex beam without the beam deflection [13]. J. Liang et al.: Synthesis and Measurement of a Circular- Polarized Deflection OAM Vortex Beam. In [18], the deflected vortex beam with sidelobe level approximately higher than −5 dB was reported. The corresponding simulation results of far field radiation pattern and near field vortex beam field distribution are given.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
