Abstract
A low-profile antenna capable of generating two coaxially propagating orbital angular momentum (OAM) modes is presented. It consists of two series-fed traveling-wave uniform circular arrays (UCA) of sequentially-rotated radiating slots and operates at 10190 MHz. The smaller and larger radius arrays, with 4 and 8 radiating elements, produce OAM modes with indices <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l<sup>OAM</sup></i> = 0 and +1, respectively. They are designed using a unique simulation-based step-by-step technique and implemented on a single layer of the substrate-integrated waveguide, resulting in a simple structure. The antenna's performance is evaluated using simulations and measurements, with a high agreement between the results. Both modes work in left-hand circular polarization (LHCP), with the first mode having a gain and axial ratio measured bandwidth of about 5.9 and 3.9 percent, respectively. In addition, the measured impedance bandwidth for the first and second modes is around 8.2 and 7.9 percent, correspondingly. Also, the orthogonality bandwidth of two identical antennas set 28 cm apart in front of each other is roughly 4.5 percent. The antenna's far-field and near-field radiation patterns are also investigated.
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.
