Microwave photonic (MWP) radars based on radio-frequency orbital angular momentum(RF-OAM) beams have been extensively researched recently, for their potential to provide high-azimuth and high-range resolution for radar imaging at the same time. However, the inherent divergence effect of RF-OAM beams limits the effective detection distance, which has become the main technical bottleneck of the long-distance MWP OAM radar. In this paper, the mathematical model of the MWP-controlled circular antenna array (CAA) is constructed, and the basic transmission properties of generated RF-OAM beams are investigated. Then each factor in the model is extracted for numerical simulation to explore its influence on the generation of RF-OAM beams, and the Bessel function term is found to be the factor leading to beam-divergence. Within the Bessel function term, the role that each physical element plays is analyzed, which is just consistent with our experimental experience and previous research results. Finally, the quantization equation of the RF-OAM beam divergence angle is fitted based on the properties of the Bessel function.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.