2023/03/06 by Amar Al-Bassam, Al-Bassam, Amar, Dirk Heberling +3
Engineering · #Advanced Antenna and Metasurface Technologies #Antenna Design and Analysis #Applied Physics (physics.app-ph) #FOS: Physical sciences #Microwave Engineering and Waveguides
paper · pdf · doi:10.48550/arxiv.2304.03180
openalex publication_date 2023/03/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Over the past decade, the issue of gain degradation at broadside in periodic leaky-wave antennas (P-LWAs) has been resolved, using a circuit modeling approach, by introducing proper asymmetry in the unit cell of the antenna structure. This paper provides a more fundamental and insightful perspective of the problem by showing, using a simple coupled-mode analysis, that the optimal level of structural asymmetry corresponds to an exceptional point of the coupling parameter between the two eigenmodes of the P-LWA. This contribution represents a key step towards the development of a full electromagnetic resolution of the broadside issue.