Broadside Dual-channel Orthogonal-Polarization Radiation using a Double-Asymmetric Periodic Leaky-Wave Antenna
Amar Al-Bassam, Simon Otto, Dirk Heberling, Christophe Caloz
TL;DR
This paper introduces a double asymmetric periodic leaky-wave antenna design that enables simultaneous broadside radiation of two orthogonal modes, enhancing polarization diversity for wireless communication applications.
Contribution
It presents a novel double asymmetric unit cell design combining circularly polarized and coupled mode elements, demonstrating dual-mode broadside radiation through simulations and experiments.
Findings
Double asymmetry enables orthogonal mode radiation
Degree of transversal asymmetry controls cross-polarization discrimination
Experimental validation confirms simulation results
Abstract
The paper demonstrates that double unit-cell asymmetry in periodic leaky-wave antennas (P-LWAs), i.e. asymmetry with respect to both the longitudinal and transversal axes of the structure -- or longitudinal asymmetry (LA) and transversal asymmetry (TA) -- allows for the simultaneous broadside radiation of two orthogonal modes excited at the two ports of the antenna. This means that the antenna may simultaneously support two orthogonal channels, which represents an interesting polarization diversity characteristics for wireless communications. The double asymmetric (DA) unit cell combines a circularly polarized LA unit cell and a coupled mode TA unit cell, where the former provides equal radiation in the series and shunt modes while the latter separates these two modes in terms of their excitation ports. It is also shown that the degree of TA in the DA unit cell controls the…
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