Microwave Vortex Beam Launcher Design
N. Pelin M. H. Salem, Edip Niver, Mohamed A. Salem
TL;DR
This paper presents a new microwave vortex beam launcher design that uses a coaxial loop antenna to excite a TE mode in a circular waveguide, with analytical and simulation validation.
Contribution
It introduces a novel vortex beam launcher design for microwaves, including analytical modeling and optimal antenna placement for efficient excitation.
Findings
Analytical model matches simulation results.
Optimal antenna placement improves input impedance matching.
Validated design enables efficient microwave vortex beam generation.
Abstract
A novel design for a vectorial vortex beam launcher in the microwave regime is devised. The beam is formed by launching a single guided transverse electric (TE) mode of a metallic circular waveguide into free-space. Excitation is achieved by the mean of an inserted coaxial loop antenna. Modal expansion coefficients are computed, and the resulting electric and magnetic fields are determined. The effect of the antenna location inside the waveguide on its effective input impedance is modelled using transmission-line relations and location for optimal matching is established. The analytical results are confirmed using multi-level fast multipole method full-wave simulations.
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