Microwave vortex beam launcher design

@article{Salem2018MicrowaveVB,
  title={Microwave vortex beam launcher design},
  author={N. Pelin M. H. Salem and Edip Niver and Mohamed A. Salem},
  journal={IET Microwaves, Antennas \& Propagation},
  year={2018}
}
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… 
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