Transverse circular-polarized Bessel beam generation by inward cylindrical aperture distribution

Area of Science:

• Electromagnetics and Optics
• Antenna Theory and Design

Background:

• Investigating non-diffractive beams for applications requiring stable propagation.
• Understanding the relationship between aperture field distribution and beam characteristics.

Purpose of the Study:

• To analyze the focusing capability of a specific radiating aperture.
• To demonstrate the generation of a non-diffractive Bessel beam using a tangential electric field distribution.
• To design and optimize a practical launcher for circular-polarized Bessel beams.

Main Methods:

• Theoretical analysis of inward cylindrical traveling wave tangential electric field distribution.
• Design and optimization of a radial parallel plate waveguide launcher with spiral slot pairs.
• Experimental validation of the theoretical model and launcher performance.

Main Results:

• The aperture distribution generates a non-diffractive Bessel beam.
• The transverse electric field component follows a zero-th order Bessel function.
• The designed launcher exhibits performance consistent with theoretical predictions.
• Excellent polarization purity was achieved for the generated Bessel beam.

Conclusions:

• The proposed aperture field distribution is effective for generating non-diffractive Bessel beams.
• The developed Bessel beam launcher is a practical and efficient implementation.
• The study confirms the theoretical model and highlights the launcher's high polarization purity.