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Generation of OAM beams with quasi omnidirectional pattern using simple slotted waveguide array.

Yuvraj B Dhanade1, Amalendu Patnaik2

  • 1Department of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India.

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|March 19, 2024
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Summary

This study introduces a novel Slotted Waveguide Antenna (SWA) array for generating Orbital Angular Momentum (OAM) modes. The SWA offers high-power, simultaneous OAM beam generation in opposite directions, enhancing coverage for applications like radar.

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Area of Science:

  • Electromagnetics and Antenna Theory
  • Microwave Engineering
  • Wave Propagation

Background:

  • Orbital Angular Momentum (OAM) offers unique properties for wireless communication and sensing.
  • Generating multiple OAM modes simultaneously with high purity remains a challenge.
  • Existing methods often involve complex feeding structures or limited performance.

Purpose of the Study:

  • To propose and validate a novel Slotted Waveguide Antenna (SWA) array design for simultaneous OAM mode generation.
  • To achieve high-performance OAM beam generation with improved mode purity and power handling.
  • To explore the potential of the proposed SWA for applications requiring directional high-power beams.

Main Methods:

  • Theoretical analysis and design of a Slotted Waveguide Antenna (SWA) array.
  • Electromagnetic (EM) simulations to verify the antenna's theoretical performance.
  • Experimental verification using a laboratory prototype to validate simulation results.
  • Near-field and far-field measurements to characterize OAM beam generation and radiation patterns.

Main Results:

  • Successful simultaneous generation of first-order OAM beams along the propagation axis in opposite directions.
  • Demonstrated high mode purity in the generated OAM beams, confirmed by near-field measurements.
  • Achieved high gain and a quasi-omnidirectional radiation pattern in the far-field.
  • The all-metallic structure facilitates high-power OAM beam transmission.

Conclusions:

  • The proposed SWA array is an effective and novel approach for simultaneous OAM generation.
  • The antenna exhibits excellent performance characteristics, including high mode purity and gain.
  • The SWA shows promise for strategic applications involving high-power microwaves, such as radar target detection and potentially long-range OAM communication.