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Area of Science:

  • Electromagnetics and Radio Communications
  • Antenna Array Design

Background:

  • Orbital Angular Momentum (OAM) radio beams offer potential for increased channel capacity via simultaneous multi-signal transmission.
  • Existing multi-mode OAM beam generation methods are often complex and costly, primarily existing at the simulation level.

Purpose of the Study:

  • To propose and validate an effective, low-cost design for generating five-mode OAM radio beams.
  • To demonstrate a practical implementation of multi-mode OAM beam generation using a Rotman lens-fed antenna array.

Main Methods:

  • Design of a Rotman lens-fed antenna array with a two-layer structure for size reduction.
  • Segregation of the lens body and antenna array using a common ground plane to mitigate spurious radiation.
  • Experimental measurement and comparison with simulated results for validation.

Main Results:

  • Successful generation of five-mode OAM radio beams.
  • Measured results closely matched simulated outcomes, confirming the design's effectiveness.
  • The Rotman lens approach proved to be a cost-effective and easily implementable alternative to electronically scanned arrays.

Conclusions:

  • The proposed Rotman lens-fed antenna array effectively generates multi-mode OAM radio beams.
  • The design offers a practical and economical solution for enhancing radio communication channel capacity.
  • The validated design paves the way for real-world applications of OAM in radio communications.