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Area of Science:

  • Electromagnetics
  • Wireless Communication
  • Optics

Background:

  • The radiative near-field regime is crucial for sub-Terahertz (sub-THz) wireless networks, offering focused and self-healing beams.
  • Existing methods to extend the near-field regime, like larger transmit arrays, face practical limitations in size, cost, and fabrication.
  • The favorable near-field properties are currently limited to a narrow range within the Fresnel regime.

Purpose of the Study:

  • To present a novel method for extending the effective near-field regime in sub-THz wireless communication.
  • To demonstrate distributed near-field beam shaping using multiple coordinated transmitting apertures.
  • To overcome the range limitations of near-field beam properties without impractical large-form-factor arrays.

Main Methods:

  • Mathematical modeling based on near-field electromagnetics, Fourier optics, and wave optics.
  • Experimental demonstration of distributed near-field beam shaping.
  • Utilizing multiple coordinated transmitting apertures to manipulate the electromagnetic field.

Main Results:

  • Successfully extended the functional range of advantageous near-field beam properties.
  • Demonstrated the feasibility of distributed beam shaping for increasing the effective near-field regime.
  • Validated the mathematical models through experimental results.

Conclusions:

  • Distributed near-field beam shaping offers a practical solution to extend the utility of near-field properties in sub-THz wireless systems.
  • This approach enhances beam focusing and resilience against blockages over a larger operational range.
  • Coordinated multiple apertures provide an alternative to large, complex transmit arrays for near-field applications.