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Multifunctional Partially Reflective Surface for Smart Blocks.

Jae Hee Kim1, Dong-Jin Lee2, Tae-Ki An3

  • 1School of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education, Cheonan-si 31253, Chungcheongnam-do, Korea.

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This study introduces a novel multifunctional partially reflective surface (PRS) for smart block applications. The design integrates high-gain antennas with LED displays, enabling efficient passenger identification and fare collection.

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Fabry-Perot cavity antennagainpartially reflective surface (PRS)polarizationsmart block

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Area of Science:

  • Electromagnetics and Antenna Theory
  • Metamaterials and Metasurfaces
  • Wireless Communication Systems

Background:

  • Partially reflective surfaces (PRS) typically enhance antenna gain but are sensitive to structural changes.
  • Metallic objects on a PRS can degrade antenna performance by altering its periodic structure.
  • Smart block applications require high-gain antennas for accurate passenger identification and integrated displays.

Purpose of the Study:

  • To propose a multifunctional PRS for smart block systems that overcomes performance degradation issues.
  • To design a PRS capable of integrating LED displays without compromising antenna gain.
  • To leverage antenna polarization characteristics for maintaining performance with integrated LED lines.

Main Methods:

  • Development of a novel multifunctional partially reflective surface (PRS) structure.
  • Integration of LED components within the PRS while maintaining antenna gain.
  • Utilizing antenna polarization properties to mitigate performance loss from LED integration.
  • Experimental validation of the proposed antenna design and its performance characteristics.

Main Results:

  • The proposed multifunctional PRS successfully integrated LED displays.
  • Antenna gain was maintained despite the inclusion of LED lines.
  • Measured antenna efficiency was 81.4% at 2.41 GHz.
  • Achieved antenna gain of 18.3 dBi with a half-power beamwidth of 18°, indicating a directional pattern.

Conclusions:

  • The multifunctional PRS is suitable for smart block applications requiring high-gain antennas and integrated displays.
  • The proposed design effectively prevents performance degradation caused by LED integration.
  • The antenna exhibits excellent directional radiation characteristics, crucial for precise passenger identification.