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Isolation Improvement in Reflectarray Antenna-Based FMCW Radar Systems.

Hesham Yamani1, Jihwan Yoon1

  • 1Electrical and Biomedical Engineering Department, University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557, USA.

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|November 26, 2022
PubMed
Summary

This study optimizes reflectarray RF sensors for detecting UAVs and humans. A novel back-to-back antenna configuration significantly improves isolation, preventing receiver damage in radar systems.

Keywords:
RF motion sensornumerical modelingpassive gain enhancementpatch antenna arrayreflectarray antennas

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Area of Science:

  • Electromagnetics and RF Engineering
  • Radar Systems and Sensing Technology

Background:

  • Previous reflectarray-based radar systems enhanced human detection range and antenna gains.
  • Direct signal propagation from transmit (TX) to receive (RX) antennas caused desensitization issues.

Purpose of the Study:

  • To optimize reflectarray antenna configurations for improved RF sensor performance.
  • To mitigate direct signal coupling in reflectarray-based radar systems for UAV and human detection.

Main Methods:

  • Proposed a novel back-to-back antenna placement for TX and RX antennas.
  • Removed the direct signal path between TX and RX antennas through the reflectarray.
  • Evaluated antenna gains and isolation levels of the new configuration.

Main Results:

  • Achieved an optimal isolation level of 51.3 dB.
  • TX antenna gain increased to 30.6 dBi with the reflectarray.
  • RX antenna gain was 16 dBi, resulting in a 14.6 dB TX/RX gain difference.

Conclusions:

  • The back-to-back antenna configuration effectively reduces direct signal coupling in reflectarray RF sensors.
  • This optimization enhances the robustness of radar systems for detecting UAV and human presence.
  • Further improvements in isolation can be achieved with high-gain receiver amplifiers.