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A 24-GHz Front-End Integrated on a Multilayer Cellulose-Based Substrate for Doppler Radar Sensors.

Federico Alimenti1, Valentina Palazzi2, Chiara Mariotti3

  • 1Department of Engineering, University of Perugia, 06125 Perugia, Italy. federico.alimenti@unipg.it.

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|September 13, 2017
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Summary
This summary is machine-generated.

This study introduces a stamp-sized, low-cost Doppler radar motion sensor for Internet of Things (IoT) applications. Utilizing eco-friendly cellulose, it achieves 10m detection range for walking people and measures speeds down to 50 mm/s.

Keywords:
Doppler radar sensorsInternet of things (IoT)all-natural electroniccircuits on celluloseflexible substratesgreen electronicspaper-based substratessubstrate integrated circuits

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Area of Science:

  • Microwave Engineering
  • Materials Science
  • Internet of Things (IoT)

Background:

  • Miniaturized sensors are crucial for low-cost Internet of Things (IoT) applications.
  • Developing cost-effective and sustainable materials for high-frequency electronics is an ongoing challenge.
  • Cellulose-based substrates offer potential for eco-friendly and low-cost electronic devices.

Purpose of the Study:

  • To present a miniaturized Doppler radar motion sensor for IoT applications.
  • To demonstrate the integration of radar front-end and antenna on a novel cellulose-based substrate.
  • To evaluate the performance of the cellulose-based radar sensor for motion detection.

Main Methods:

  • Fabrication of a multilayer cellulose-based substrate using paper, glue, and metal layers.
  • Integration of a 24 GHz radar front-end and antenna on the substrate using a distributed microstrip structure.
  • Utilizing a copper adhesive laminate for low-loss conductor realization.
  • Testing the sensor's motion detection capabilities for walking people and minimum speed measurement.

Main Results:

  • Successful integration of radar components on a multilayer cellulose substrate.
  • The miniaturized radar sensor operates at 24 GHz with 5 mW transmission power.
  • The antenna exhibits a gain of 7.4 dBi and a 48-degree half-power beam-width.
  • Detection of walking person movement up to 10 m and minimum speed measurement of 50 mm/s up to 3 m.

Conclusions:

  • Cellulose-based substrates are viable for realizing high-frequency hardware, including radar sensors.
  • The developed sensor is a low-cost, eco-friendly motion detection solution for IoT.
  • This work paves the way for cellulose-based devices in the IoT sensing layer.