Designing a passive retrodirective wireless sensor

Md Mazidul Islam, Kimmo Rasilainen, Sabin Kumar Karki, Ville Viikari

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)


This letter presents a wireless sensing approach implemented using a fully passive sensor element and a retrodirective antenna array. The utilized sensor is based on frequency modulation, and the proposed concept is investigated both theoretically and experimentally. Results of the study show that the designed sensor platform can be used to detect a change in sensor capacitance across a distance of up to 12 m. Furthermore, the retrodirective sensor can cover an angular range of almost-90 to +90, which is considerably broader than what can be obtained with a simpler passive RFID sensor.

Original languageEnglish
Article number7858689
Pages (from-to)1739-1742
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


  • Antenna array
  • Diode
  • Modulator
  • oscillator
  • Passive
  • retrodirective
  • Sensor
  • Wireless

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