Wirelessly powered internet-of-things sensors facilitated by an electrically small egyptian axe dipole rectenna

Wei Lin, Richard W. Ziolkowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Wirelessly powered Internet-of-Things (IoT) sensors have many unique advantages compared with wire-powered or battery-based sensors. This paper presents two wirelessly powered sensors (light and temperature) facilitated by a highly compact and efficient electrically small rectenna. The IoT sensor is integrated into the rectifier circuit of the rectenna, which converts the captured AC power to DC energy. The output DC voltage of the rectifier is dependent on the variable impedance of the sensor corresponding to different discerned values. Once an acoustic alarm is attached to this sensor-augmented rectenna, a certain amount of the measured parameter (light or temperature level) can activate the alarm. The receiving antenna of the system is a modified version of a metamaterial-inspired electrically small Egyptian axe dipole (EAD) antenna. By meandering the length of the driven element, inductive impedance was achieved to directly match the receiving antenna to the capacitive impedance of the rectifier circuit. Prototypes of the wirelessly powered light and temperature sensors were fabricated and measured. Experimental results successfully demonstrated the light and temperature sensing performance. Both systems are highly compact and very thin (diameter is 0.13 λ0 and thickness is 0.002 λ0) with a ka value equal to 0.47. They are excellent representatives of WPT-driven sensors for the emerging wireless IoT applications.

Original languageEnglish (US)
Title of host publicationProceedings of the 2019 IEEE Asia-Pacific Microwave Conference, APMC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9781728135175
StatePublished - Dec 2019
Event2019 IEEE Asia-Pacific Microwave Conference, APMC 2019 - Singapore, Singapore
Duration: Dec 10 2019Dec 13 2019

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2019 IEEE Asia-Pacific Microwave Conference, APMC 2019

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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