MR01b-21 Sensor System using Wireless Energy Harvesting

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CHAN, Yin Pui(@ypchanai)
January 19, 2022 5:10 pm

I see you’ve already made a rectenna prototype for harvesting the ambient energy. May I ask how long does it take to collect sufficient energy for the PMU and the MCU? Also, is it very sensitive to the environment? If you place it in the indoor environment, could it still operate?

SHEN, Shanpu(@eeshanpu)
January 19, 2022 3:16 pm

A very interesting project. What kind of antenna was used in your energy harvesting system? Should add some details about the antenan design. In addition, have you measured the power denisty of the RF energy in the ambient environment?

FUNG, Piu Suen(@psfung)
January 19, 2022 3:41 pm
Reply to  SHEN, Shanpu

Thank you for your comments. The antenna we are using is a microstrip antenna like the picture on the poster. The power density is very different under different environments, for example, in HKUST the 900MHz would have the strongest power, but the other is not. That is the reason that we also focus on that frequency. The power from the rectenna would be around 10uW.

CAO, Xuanyu(@eexcao)
January 19, 2022 2:55 pm

Interesting project. What are the potential applications of this energy-harvesting system?

FUNG, Piu Suen(@psfung)
January 19, 2022 3:03 pm
Reply to  CAO, Xuanyu

Thank you for comments. This energy harvesting system can be use as the applications that do not required high update rate, for example, environment data collection (temperature, humidity, etc). Also, there is an application that can be installed on the tree to detect is it fall down or not. Those rare case event detecting would be useful.

ZHANG, Jun(@eejzhang)
January 19, 2022 2:51 pm

This is an interesting and quite comprehensive project. The progress part only mentioned the transmission component. How about the progress on rectifier design, PMU design, and sensor system design? or did you adopt existing design for these components? Please identify what will be your own contribution to the overall system.

WONG, Kam Hung(@khwongbu)
January 19, 2022 3:07 pm
Reply to  ZHANG, Jun

Thank you, professor Zhang. Because this project is trying to connect the EMSD LoRaWAN. We do the LoRa transmission part first. For now, the sensor system is half done. We will keep doing our best to finish another part.

ZHANG, Jun(@eejzhang)
January 19, 2022 3:11 pm
Reply to  WONG, Kam Hung

Sounds good. Look forward to the final system.

WONG, Kam Hung(@khwongbu)
January 19, 2022 3:13 pm
Reply to  ZHANG, Jun

Thank you.

ZHAO, Xiaoqi(@xzhaobb)
January 19, 2022 2:46 pm

Innovative and sophisticated

WONG, Kam Hung(@khwongbu)
January 19, 2022 2:47 pm
Reply to  ZHAO, Xiaoqi

Thank you