Journal
IEEE SENSORS JOURNAL
Volume 15, Issue 9, Pages 5036-5044Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2015.2432807
Keywords
Conversion gain; diode doubler; electrically small antennas; vibration measurements; passive microwave remote sensing; wireless sensor networks (WSNs); 3-D antennas
Funding
- National Science Foundation [ECCS-0925929, ECCS-1232183]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1232183] Funding Source: National Science Foundation
Ask authors/readers for more resources
This paper presents a compact, energy-efficient, passive, and wireless vibration sensor node for embedded monitoring. The narrowband radio frequency (RF) communication system employs a frequency doubler on the sensor node to return the second harmonic of the interrogation signal. The compactness and high efficiency of the node are achieved by employing 3-D, machined-substrate small antennas on the transceiver. The node operates by receiving a signal at 2.4 GHz and reradiating a modulated signal at 4.8 GHz, and is optimized for an RF input power between -30 and -20 dBm. The node fits within a 21-mm diameter sphere (lambda/6 at 2.4 GHz) and its measured efficiency is 10% at -20-dBm input power. A commercial piezoelectric vibration sensor and mechanical switches are used to modulate the return signal. Experimental tests show that vibrations of <0.1-Hz frequency and 0.01-g amplitude can be detected. The communication range is greater than 60 m using a 43-dBm effective isotropic radiated power transmitter.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available