DocumentCode
1454479
Title
Intermodulation Read-Out Principle for Passive Wireless Sensors
Author
Viikari, Ville ; Seppä, Heikki ; Kim, Dong-Wook
Author_Institution
VTT Tech. Res. Centre, Espoo, Finland
Volume
59
Issue
4
fYear
2011
fDate
4/1/2011 12:00:00 AM
Firstpage
1025
Lastpage
1031
Abstract
This paper presents a general intermodulation read-out principle for passive wireless sensors. A sensor utilizes a mixing element, such as a varactor, and it can be equipped with a capacitive, inductive, or resistive sensor element. When the sensor is illuminated with signals with two frequencies, it replies the sensor data at an intermodulation frequency. An analytical expression for the intermodulation response of the sensor is derived and verified by simulations. The concept is demonstrated at 1.2 GHz.
Keywords
capacitive sensors; detector circuits; inductive sensors; intermodulation; mixers (circuits); varactors; capacitive sensor element; frequency 1.2 GHz; inductive sensor element; intermodulation read-out principle; intermodulation response; mixing element; passive wireless sensor; resistive sensor element; varactor; Capacitance; Capacitive sensors; Frequency measurement; RLC circuits; Resonant frequency; Varactors; Mixers; RF identification (RFID); wireless sensors;
fLanguage
English
Journal_Title
Microwave Theory and Techniques, IEEE Transactions on
Publisher
ieee
ISSN
0018-9480
Type
jour
DOI
10.1109/TMTT.2011.2108309
Filename
5716703
Link To Document