Abstract
Intermodulation communication principle has been recently developed to wirelessly read-out passive sensors. Intermodulation communication sensors reply the sensor information at an intermodulation frequency when interrogated by a reader device with two tones. This paper derives an analytical expression for optimizing the electrical circuitry of such a sensor. The derived equations are verified by harmonic balance simulations. An optimized sensor is designed and fabricated and experimentally characterized. Results show that 1% change in the sensor capacitance can still be detected at a 13 m-distance and the read-out principle could enable an extreme resolution at shorter distances (less than per mille below 5 m). A wireless electrocardiography measurement is demonstrated.
Original language | English |
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Pages (from-to) | 3446-3452 |
Journal | IEEE Transactions on Microwave Theory and Techniques |
Volume | 61 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2013 |
MoE publication type | A1 Journal article-refereed |
Keywords
- intermodulation
- mixers
- RF identification (RFID)
- wireless sensors