Wireless MEMS sensor and method of reading the same
First Claim
1. A wireless sensor, comprising a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at first and second frequencies,wherein at least one of the first and second frequencies is swept in order to measure a MEMS parameter of the MEMS resonator, the MEMS parameter including one of:
- a mechanical quality factor, a mechanical resonance frequency or an electrical resonance frequency.
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Abstract
This document describes a wireless sensor comprising a MEMS resonator and an antenna directly matched thereto. Also a method of reading the wireless sensor is described. The method comprises illuminating the wireless sensor with electromagnetic energy at a first and second frequencies and receiving an intermodulation signal emitted by the wireless sensor in response to said electromagnetic energy at the first and second frequencies.
9 Citations
19 Claims
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1. A wireless sensor, comprising a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at first and second frequencies,
wherein at least one of the first and second frequencies is swept in order to measure a MEMS parameter of the MEMS resonator, the MEMS parameter including one of: - a mechanical quality factor, a mechanical resonance frequency or an electrical resonance frequency.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 12)
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8. A method of reading a wireless sensor including a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at two different frequencies, the method comprising:
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illuminating the wireless sensor with electromagnetic energy at a first and second frequencies; sweeping at least one of the first and second frequencies; receiving the intermodulation signal emitted by the wireless sensor in response to said electromagnetic energy at the first and second frequencies; and measuring the mechanical quality factor of the MEMS resonator by sweeping the first frequency and keeping the second frequency fixed. - View Dependent Claims (9, 10, 11)
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13. A reader for reading a wireless sensor comprising a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at two different frequencies, the reader comprising:
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signal generators configured to generate first and second signals respectively at first and second frequencies, at least one of the signal generators being further configured to sweep the respective first or second frequency, wherein the first or second frequency is swept in order to measure a MEMS parameter of the MEMS resonator, the MEMS parameter including one of a mechanical quality factor, a mechanical resonance frequency or an electrical resonance frequency; and antenna connected to the signal generators and configured to illuminate the wireless sensor with electromagnetic energy at the first and second frequencies and receive the electromagnetic signal emitted by the wireless sensor in response to said electromagnetic energy at the first and second frequencies.
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14. A method of reading a wireless sensor including a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at two different frequencies, the method comprising:
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illuminating the wireless sensor with electromagnetic energy at a first and second frequencies; sweeping at least one of the first and second frequencies; receiving the intermodulation signal emitted by the wireless sensor in response to said electromagnetic energy at the first and second frequencies; and measuring the mechanical resonance frequency of the MEMS resonator by sweeping the first frequency and keeping the second frequency fixed. - View Dependent Claims (15, 16)
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17. A method of reading a wireless sensor including a MEMS resonator and an antenna directly matched thereto, the wireless sensor adapted to emit electromagnetic signal at an intermodulation frequency when illuminated by electromagnetic energy at two different frequencies, the method comprising:
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illuminating the wireless sensor with electromagnetic energy at a first and second frequencies; sweeping at least one of the first and second frequencies; receiving the intermodulation signal emitted by the wireless sensor in response to said electromagnetic energy at the first and second frequencies; and measuring the electrical resonance frequency of the MEMS resonator by sweeping the first and second frequencies at a same rate. - View Dependent Claims (18, 19)
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Specification