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Patent US6025725A successfully refreshed from Google Patents.
US6025725A
Expired / Lapsed
US
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Electrically active resonant structures for wireless monitoring and control
Assignee: Massachusetts Institute of Technology
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Filing: 1997-12-04
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Granted: 2000-02-15
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Expires: 2017-12-04
Abstract
Abstract A planar electromagnetic resonator utilizes an electromagnetically active material located between the capacitive or inductive elements of the resonator. A microscopic electrical property of this material is altered by an external condition, and that alteration, in turn, affects the behavior of the resonator in a consistent and predictable manner.
Inventors
- 👤 Neil Gershenfeld
- 👤 Richard Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/0006
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
71 words
A device for remote sensing comprising an inductor and a capacitor connected to form an electrical circuit having a resonant frequency, the capacitor comprising a pair of conductors separated by a dielectric, the device comprising a material having an intrinsic electrical property altered by an external condition, alteration of the electrical property remotely detectably varying at least one characteristic of the circuit selected from resonant frequency, harmonic spectra and Q factor.
Claim 2
Independent Claim
71 words
A device for remote sensing comprising an inductor and a capacitor connected to form an electrical circuit having a resonant frequency, the capacitor comprising a pair of conductors separated by a dielectric, the device comprising a material having an intrinsic electrical property altered by an external condition, alteration of the electrical property remotely detectably varying at least one characteristic of the circuit selected from resonant frequency, harmonic spectra and Q factor.
Claim 3
Dependent Claim
24 words
The device of claim 1 wherein the external condition is at least one of (a) applied force, (b) temperature, (c) humidity, and (d) light.
Claim 4
Dependent Claim
17 words
The device of claim 1 wherein the material having an intrinsic electrical property is also the dielectric.
Claim 5
Dependent Claim
13 words
The device of claim 3 wherein the intrinsic electrical property is charge leakage.
Claim 6
Dependent Claim
14 words
The device of claim 3 wherein the material is polyvinylidene difluoride in sheet form.
Claim 7
Dependent Claim
12 words
The device of claim 3 wherein the material is a piezoelectric ceramic.
Claim 8
Dependent Claim
12 words
The device of claim 3 wherein the material is a photoconductive polymer.
Claim 9
Dependent Claim
10 words
The device of claim 3 wherein the material is magnetostrictive.
Claim 10
Dependent Claim
10 words
The device of claim 3 wherein the material is ferroelectric.
Claim 11
Dependent Claim
17 words
The device of claim 1 wherein the material having an intrinsic electrical property is also the inductor.
Claim 12
Dependent Claim
13 words
The device of claim 10 wherein the intrinsic electrical property is magnetic permeability.
Claim 13
Dependent Claim
57 words
The device of claim 1 wherein the inductor comprises at least two pancake spirals of conductive material each disposed on an insulative sheet, the spirals having outermost loops electrically connected to one another, the spirals being disposed opposite one another to also serve as plates forming the capacitor, and the dielectric material being located between the spirals.
Claim 14
Dependent Claim
33 words
The device of claim 12 wherein the spirals are located on the same insulative sheet in spaced-apart relation to one another, the spirals being disposed opposite one another by folding of the sheet.
Claim 15
Dependent Claim
30 words
The device of claim 12 wherein the spirals each comprise an inner terminus, the inner terminus of at least one of the spirals comprising a solid area of conductive material.
Claim 16
Dependent Claim
14 words
The device of claim 3 wherein the dielectric material is sealed between the conductors.
Claim 17
Dependent Claim
19 words
The device of claim 3 wherein at least a portion of the dielectric material is at least partially exposed.
Claim 18
Independent Claim
107 words
A method of sensing an external condition, the method comprising: a. providing a device for remote sensing comprising an inductor and a capacitor connected to form an electrical circuit having a resonant frequency, the capacitor comprising a pair of conductors separated by a dielectric, the device comprising a material having an intrinsic electrical property altered by an external condition, alteration of the electrical property remotely detectably varying at least one characteristic of the circuit selected from resonant frequency, harmonic spectra and Q factor; b. exposing the device to the external condition; c. wirelessly measuring the characteristic; and d. based on the measured characteristic, determining the external condition.
Claim 19
Independent Claim
107 words
A method of sensing an external condition, the method comprising: a. providing a device for remote sensing comprising an inductor and a capacitor connected to form an electrical circuit having a resonant frequency, the capacitor comprising a pair of conductors separated by a dielectric, the device comprising a material having an intrinsic electrical property altered by an external condition, alteration of the electrical property remotely detectably varying at least one characteristic of the circuit selected from resonant frequency, harmonic spectra and Q factor; b. exposing the device to the external condition; c. wirelessly measuring the characteristic; and d. based on the measured characteristic, determining the external condition.
Claim 20
Dependent Claim
12 words
The method of claim 17 wherein the measurement is a time-domain measurement.
Claim 21
Dependent Claim
12 words
The method of claim 17 wherein the measurement is a frequency-domain measurement.
Claim 22
Dependent Claim
23 words
The method of claim 17 wherein the external condition is at least one of (a) applied force, (b) temperature, (c) humidity, (d) light.
Claim 23
Dependent Claim
24 words
The method of claim 17 wherein the wireless measurement step comprises applying a signal to the device and measuring power reflected from the package.
Claim 24
Dependent Claim
29 words
The method of claim 17 wherein the wireless measurement step comprises applying a signal to the device from a transmit antenna and measuring power received by a receive antenna.
Claim 25
Dependent Claim
27 words
The method of claim 17 wherein the wireless measurement step comprises applying a signal pulse to the device and, after the pulse, measuring ringdown from the device.
Claim 26
Dependent Claim
23 words
The method of claim 17 wherein the wireless measurement step comprises applying a signal to the device and measuring a resulting harmonic spectrum.
Claim 27
Dependent Claim
117 words
The method of claim 17 further comprising the step of providing first and second device each comprising a pair of conductors separated by a dielectric, each device comprising a material having an intrinsic electrical property altered by an external condition, alteration of the electrical property remotely detectably varying at least one characteristic of the circuit selected from resonant frequency, harmonic spectra and Q factor, the variation differing between the devices, and further comprising the steps of: a. simultaneously wirelessly measuring at least one characteristic of the first and second circuits selected from resonant frequency, harmonic spectra and Q factor; and b. based on the measured characteristic, determining the external condition relative to the first and second circuits.
Claim 28
Dependent Claim
11 words
The method of claim 17 wherein the characteristic is resonant frequency.
Claim 29
Dependent Claim
11 words
The method of claim 17 wherein the characteristic is Q factor.
Claim 30
Dependent Claim
11 words
The method of claim 17 wherein the characteristic is harmonic spectra.
Claim 31
Independent Claim
63 words
A method of determining location comprising the steps of: a. providing a plurality of devices, each device comprising a coil and a capacitor forming a circuit having a resonant frequency; b. electrically exciting the devices to produce interacting electrical signals; c. sensing the signals as a function of time; and d. based thereon, determining a location of at least one of the devices.
Claim 32
Independent Claim
63 words
A method of determining location comprising the steps of: a. providing a plurality of devices, each device comprising a coil and a capacitor forming a circuit having a resonant frequency; b. electrically exciting the devices to produce interacting electrical signals; c. sensing the signals as a function of time; and d. based thereon, determining a location of at least one of the devices.
Claim 33
Dependent Claim
17 words
The method of claim 29 wherein the sensing step comprises measuring nonlinear time-domain signals and signal interactions.
Claim 34
Dependent Claim
22 words
The method of claim 29 wherein the sensing step comprising measuring energy at a plurality of frequencies as a function of time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-14 | 2003-08-16 | 2004-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-14 | 2007-08-16 | 2008-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-14 | 2011-08-16 | 2012-02-15 | $7700.00 | Window Closed / Lapsed |