WIRELESS SENSOR INCLUDING AN RF SIGNAL CIRCUIT
First Claim
1. A wireless sensor comprises:
- an antenna structure operable to receive a radio frequency (RF) signal;
an RF signal circuit operable to, when enabled, produce the RF signal;
a sensing element operably coupled to the antenna structure, wherein, in a calibration mode, the sensing element is exposed to a known condition and causes a first change of an operating characteristic of the antenna structure while receiving the RF signal and wherein, in a sense mode, the sensing element is exposed to an unknown condition and causes a second change of the operating characteristic of the antenna structure while receiving the RF signal;
memory; and
a processing module operable to;
in the calibration mode;
generate a first digital value based on the first change of the operating characteristic, wherein the first digital value is representative of the known condition; and
write the first digital value into the memory; and
in the sense mode;
generate a second digital value based on the second change of the operating characteristic, wherein the second digital value is representative of the second change corresponding to the unknown condition; and
write the second digital value into the memory.
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Accused Products
Abstract
A wireless sensor includes an antenna structure, an RF signal circuit, a sensing element, memory and a processing module. In a calibration mode, the sensing element is exposed to a known condition and causes a first change of an operating characteristic of the antenna structure while receiving the RF signal. The processing module generates a first digital value based on the first change and writes it into the memory. In a sense mode, the sensing element is exposed to an unknown condition and causes a second change of an operating characteristic of the antenna structure while receiving the RF signal. The processing module generates a second digital value based on the second change and writes it into the memory.
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Citations
17 Claims
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1. A wireless sensor comprises:
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an antenna structure operable to receive a radio frequency (RF) signal; an RF signal circuit operable to, when enabled, produce the RF signal; a sensing element operably coupled to the antenna structure, wherein, in a calibration mode, the sensing element is exposed to a known condition and causes a first change of an operating characteristic of the antenna structure while receiving the RF signal and wherein, in a sense mode, the sensing element is exposed to an unknown condition and causes a second change of the operating characteristic of the antenna structure while receiving the RF signal; memory; and a processing module operable to; in the calibration mode; generate a first digital value based on the first change of the operating characteristic, wherein the first digital value is representative of the known condition; and write the first digital value into the memory; and in the sense mode; generate a second digital value based on the second change of the operating characteristic, wherein the second digital value is representative of the second change corresponding to the unknown condition; and write the second digital value into the memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An active wireless sensor comprises:
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a battery; a power circuit operably coupled to generate a power supply voltage from the battery; an antenna structure operable to receive a radio frequency (RF) signal; an RF signal circuit operable to, when enabled, produce the RF signal; a sensing element operably coupled to the antenna structure, wherein, when the sensing element is exposed to a condition, the sensing element causes a change of an operating characteristic of the antenna structure while receiving the RF signal; memory operably coupled to the power supply circuit; and a processing module operably coupled to the power supply circuit and to the memory, wherein the processing module is operable to; generate a digital value based on the change of the operating characteristic, wherein the digital value is representative of the condition; and write the digital value into the memory. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification