RF POWER EXTRACTING CIRCUIT AND RELATED TECHNIQUES
First Claim
1. A far-field power extraction circuit comprising:
- an antenna configured to receive an electromagnetic signal having a resonant frequency and to match an antenna input impedance with a remainder of the far-field power extraction circuit; and
a rectifier coupled to the antenna, the rectifier being configured to rectify an electromagnetic signal provided thereto by the antenna to produce a direct current (DC) voltage at a rectifier output.
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Accused Products
Abstract
In one aspect, the invention is a far-field power extraction circuit which includes an integrated antenna and impedance matching portion and a rectifier portion. The antenna and impedance matching portion includes an antenna configured to be responsive to a propagating electromagnetic signal and which provides a resonant response at a resonant frequency. In response to the electromagnetic signal, the antenna provides an electromagnetic output signal at an antenna port. The antenna and impedance matching portion is configured to match an antenna impedance with a remainder of the far-field power extraction circuit including the rectifier portion of the power extraction circuit coupled to the antenna and impedance matching portion. The rectifier is configured to rectify the electromagnetic output signal provided by the antenna to produce a direct current (DC) voltage at an output of the rectifier.
75 Citations
22 Claims
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1. A far-field power extraction circuit comprising:
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an antenna configured to receive an electromagnetic signal having a resonant frequency and to match an antenna input impedance with a remainder of the far-field power extraction circuit; and
a rectifier coupled to the antenna, the rectifier being configured to rectify an electromagnetic signal provided thereto by the antenna to produce a direct current (DC) voltage at a rectifier output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A far-field power extraction circuit comprising:
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an antenna configured to receive an electromagnetic signal; and
a multi-stage rectifier coupled to the antenna, the multi-stage rectifier being configured to rectify an electromagnetic signal provided thereto by the antenna to produce a direct current (DC) voltage at a rectifier output, the multi-stage rectifier comprising N stages, where N>
1,wherein the multi-stage rectifier comprises at least one circuit element having a nonlinear capacitive characteristic. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A far-field power extraction circuit comprising:
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an antenna configured to receive an electromagnetic signal, said antenna having a resonant frequency and configured to subsequently match an antenna impedance with a remainder of the far-field power extraction circuit at the resonant frequency; and
a multi-stage rectifier coupled to the antenna, the multi-stage rectifier adapted to receive an electromagnetic signal from the antenna and in response thereto, to produce a direct current (DC) voltage at a rectifier output, the multi-stage rectifier comprising N stages, where N>
1,wherein the multi-stage rectifier comprises at least one circuit element having a nonlinear capacitance characteristic. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification