MULTIBAND HARVESTING SYSTEMS AND METHODS INCLUDING SWITCHING NETWORKS
First Claim
Patent Images
1. A system comprising:
- a wideband antenna configured to receive wireless signals from at least a first type of signal source configured to transmit in a first frequency band, and at least a second type of signal source configured to transmit in a second frequency band, different from the first frequency band;
a first circuitry branch including;
a first bandpass filter configured to pass at least a portion of the first frequency band;
a first matching network coupled to the first bandpass filter; and
a first rectifier coupled to the first matching network;
a second circuitry branch including;
a second bandpass filter configured to pass at least a portion of the second frequency band;
a second matching network coupled to the first bandpass filter; and
a second rectifier coupled to the first matching network, wherein outputs of the first and second rectifier are configured to couple in series to an output;
a first switch positioned to disconnect the first rectifier from the output when a voltage provided by the first rectifier is below a first threshold; and
as second switch positioned to disconnect the second rectifier from the output when a voltage provided b the second rectifier is below a second threshold.
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Abstract
Examples described herein include systems and methods for multiband harvesting. An example system may include a single wideband antenna followed by several narrowband rectifier chains. Each rectifier chain may include a bandpass filter, a tuned impedance matching network, and a rectifier. The outputs of the rectifiers may be combined using a summation network. The summation network, which may be a diode summation network, may in some examples provide good performance even when only a subset o the narrowband harvesters (e.g. a subset of the rectifier chains) is excited.
24 Citations
25 Claims
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1. A system comprising:
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a wideband antenna configured to receive wireless signals from at least a first type of signal source configured to transmit in a first frequency band, and at least a second type of signal source configured to transmit in a second frequency band, different from the first frequency band; a first circuitry branch including; a first bandpass filter configured to pass at least a portion of the first frequency band; a first matching network coupled to the first bandpass filter; and a first rectifier coupled to the first matching network; a second circuitry branch including; a second bandpass filter configured to pass at least a portion of the second frequency band; a second matching network coupled to the first bandpass filter; and a second rectifier coupled to the first matching network, wherein outputs of the first and second rectifier are configured to couple in series to an output; a first switch positioned to disconnect the first rectifier from the output when a voltage provided by the first rectifier is below a first threshold; and as second switch positioned to disconnect the second rectifier from the output when a voltage provided b the second rectifier is below a second threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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a wideband antenna configured to receive wireless signals over a first frequency range; a plurality of circuitry branches, each of the plurality of circuitry branches including; a respective bandpass filter to pass a different respective frequency range, each different respective frequency range being narrower than the first frequency range; and a respective rectifier coupled to the respective bandpass filter, the respective rectifier configured to rectify a signal received from the respective bandpass filter; wherein an output of a plurality of respective rectifiers are configured to be coupled in series to an output; and a switching network coupled to the output and configured to disconnect selected one or ones of the plurality of respective rectifiers from the output - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method comprising;
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receiving wireless signals at an antenna; filtering the wireless signals into at least two frequency bands to provide at least two filtered signals; rectifying each of the at least two filtered signals to provide respective rectified signals; and combining selected ones of the respective rectified signals to provide an output voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification