Multi-band antenna rectifier codesign for ambient energy harvesting
AssigneeQUALCOMM Incorporated
InventorsKamala Raghavan Sadagopan, Elizabeth Wyrwich
Life of this patent
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Abstract
A multi-band ambient energy harvesting apparatus is disclosed. The apparatus may comprise: at least one antenna that is electrically tuned to multiple frequency bands; and a rectifier electrically coupled to the at least one antenna, where the rectifier is electrically tuned to the multiple frequency bands of the at least one antenna, the at least one antenna has a first reactance, the rectifier has a second reactance, and the second reactance is approximately equal to a negative value of the first reactance at each of the multiple frequency bands to cause the at least one antenna to resonate at the multiple frequency bands.
Claims19
An apparatus for multi-band ambient energy harvesting, the apparatus comprising:
- at least one antenna that is electrically tuned to multiple frequency bands including a first frequency band and a second frequency band;
- and
- a single rectifier electrically coupled to the at least one antenna, wherein
- the rectifier is electrically tuned to the multiple frequency bands of the at least one antenna,
- the at least one antenna has a first reactance that has a first value of the first reactance at the first frequency band and a second value of the first reactance at the second frequency band, the first value of the first reactance being different from the second value of the second reactance, and
- the rectifier has a second reactance, that has a first value of the second reactance at the first frequency band and a second value of the second reactance at the second frequency band, the first value of the second reactance being equal to a negative value of the first value of the first reactance at the first frequency band and the second value of the second reactance being equal to a negative value of the second value of the second reactance at the second frequency band, to cause the at least one antenna to resonate at the multiple frequency bands.
A dual-band antenna rectifier codesign device for ambient energy harvesting, the dual-band antenna rectifier codesign device comprising:
- a dual-band antenna that is electrically tuned to two frequency bands;
- and
- a rectifier electrically coupled to the dual-band antenna;
- wherein
- the rectifier is electrically tuned to the two frequency bands of the dual-band antenna,
- the dual-band antenna has a first reactance,
- the rectifier has a second reactance that is equal to a negative value of the first reactance at each of the two frequency bands to cause the dual-band antenna to resonate at the two frequency bands, and
- wherein the dual-band antenna is a dual-band inductive loop antenna that includes
- a loop antenna element electrically coupled to the rectifier, and
- a parasitic structure electromagnetically coupled to the loop antenna element,
- wherein
- the loop antenna element has a variable inductance that varies as a function of frequency and is produced by a loop antenna inductance of the loop antenna element and an electromagnetic coupling of the parasitic structure to the loop antenna element,
- the rectifier has a variable capacitance that varies as a function of frequency, and
- the variable capacitance and the variable inductance combine to cause the dual-band antenna to resonate at each of the two frequency bands.
Dependencies are inferred from the claim text.