RFID devices using metamaterial antennas
First Claim
Patent Images
1. A radio frequency identifier (RFID) system comprising:
- an RFID chip;
an antenna comprising a patch cell stack that includes two or more patch cells; and
a feed line electrically coupling the RFID chip to the antenna,wherein the antenna is configured to support a plurality of frequency bands, each frequency band of the plurality of frequency bands having a center frequency,wherein the size of the antenna is a portion of a wavelength corresponding to a maximum of the center frequencies, andwherein a patch cell of the two or more patch cells has a size of less or equal to one tenth of the wavelength corresponding to the maximum of the center frequencies.
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Abstract
A radio frequency identifier (RFID) tag can comprise an RFID chip, an antenna provided by a patch cell stack; and a feed line electrically coupling the RFID chip to the antenna. An equivalent circuit for the patch cell stack can comprise at least one inductance group comprising at least two series inductances, and at least one shunt capacitance. The antenna can have a composite right- and left-handed (CRLH) structure.
71 Citations
16 Claims
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1. A radio frequency identifier (RFID) system comprising:
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an RFID chip; an antenna comprising a patch cell stack that includes two or more patch cells; and a feed line electrically coupling the RFID chip to the antenna, wherein the antenna is configured to support a plurality of frequency bands, each frequency band of the plurality of frequency bands having a center frequency, wherein the size of the antenna is a portion of a wavelength corresponding to a maximum of the center frequencies, and wherein a patch cell of the two or more patch cells has a size of less or equal to one tenth of the wavelength corresponding to the maximum of the center frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio frequency identifier (RFID) tag comprising:
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an RFID chip; an antenna comprising a patch cell stack that includes two or more patch cells; and a feed line electrically coupling the RFID chip to the antenna, wherein the antenna is configured to support a plurality of frequency bands, each frequency band of the plurality of frequency bands having a center frequency, and wherein each patch cell of the two or more patch cells has a size of less or equal to one tenth of a wavelength corresponding to a maximum of the center frequencies. - View Dependent Claims (13)
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14. A radio frequency identifier (RFID) tag comprising:
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an antenna comprising a patch cell stack that includes two or more patch cells; and a feed line electrically coupled to the antenna, wherein the antenna is configured to support a plurality of frequency bands, each frequency band of the plurality of frequency bands having a center frequency, and wherein a patch cell of the two or more patch cells has a size of less or equal to one tenth of a wavelength corresponding to a maximum of the center frequencies. - View Dependent Claims (15, 16)
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Specification