Radio frequency identification (RFID) tags and methods of communicating between a radio frequency identification (RFID) tag and an interrogator
First Claim
1. A radio frequency identification (RFID) tag, comprising:
- a loop antenna formed upon a first surface of the RFID tag, the loop antenna operable to receive communications signals;
a dipole antenna formed upon the first surface of the RFID tag, the dipole antenna having a first half and a second half and operable to output communications signals, the first half of the dipole antenna having a first antenna port, and the second half of the dipole antenna having a second antenna port;
wherein the loop antenna and the dipole antenna are separated on the first surface by a distance corresponding to one wavelength of the communications signals; and
a switch coupled to the first and second antenna ports and operable to electrically short or electrically isolate the first and second halves of the dipole antenna.
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Accused Products
Abstract
The present invention provides communication devices, communication systems and methods of communicating. According to one embodiment of the invention, a communication device includes: a first antenna operable to receive wireless communication signals; a second antenna having plural leads, the second antenna being operable to output wireless communication signals; a connection including plural conductive lines having respective first ends and second ends, the connection being coupled with the leads of the second antenna at the first ends of the lines; and a switch coupled with the second ends of the connection, the switch being operable to provide one of selective shorting and isolation of the leads. One method of communicating of the invention includes: forming a first antenna; forming a second antenna; receiving wireless interrogation signals using the first antenna; outputting wireless identification signals using the second antenna; opening a coupling intermediate plural leads of the second antenna during the receiving; selectively shorting the leads of the second antenna during the outputting; and providing a low load impedance of the second antenna during the receiving.
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Citations
20 Claims
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1. A radio frequency identification (RFID) tag, comprising:
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a loop antenna formed upon a first surface of the RFID tag, the loop antenna operable to receive communications signals; a dipole antenna formed upon the first surface of the RFID tag, the dipole antenna having a first half and a second half and operable to output communications signals, the first half of the dipole antenna having a first antenna port, and the second half of the dipole antenna having a second antenna port;
wherein the loop antenna and the dipole antenna are separated on the first surface by a distance corresponding to one wavelength of the communications signals; anda switch coupled to the first and second antenna ports and operable to electrically short or electrically isolate the first and second halves of the dipole antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency Identification (RFID) tag, comprising:
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a first antenna operable to receive command communications signals; a dipole antenna having a first section and a second section, the dipole antenna being operable to output reply communications signals, wherein the first antenna and the dipole antenna are separated by a distance corresponding to one wavelength of the reply communications signals; and a switch coupled to the first and second dipole antenna sections and operable to electrically connect or electrically insulate the first and second sections of the dipole antenna. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of communicating between a radio frequency identification (RFID) tag and an interrogator comprising:
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providing, on the RFID tag, a first antenna operable to receive command communications signals and a second antenna operable to output reply communications signals, the second antenna having two sections, and wherein the first antenna and the second antenna are separated on the RFID tag by a distance corresponding to one wavelength of the reply communications signals; providing a switch coupled to the two sections of the second antenna, the switch operable to electrically connect or electrically insulate the two sections of the second antenna; forming a reply signal by switching the two sections of the second antenna between a connected state and an insulated state; and transforming a load impedance of the second antenna to a low impedance during a receive mode of the RFID tag. - View Dependent Claims (19, 20)
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Specification