LARGE SCALE FOLDED DIPOLE ANTENNA FOR NEAR-FIELD RFID APPLICATIONS
First Claim
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1. An antenna assembly for use with a predetermined carrier signal having a predetermined frequency and wavelength associated therewith, comprising:
- a dipole antenna, the dipole antenna including two electrically conductive elements of unequal lengths that are also not simple multiples of each other so that when transmitting at the wavelength of the carrier signal, at least one moving null is created within the dipole antenna, wherein each of the two electrically conductive elements is connected at one end to a common feed-point and has another end, wherein the two electrically conductive elements form a loop-like shape with a small gap between the another end of each of the two electrically conductive elements.
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Abstract
In accordance with a preferred embodiment of the invention, reader antennas are provided within storage fixtures or supporting fixtures for transporting RF signals between, for example, an RFID reader and an RFID tag. In a preferred embodiment, the RFID-enabled fixtures are implemented using an intelligent network, which may allow enhanced flexibility in controlling systems for interrogation of RFID antennas.
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Citations
25 Claims
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1. An antenna assembly for use with a predetermined carrier signal having a predetermined frequency and wavelength associated therewith, comprising:
a dipole antenna, the dipole antenna including two electrically conductive elements of unequal lengths that are also not simple multiples of each other so that when transmitting at the wavelength of the carrier signal, at least one moving null is created within the dipole antenna, wherein each of the two electrically conductive elements is connected at one end to a common feed-point and has another end, wherein the two electrically conductive elements form a loop-like shape with a small gap between the another end of each of the two electrically conductive elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of eliminating reception dead-spaces for a plurality of stationery RFID tagged items using a stationery RFID reader dipole antenna associated therewith that transmits at a predetermined carrier signal having a predetermined frequency and wavelength associated therewith to each of the plurality of stationery RFID tagged items, the method comprising the steps of:
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providing the stationery RFID reader dipole antenna with two electrically conductive elements of unequal lengths that are also not simple multiples of each other so that when transmitting at the wavelength of the carrier signal, at least one moving null is created within the stationery RFID reader dipole antenna, wherein each of the two electrically conductive elements is connected at one end to a common feed-point and has another end, wherein the two electrically conductive elements form a loop-like shape with a small gap between the another end of each of the two electrically conductive elements; and causing the stationery RFID reader dipole antenna to transmit the carrier signal to the plurality of stationery RFID tagged items so that the carrier signal within the stationery RFID reader dipole antenna will have at least one moving null created therein, wherein the moving null substantially eliminates the reception dead spaces that could otherwise occur between the stationery RFID reader dipole antenna and the plurality of stationery RFID tagged items. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification