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 having an overall length that is at least twice the wavelength of the carrier signal, 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 a first end to a common feed-point and has a second end, wherein the two electrically conductive elements form a loop-like shape with a gap between the second ends of the two electrically conductive elements, and wherein the second ends of the two electrically conductive elements are directed toward one another.
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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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19 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 having an overall length that is at least twice the wavelength of the carrier signal, 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 a first end to a common feed-point and has a second end, wherein the two electrically conductive elements form a loop-like shape with a gap between the second ends of the two electrically conductive elements, and wherein the second ends of the two electrically conductive elements are directed toward one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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