RFID ANTENNA SYSTEM
First Claim
1. A dielectric loaded antenna array element, comprising:
- a dielectric layer;
a metallic patch supported on a first side of the dielectric layer;
a ground plane layer on an opposite second side of the dielectric layer;
antenna feed network connected to antenna terminals; and
one or more slots in the ground plane layer, coupled to the antenna feed network, for exciting the metallic patch through the dielectric layer, each slot having a narrow central section and an increased area end section at each end of the narrow central section which increases the bandwidth of the antenna element as compared to a constant width slot having the same width as the narrow central section.
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Accused Products
Abstract
A multi-protocol, multi-band array antenna system may be used in Radio Frequency Identification (RFID) system reader and sensory networks. The antenna array may include array elements with an integrated low noise amplifier. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in an cell. The receive beam forming network is optimized for detecting signals from each sensor tag. Narrow and wideband interferences may be excised by an interference nulling algorithm. Space division multiplexing may be used by the antenna system to enhance system processing capacity.
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Citations
10 Claims
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1. A dielectric loaded antenna array element, comprising:
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a dielectric layer;
a metallic patch supported on a first side of the dielectric layer;
a ground plane layer on an opposite second side of the dielectric layer;
antenna feed network connected to antenna terminals; and
one or more slots in the ground plane layer, coupled to the antenna feed network, for exciting the metallic patch through the dielectric layer, each slot having a narrow central section and an increased area end section at each end of the narrow central section which increases the bandwidth of the antenna element as compared to a constant width slot having the same width as the narrow central section. - View Dependent Claims (2, 3)
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4. An antenna array element, comprising:
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an antenna feed network connected to antenna terminals; and
a square metallic patch driven by the antenna feed network, each side of the patch including a slot having a first end in the center of the edge, a second end towards the center of the patch and an opening in the patch at each second end of each slot to increase the effective electrical wavelength of the antenna array element. - View Dependent Claims (5, 6)
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7. An antenna array element, comprising:
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an antenna feed network connected to antenna terminals;
a metallic patch element separated from the antenna feed network by a dielectric; and
a pair of metallic connection elements connected between the metallic patch element and the antenna feed network, each metallic connection element having a sufficient cross sectional area so that the pair of metallic connection elements operates as a matching network for circularly polarized antenna signals. - View Dependent Claims (8, 9, 10)
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Specification