RFID antenna system
First Claim
Patent Images
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;
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; and
wherein the one or more slots comprises of four slots, two of which are each driven by one of the antenna terminals to cause circular polarization of the antenna element; and
wherein the metallic square patch, the slots are each positioned generally on each side of the metallic square patch and the slots are shaped so that nearest edges of slots in adjacent corners are separated from each other sufficiently to achieve relatively low cross-polarization there between.
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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.
62 Citations
8 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; 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; and wherein the one or more slots comprises of four slots, two of which are each driven by one of the antenna terminals to cause circular polarization of the antenna element; and wherein the metallic square patch, the slots are each positioned generally on each side of the metallic square patch and the slots are shaped so that nearest edges of slots in adjacent corners are separated from each other sufficiently to achieve relatively low cross-polarization there between. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification