Antenna system
First Claim
1. An antenna system comprising:
- a base;
a first patch antenna disposed on said base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields; and
a second patch antenna disposed on said base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields, said second antenna being disposed at a distance from said first antenna to define a region between said first antenna and said second antenna, said second patch antenna being oriented relative to said first patch antenna such that electric and magnetic fields of the two antennas are substantially opposing in said region.
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0 Petitions
Accused Products
Abstract
An antenna system for a radio frequency identification system comprising: (a) a base; (b) a first patch antenna disposed on the base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields; and (c) a second patch antenna disposed on the base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields, the second antenna being disposed at a distance from the first antenna to define a region between the first and the antenna, the second patch antenna being positioned relative to the first patch antenna such that the electromagnetic fields of the two antennas are substantially opposing in the region.
16 Citations
19 Claims
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1. An antenna system comprising:
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a base; a first patch antenna disposed on said base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields; and a second patch antenna disposed on said base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields, said second antenna being disposed at a distance from said first antenna to define a region between said first antenna and said second antenna, said second patch antenna being oriented relative to said first patch antenna such that electric and magnetic fields of the two antennas are substantially opposing in said region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna system comprising:
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a base a first patch antenna mounted on said base and comprising a first circular surface defining a first slot and being capable of transmitting a circularly polarized signal, said first patch antenna comprising a first feed point at a first position within said first circular surface; and a second patch antenna mounted on said base comprising a second circular surface defining a second slot orthogonal to said first slot, and being capable of receiving a return signal from a tag, said second circular surface being about the same size as said first circular surface, said second patch antenna comprising a second feed point in a second position on said second circular surface; wherein said system has an axis that runs through the center of said first and second antennas, and wherein said first and second positions are located on different sides of the said axis. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A radio frequency identification (RFID) system comprising:
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a controller; an interrogator communicatively linked to said controller and comprising at least a transmitter, a receiver, and an antenna system; and said antenna system comprising at least; a base; a first patch antenna mounted on said base and connected to said transmitter, said first patch antenna comprising a first circular surface defining a first slot and being capable of transmitting a circularly polarized signal to a tag, and a feed point in a first position within said first circular surface; and a second patch antenna mounted on said base and connected to said receiver, said second patch antenna comprising a second circular surface defining a second slot orthogonal to said first slot, and being capable of receiving a return signal from a tag, said second circular surface being about the same size as said first circular surface, said second patch antenna comprising a feed point in a second position within said second circular surface; wherein said system has an axis that runs through the center of said first and second antennas, and wherein said first and second positions are located on different sides of the said axis. - View Dependent Claims (18, 19)
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Specification