Dual antenna coil transponder system
First Claim
Patent Images
1. An interrogator for a radio frequency identification device comprising, an antenna driver circuit;
- a first antenna;
a second antenna; and
a splitter circuit communicatively coupled to said antenna driver circuit such that said splitter circuit splits a drive current generated by said antenna driver circuit into substantially similar first and second antenna currents directed to said first and second antennas, respectively.
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Abstract
The present invention relates to a dual antenna coil identification system, and more particularly, to an interrogator or reader for inductively coupling to a transponder and thereby extract data from the transponder. The magnetic field required to energize a transponder is generated by currents flowing through two essentially identical but opposite phased antenna coils arranged near the area where tags are to be read.
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Citations
9 Claims
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1. An interrogator for a radio frequency identification device comprising,
an antenna driver circuit; -
a first antenna;
a second antenna; and
a splitter circuit communicatively coupled to said antenna driver circuit such that said splitter circuit splits a drive current generated by said antenna driver circuit into substantially similar first and second antenna currents directed to said first and second antennas, respectively. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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2. An interrogator comprising,
an antenna driver circuit; -
a splitter circuit communicatively coupled to the antenna driver circuit to receive a drive signal and split the drive signal into balanced drive signals;
a first antenna communicatively coupled to the splitter circuit to receive said first balanced drive signal;
a second antenna communicatively coupled to the splitter circuit to receive said second balanced drive signal; and
a receiver communicatively coupled to the first and second antennas to receive and decode a transponder signal obtained by said first and second antennas.
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3. A field effect detector/interrogator to detect a variations in an electro magnetic field comprising;
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an antenna driver;
a first antenna;
a second antenna; and
a splitter circuit communicatively coupled to said antenna driver such that said splitter splits a drive current signal generated by said antenna driver into a substantially similar first and second antenna drive signals directed to said first and second antennas respectively; and
a difference current detector communicatively coupled to said splitter to measure any differential currents imposed on the first and second antennas.
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Specification