Identification system antenna with impedance transformer
First Claim
Patent Images
1. An electromagnetic device comprising:
- a magnetic core formed in a first loop and a second loop;
an electrical winding package surrounding said magnetic core; and
a strip of electrically conductive material disposed such that said strip passes through both said first loop and said second loop and overlies said electrical winding package, said strip having a width and a thickness wherein said width is substantially greater than said thickness, said strip also having a first end and a second end.
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Abstract
The present invention discloses an electromagnetic device which includes a magnetic flux producing apparatus for producing a magnetic flux path loop. The magnetic flux producing apparatus preferably comprises a magnetic core 20 surrounded by electrical windings 22. A strip of electrically conductive material 24 is disposed such that it passes through the magnetic flux path loop and overlies the windings 22. The strip 24 has a width which is substantially greater than its thickness. The device may further include an antenna 16 which is electrically coupled to the strip 24.
151 Citations
23 Claims
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1. An electromagnetic device comprising:
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a magnetic core formed in a first loop and a second loop; an electrical winding package surrounding said magnetic core; and a strip of electrically conductive material disposed such that said strip passes through both said first loop and said second loop and overlies said electrical winding package, said strip having a width and a thickness wherein said width is substantially greater than said thickness, said strip also having a first end and a second end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An impedance transformer comprising:
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a magnetic core including two side-members laterally spaced in a first direction, said side-members connected by a laterally extending member, said magnetic core defining at least two magnetic flux path loops; an electrical winding surrounding a portion of said laterally extending member and operable to produce a magnetic flux along said magnetic flux path loop; and a strip of electrically conductive material disposed such that said strip passes through said two magnetic flux path loops and over said electrical winding, said strip having a width and a thickness wherein said width is substantially greater than said thickness. - View Dependent Claims (12, 13)
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14. An impedance transformer comprising:
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a magnetic core comprising two side-members laterally spaced in a first direction, said side-members each having first and second ends, said side-members connected by a top laterally extending member at said first ends, a bottom laterally extending member at said second ends and a central laterally extending member disposed between said top and bottom laterally extending members; an electrical winding surrounding said central laterally extending member; and a strip of electrically conductive material disposed such that said strip passes between said top and central laterally extending members and also between said bottom and central laterally extending members, said strip having a width and a thickness wherein said width is substantially greater than said thickness.
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15. An antenna including an impedance transformer comprising:
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a magnetic core formed in a loop; an electrical winding surrounding said magnetic core; a strip of electrically conductive material disposed such that said strip passes through said loop and overlies said electrical winding, said strip having a width and a thickness wherein said width is substantially greater than said thickness, said strip also having a first end and a second end; and an antenna formed from a single loop electrical conductor, said antenna coupled to said strip;
wherein;said magnetic core includes two side-members laterally spaced in a first direction, said side-members each having first and second ends, said side-members connected by a top laterally extending member at said first ends, a bottom laterally extending member at said second ends and a central laterally extending member disposed between said top and bottom laterally extending members; said electrical winding surrounds said central laterally extending member; and said strip passes between said top and central laterally extending members and also between said bottom and central laterally extending members. - View Dependent Claims (16, 17)
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18. An identification system comprising:
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an interrogation unit for communicating with cooperating transponder units, said interrogation unit comprising; an interrogation signal generator; an electrical conductor coupled to said interrogation signal generator; a magnetic core formed in a first loop and a second loop wherein said electrical conductor winds around a portion of said magnetic core which is common to said first and second loops; a strip of electrically conductive material disposed such that said strip passes through said first loop and said second loop and said strip overlies said electrical conductor, said strip having a width and a thickness wherein said width is substantially greater than said thickness; and an antenna coupled to said strip, said antenna for transmitting an interrogation signal generated by said interrogation signal generator; and a transponder unit located in spaced relation with respect to said interrogation unit for receiving said interrogation signal and returning signal information in response to said interrogation signal. - View Dependent Claims (19, 20, 21, 22)
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23. An identification system comprising:
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an interrogation unit for communicating with cooperating transponder units, said interrogation unit comprising; control circuitry; a transmitter for transmission of at least one interrogation signal, said transmitter coupled to said control circuitry; and a receiver for receiving signal information at the termination of said interrogation signal, said receiver coupled to said control circuitry; and a transponder unit located in spaced relation with respect to said interrogation unit for receiving said interrogation signal and returning signal information to said receiver, said transponder unit including; internal transponder circuitry; an electrical conductor coupled to said internal transponder circuitry; a magnetic core formed in a first loop and a second loop wherein said electrical conductor winds around a portion of said magnetic are which is common to said first and second loops; a strip of electrically conductive material disposed such that said strip passes through said first and second loops and overlies said electrical winding, said strip having a width and a thickness wherein said width is substantially greater than said thickness; and an antenna coupled to said strip, said antenna for receiving said interrogation signal from said interrogation unit.
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Specification