Patent US5541399A successfully refreshed from Google Patents.
US5541399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF transponder with resonant crossover antenna coil
Assignee: Assa Abloy AB
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Filing: 1994-09-30
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Granted: 1996-07-30
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Expires: 2014-09-30
Abstract
Abstract An RF transponder couples the outer end of a coiled antenna winding to a transponder circuit located inside the winding by a lead line that crosses over the winding turns and is separated from the winding by a dielectric material. The width of the lead line is substantially greater than the antenna line width, yielding capacitances at the cross-over sites that establish a resonant frequency for communicating with the transponder circuit at a predetermined RF frequency. An optional discrete capacitor can also be used to boost the capacitance to a desired level. All of the transponder components are formed on one side of a flexible substrate, the opposite side of which is coated with an adhesive that is covered by a peel-off sheet, allowing the transponder to be affixed to packages as part of a package identification system.
Inventors
- 👤 Franklin B. de Vall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:08
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/077; G06K19/07749; G06K19/0775; G06K19/0723; G06K19/0726; G06K19/07758; G06K19/0776; G06K19/07773; G06K19/07777; G06K19/07779; G06K19/07783; G06K7/00; G06K7/0008
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
137 words
An RF radio frequency transponder, comprising: a substrate, an electrical transponder circuit on said substrate, an antenna coil on said substrate formed from multiple turns of an antenna line, with spaced locations on said antenna connected to couple an RF input signal to said circuit, one of said antenna locations being connected to said circuit through a lead that extends along a path that includes crossovers of the antenna turns, and a dielectric material separating said lead from said antenna turns at said crossovers to produce cross-over capacitances between said lead and said antenna turns, the width of said lead being substantially greater than the width of said antenna line at said crossovers to yield cross-over capacitances that collectively establish a resonant frequency for communicating with said circuit through said antenna coil at a predetermined RF frequency.
Claim 2
Dependent Claim
137 words
An RF radio frequency transponder, comprising: a substrate, an electrical transponder circuit on said substrate, an antenna coil on said substrate formed from multiple turns of an antenna line, with spaced locations on said antenna connected to couple an RF input signal to said circuit, one of said antenna locations being connected to said circuit through a lead that extends along a path that includes crossovers of the antenna turns, and a dielectric material separating said lead from said antenna turns at said crossovers to produce cross-over capacitances between said lead and said antenna turns, the width of said lead being substantially greater than the width of said antenna line at said crossovers to yield cross-over capacitances that collectively establish a resonant frequency for communicating with said circuit through said antenna coil at a predetermined RF frequency.
Claim 3
Dependent Claim
19 words
The RF transponder of claim 1, wherein said lead is at least ten times wider than said antenna line.
Claim 4
Dependent Claim
26 words
The RF transponder of claim 1, said transponder circuit including a capacitor that adds to said crossover capacitances to establish said resonant frequency for the transponder.
Claim 5
Dependent Claim
17 words
The RF transponder of claim 3, wherein said capacitor is discrete from the remainder of said circuit.
Claim 6
Dependent Claim
26 words
The RF transponder of claim 4, wherein the remainder of said circuit is fabricated on an IC inte-grated circuit chip that is adhered to said substrate.
Claim 7
Dependent Claim
49 words
The RF transponder of claim 4, said capacitor comprising a pair of conductive sheets, with one of said sheets adhered to said substrate and the other sheet adhered to the first sheet by a dielectric adhesive, said capacitor having a substantially larger area than the remainder of said circuit.
Claim 8
Dependent Claim
25 words
The RF transponder of claim 6, wherein said circuit, antenna coil, antenna lead and capacitor are all located on the same side of said substrate.
Claim 9
Dependent Claim
32 words
The RF transponder of claim 1, wherein said transponder circuit stores an identification code that is read out by energizing said antenna coil with an RF signal at said predetermined RF frequency.
Claim 10
Dependent Claim
24 words
The RF transponder of claim 1, wherein said circuit, antenna coil and antenna lead are all located on the same side of said substrate.
Claim 11
Dependent Claim
25 words
The RF transponder of claim 9, further comprising an adhesive on the opposite side of said substrate from said circuit, antenna coil and antenna lead.
Claim 12
Dependent Claim
14 words
The RF transponder of claim 10, further comprising a peel-off cover over said adhesive.
Claim 13
Dependent Claim
15 words
The RF transponder of claim 10, wherein said substrate is formed from a flexible material.
Claim 14
Dependent Claim
23 words
The RF transponder of claim 10, wherein said circuit is fabricated on an IC inte-grated circuit chip that is adhered to said substrate.
Claim 15
Dependent Claim
154 words
An RF transponder, comprising: a substrate, an electrical circuit on said substrate that includes a memory storage for an identification code, a multi-turn antenna on the same side of said substrate as said circuit, said antenna communicating with said circuit to energize the circuit and to radiate an identification code stored in said memory in response to a received RF signal at a predetermined resonant frequency, a capacitor on the same side of said substrate as said circuit, said capacitor formed by a lead that is electrically connected to said antenna and crosses over the turns of said antenna on the same side of said substrate as said antenna to produce crossover capacitances between said lead and said turns, thereby to collectively establish a resonant frequency for said transponder, and an adhesive on the opposite side of said substrate from said circuit and antenna for adhering the transponder to a body to be identified.
Claim 16
Dependent Claim
154 words
An RF transponder, comprising: a substrate, an electrical circuit on said substrate that includes a memory storage for an identification code, a multi-turn antenna on the same side of said substrate as said circuit, said antenna communicating with said circuit to energize the circuit and to radiate an identification code stored in said memory in response to a received RF signal at a predetermined resonant frequency, a capacitor on the same side of said substrate as said circuit, said capacitor formed by a lead that is electrically connected to said antenna and crosses over the turns of said antenna on the same side of said substrate as said antenna to produce crossover capacitances between said lead and said turns, thereby to collectively establish a resonant frequency for said transponder, and an adhesive on the opposite side of said substrate from said circuit and antenna for adhering the transponder to a body to be identified.
Claim 17
Dependent Claim
14 words
The RF transponder of claim 14, further comprising a peel-off cover over said adhesive.
Claim 18
Dependent Claim
15 words
The RF transponder of claim 14, wherein said substrate is formed from a flexible material.
Claim 19
Dependent Claim
23 words
The RF transponder of claim 14, wherein said circuit is fabricated on an IC inte-grated circuit chip that is adhered to said substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |