EP0704816A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
RF transponder with resonant crossover antenna coil
Assignee: HID Global Corp
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Filing: 1995-09-27
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Granted: —
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Expires: 2015-09-27
Abstract
Abstract An RF transponder couples the outer end (14) of a coiled antenna winding (4) to a transponder circuit (8) located inside the winding (4) by a lead line (16) that crosses over the winding turns and is separated from the winding (4) by a dielectric material. The width of the lead line (16) is substantially greater than the antenna line width, yielding capacitances at the crossover sites that establish a resonant frequency for communicating with the transponder circuit (8) at a predetermined RF frequency. An optional discrete capacitor (20) 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 (2), 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 a part of a package identification system.
Inventors
- 👤 Franklin B. De Vall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:51
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: 17
Claim 1
Independent Claim
151 words
An RF (radio frequency) transponder, comprising: a substrate (2), an electrical transponder circuit (8) on said substrate (2), an antenna coil (4) on said substrate (2) formed from multiple turns of an antenna line (6), with spaced locations (12, 14) on said antenna (4) connected to couple an RF input signal to said circuit (8), one (14) of said antenna locations (12, 14) being connected to said circuit (8) through a lead (16) that crosses over the antenna turns, and a dielectric material (18) separating said lead (16) from said antenna turns at said cross overs to produce crossover capacitances between said lead (16) and said antenna turns, the width (w) of said lead (16) being substantially greater than the width of said antenna line (6) to yield crossover capacitances that establish a resonant frequency for communicating with said circuit (8) through said antenna coil (4) at a predetermined RF frequency.
Claim 2
Dependent Claim
23 words
The RF transponder of claim 1, characterized in that said lead (16) is at least ten times wider than said antenna line (6).
Claim 3
Dependent Claim
33 words
The RF transponder of claim 1 or claim 2, characterized in that said transponder circuit includes a capacitor (20) that adds to said crossover capacitances to establish said resonant frequency for the transponder.
Claim 4
Dependent Claim
20 words
The RF transponder of claim 3, characterized in that said capacitor (20) is discrete from the remainder of said circuit.
Claim 5
Dependent Claim
29 words
The RF transponder of claim 4, characterized in that the remainder of said circuit is fabricated on an IC (integrated circuit) chip (8) that is adhered to said substrate.
Claim 6
Dependent Claim
66 words
The RF transponder of claim 4 or claim 5, characterized in that said capacitor (20) comprises a pair of conductive sheets (22, 24), with one (24) of said sheet (22, 24) adhered to said substrate (2) and the other sheet (22) adhered to the first sheet (24) by a dielectric adhesive (26), said capacitor (20) having a substantially larger area than the remainder of said circuit.
Claim 7
Dependent Claim
36 words
The RF transponder of any of claims 3 - 6, characterized in that said circuit (8), antenna coil (4), antenna lead (16) and capacitor (20) are all located on the same side of said substrate (2).
Claim 8
Dependent Claim
39 words
The RF transponder of any of claims 1 - 7, characterized in that said transponder circuit stores an identification code that is read out by energizing said antenna coil (4) with an RF signal at said predetermined RF frequency.
Claim 9
Dependent Claim
30 words
The RF transponder of claim 1, characterized in that said circuit (8), antenna coil (4) and antenna lead (16) are all located on the same side of said substrate (2).
Claim 10
Dependent Claim
34 words
The RF transponder of any of claims 1 - 9, characterized by an adhesive (28) on the opposite side of said substrate (2) from said circuit (8), antenna coil (4) and antenna lead (16).
Claim 11
Dependent Claim
16 words
The RF transponder of claim 10, characterized by a peel-off cover (30) over said adhesive (28).
Claim 12
Dependent Claim
22 words
The RF transponder of any of claims 1 - 10, characterized in that said substrate (2) is formed from a flexible material.
Claim 13
Dependent Claim
32 words
The RF transponder of any of claims 1 - 12, characterized in that said circuit (8) is fabricated on an IC (integrated circuit) chip (8) that is adhered to said substrate (2).
Claim 14
Dependent Claim
101 words
An RF transponder, comprising: a substrate (2), an electrical circuit (8) on said substrate (2) that includes a memory storage (60b) for an identification code, a multi-turn antenna (4) on the same side of said substrate (2) as said circuit (8), said antenna (4) communicating with said circuit (8) to energize the circuit (8) and to radiate its identification code in response to a received RF signal at a predetermined resonant frequency, and an adhesive (28) on the opposite side of said substrate (2) from said circuit (8) and antenna (4) for adhering the transponder to a body to be identified.
Claim 15
Dependent Claim
16 words
The RF transponder of claim 14, characterized by a peel-off cover (30) over said adhesive (28).
Claim 16
Dependent Claim
21 words
The RF transponder of claim 14 or claim 15, characterized in that said substrate (2) is formed from a flexible material.
Claim 17
Dependent Claim
32 words
The RF transponder of any of claims 14 - 16, characterized in that said circuit (8) is fabricated on an IC (integrated circuit) chip (8) that is adhered to said substrate (2).
References Cited (Backward Citations)
US4598276A
Cited
US4730188A
Cited
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