Smartcard and method of making

• US 5,892,661 A
• Filed: 10/31/1996
• Issued: 04/06/1999
• Est. Priority Date: 10/31/1996
• Status: Expired due to Term

• Current Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Stafford, John W., Jandzinski, David A., Tessier, Theodore G.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US08/741,793
• Time in Patent Office: 887 Days
• Field of Search: 361/728, 361/737, 361/748, 361/750, 361/751, 361/752, 361/760, 361/762, 361/763, 257/679, 343/700 R, 343/895, 235/488
• US Class Current: 361/737
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/0775 arrangements for connecting the integrated circuit to the antenna
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07783 the coil being planar

Abstract

A smartcard (10) is formed in part by a laminate layer (77). The laminate layer (77) is made up of a plurality of dielectric layers (11,30), insulating layers (45, 50), resistive layers (55), and electrically active structures. The electrically active structures include a capacitive structure (23) which is formed from one of the dielectric layers (11) and an antennae (32) which is made from a conductive layer that is formed into a spiral pattern on the another dielectric layer (30). These layers (11,30, 45, 50, 55) are formed separately and then pressed together to form the laminate layer (77).

Claims

1. A smartcard comprising:

a first layer of dielectric material having a top surface;

a conductive layer overlying the top surface of the first layer of dielectric material, wherein the conductive layer has a spiral pattern;

a second layer of dielectric material having a top surface and a bottom surface, wherein the first layer of dielectric material is overlying the second layer of dielectric material;

a first conductive plate overlying the top surface of the second layer of dielectric material;

a second conductive plate below the bottom surface of the second layer of dielectric material, wherein at least a portion of the first conductive plate is overlying the second conductive plate;

an electronic component that is electrically coupled to the conductive layer; and

wherein the first layer of dielectric material and the second layer of dielectric material provide at least a portion of a laminate layer.

2. The smartcard of claim 1 wherein the conductive layer is an antennae that is capable of receiving a radio frequency signal and the antennae provides an electric current to the electronic component.

3. The smartcard of claim 1 wherein the second layer of dielectric material has a hole passing from the top surface to the bottom surface, the hole being filled with a conductive material.

4. The smartcard of claim 3 further comprising an electrical connection between the conductive layer having a spiral pattern and the first conductive plate, wherein the conductive material in the hole in the second layer of dielectric material provides at least a portion of the electrical connection.

5. The smartcard of claim 1 wherein the second layer of dielectric material has a dielectric constant ranging from about 3 to 30.

6. The smartcard of claim 5 wherein the first layer of dielectric material has a dielectric constant of about 3 to 15.

7. The smartcard of claim 1 further comprising a layer of resistive material overlying the second layer of dielectric material, the layer of resistive material providing a resistor that is electrically coupled to the electronic component.

8. The smartcard of claim 1 wherein the second layer of dielectric material comprises a material selected from the group consisting of polytetrafluoroethylene, epoxy glass materials, polyimide, quartz, kevelar, and liquid crystal polymer.

9. The smartcard of claim 8 wherein the second layer of dielectric material includes a filler material selected from the group consisting of ceramic, silica, and artificial diamond.

10. The smartcard of claim 1 wherein both the conductive layer and the second layer of dielectric material have a surface area, and the surface area of the second layer of dielectric material is greater than or equal to the surface area of the conductive layer.

11. The smartcard of claim 1 wherein both the first conductive plate and the second layer of dielectric material have a surface area, and the surface area of the second layer of dielectric material is greater than the surface area of the first conductive plate.

12. The smartcard of claim 1 further comprising an insulating layer between the first layer of dielectric material and the second layer of dielectric material.

13. An electronic component assembly comprising:

a layer of dielectric material having a top surface and a bottom surface;

a first conductive plate overlying the top surface of the layer of dielectric material;

a second conductive plate below the bottom surface of the layer of dielectric material, wherein the first conductive plate, layer of dielectric material, and the second conductive plate provide a capacitor structure;

an electronic component;

an antennae that is electrically coupled to the electronic component and the first conductive plate; and

wherein the layer of dielectric material, the first conductive plate, and the second conductive plate provide at least a portion of a laminate layer.

14. The electronic component assembly of claim 13 wherein the antennae is on the top surface of the layer of dielectric material.

15. The electronic component assembly of claim 14 wherein the antennae is a layer of conductive material having a spiral pattern.

16. The electronic component assembly of claim 13 wherein the layer of dielectric material has a dielectric constant of about 3 to 30.

17. The electronic component assembly of claim 13 wherein the layer of dielectric material and the first conductive plate have a surface area, and the surface area of the layer of dielectric material is greater than the surface area of the first conductive plate.

18. A smartcard comprising:

a first layer of dielectric material having a top surface and a bottom surface;

a first conductive plate overlying the top surface of the first layer of dielectric material;

a second conductive plate below the bottom surface of the first layer of dielectric material, wherein at least a portion of the first conductive plate is overlying the second conductive plate;

a second layer of dielectric material, wherein the first layer of dielectric material is overlying the second layer of dielectric material;

an antennae on the second layer of dielectric material;

a layer of resistive material overlying the first layer of dielectric material;

an electronic component, wherein the first conductive plate, the antennae, and the layer of resistive material are electrically coupled to the electronic component; and

wherein the first layer of dielectric material and the second layer of dielectric material provide at least a portion of a laminate layer.

19. The smartcard of claim 18 wherein the first layer of dielectric material has a surface area that is greater than a surface area of the antennae.

20. The smartcard of claim 19 wherein the first layer of dielectric material has a dielectric constant ranging from about 12 to 30 and the second layer of dielectric material has a dielectric constant ranging from about 3 to 15.

21. A method of making a smartcard comprising the steps of:

providing a first layer of dielectric material having a surface area, a top surface, and a bottom surface;

forming a first metal layer on the top surface and the bottom surface of the first layer of dielectric material;

patterning the first metal layer to form a first conductive plate on the top surface of the first layer of dielectric material;

patterning the first metal layer to form a second conductive plate on the bottom surface of the first layer of dielectric material, wherein at least a portion of the first conductive plate is overlying the second conductive plate;

providing a second layer of dielectric material having a top surface;

forming a second metal layer on the top surface of the second layer of dielectric material;

patterning the second metal layer to form an antennae having a spiral pattern;

placing the first layer of dielectric material over the second layer of dielectric material; and

pressing the first layer of dielectric material towards the second layer of dielectric material to form a laminate layer.

22. The method of claim 21 further comprising the step of placing an electronic component between the first layer of dielectric material and the second layer of dielectric component becomes part of the laminate layer.

23. The method of claim 21 further comprising the steps of:

providing a layer of resistive material; and

placing the layer of resistive material overlying the second layer of dielectric material prior to the step of pressing so that the layer of resistive material becomes part of the laminate layer.

24. The method of claim 21 further comprising the steps of:

forming a hole from the top surface of the first layer of dielectric material to the bottom surface of the first layer of dielectric material; and

forming in part an electrical connection between the antennae and the first conductive plate by filling the hole in the first layer of dielectric material with a conductive material.