Methods of enhancing electronmagnetic radiation properties of encapsulated circuit, and related devices

• US 5,963,177 A
• Filed: 05/16/1997
• Issued: 10/05/1999
• Est. Priority Date: 05/16/1997
• Status: Expired due to Term

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Communications, Inc. (Micron Technology, Inc.)
• Inventors: Tuttle, Mark E., Lake, Rickie C.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Ho, Tan
• Application Number:
  US08/858,026
• Time in Patent Office: 872 Days
• Field of Search: 343/741, 343/742, 343/866, 343/867, 343/872, 342/51, 340/505, 340/572, 340/825.54, 29/600
• US Class Current: 343/872
• 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 19/07786 the antenna being of the HF type, such as a dipole

Abstract

Methods of forming electronic signal transmitting/receiving devices and electronic signal transmitting/receiving devices are described. In one implementation, integrated circuitry including transponder circuitry is provided and operatively coupled with an antenna to provide a transmitting/receiving circuit. A matrix material comprising suspension structure is formed and applied over at least a portion of the antenna, the suspension structure being selected to manipulate an operating characteristic of the transmitting/receiving circuit. According to a preferred aspect of the invention, the operating characteristic comprises an electrical length of the antenna and the application of the matrix material effectively increases the electrical length to resonate the antenna at a desired frequency. According to another preferred aspect of the invention, the suspension structure comprises calcium carbonate.

Claims

1. A method of forming an electronic signal transmitting/receiving device comprising:

providing an integrated circuit including transponder circuitry configured for processing electronic signals;

providing an antenna configured for transmitting/receiving electronic signals, the antenna being operatively coupled with the integrated circuit to define a transmitting/receiving circuit;

forming matrix material comprising suspension structure therewithin; and

applying the matrix material over at least a portion of the antenna, the suspension structure being selected to manipulate at least one operating characteristic of the transmitting/receiving circuit.

2. The method of claim 1, wherein the at least one operating characteristic comprises an effective electrical length of the antenna.

3. The method of claim 1, wherein:

the at least one operating characteristic comprises an electrical length of the antenna; and

the applying of the matrix material effectively increases the electrical length of the antenna.

4. The method of claim 1, wherein the transmitting/receiving circuit is configured for processing radio frequencies of less than about 30 GHz.

5. The method of claim 1, wherein the transmitting/receiving circuit is configured for processing radio frequencies of less than about 3 GHz.

6. The method of claim 1, wherein the suspension structure comprises calcium carbonate.

7. The method of claim 1, wherein the suspension structure is selected from the group consisting of:

polyimide, SiO₂, fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons.

8. The method of claim 1, wherein the antenna is configured to transmit microwave backscatter.

9. A method of forming an electronic signal transmitting/receiving device comprising:

providing an integrated circuit configured for processing electronic signals;

operatively connecting an antenna with the integrated circuit, the antenna being configured for transmitting/receiving electronic signals;

providing a matrix material;

selecting at least one desired filler material to achieve a desired electronic operating parameter;

adding said at least one desired filler material to said matrix material; and

forming said matrix material with said at least one desired filler material over at least a portion of said antenna.

10. The method of claim 9, wherein the desired electronic operating parameter comprises a resonant frequency.

11. The method of claim 9, wherein the antenna is configured to transmit microwave backscatter.

12. The method of claim 9, wherein:

the desired electronic operating parameter comprises a resonant frequency; and

the antenna has an actual length and an effective electrical length, the effective electrical length being selected for the desired electronic operating parameter, the forming of the matrix material effectively changing the effective electrical length of the antenna.

13. The method of claim 9, wherein:

the desired electronic operating parameter comprises a resonant frequency; and

the antenna has an actual length and an effective electrical length, the effective electrical length being selected for the desired electronic operating parameter, the forming of the matrix material effectively lengthening the effective electrical length of the antenna.

14. The method of claim 9, wherein the antenna includes an exposed outer surface and the forming of said matrix material comprises forming said matrix material over all of the exposed outer surface.

15. The method of claim 9, wherein the desired electronic operating parameter comprises a resonant frequency in a range from between about 1 GHz to 30 GHz.

16. The method of claim 9, wherein the desired electronic operating parameter comprises a resonant frequency of approximately 2.45 GHz.

17. The method of claim 9, wherein the at least one desired filler material comprises calcium carbonate.

18. The method of claim 9, wherein the at least one desired filler material is selected from the group consisting of:

polyimide, SiO₂ fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons.

19. A method of forming an electromagnetic radiation signal passing device comprising the following steps:

providing an integrated circuit;

providing a power source for the integrated circuit;

providing at least one electromagnetic radiation signal passing antenna associated with the integrated circuit, the antenna having an outer surface;

operably connecting the integrated circuit, power source and antenna; and

covering the antenna outer surface with a solid material matrix comprising a suspension of solid particles, the solid particles being selected to adjust an electronic operating parameter of the antenna.

20. The method of claim 19, wherein the antenna is configured to transmit microwave backscatter.

21. The method of claim 19, wherein the covering of the antenna outer surface adjusts an electronic operating parameter comprising a resonant frequency of the antenna.

22. The method of claim 19, wherein:

the connecting of the integrated circuit, power source and antenna comprises supporting the same relative to a substrate; and

the covering of the antenna outer surface comprises;

forming a flowable material over the substrate; and

curing the flowable material to provide the solid material matrix.

23. The method of claim 19, wherein:

the connecting of the integrated circuit, power source and antenna comprises supporting the same relative to a substrate; and

the covering of the antenna outer surface comprises;

forming a flowable material over the substrate; and

curing the flowable material to provide the solid material matrix, wherein the solid particles comprise calcium carbonate.

24. The method of claim 19, wherein:

the connecting of the integrated circuit, power source and antenna comprises supporting the same relative to a substrate; and

the covering of the antenna outer surface comprises;

forming a flowable material over the substrate; and

curing the flowable material to provide the solid material matrix, wherein the solid particles are selected from the group consisting of;

polyimide, SiO₂, fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons.

25. The method of claim 19, wherein the covering of the antenna outer surface adjusts an electronic operating parameter comprising a resonant frequency of the antenna, the adjusted resonant frequency being in a range from between about 1 GHz to 30 GHz.

26. The method of claim 19, wherein:

the connecting of the integrated circuit, power source and antenna comprises supporting the same relative to a substrate; and

the covering of the antenna outer surface comprises;

forming a flowable material over the substrate; and

curing the flowable material to provide the solid material matrix, wherein;

the solid particles are selected from the group consisting of;

polyimide, SiO₂, fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons; and

the covering of the antenna outer surface adjusts an electronic operating parameter comprising a resonant frequency, the adjusted resonant frequency being in a range from about between 1 GHz to 30 GHz.

27. A method of forming a radio frequency identification device comprising the following steps:

providing an integrated circuit comprising radio frequency transmitting and receiving circuitry;

providing a battery power source for the integrated circuit;

providing at least one radio signal passing antenna associated with the transmitting and receiving circuitry, the antenna having an outer surface;

operably connecting the integrated circuit, battery power source and antenna;

covering the antenna outer surface with a flowable material comprising a suspension of solid particles, the solid particles being selected to affect the frequency at which the antenna resonates; and

curing the flowable material into a hardened antenna coating.

28. The method of claim 27, wherein the solid particles comprise calcium carbonate.

29. The method of claim 27, wherein the solid particles are selected from the group consisting of:

polyimide, SiO₂, fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons.

30. The method of claim 27, wherein the antenna resonates at a frequency from between 1 GHz to 30 GHz.

31. The method of claim 27, wherein the antenna resonates at a frequency of about 2.45 GHz.

32. The method of claim 27, wherein the antenna has an actual length and an effective electrical length, the effective electrical length characterizing an antenna resonant frequency, and wherein the covering of the antenna increases the effective electrical length of the antenna relative to the actual length of the antenna.

33. A method of manipulating resonance characteristics of an elongated antenna comprising:

providing an elongated antenna having an actual length and an outer surface; and

covering at least a portion of the antenna outer surface with a solid material matrix comprising a suspension of solid particles, the solid particles being selected to achieve an effective antenna electrical length which is greater than the antenna actual length, the antenna electrical length being associated with resonance characteristics which are different from those associated with the antenna actual length.

34. The method of claim 33, wherein:

the providing of the elongated antenna comprises forming the antenna relative to a substrate; and

the covering of the antenna comprises forming a flowable material over the substrate and curing the flowable material to provide the solid material matrix.

35. A method of forming a radio frequency transmitting/receiving card comprising:

providing an antenna having a first length which is less than a desired second length, the second length being characterized by a desired resonant frequency, the antenna having an outer surface;

covering at least a portion of the antenna outer surface with a solid material matrix comprising a suspension of solid particles, the solid particles being selected to comprise a material, volume and density within the matrix effective to increase the first length to an effective length substantially equal to the desired second length and to achieve the desired resonant frequency for operable passage of radio frequency signals; and

packaging the antenna with integrated circuitry coupled operatively therewith to form a radio frequency receiving/transmitting card having a thickness no greater than about 90 mils.

36. The method of claim 35, wherein the thickness is no greater than about 40 mils.

37. The method of claim 35, wherein the thickness is greater than about 30 mils.

38. The method of claim 35, wherein the second length is effective to resonate the antenna at a frequency between 200 MHz and 10 GHz.

39. The method of claim 35, wherein the solid particles comprises calcium carbonate.

40. The method of claim 35, wherein the solid particles are selected from the group consisting of:

polyimide, SiO₂, fluoropolymer, glass, titanium dioxide, calcium carbonate, calcium sulfate, and micro glass balloons.

41. The method of claim 35, wherein the card is configured for transmitting microwave backscatter relative to received microwave radiation.

42. The method of claim 35, wherein:

the antenna comprises a loop antenna; and

the packaging of the antenna with the integrated circuitry defines a radio frequency receiving/transmitting card having an outer periphery, at least a substantial portion of the antenna being disposed inside the outer periphery.

43. A method of forming a radio frequency receiving/transmitting device comprising:

providing an integrated circuit configured for processing radio frequency signals;

operatively coupling a battery with the integrated circuit;

providing an elongate antenna operatively connected with the integrated circuit and configured for receiving/transmitting radio frequency signals;

providing a matrix material;

selecting at least one desired filler material and adding the filler material to the matrix material to form a coating material;

forming the coating material over at least a portion of the antenna, wherein the filler material is selected to manipulate an electronic operating characteristic of the radio frequency receiving/transmitting device; and

packaging the integrated circuit, battery, and antenna in a package to form the radio frequency receiving/transmitting device.

44. The method of claim 43, wherein:

the packaging of the integrated circuit, battery, and antenna defines a package perimetral edge region; and

the elongate antenna comprises a loop antenna at least a portion of which extends inside the perimetral edge region.

45. The method of claim 43, wherein:

the packaging of the integrated circuit, battery, and antenna defines a package perimetral edge region; and

the elongate antenna comprises a loop antenna which extends entirely inside the perimetral edge region.

46. The method of claim 43, wherein the electronic operating characteristic comprises an effective electrical length of the antenna.

47. The method of claim 43, wherein the electronic operating characteristic comprises an electrical length of the antenna the manipulation of which increases the electrical length thereof.

48. The method of claim 43, wherein the device comprises a card having at least one generally planar surface and wherein the packaging of the integrated circuit, battery, and antenna in the package defines a package having a thickness transverse the planar surface of less or equal to about 90 mils.

49. A radio frequency transmitting/receiving device comprising:

integrated circuitry configured for processing radio frequency signals;

a battery operatively coupled with the integrated circuitry, the battery having an outer perimeter;

an elongate antenna operatively coupled with the integrated circuitry for transmitting/receiving radio frequency signals, a substantial portion of the antenna being disposed proximate the outer perimeter of the battery;

coating material including at least one type of filler material selected to manipulate an electronic operating characteristic of the radio frequency transmitting/receiving device, the coating material being disposed over at least a portion of the antenna; and

packaging material formed over the integrated circuitry, battery, and antenna and encapsulating the same to form the radio frequency transmitting/receiving device having a thickness no greater than about 30 mils.