Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Reexamination Certificate
1998-02-05
2001-10-02
Paladini, Albert W. (Department: 2841)
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
C174S202000, C029S852000, C156S155000, C428S209000
Reexamination Certificate
active
06297459
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to low dielectric constant porous materials and, more particularly, to a process for using porous layers in printed circuit boards.
2. Description of the Related Art
Electronic circuits have inherent limitations in high frequency applications. For example, capacitive loading is increased at higher frequencies because capacitive reactance is directly proportional to frequency. In high frequency circuits capacitive loading becomes so high that a semiconductor chip cannot drive the low reactive impedance. Because these high frequency circuits have historically been power inefficient, their usefulness in airborne and satellite applications is limited.
Porous polytetrafluoroethylene (PTFE) materials such as GORE-TEXT® (GORE-TEX is a trademark of W.L. Gore & Associates, Inc., of Newark, Del.) have excellent low dielectric constant properties, but unfortunately they absorb process chemicals in their pores during MCM (multi-chip module) or PC (printed circuit) board processing that cannot be removed. Additionally, the fact that the porous material becomes crushed during pressurized processing destroys its porous properties, and therefore the deformed material does not provide the desired consistent low dielectric constant.
In microwave circuit chip structures, certain electrical conductor paths in sensitive areas of the chip circuitry require a dielectric constant close to that of air (
1
) to work properly in these areas. Chip manufacturers fabricate air bridges to provide the low dielectric constant. These sensitive air bridge structures create processing challenges for both the manufacturer and the end user. Even Teflon polytetrafluoroethylene (Teflon is a trademark of E.I. DuPont de Nemours and Co.), which typically has a dielectric constant between 1.9 and 2.0, can create too much of an impedance loading effect at microwave frequencies.
The DuPont Teflon polytetrafluoroethylene materials have intrinsically low dielectric constants and have the necessary high temperature stability for most industrial and military uses. As described in Gore, U.S. Pat. No. 3,962,153, and Gore, U.S. Pat. No. 4,096,227, GORE-TEX® material is a Teflon PTFE-based material that is filled with micro-pores that create a foam-like cloth material. Porous PTFE material is generally used in clothes to simultaneously provide warmth and allow perspiration and moisture vapors to vent through its pores. Porous PTFE material is alternatively sold as a filled porous PTFE material. Filling the pores with a material such as an acrylate glue enables use of the material as a laminant film; however, this causes the resultant dielectric constant to degrade and limits the material's usefulness at high frequencies. Unfilled porous PTFE material is an excellent candidate for high frequency circuits because the dielectric constant can be significantly less than that found in other materials. However, in laminant applications and processing, the pores can collapse under pressure and/or be filled with processing materials during fabrication which cannot be easily removed.
Ceramic foam materials are discussed, for example, in “Giants in advanced ceramics,” Ceramic Industry, vol. 141, 47 (August 1993), and Te-Kao Wu, “Dielectric properties measurement of substrate and support materials,” Microwave and Optical Technology Letters, vol. 3, 283-286 (August 1990). These materials, however, are inflexible and not fabricated in large area sections. Because the ceramic foam materials are inflexible and cannot be stretched, they can be used as substrates but cannot be used in overlay technologies that are not perfectly flat. Because ceramic foam materials are fragile, they are typically not capable of withstanding PC board lamination processing in their intrinsic state. Furthermore, ceramic foam materials can be filled with processing materials which degrade their low dielectric constant.
Another problem common to both porous PTFE material and ceramic foam material is that if the porous/foam material is to be used in any process in which a metallization layer is applied over the material, the metal tends to extend into the pores and it is thus difficult to achieve a smooth and continuous metal surface for use in high frequency applications where skin-effect related losses are of importance.
Few intrinsically low dielectric constant materials can withstand the high temperatures in commercial and military processing. Most of the low dielectric constant materials that can withstand higher temperatures are only absorptive below the 200 nanometer wavelength region of the light spectrum, and thus it is nearly impossible to process those materials using ion argon and other CW (continuous wave) lasers.
PC boards typically have dielectric constants ranging from 2 through 5, and nonporous ceramics can have dielectric constants as high as 9. It would be desirable to have a low dielectric constant PC board material for use in high frequency and high speed electronics.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a new material and method of manufacturing high frequency and high speed electronic circuits with low power capabilities.
Another object of this invention is to provide a method for processing low dielectric constant porous materials which does not leave process chemicals behind in the porous materials.
Another object of this invention is to provide low dielectric constant polymer PC boards.
This invention modifies a low dielectric constant polymeric porous material, such as porous PTFE material, which has a dielectric constant of approximately 1.2-1.3, by filling the material's pores with a sublimable (or otherwise removable) material that prevents deformation during processing and enables laser processing during high speed circuit fabrication. The term “low dielectric constant” is intended to mean a dielectric constant as close to 1 as possible and not greater than about 2. After processing, the filler material is removed, and the original porous material is left with the intrinsically low dielectric constant. The process, which enables foam-like materials to be laminated and laser machined without the use of solvents or other chemical processing, can be used in PC boards, MCM modules, and anywhere else low dielectric constant surfaces are desired.
Porous PTFE material is approximately 70% air and is generally made by stretching PTFE to cause approximately nine billion holes per square inch to be distributed evenly throughout its volume. The resulting structure is a filter type material in that gas or liquid can pass through the interconnected pores. This porous structure is composed of mostly air and can readily be filled with a sublimable material. The resulting porous material can be used as a low dielectric constant material in the manufacture of high frequency circuits and can reduce the need for laser ablation of material situated over air bridge structures and other microwave structures and devices.
Briefly, in accordance with a preferred embodiment of the invention, a method for fabricating a low dielectric constant printed circuit board comprises dispersing an additive material in a low dielectric constant porous polymer layer; providing holes through the low dielectric constant porous polymer layer; applying a metallization layer over surfaces of the low dielectric constant porous polymer layer and surfaces of the holes; patterning the metallization layer; and removing the additive material from the low dielectric constant porous polymer layer.
In accordance with another preferred embodiment of the invention, a low dielectric constant printed circuit board comprises a low dielectric constant porous polymer layer having holes therethrough and a patterned metallization layer over surfaces of the low dielectric constant porous polymer layer and surfaces of the holes.
REFERENCES:
patent: 2012617 (1935-08-01), Munters
patent: 3576686 (1971-04-01), Schmidle et al.
patent: 3681186 (1972-08-01), Fin
Cole Herbert Stanley
Daum Wolfgang
Sitnik-Nieters Theresa Ann
Wojnarowski Robert John
Agosti Ann M.
Breedlove Jill M.
General Electric Company
Paladini Albert W.
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