Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
1998-12-21
2001-04-10
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C361S753000, C174S051000
Reexamination Certificate
active
06215063
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
REFERENCE TO A “MICROFICHE APPENDIX”
Not Applicable
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates in general to an improved radio frequency component and a method of making it. The invention more particularly relates to a radio frequency component, which is environmentally protected and which is thus more reliable and dependable in its operation.
2. Background Art
There have been many different types and kinds of surface mounted radio frequency components which interact with signals having frequencies between approximately one kilohertz and approximately 26 gigahertz. Such radio frequency components require the use of circuit boards having a number of traces thereon to cooperate with components having electronic devices on a carrier. A pair of input/output pads or contact areas located on the underside of the surface of the carrier member are connected to the electronic devices to provide an external connection point to the circuit board traces by suitable techniques such as soldering.
In order to facilitate the arrangement of the radio frequency components on the circuit board in a more compact manner, a method and device shown in U.S. Pat. No. 5,444,187 was invented to facilitate the closely spaced surface mounting of the components on the circuit board. The U.S. Pat. No. 5,444,187 is incorporated herein by reference. Such a technique reduced greatly the need for customizing the radio frequency components and increased the component density on the circuit board. Additionally, the circuit board layout design requirements were greatly simplified.
As disclosed in U.S. Pat. No. 5,444,187, the method briefly relates to the use of radio frequency components having input/output contact points or areas at corners of the underside of the component. This arrangement permits the component to be positioned relative to a pair of circuit board traces for enabling an electrical connection thereto in a range of angular dispositions, thereby facilitating greatly the increase of component density and enabled greater freedom in arranging advantageously the components on the circuit board without requiring expensive customization of the components.
While such a patented technique has proven to be highly successful, there still remains the draw back associated with all surface mounted radio frequency components relating to inherent unreliability due to moisture encroachment and RF shielding (prevention of RF interference with other adjacent components. In this regard, radio frequency components including electronic devices such as filters are adversely affected by moisture caused by condensation from temperature variations, or from the use of the radio frequency component in outside environments. Also, moisture encroachment can be caused by spraying solutions such as cleaning agents, solvents or conformal coatings onto the carrier.
Such unwanted moisture encroachment can cause short circuiting or other undesirable affects such as de-tuning a filter device. Additionally, other components such as capacitors and inductors do not perform satisfactorily when wet. Additionally, other environmental problems such as dust particles or the like infiltrating the surface mounted radio frequency component can cause undesirable and unwanted affects as well. Therefore, it would be highly desirable to have a new and improved radio frequency component, which performs more satisfactorily and reliably and is protected against unwanted environmental problems.
SUMMARY OF THE INVENTION
Therefore, the principal object of the present invention is to provide a new and improved radio frequency component and a method of making it, wherein the inventive radio frequency component is more highly reliable and dependable.
Another object of the present intention is to provide such a new and improved radio frequency component and method of making it, wherein the inventive radio frequency component is protected against undesirable and unwanted environmental pollutants and RF shielding.
Briefly, the above and further objects of the present invention are realized by providing a new and improved radio frequency component and a method of making it to enhance its reliable and efficient operation.
A radio frequency component and a method of making it relates to a radio frequency component, which includes a carrier member having an electronic device connected electrically a pair of lead attachment members on the upper surface thereof and having on its underside surface an annular perimeter ground trace conductor portion disposed adjacent to the carrier peripheral edge portion and extending between each lead attachment member and the carrier peripheral edge. A cup shaped lid having a hollow interior and a rim for engaging electrically the annular ground tract conductor portion to seal over an environmentally protected space including the electronic device to protect against unwanted environmental pollutant encroachment. Plug members are disposed in plated through holes extending through the carrier for further sealing off the protected space.
REFERENCES:
patent: 4996630 (1991-02-01), Liguori etal.
Lem Rafael G.
Lopez Luis W.
Baier & Baier, Inc.
Foley & Lardner
Kleinke Bernard L.
Ngo Hung V
Reichard Dean A.
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