 Electrical contact material |
| We claim: 1. An electrical contact material comprising from 85 to 87.5 percent silver, by weight ... |
|
| Electrically conductive foam mouldings |
| What we claim is: 1. A process for making molded electrically conductive foam products which ... |
|
| Electrically conductive plastics materials and process for their production |
| We claim: 1. A method of producing a thermoplastically further processable, electrically conductive ... |
|
| Preparation of electrically conductive polymers |
| We claim: 1. A process for the preparation of a stable electrically conductive polymer from a ... |
|
| All-weather precision landing system for aircraft in remote areas |
| A principal object of the present invention is to provide an improved passive reflector system for ... |
|
| Unlocked W-band receiver with coherent features |
| To meet the above and other objectives, the present invention provides for a coherent radar ... |
|
| Differential fuse circuit and method utilized in an analog to digital converter |
| Other objects and advantages will be obvious, and will in part appear hereinafter and will be ... |
|
| Method and apparatus for encoding video signals in 3-D blocks without detecting image motion |
| One object of the present invention is to provide a coding method and a coding apparatus capable of ... |
|
| Manipulation of graphic structures using inverse kinematics |
| The invention addresses manipulation of a graphic structure (or a portion of a graphic structure) ... |
|
| Instant response broadcast board system and method |
| The object of the present invention is to provide an instant response broadcast board method and ... |
|
|
Low cost thin film magnetodielectric material
| Details |
Inventors: Purinton, Donald L.; Kesler, Oren B.;
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Examiner: Leary; Louise N.
Assistant Examiner:
Attorney, Agent or Firm: Valetti; Mark A., Brady, III; Wade James, Donaldson; Richard L.
A device and method of making the device for regulating electromagnetic radiations in a predetermined frequency range, which comprises a substrate and a coating mixture on a surface of the substrate. The coating mixture is provided by mixing together: (a) a plurality of flakes of a magnetic or ferrite material having substantial length and width dimensions relative to their thickness, the thickness of substantially all of the flakes being less than the skin depth of all frequencies in the predetermined frequency range, (b) at least one surfactant, (c)) a vaporizable electrically insulating material and (d) a solvent. The mixture is sprayed onto the surface of the substrate, either with or without a magnetic field at the surface, and the solvent is removed to retain the flakes on the substrate spaced from each other by the electrically insulating material and disposed substantially parallel to the portion of the plane of the surface thereunder. The substrate can be any one of at least an automobile, an aircraft, an electronic enclosure, a portion of a building, a tower causing electromagnetic interference or a location for placement of an antenna. The device is preferably an absorber for electromagnetic radiations, particularly for use on the surfaces of a mobile device such as an automobile, aircraft or personal electronic device. The flakes are any magnetic or ferrite material than can be provided in flake form in the thickness range required. |
|
DETAILED DESCRIPTION We claim: 1.
A device for regulating electromagnetic radiations in a predetermined frequency range, which comprises: (a) a substrate; and (b) a coating on a surface of said substrate which comprises: (i) a plurality of flakes of at least one of magnetic or ferrite material having substantial length and width dimensions relative to their thickness to provide two opposing major surfaces, one of their two major surfaces disposed substantially parallel to the portion of the plane of said surface thereunder; (ii) the thickness of substantially all of said flakes being less than the skin depth of all frequencies in said predetermined frequency range; and (iii) a vaporizable electrically insulating material spacing said flakes from each other.
2.
The device of claim 1 wherein said device is one of a mobile vehicle or personal electronic device and said coating is an electromagnetic wave absorber for an antenna.
3.
The device of claim 1 wherein said flakes are selected from the group consisting of magnetic stainless steel, 80Ni/20Fe, sendust (FeSi/Al), amorphous CoZrNb, amorphous CoFeBSi, 95Co/5Fe, amorphous CoZrNd, CoCr and amorphous TbFe.
4.
The device of claim 2 wherein said flakes are selected from the group consisting of magnetic stainless steel, 80Ni/20Fe, sendust (FeSi/Al), amorphous CoZrNb, amorphous CoFeBSi, 95Co/5Fe, amorphous CoZrNd, CoCr and amorphous TbFe.
5.
The device of claim 1 wherein said electrically insulating material is selected from the group consisting of urethanes, polyesters, epoxys, cyanate esters, polyimides, silicones, synthetic rubbers and Neoprene, nitriles, polyisoprene, fluoroelastomer, butyl and buna N elastomers and silanes, silazanes, siloxanes and ceramic sol gels inorganic polymers.
6.
The device of claim 2 wherein said electrically insulating material is selected from the group consisting of urethanes, polyesters, epoxys, cyanate esters, polyimides, silicones, synthetic rubbers and Neoprene, nitriles, polyisoprene, fluoroelastomer, butyl and buna N elastormers and silanes, silazanes, siloxanes and ceramic sol gels inorganic polymers
|
| Related patents |
|
|
Electromagnetic wave absorbing sheet
A principal object of this invention is to provide an electromagnetic wave absorbing sheet which, comprises a nonwoven fabric sheet including one or a plurality of ...
|
|
|
Insulated heat shield with waved edge
The present invention provides an improved insulated heat shield for engine components, such as exhaust manifolds of internal combustion engines. In the described ...
|
|
|
Method and apparatus for manufacturing dimpled structures from elastic cloth
An object of this invention is, therefore, to provide a method of forming complex shapes with foamable polyimide precursor materials. Another object is to provide a ...
|
|
|
Averaging-area-constrained adaptive interferometric filter that optimizes combined coherent and noncoherent averaging
To meet the above and other objectives, the present invention provides for adaptive filters and filtering methods for use with coherent computed imaging systems. The ...
|
|
|
Reflector circuit
According to the present invention, there is provided a reflector circuit for receiving illuminating radiation and emitting corresponding amplified output radiation, the ...
|
|
|
Method for preventing the agglomeration or generation of dust from a particulate material comprising coal
The invention claimed is: 1. A method of preventing the agglomeration of a particulate material comprising coal and the adhesion thereof to surfaces in subfreezing ...
|
|
|
Titanium-polymer hybrid laminates
The invention provides hybrid laminates, including layers of titanium alloy foil alternating with layers of a polymeric matrix with reinforcing fibers embedded therein, ...
|
|
|
Anechoic chamber absorber and method
The present invention is directed to an anechoic chamber absorber, and method for making the anechoic chamber absorber from honeycomb, which is relatively lightweight, ...
|
|
|
Ceramic honeycomb and method
OF THE PREFERRED METHODS Honeycomb material can be made in two basic ways. The first is to take sheets or webs of material, which have typically been preimpregnated ...
|
|
|
Piezoelectric/electrostrictive film element
OF THE DRAWINGS The above and optional objects, features and advantages of the present invention will be better understood by reading the following detailed description ...
|
|
|
Radio 
