System for absorbing electromagnetic waves and method of manufacturing this system
OwnerGunter Nimtz, Achim Endersinventors
Life of this patent
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Abstract
In order to absorb electromagnetic waves in a measurement chamber, the sidewalls and the ceiling of the chamber are lined with contiguous pyramids (20). The pyramid vertices point into the chamber. The structure element (20) has a frame (22) formed by bars made of an electrically insulating glass fiber material and an outer skin (24). The outer skin is cut out of a surface resistance material web. The surface resistance material web is produced by continuously or almost continuously coating a mechanically flexible support web with an electroconductive layer made of a metallic material.
Claims36
A system for the broad band absorption of electromagnetic waves, wherein a plurality of thin surface resistance layers are arranged in a three-dimensional configuration,
- each of said surface resistance layers comprising
- a) a first layer of a mechanically flexible sheet material having a layer thickness less than 5 mm;
- b) at least one second layer composed of a material selected from a group of materials consisting of an electrically conductive material and a semiconductive material,
- said at least one second layer being applied to said first layer, said first layer forming a carrier layer for said second layer,
- said second layer having a thickness in the range from 5 nm to 1,000 nm and having a uniform and constant surface resistance distribution, said second layer being substantially continuously manufactured by a process selected from the group of powder coating and deposition processes.
A system for the broad band absorption of electromagnetic waves, wherein a plurality of mechanically flexible surface resistance layers are arranged in a three-dimensional configuration, each of said surface resistance layers being formed from a single carrier layer comprising an organic conductor which has a uniform and constant surface resistance distribution, said surface resistance layer being substantially continuously manufactured with a layer thickness less than 5 mm.
A method of manufacturing a system for the broad band absorption of electromagnetic waves, said method comprising the steps of:
- a) providing a web of a mechanically flexible sheet material said sheet material having a thickness of less than 5 mm;
- b) coating said web of mechanically flexible sheet material with an at least weakly conductive material in a substantially continuous process so as to form at least one surface resistance layer at a thickness in the range from 5 nm to 1,000 mm, said at least one surface resistance layer having a substantial uniform and constant surface resistance distribution, thereby obtaining a web of a surface resistance sheet material;
- c) forming a plurality of surface resistance sections from said web of surface resistance sheet material;
- d) providing three-dimensional structures adapted to define geometrical bodies, said bodies having three dimensional shapes selected from the group of shapes consisting of pyramid-, wedge-, cone-, and step-shapes;
- and
- e) covering said three dimensional structures with said surface resistance sections formed in step c) to form absorber elements shaped as defined by said three-dimensional structures.
A method of manufacturing a system for the broad band absorption of electromagnetic waves, said method comprising the steps of
- a) providing a web of a mechanically flexible sheet material said sheet material having a thickness of less than 5 mm;
- b) coating said web of mechanically flexible sheet material with an at least weakly conductive material in substantially continuous process so as to form at least one surface resistance layer at a thickness in the range from 5 nm to 1,000 nm, said at least one surface resistance layer having a substantially uniform and constant surface resistance distribution, thereby obtaining a web of a surface resistance sheet material;
- c) forming a plurality of surface resistance sections form said web of surface resistance sheet material;
- d) arranging a plurality of two-dimensional surface resistance sections in a mutually spaced and substantially parallel relationship.
Dependencies are inferred from the claim text.