Low density dielectric having low microwave loss
First Claim
1. A composite material comprising:
- a matrix material comprising a microwave transmissive polymer; and
from about 1 to 65 volume percent of a particulate filler dispersed in the matrix, the particulate filler being characterized by;
an electrically conductive coating 5 to 500 nanometers thick on the filler particles, particles which are spheroids having a particle size in the range of 10-350 μ
m and a density below 3.5 g/cc, the combination of particle size and coating thickness being sufficient to yield a composite material dielectric constant from 1.2 to 100, and a composite material microwave loss tangent no greater than 0.10 at 1 GHz.
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Accused Products
Abstract
Disclosed is a composite material comprising a matrix material comprising a microwave transmissive polymer; and from about 1 to 65 volume percent of a particulate filler dispersed in the matrix. This particulate filler is characterized by an electrically conductive coating on the filler particles, particles selected from spheroids and ellipsoids having a major dimension below about 0.5 mm and particles having an aspect ratio greater than about 2 to 1 having a minor dimension below 100 μm, and a combination of particle size and coating thickness sufficient to yield a combination of a composite material dielectric constant between about 1.2 to 100, and a composite material microwave loss tangent no greater than about 0.10 at 1 GHz.
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Citations
18 Claims
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1. A composite material comprising:
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a matrix material comprising a microwave transmissive polymer; and
from about 1 to 65 volume percent of a particulate filler dispersed in the matrix, the particulate filler being characterized by;
an electrically conductive coating 5 to 500 nanometers thick on the filler particles, particles which are spheroids having a particle size in the range of 10-350 μ
m and a density below 3.5 g/cc, the combination of particle size and coating thickness being sufficient to yield a composite material dielectric constant from 1.2 to 100, and a composite material microwave loss tangent no greater than 0.10 at 1 GHz.- View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
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8. A composite material comprising:
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a matrix material comprising a microwave transmissive polymer; and
from about 1 to 65 volume percent of a filler comprising microspheres dispersed in the matrix, the filler microspheres being characterized by;
a metal coating 5 to 500 nanometers thick and selected from the group consisting of aluminum, stainless steel, titanium, and tungsten, an average particle size in the range of 10 to 350 μ
m,a density below 3.5 g/cc, the combination of particle size and coating thickness being sufficient to yield of a composite material dielectric constant from 1.2 to 100, and a composite material microwave loss tangent no greater than 0.10 at 1 GHz. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17, 18)
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Specification