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The increasing use of precision printed wiring circuits at very high and microwave frequencies has created a growing need for insulating materials having isotropic dielectric constant and dissipation factor since the electric field of printed wiring boards is active in both the perpendicular and parallel directions. It is recognized that the dielectric properties of laminated sheet insulating materials...
The inherent high accuracy of the (1) liquid displacement test method for determining the dielectric constant of sheet insulating meterials is well established. However, there is a growing need to extend this method to a frequency range above the present maximum of 1 megacycle.
Clear ruby muscovite mica is classified as a low loss insulating material and many values for dielectric loss and dielectric constant are given in the literature. Such values presumably are based on measurements made in the direction perpendicular to the plane of basal cleavage. We find that mica inherently has a much higher dielectric loss parallel to the plane of cleavage and that impurities such...
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