Abstract: A linearly polarized eddy current sensor including a source antenna and a parasitic antenna coupled to the source antenna, serves as a high sensitivity tool for the measurement of the surface impedance of sheet goods without requiring contact with the sample. Sheet goods can have an anisotropic, frequency-dependent surface impedance that is sensitive to minor changes in configuration of the sample. Because the electric field induced by the sensor is linearly polarized, measurement of directionally dependent sheet impedance can be achieved. The measurement is performed with the resonant device operating in resonance mode whereby the immediate proximity of the material to be measured causes damping and shifting of the coupled loop resonance. The resonant frequency of the sensor can be tuned by making changes to its geometry.

Abstract: A waveguide including: a first section including a first surface, a second surface, an upper wall, and a lower wall facing the upper wall; and a second section extending from the second surface; wherein the first section includes an upper ridge on the upper wall of the first section and a lower ridge on the lower wall of the first section, wherein the second section includes an upper conductor extending from a top portion of the second surface and a lower conductor extending from a lower portion of the second surface with a gap between the upper and lower conductors, wherein the upper conductor is electrically connected to the upper ridge, wherein the lower conductor is electrically connected to the lower ridge, and wherein the upper and lower conductors are adapted to propagate a wave and reduce discontinuity of the wave a connection between the first and second sections.

Abstract: A linearly polarized eddy current sensor including a source antenna and a parasitic antenna coupled to the source antenna, serves as a high sensitivity tool for the measurement of the surface impedance of sheet goods without requiring contact with the sample. Sheet goods can have an anisotropic, frequency-dependent surface impedance that is sensitive to minor changes in configuration of the sample. Because the electric field induced by the sensor is linearly polarized, measurement of directionally dependent sheet impedance can be achieved. The measurement is performed with the resonant device operating in resonance mode whereby the immediate proximity of the material to be measured causes damping and shifting of the coupled loop resonance. The resonant frequency of the sensor can be tuned by making changes to its geometry.

Abstract: A waveguide including: a first section including a first surface, a second surface, an upper wall, and a lower wall facing the upper wall; and a second section extending from the second surface; wherein the first section includes an upper ridge on the upper wall of the first section and a lower ridge on the lower wall of the first section, wherein the second section includes an upper conductor extending from a top portion of the second surface and a lower conductor extending from a lower portion of the second surface with a gap between the upper and lower conductors, wherein the upper conductor is electrically connected to the upper ridge, wherein the lower conductor is electrically connected to the lower ridge, and wherein the upper and lower conductors are adapted to propagate a wave and reduce discontinuity of the wave a connection between the first and second sections.

Abstract: A conductive woven material (2) being conductive, and preferably equally conductive, in all directions is made using woven fabric (4) having conductive weft fibers (10). The material is produced by cutting the woven fabric at a first, acute angle (19) to the side edges (12, 14) to produce trapezoidally-shaped cut fabric pieces (18). The cut fabric pieces are then reoriented so that the former side edges of the fabric are placed to abut one another to create a reconstructed fabric (20) in which the weft fibers are at acute angle (22) to the length of the reconstructed fabric. Two layers of reconstructed fabric (24, 26) are placed one upon the other, with one upside down, so that the conductive weft fibers are at an angle, preferably 90.degree., to one another so to create the conductive woven material. The conductive woven material can be used to form, for example, conductive laminates or conductive honeycomb material.