A coaxial-circular waveguide for dielectric measurement

A two-port cell for the dielectric measurement of a variety of materials is described. The cell is a symmetric cylindrical sample holder connected to a coaxial line at each end. The cell has some important differences from the traditional two-port coaxial cell that is commonly used. In the proposed design, the sample is in the shape of a solid circular disk with no hole in its center. This represents a simplicity in sample matching over the coaxial cell that is important, especially in the case of soft rocks. Other advantages of the proposed design over the coaxial cell design are the larger dynamic range and higher sensitivity. A full-wave model that can predict the response of the cell is developed