An Automatic Microwave Dielectrometer (Correspondence)

The dielectric constant of low-loss dielectric materials can be measured accurately, rapidly, and automatically by proper utilization of an automatic microwave impedance instrument of the type which presents its output in Smith Chart form; i.e., the magnitude and phase of the reflection coefficient. The method employed is essentially a modification of the slotted line technique which was originally described by Roberts and Von Hippel, the difference being that the slotted line is replaced by an automatic impedance instrument with a direct reading scale.