Dielectric Measurement
Dielectric properties for high-frequency designs are produced by measurement procedures that use a resonant structure to determine permittivity and loss tangent. A strip line cavity test involves placing a sample of the dielectric between two ground planes to create a shielded environment. By measuring the resonant frequency and the quality factor of the cavity, the instrument calculates the electrical properties of the material.
This method avoids the errors associated with open structures and radiation losses.
Frequency Range
Broad spectrum coverage of the microwave and millimeter-wave bands is provided by the Frequency Range of a strip line cavity test. Fabricators use this data to verify that the raw laminate meets the tight specifications required for antenna arrays. Unlike lower frequency methods, the cavity resonator captures the behavior of the material at its actual operating frequency.
These results are used to calibrate the design software and improve the accuracy of impedance models.
Dissipation Constant
Signal energy conversion into heat within the substrate is quantified by the Dissipation Constant of a strip line cavity test. Low-loss materials are essential for maintaining signal strength. Designers select materials based on these results to ensure that the final product meets the required power budget.
