DPS10-02 Frequency Change Method Measurement System
This system measures permittivity and dielectric loss tangent in free space, eliminating a need for an anechoic chamber, suitable for measuring samples that cannot be cut or those of thick materials.
Its measurement method was newly developed, because conventional free space measurement S-parameter method does not gives enough accuracy.
Compared with S-parameter method, the system is characteristic in that it's easy just to perform zero calibration to measure, and its measurement accuracy is high enough to measure PTFE.
This system employs a deduction method in the measurement on the principle that the frequency characteristics of the transmission attenuation of radio wave radiated onto a plate is dependent on εr'.
Unlike coaxial tube or waveguide type, which uses samples housed in the fixture, it does not introduce errors resulting from air gaps.
In addition, because a lens is attached to the antenna, it is compact yet can measure samples with a plane wave, resulting in a high measurement accuracy.
Moreover, because measurement samples are placed near the antenna, sample size can be small.