Complex relative permeability and permittivity were evaluated simultaneously in the band of 100 MHz-67 GHz using a flexible microstrip line-type probe. In principle, the probe can evaluate the permeability and permittivity of electromagnetic materials regardless of size. The measured permeability and permittivity were obtained from the transmission coefficient ( S_21 ). Since S_21 under the infinite magnetic field can be estimated by changing the dc magnetic field stepwise, the magnetic and dielectric signals were separated accurately. The complex permeability and permittivity of a NiZn ferrite sheet (10 mm ×10 mm, 0.1 mm thick) and polytetrafluoroethylene (PTFE) (25 mm ×25 mm, 0.79 mm thick) were evaluated accurately.
- Complex relative permeability measurement
- microstrip line-type probe
- permittivity measurement
- sample size limitation