Measuring complex permeability of ferromagnetic thin films using non-50 Ω shorted microstrip method

A non-50 Ω shorted microstrip method is proposed to measure the complex permeability of ferromagnetic thin film. The proposed method, using a higher characteristic impedance microstrip, achieves a more compact fixture structure and can be applied to a higher operation frequency. The experimental results show that, assuming the discontinuity effect between the coaxial-microstrip connector and the microstrip, the permeability measured using the non-50 Ω shorted microstrip method agrees excellently with that measured using the 50 Ω shorted microstrip method.