The complex permeability of ferromagnetic thin films is measured up to 10 GHz by using shorted microstrip method combining with conformal mapping. The S-parameters are measured by vector network analyzer (VNA), and the effect of thin film placed both upwards and downwards in the fixture are investigated. The experimental results show that the complex permeability of the thin films is measured accurately from 500 MHz to 10 GHz, and loading the samples with thin film placed downwards can avoid the electromagnetic resonance effectively.
2. Wu, Y. Q., Z. X. Tang, B. Zhang, and Y. H. Xu, "Permeability measurement of ferromagnetic materials in microwave frequency range using support vector machine regression," Progress In Electromagnetics Research, Vol. 70, 247-256, 2007.
3. Yiddish, C., K. Gooney, M. Turkmen, and S. Kayak, "Neural models for coplanar strip line synthesis," Progress In Electromagnetics Research, Vol. 69, 127-144, 2007.
4. Kumar, A. V. P., V. Hamsakutty, J. Yohannan, and K. T. Mathew, "Microstripline FED cylindrical dielectric resonator antenna with a coplanar parasitic strip," Progress In Electromagnetics Research, Vol. 60, 143-152, 2006.
5. Saed, M. A., "Reconfigurable broadband microstrip antenna FED by a coplanar waveguide," Progress In Electromagnetics Research, Vol. 55, 227-239, 2005.
6. Liu, Y., L. Chen, C. Y. Tan, H. J. Liu, and C. K. Ong, "Broadband complex permeability characterization of magnetic thin films using shorted microstrip transmission-line perturbation," Review of Scicentific Instruments, Vol. 76, 063911.1-063911.8, 2005.
7. Wu, Y. Q., Z. X. Tang, Y. H. Xu, and B. Zhang, "An improved measurement configuration for determining the permeability of ferromagnetic thin film materials," Journal of Electromagnetic Waves and Applications, Vol. 22, 343-352, 2008.
8. Wu, Y. Q., Z. X. Tang, Y. H. Xu, B. Zhang, and X. He, "An improved method for permeability measurement of magnetic thin film," Journal of Electromagnetic Waves and Applications, Vol. 22, 1173-1179, 2008.
9. Svacina, J., "A simple quasi-static determination of basic parameters of multilayer microstrip and coplanar waveguide," IEEE Microwave and Guided Wave Letters, Vol. 2, 385-387, 1992.
10. Pucel, R. A. and D. J. Massé, "Microstrip propagation on magnetic substrates --- Part I: Design theory," IEEE Trans. Microwave Theory Tech., Vol. 20, 304-308, 1972.