In this paper, two broadband measurement methods, shorted microstrip method and microstrip trnasmission method, are discussed, and the complex permeability of ferromagnetic thin films is measured from 100MHz to 18GHz. The S-parameters of the two measurement fixtures are measured by vector network analyzer (VNA). The perturbations of the thin film loaded in the measurement fixture are analyzed; the discontinuity between coaxial and microstrip is considered; the effective permeability is deduced from measured S-parameters; the permeability of ferromagnetic thin films is extracted from effective permeability by using conformal mapping. The results show that the experimental results agree with the theoretical ones closely, and higher measurement sensitivity and accuracy are achieved by using shorted microstrip method.
2. Adenot, A.-L., O. Acher, D. Pain, F. Duverger, M.-J. Malliavin, D. Damiani, and T. Taffary, "Broadband permeability measurement of ferromagnetic thin films or microwires by a coaxial line perturbation method," J. Appl. Phys., Vol. 87, No. 9, 5965-5967, 2000.
doi:10.1063/1.372581
3. Wu, Y., Z. Tang, Y. 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, No. 2-3, 343-352, 2008.
doi:10.1163/156939308784160811
4. Kumar, A. V. P., V. Hamsakutty, J. Yohannan, and K. T. Mathew, "Microstripline FED cylindrical dielectric resonator antenna with a coplanar parasitic IC strip," Progress In Electromagnetics Research, Vol. 60, 143-152, 2006.
doi:10.2528/PIER05121301
5. Saed, M. A., "Reconfigurable broadband microstrip antenna FED by a coplanar waveguide," Progress In Electromagnetics Research, Vol. 55, 227-239, 2005.
doi:10.2528/PIER05031601
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 Scientific Instruments, Vol. 76, 063911.1-063911.8, 2005.
7. Svacina, J., "A simple quasi-static determination of basic parameters of multilayer microstrip and coplanar waveguide," IEEE Microwave and Guided Wave Letters, Vol. 2, No. 10, October 1992.
8. Pucel, R. A. and D. J. Masse, "Microstrip propagation on magnetic substrates-Part I: Design theory," IEEE Trans. MTT, Vol. 20, No. 5, 304-308, May 1972.
doi:10.1109/TMTT.1972.1127749
9. Huijbregtse, J., F. Roozeboom, J. Sietsma, J. Donkers, T. Kuiper, and E. van de Riet, "High-frequency permeability of soft-magnetic Fe-Hf-O films with high resistivity," J. Appl. Phys., Vol. 83, No. 3, 1569-1574, February 1998.
doi:10.1063/1.366867
Submit
