Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8154188 | Journal of Magnetism and Magnetic Materials | 2018 | 22 Pages |
Abstract
High-frequency permeability spectra of magnetic films were measured over a wideband frequency range of 0.1-30â¯GHz using a shielded and short-circuited microstrip line jig. In this measurement, spurious resonances had to be suppressed up to the highest frequency. To suppress these resonances, characteristic impedance of the microstrip line should approach 50â¯Î© at the junction between connector and microstrip line. The main factors dominating these resonances were structures of the jig and the sample. The dimensions were optimized in various experiments, and results demonstrated that the frequency could be raised to at least 20â¯GHz. For the transverse electromagnetic mode to transmit stably along the microstrip line, the preferred sample was rectangular, with the shorter side parallel to the line and the longer side perpendicular to it, and characteristic impedance strongly depended on the signal line width of the jig. However, too small a jig and sample led to a lower S/N ratio.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Shigeru Takeda, Masayuki Naoe,