| Title |
Measurement of Complex Permittivity and Permeability for Powder-type Materials |
| Authors |
박상복(Park, Sang-Bok) ; 이장수(Lee, Jang-Soo) ; 정용식(Chong, Young-Seek) ; 천창율(Cheon, Chang-Yul) |
| Keywords |
Permittivity ; Permeability ; Coaxial Cable ; Transmission Line ; Magnetic Powder |
| Abstract |
Materials used at microwave are usually used as a dielectric with a manufacturing purpose of printed circuit boards, etc. Complex permittivity of them can be measured from attenuation constant or propagation constant of a transmission line using a microstrip line with bulk type. But as the technique recently which can manufacture to have complex permittivity and permeability demanded using nonferrous metals for powder-type grows up, we need sensors and methods which can measure characteristics of powder-type materials. So far measuring methods of permittivity and permeability with waveguide or coaxial cable are used but they have faults which have a complex measurement method and are difficult to simultaneously measure permittivity and permeability. In this paper, a simultaneous measuring method of permittivity and permeability with 2-port coaxial cable and a new proposed calculation. The proposed 2-port coaxial cable is designed to be easy to insert materials and to have a wideband. We measure permittivity and permeability of magnetic powder(Ni-Fe-Mo, Ni-Fe) which reveal its characteristic at 0.3~1.3GHz to identify the proposed sensor. |