The Characteristic Analysis of Micro Stripe Bandpass Filter By Magnetic Material

• Main Authors: Kuei Hung Lin, 林貴弘
• Other Authors: W. S. Feng
• Format: Others
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/13468689678822360886

碩士 === 長庚大學 === 電子工程學系 === 100 === This thesis focuses on 2.4GHz 2-port filter , and mainly focus on the effects of magnetic materials to filter frequency, bandwidth, and mid-frequency. In this thesis, the characteristics of magnetic materials, filters and Microstrip Line first are discussed. A Microstrip Line filter is further designed and implemented by simulation tools. The designed filter is fabricated on a 25 mm 20 mm FR4 substrate, and soft magnetic materials are respectively disposed on the bottom of the substrate and on the circuit board. After measuring frequency, bandwidth, and mid-frequency of filter, the comparison and the analysis are carried out. Lastly, the effects of magnetic materials to filter frequency, bandwidth, and mid-frequency are discussed in this thesis. In summary, magnetic materials with different thicknesses are respectively disposed on micro stripe. The measurement results presents that the mid-frequency of the component increases with the decrease of the thickness of the magnetic materials, and vice versa. In addition, it is found that a shift to low frequency becomes more obvious with the increase of the thickness of the magnetic materials.