Browsing by Author "RAFIA RAEES"

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    Study of Rare Earth Doped Ferrites and Their Characterization in High Frequency Region
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2019) RAFIA RAEES; CIIT/FA17-RPH-029/LHR; LHR TP 5723; Dr. Amna Mir
    Characterization of a material at high frequency is done by the use of a transmission line (coaxial) and Vector Network Analyzer (VNA). VNA measures the S-parameters that includes xture e⁄ects. Theoretical derivation of S-paramters was done by solv- ing electric eld equations subject to boundry conditions. It is clear from obtained relations that extra phase factors are included due to coaxial cells in the measurement setup. These extra phase terms are removed by using de-embedding technique. Math- ematica software was used to carry out the mathemetical steps. After de-embedding, S-parameters of material under test are obtained. These material parameters were then solved using NRW method which is used to extract complex electromagnetic properties of prepared Strontium ferrite substituted with a rare earth material. M-type Strontium ferrite with a structural formula Srx