Characterization of an experimental ferrite LTCC tape system for microwave and millimeter-wave applications

J. Bray, Kari Kautio, L. Roy

    Research output: Contribution to journalArticleScientificpeer-review

    22 Citations (Scopus)


    An experimental-low temperature cofired ceramic (LTCC) ferrite tape system is characterized using circuits that are fabricated from the very material under test. Such in situ circuits provide data that are thought to be more representative of the performance obtainable by more complicated circuitry that will eventually be made from the same material using the same fabrication method. Emphasis is placed on simple measurements that can be performed using a minimum amount of equipment. For the first time, a compact in situ LTCC solenoid transformer is used to measure the magnetostatic properties of the ferrite, yielding a measured saturation flux density of 230 mT, a remanence of 136 mT, and a coercivity of 688 A/m. The peak linear relative permeability of the ferrite is 97 and its Curie temperature is low, only 117/spl deg/C. A novel two-port line-connected ring resonator is used to characterize the material in the 6-40 GHz range. At frequencies above 20 GHz, the relative permittivity of the ferrite is 11.0, whereas its loss tangent ranges from 0.002 to 0.004, demonstrating the ferrite's suitability for use in microwave and millimeter-wave circuitry.
    Original languageEnglish
    Pages (from-to)558 - 565
    Number of pages8
    JournalIEEE Transactions on Advanced Packaging
    Issue number3
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed


    • Curie temperature
    • ceramic packaging
    • coercive force
    • ferrites
    • loss measurement
    • magnetic hysteresis
    • microwave circuits
    • microwave measurement
    • microwave phase shifters
    • millimetre wave circuits
    • permittivity measurement
    • remanence
    • resonators
    • solenoids
    • packaging
    • microwave resonators


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