In this paper, high glass transition temperature (Tg) of polyetherimide (PEI) is used to mix with different weight percent (080wt%) of BaTi4O9 (BT4) ceramic powder to form a flexible PEI/BT4 composite. The relative permittivity of PEI/BT4 composites is developed from 1to16GHz using the “rectangular cavity resonator” method. The relative permittivity of PEI/BT4 composites is calculated by observing the frequencies of resonant cavity modes. From the results of dielectric properties, the relative permittivity of PEI/BT4 composites is almost unchanged as the measured frequency is changed. It conjectures that the polarization mode does not exist in BT4 ceramic powder.

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