A modified resonant cavity method was developed to evaluate the microwave dielectric properties of giant permittivity materials, which were difficult to determine accurately using previous methods. A small-sized sample was used for measurement in the present work, and the microwave dielectric properties could be measured accurately over a wide frequency range with the aid of low-loss reference ceramics. The measurement was conducted on CaCu_3Ti_4O_(12) ceramics from 3.38 to 10.16 GHz. The permittivity of CaCu_3Ti_4O_(12) ceramics was around 84 over the above frequency range and decreased slightly with increasing frequency, while the dielectric loss decreased significantly from 0.17 to 0.055.
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