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A maximal-flat-type bandpass filter using two TM/sub 01 delta /-mode dielectric resonators oriented axially in a high-T/sub c/ superconductor cylinder was designed with 3-dB bandwidth of 36 MHz at 11.958 GHz. For this filter an insertion loss below 0.1 dB and a frequency temperature coefficient of -2.7 ppm/K were realized in the range of 20 to 50 K. >

Coplanar two-port transmission line resonators were made using high-T/sub c/ superconducting EuBa/sub 2/Cu/sub 3/O/sub x/ film on an MgO substrate. The EuBa/sub 2/Cu/sub 3/O/sub x/ films were prepared by magnetron sputtering and patterned by photolithography and Ar ion milling. The resonator characteristics were measured as a junction of temperature and power. The highest unloaded Q value obtained was 12500 at 28 K and at 3.9 GHz, and the surface resistance of the film was estimated at about 40 mu Omega . No change in Q values was observed at input power level less than -20 dBm. >

A new method is proposed to evaluate the quality of pellet component. Unlike other methods which only rely on the binarized image to solve this problem, ours rely on both the binarized image for measuring and other features of the image. In this paper, first of all, a model is constructed. The size of the model depends on the designed requirement of dimension and its allowable tolerance. By using this model, the sizes of the component are inspected roughly. Then, we propose the backpropagation (BP) neural networks for evaluating the ring of central part based on the features of the tested component. Because there are measurement errors such as systematic and random errors, so the dimension of the component has to be measured several times. Finally, the final decision method is proposed. This method can evaluate the quality of pellet component more precisely than the traditional methods.