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Improvement of HTS Filter Properties Using the Ceramic Rod Trimmer

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This paper shows results of ceramic rod trimming to improve the HTS filter properties. First, we examined the optimum position of ceramic rod against the hairpin filter to shift the resonance frequency. The resonance frequency could be changed about 20 MHz, which values is enough to use filter trimming. Next, we examined ceramic rod trimming of the 5-resonator hairpin type filter. We found that ceramic rod trimming was quite useful to improve the filter properties, for example, reduce the ripple and increase the sharpness of the skirt properties and so on.

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