Abstract
A group carrier supply ceramic filter for use in an FDM carrier system was examined. For the filter, a ladder filter configuration composed of nine wire-mounted ceramic disk resonators and eight multilayer ceramic capacitors was adopted. Because of refinement of the filter design, only rough adjustment was fully sufficient for the frequency adjustment on the resonator. The filter exhibited analogous characteristics designed according to image parameter theory; both its temperature and aging characteristics were satisfactory. The stopband attenuation was more than 100 dB, due to suppression of spurious vibration. The filter size was reduced to 1/2 that of the usual quartz crystal filter.
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