| 摘要 |
PURPOSE:To improve the frequency attenuation characteristic by using a filter whose lower frequency curve is tilted more than that of the high frequency curve for the 1st band-pass dielectric filter and a filter whose high frequency curve is tilted more than that of the low frequency as the 2nd band-pass dielectric filter. CONSTITUTION:The titled antenna multicoupler uses tow band-pass dielectric filters BPFs in combination; the 1st BPF having the attenuation characteristic where the slope of the curve of low frequency is larger than that of high frequency as shown in curve A and the 2nd BPF having the attenuation characteristic where the slope of the curve of high frequency is larger than that of low frequency as shown in curve B. In the BPFs, plural through holes 21, 22 are formed to a dielectric ceramic block 1 with an interval, one face 11 with the through holes opened is used as an open end face, the bottom, side face and inner faces of the through holes except the open end face 11 are subjected to metallized processing to form conductive films 31, 32 and 33 in electric continuity as short-circuit faces for the dielectric resonator.
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