| 摘要 |
PURPOSE:To reduce the area of a space where a dielectric composite filter is provided, by putting a coaxial resonant filter constituting the 2nd filter in a through hole constituting the resonant element of the 1st filter. CONSTITUTION:The 1st filter 1 on the outside is constituted in such a way that a through hole 3 is provided in a dielectric block 4 and the circumferential surface of the block 4 is covered with an outer conductor 6. The inner surface of the hole 3 is covered with an inner conductor 5. The dielectric block 4 at the top end of the through hole 3 is covered with a conductor layer and forms a short-circuiting surface 7, where the inner and outer conductors 5 and 6 are short-circuited with each other. At the bottom end of the hole 3 the dielectric body is exposed and an opened surface 8, where the inner and outer conductors 5 and 6 are separated from each other, is formed. The 2nd filter 2 at the inside is constituted in such a way that a through hole 10 is provided in a dielectric block 9 and the circumferential and inner surfaces are respectively covered with an outer and inner conductors 12 and 11. In addition, an opened surface 14 is formed at the top end of the through hole 10 and a short-circuiting surface 13 is formed at the bottom end.
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