| 摘要 |
PURPOSE:To improve the propagating characteristic of a dielectric filter by forming a slit opposite to an adjacent dielectric resonator and inserting a common substrate formed with a resistive film to the slit so as to attenuate the spurious resonance mode of the electric field component in parallel with the resistive film. CONSTITUTION:A case 7 and a cover 8 made of a metal such as copper are formed with slots 71, 81 to which the common substrate 6 is inserted respectively, and plural dielectric resonators 5 made of a dielectric material such as balium titanate are fixed to the case 7 by a support 51 while opposite slits 52 are formed in radial direction of the adjacent resonators 5 vertically to the electric field. The common substrate 6 formed with the resistive film 61 split into two at a center line in parallel with the resonators 5 made of a metallic film to the surface is inserted to the slit 52 of the adjacently arranged dielectric resonators 5, the lower end of the common substrate 6 is fitted to the slot 71 of the case 7 and the upper end is fitted to the slot 81 of the cover 8. |
