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Shielding cover used on dielectric filter and dielectric filter having shielding cover

A shielding cover and filter technology, applied in the fields of magnetic field/electric field shielding, waveguide type devices, circuits, etc., can solve problems such as increasing manufacturing costs, and achieve the effect of avoiding fluctuations

Inactive Publication Date: 2004-10-06
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this technique, an additional process for forming the groove is required, thereby increasing the manufacturing cost

Method used

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  • Shielding cover used on dielectric filter and dielectric filter having shielding cover
  • Shielding cover used on dielectric filter and dielectric filter having shielding cover
  • Shielding cover used on dielectric filter and dielectric filter having shielding cover

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Embodiment Construction

[0075] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0076] As shown in FIG. 3( a), the shielding case 10 has a first sheet 11, second and third sheets 12 and 13 bent to be substantially perpendicular to the first sheet 11, and formed on the first sheet 11 and on the first sheet 11. Raised portion 14 of the edge. The shield 10 can be made by bending a sheet metal. As shown in FIG. 3(b), it is preferable that the inner portion 15 and the outer portion 16 of the curved portions of the first and second sheets 41 and 42 and the second and third sheets 41 and 42 have slightly expanded shapes.

[0077] Dielectric filter 20 is a bandpass filter, and is made of ceramic material (ε r =92) is composed of a substantially rectangular prism-shaped dielectric block 21, wherein the main component of the ceramic material is barium titanate. The dielectric block 21 has a top surface 22 , a bottom surface 23 , side surface...

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PUM

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Abstract

A shield that can prevent the thickness of a dielectric filter from increasing without increasing the manufacturing cost of the dielectric filter is disclosed. The shield 10 of the present invention is to be attached to a dielectric filter 20 and has a first plate 11, a second plate 12 elongated from the first end of the first plate 11 in a predetermined direction, a third plate 13 elongated from the second end of the first plate 11 opposite to the first end in the predetermined direction, and a projecting part 14 projecting from the first plate 11 at a portion between the first and second ends of the first plate 11. Since the shield 10 can be fixed to the dielectric filter 20 by pinching the both side of the dielectric block 20 and the projecting part 14 can be in contact with the metallization 30-2 of the dielectric filter 20, the total thickness of the dielectric filter 20 does not increase even the shield 10 is attached.

Description

technical field [0001] The present invention relates to a shield and a dielectric filter, in particular to a shield capable of preventing an increase in the thickness of the dielectric filter without increasing the manufacturing cost of the dielectric filter, and a dielectric filter having the same. Background technique [0002] Generally, a dielectric block having a through hole from one surface through the opposite surface and all surfaces except the one surface being metallized is used for the dielectric filter. The via holes formed on the dielectric block serve as resonators for high frequency signals. A filter circuit such as a band-pass filter circuit is formed by adding capacitance or the like to the resonator. [0003] When the dielectric filter is mounted on a printed circuit board, the metal formed on the surface of the dielectric block is grounded. However, since the metallization (top metallization) formed on the upper surface of the dielectric block is far awa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00H01P1/20H01P1/205
CPCH01P1/2056H01P1/20
Inventor 远藤谦二田久保修
Owner TDK CORPARATION