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Band-pass filter

A technology of band-pass filter and dielectric resonator, which is used in waveguide-type devices, resonators, electrical components, etc.

Inactive Publication Date: 2003-03-12
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the miniaturization of filter components must be limited to ensure the mechanical strength of these parts
[0006] Therefore, in the prior art, it is difficult to ensure sufficient mechanical strength while miniaturizing the filter components

Method used

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Examples

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Embodiment Construction

[0099] Preferred embodiments of the present invention will now be explained with reference to the accompanying drawings.

[0100] As shown in FIGS. 1 and 2 , a bandpass filter 1 as a preferred embodiment of the present invention includes a dielectric member 2 and various metal plates formed on the surface of the dielectric member 2 . The dielectric component 2 is determined by the dielectric constant ε r For example, it is made of 37 dielectric materials and has the shape of a rectangular prism, wherein the length, width and thickness of the rectangular prism are 6.7mm, 2.0mm and 1.0mm. That is, the dielectric member 2 has no pores or surface irregularities.

[0101]Furthermore, the dielectric member 2 includes: a first portion located between the first cross section and a second cross section parallel to the first cross section; and second and third portions divided by the first portion. It should be noted that this does not mean that the dielectric member 2 is a union of t...

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PUM

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Abstract

A highly compact bandpass filter that has excellent mechanical strength is disclosed. A bandpass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator. The metal plates include an inductive stub formed on the surface of the first portion of the dielectric block.

Description

technical field [0001] The present invention relates to a bandpass filter, and in particular to a highly compact bandpass filter with excellent mechanical strength. Background technique [0002] In recent years, communication terminals, particularly mobile phones, have been remarkably miniaturized due to the miniaturization of various components contained therein. In a communication terminal, one of the most important components is the bandpass filter. [0003] As a filter component, for example, Japanese Patent Laid-Open No. 2000-68711 and Japanese Patent Laid-Open No. 2000-183616 describe a bandpass filter including a dielectric member formed with a plurality of holes, the holes The inner walls are covered with metal plates. For another filter component, in "New Dielectric Waveguide Components - Microwave Applications of New Ceramic Materials (PROCEEDINGS OF THE IEEE, Vol. 79, No. 6, June 1991), p. 734, Figure 31 "A bandpass filter constructed by forming a metal plate o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P1/201H01P1/205H01P7/08
CPCH01P1/201
Inventor 薰树亚栏
Owner TDK CORPARATION