Band-pass filter

A technology of band-pass filter and resonator, applied in the direction of waveguide type device, waveguide, resonator, etc., can solve the problem of unrealistic and achieve the effect of suppressing inconsistency

Active Publication Date: 2019-11-22
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is impractical to insert a thin conductor bar into a thin substrate like thi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 〕

[0026] (Structure of bandpass filter 1)

[0027] refer to figure 1 and figure 2 A bandpass filter (BPF, BandPassFilter) according to the first embodiment of the present invention will be described. figure 1 It is a perspective view of BPF1 concerning this embodiment. figure 2 It is a perspective view of the conversion part 31 with which BPF1 is equipped.

[0028] Such as figure 1 As shown, BPF 1 includes substrate 2 made of a dielectric material, conductive layer 3 and conductive layer 4 as a pair of conductive layers, and column wall 11 and column wall 12 .

[0029] The substrate 2 is a plate-like member made of a dielectric. Hereinafter, among the six surfaces constituting the substrate 2 , the two surfaces with the largest areas are referred to as main surfaces of the substrate 2 . In this embodiment, quartz is used as the dielectric material constituting the substrate 2 , but other dielectric materials (for example, resins such as Teflon (registered trademark) resi...

no. 2 approach 〕

[0074] refer to image 3 A method of manufacturing the bandpass filter according to the second embodiment of the present invention will be described. image 3 It is a flowchart of the manufacturing method of the bandpass filter which concerns on this embodiment. This manufacturing method mainly involves figure 1 The step of forming the recesses 221 , 231 , and 241 and the step of forming a conductor film on the inner walls of the recesses 221 , 231 , and 241 in the manufacturing method of the BPF 1 shown are shown.

[0075] (Manufacturing method of BPF1)

[0076] Such as image 3 As shown, this manufacturing method includes the forming step S11 of the through-hole and the concave portion, the determining step S12, and the forming step S13 of the conductor film.

[0077] The forming step S11 of through-holes and recesses is a step of forming (1) a plurality of through-holes for forming conductor posts 11i, 12i, 26j, 27j, 28j, and 29j on the substrate 2 based on a predetermi...

no. 3 approach 〕

[0088] refer to Figure 4 BPF 101 according to the third embodiment of the present invention will be described. Figure 4 It is a perspective view of BPF101. In addition, in Figure 4 In order to easily observe the structure of the four recesses (recesses 1221-1224, 1231-1234, 1241-1244) formed in each resonator 122-124, each column wall 111, 112 and each partition wall 126 constituting each resonator Numerals to 129 are schematically shown not as columnar waveguides using columnar walls but as rectangular waveguides using imaginary planar walls. In addition, each column wall 111,112 and each partition wall 126-129 are not shown as the wall which has thickness, but are shown by the imaginary surface.

[0089] BPF101 by targeting figure 1 The BPF1 shown is obtained by adding another concave portion. In this embodiment, after clarifying the correspondence relationship between BPF101 and BPF1, the difference between BPF101 and BPF1 will be mainly described.

[0090] BPF 101...

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Abstract

The purpose of the present invention is to suppress an error between a central frequency and a target central frequency in a resonator coupling-type band-pass filter in which a post-wall waveguide isutilized. The band-pass filter (1) is provided with a dielectric substrate (2) sandwiched between a pair of conductor layers (3, 4), and post-walls (11, 12) comprising a plurality of conductor posts (11i, 12i) penetrating through the substrate (2) and short-circuiting the conductor layers (3, 4), wherein a plurality of resonators (22 to 24) comprising the conductor layers (3, 4) as a pair of widewalls and the post-walls (11, 12) as narrow walls are coupled. At least one of the resonators (22 to 24) is formed with a recess (221 to 241) penetrating through one of the wide walls (conductor layer4) and reaching the inside of the substrate (2).

Description

technical field [0001] The present invention relates to a bandpass filter that limits the passband of radio waves. Background technique [0002] In a bandpass filter (BPF, BandpassFilter) that limits the passband of a signal propagating in a metal waveguide, the technology for adjusting the center frequency of the passband is described in Patent Document 1. figure 1 and figure 2 middle. of Patent Document 1 figure 1 and figure 2 The described BPF is a resonator-coupled BPF to which three-stage resonators are coupled. [0003] The same number of conductor insertion holes as the number of configuration stages are formed on the side surface of the waveguide of the BPF. The conductor insertion hole is provided for inserting the conductor rod from the outside of the waveguide toward the inside. This BPF can adjust the center frequency by adjusting the amount of protrusion of the conductor rod into the waveguide. [0004] The BPF of Patent Document 1 uses a metal waveguid...

Claims

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Application Information

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IPC IPC(8): H01P1/208H01P3/12H01P11/00
CPCH01P1/2088H01P11/002H01P1/2002H01P1/207H01P3/121H01P7/06H01P7/065
Inventor 上道雄介
Owner THE FUJIKURA CABLE WORKS LTD
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