CN108736111B - filter - Google Patents

Abstract

Translated fromChinese

一种滤波器，设置于基板上，这种滤波器包括第一部，第二部，接地部，第一耦合部及第二耦合部。其中，第一部设置于所述基板的第一层，用于馈入信号；第二部设置于所述第一层，用于输出所述信号；接地部设置于所述基板的第二层；第一耦合部设置于所述第一层，所述第一耦合部与所述第一部和所述第二部电性连接，所述第一耦合部通过贯孔与所述接地部连接；第二耦合部设置于所述第一层，所述第二耦合部与所述第一部和所述第二部电性连接，所述第二耦合部通过所述贯孔与所述接地部连接。本发明提供的滤波器，体积非常小，在有限的空间内展现了强大的滤波效能，既减小了频段内的噪声干扰，也有利于实现轻薄短小的产品设计。

A filter is arranged on a substrate. The filter includes a first part, a second part, a ground part, a first coupling part and a second coupling part. Wherein, the first part is arranged on the first layer of the substrate for feeding in signals; the second part is arranged on the first layer for outputting the signals; the grounding part is arranged on the second layer of the substrate ; The first coupling part is arranged on the first layer, the first coupling part is electrically connected to the first part and the second part, and the first coupling part is connected to the ground part through a through hole ; The second coupling part is arranged on the first layer, the second coupling part is electrically connected with the first part and the second part, and the second coupling part is connected to the ground through the through hole Department connection. The filter provided by the invention has a very small volume and exhibits strong filtering efficiency in a limited space, which not only reduces the noise interference in the frequency band, but also facilitates the realization of light, thin and short product design.

Description

Translated fromChinese

滤波器filter

技术领域technical field

本发明涉及信号处理器件，尤其涉及一种滤波器。The present invention relates to a signal processing device, in particular to a filter.

背景技术Background technique

现阶段，大多数手机或者平板电脑都具备多频带的通信模式，如2.4G WIFI(Wireless-Fidelity，无线保真)和5G WIFI。但是预防5G频段噪声干扰的元器件极少，不利于信号的通信。At this stage, most mobile phones or tablet computers have multi-band communication modes, such as 2.4G WIFI (Wireless-Fidelity, wireless fidelity) and 5G WIFI. However, there are very few components to prevent noise interference in the 5G band, which is not conducive to signal communication.

发明内容SUMMARY OF THE INVENTION

有鉴于此，有必要提供一种预防5G频段信号干扰的元器件，以解决上述缺点。In view of this, it is necessary to provide a component for preventing signal interference in the 5G frequency band to solve the above shortcomings.

本发明实施方式提供的一种滤波器，设置于基板上，这种滤波器包括第一部，第二部，接地部，第一耦合部及第二耦合部。其中，第一部设置于基板的第一层，用于馈入信号；第二部设置于第一层，用于输出信号；接地部设置于基板的第二层；第一耦合部设置于第一层，第一耦合部与第一部和第二部电性连接，第一耦合部通过贯孔与接地部连接；第二耦合部设置于第一层，第二耦合部与第一部和第二部电性连接，第二耦合部通过贯孔与接地部连接。A filter provided by an embodiment of the present invention is disposed on a substrate, and the filter includes a first part, a second part, a ground part, a first coupling part and a second coupling part. The first part is arranged on the first layer of the substrate for feeding in signals; the second part is arranged on the first layer for outputting signals; the grounding part is arranged on the second layer of the substrate; the first coupling part is arranged on the first layer One layer, the first coupling part is electrically connected with the first part and the second part, the first coupling part is connected with the ground part through the through hole; the second coupling part is arranged on the first layer, the second coupling part is connected with the first part and the ground part The second portion is electrically connected, and the second coupling portion is connected to the ground portion through the through hole.

优选的，第一耦合部与第二耦合部相互平行。Preferably, the first coupling portion and the second coupling portion are parallel to each other.

优选的，第一耦合部包括第一分支和第二分支，第一分支和第二分支皆呈矩形，且相互平行。Preferably, the first coupling part includes a first branch and a second branch, and the first branch and the second branch are both rectangular and parallel to each other.

优选的，第一分支的长度与第二分支的长度相同。Preferably, the length of the first branch is the same as the length of the second branch.

优选的，第二耦合部包括第三分支和第四分支，第三分支和第四分支皆呈矩形，且皆与第一分支相互平行。Preferably, the second coupling portion includes a third branch and a fourth branch, and the third branch and the fourth branch are both rectangular and parallel to the first branch.

优选的，第三分支的长度和第四分支的长度与第一分支的长度相同。Preferably, the length of the third branch and the length of the fourth branch are the same as the length of the first branch.

优选的，滤波器还包括第一方形部，第二方形部，第三方形部及第四方形部。其中，第一方形部的第一端与第一部的第一端电性连接，第一方形部的第二端通过第一微带线与第一分支的第一端电性连接；第二方形部的第一端与第一部的第二端电性连接，第二方形部的第二端通过第二微带线与第三分支的第一端电性连接；第三方形部的第一端与第二部的第一端电性连接，第三方形部的第二端通过第三微带线与第一分支的第二端电性连接；第四方形部的第一端与第二部的第二端电性连接，第四方形部的第二端通过第四微带线与第三分支的第二端电性连接。第一方形部，第二方形部，第三方形部和第四方形部皆用于阻抗匹配。Preferably, the filter further includes a first square portion, a second square portion, a third square portion and a fourth square portion. Wherein, the first end of the first square portion is electrically connected to the first end of the first portion, and the second end of the first square portion is electrically connected to the first end of the first branch through the first microstrip line; The first end of the second square portion is electrically connected to the second end of the first portion, and the second end of the second square portion is electrically connected to the first end of the third branch through the second microstrip line; the third square portion is electrically connected to the first end of the third branch. The first end of the third square part is electrically connected to the first end of the second part, the second end of the third square part is electrically connected to the second end of the first branch through the third microstrip line; the first end of the fourth square part is electrically connected It is electrically connected to the second end of the second part, and the second end of the fourth square part is electrically connected to the second end of the third branch through a fourth microstrip line. The first square portion, the second square portion, the third square portion and the fourth square portion are all used for impedance matching.

优选的，第一微带线电性连接于第一方形部的第二端的中点和第一分支的第一端的中点之间；第二微带线电性连接于第二方形部的第二端的中点和第三分支的第一端的中点之间；第三微带线电性连接于第三方形部的第二端的中点和第一分支的第二端的中点之间；第四微带线电性连接于第四方形部的第二端的中点和第三分支的第二端的中点之间。Preferably, the first microstrip line is electrically connected between the midpoint of the second end of the first square portion and the midpoint of the first end of the first branch; the second microstrip line is electrically connected to the second square portion Between the midpoint of the second end of the third branch and the midpoint of the first end of the third branch; the third microstrip line is electrically connected between the midpoint of the second end of the third square part and the midpoint of the second end of the first branch The fourth microstrip line is electrically connected between the midpoint of the second end of the fourth square portion and the midpoint of the second end of the third branch.

优选的，贯孔包括第一贯孔，第二贯孔，第三贯孔及第四贯孔。其中，第一贯孔的孔壁电性连接于第二分支的第一端和接地部之间；第二贯孔的孔壁电性连接于第二分支的第二端和接地部之间；第三贯孔的孔壁电性连接于第四分支的第一端和接地部之间；第四贯孔的孔壁电性连接于第四分支的第二端和接地部之间。Preferably, the through holes include a first through hole, a second through hole, a third through hole and a fourth through hole. Wherein, the hole wall of the first through hole is electrically connected between the first end of the second branch and the ground portion; the hole wall of the second through hole is electrically connected between the second end of the second branch and the ground portion; The hole wall of the third through hole is electrically connected between the first end of the fourth branch and the ground portion; the hole wall of the fourth through hole is electrically connected between the second end of the fourth branch and the ground portion.

优选的，第一贯孔在第一层的中心与第二分支的第一端的中点重合；第二贯孔在第一层的中心与第二分支的第二端的中点重合；第三贯孔在第一层的中心与第四分支的第一端的中点重合；第四贯孔在第一层的中心与第四分支的第二端的中点重合。Preferably, the center of the first through hole in the first layer coincides with the midpoint of the first end of the second branch; the second through hole in the center of the first layer coincides with the midpoint of the second end of the second branch; the third The center of the through hole in the first layer coincides with the midpoint of the first end of the fourth branch; the center of the fourth through hole in the first layer coincides with the midpoint of the second end of the fourth branch.

本发明提供的滤波器，体积非常小，在有限的空间内展现了强大的滤波效能，既减小了频段内的噪声干扰，也有利于实现轻薄短小的产品设计。The filter provided by the invention has a very small volume and exhibits strong filtering efficiency in a limited space, which not only reduces the noise interference in the frequency band, but also facilitates the realization of light, thin and short product design.

附图说明Description of drawings

图1为本发明滤波器一实施方式的俯视图。FIG. 1 is a top view of an embodiment of the filter of the present invention.

图2为本发明滤波器一实施方式的侧视图。FIG. 2 is a side view of an embodiment of the filter of the present invention.

图3为本发明滤波器一实施方式的散射参数S21的量测图。FIG. 3 is a measurement diagram of the scattering parameter S21 of an embodiment of the filter of the present invention.

主要元件符号说明Description of main component symbols

第一层 01first floor 01

第二层 02second floor 02

接地部 03Ground 03

第一部 10Part 10

第一方形部 11First Square Section 11

第二方形部 12Second SquareSection 12

第一微带线 13Thefirst microstrip line 13

第二微带线 14Second microstrip line 14

第二部 20Part II 20

第三方形部 21Third Form 21

第四方形部 22Fourth SquareSection 22

第三微带线 23Third microstrip line 23

第四微带线 24Fourth microstrip line 24

第一耦合部 30first coupling part 30

第一分支 31first branch 31

第二分支 32second branch 32

第一贯孔 321first throughhole 321

第二贯孔 322Second throughhole 322

第二耦合部 40second coupling part 40

第三分支 41third branch 41

第四分支 42Fourth branch 42

第三贯孔 421Third throughhole 421

第四贯孔 422Fourth throughhole 422

间隙 50Gap 50

如下具体实施方式将结合上述附图进一步说明本发明。The following specific embodiments will further illustrate the present invention in conjunction with the above drawings.

具体实施方式Detailed ways

请参阅图1和图2，图1为本发明滤波器一实施方式的俯视图。图2为本发明滤波器一实施方式的侧视图。在本实施方式中，图2的侧视图是从图1左下角的位置侧视滤波器的示意图。Please refer to FIG. 1 and FIG. 2. FIG. 1 is a top view of an embodiment of the filter of the present invention. FIG. 2 is a side view of an embodiment of the filter of the present invention. In this embodiment, the side view of FIG. 2 is a schematic diagram of the filter viewed from the side at the lower left corner of FIG. 1 .

本发明的滤波器设置于基板上，用于对信号进行滤波处理，从而抑制噪声的干扰。所述基板为常用的印制电路板(PCB，Printed Circuit Board)，其电气特性可以根据所要抑制的信号频率进行选择。如选择最常用的玻璃纤维环氧树脂覆铜板(FR-4覆铜板)等的多层板。如图1和图2所示，滤波器包括第一部10，第二部20，接地部03，第一耦合部30及第二耦合部40。The filter of the present invention is arranged on the substrate, and is used for filtering the signal, thereby suppressing the interference of noise. The substrate is a common printed circuit board (PCB, Printed Circuit Board), and its electrical characteristics can be selected according to the frequency of the signal to be suppressed. For example, choose the most commonly used glass fiber epoxy resin copper clad laminate (FR-4 copper clad laminate) and other multi-layer boards. As shown in FIG. 1 and FIG. 2 , the filter includes afirst part 10 , asecond part 20 , a ground part 03 , afirst coupling part 30 and asecond coupling part 40 .

其中，第一部10设置于基板的第一层01，用于馈入信号。第二部20设置于第一层01，用于输出信号。接地部03设置于基板的第二层02。第一耦合部30设置于第一层01，第一耦合部30与第一部10、第二部20电性连接，第一耦合部30通过贯孔与接地部03连接。第二耦合部40，设置于第一层01，第二耦合部40与第一部10、第二部20电性连接，第二耦合部40通过贯孔与接地部03连接。Wherein, thefirst part 10 is disposed on the first layer 01 of the substrate for feeding in signals. Thesecond part 20 is disposed on the first layer 01 for outputting signals. The ground portion 03 is provided on the second layer 02 of the substrate. Thefirst coupling portion 30 is disposed on the first layer 01 . Thefirst coupling portion 30 is electrically connected to thefirst portion 10 and thesecond portion 20 , and thefirst coupling portion 30 is connected to the ground portion 03 through a through hole. Thesecond coupling portion 40 is disposed on the first layer 01 . Thesecond coupling portion 40 is electrically connected to thefirst portion 10 and thesecond portion 20 , and thesecond coupling portion 40 is connected to the ground portion 03 through a through hole.

在本实施方式中，基板为两层的PCB，即第一层01在基板的一个表面，第二层02在基板的另一个表面。在其他实施方式中，基板亦可以采用多层PCB，其第一层01和第二层02可以在该基板的表面或内层，在此不做限定。In this embodiment, the substrate is a two-layer PCB, that is, the first layer 01 is on one surface of the substrate, and the second layer 02 is on the other surface of the substrate. In other embodiments, the substrate may also be a multi-layer PCB, and the first layer 01 and the second layer 02 may be on the surface or inner layer of the substrate, which is not limited herein.

如图1所示，在第一层01中，第一耦合部30与第二耦合部40相互平行。第一耦合部30与第二耦合部40没有通过一些导体进行连接，它们之间存在间隙50。第一耦合部30包括第一分支31和第二分支32。第一分支31和第二分支32皆呈矩形，且相互平行，第一分支31和第二分支32也没有通过一些导体进行连接。第一分支31的长度与第二分支32的长度相同。第二耦合部40包括第三分支41和第四分支42，第三分支41和第四分支42皆呈矩形，且皆与第一分支31相互平行。第三分支41和第四分支42也没有通过一些导体进行连接。第三分支41的长度和第四分支42的长度与第一分支31的长度相同。As shown in FIG. 1 , in the first layer 01 , thefirst coupling portion 30 and thesecond coupling portion 40 are parallel to each other. Thefirst coupling part 30 and thesecond coupling part 40 are not connected by some conductors, and there is agap 50 between them. Thefirst coupling part 30 includes afirst branch 31 and asecond branch 32 . Thefirst branch 31 and thesecond branch 32 are both rectangular and parallel to each other, and thefirst branch 31 and thesecond branch 32 are not connected by some conductors. The length of thefirst branch 31 is the same as the length of thesecond branch 32 . Thesecond coupling portion 40 includes athird branch 41 and afourth branch 42 . Thethird branch 41 and thefourth branch 42 are both rectangular and parallel to thefirst branch 31 . Thethird branch 41 and thefourth branch 42 are also not connected by some conductors. The length of thethird branch 41 and the length of thefourth branch 42 are the same as the length of thefirst branch 31 .

在本实施方式中，为了使滤波器有更好的性能，优选地，滤波器还可以包括：第一方形部11，第二方形部12，第三方形部21及第四方形部22。在本实施方式中，各个方形部皆呈正方形。第一方形部11，第二方形部12，第三方形部21和第四方形部22皆用于进行阻抗匹配。In this embodiment, in order to make the filter have better performance, preferably, the filter may further include: a first square part 11 , a secondsquare part 12 , a thirdsquare part 21 and a fourthsquare part 22 . In this embodiment, each square portion is square. The first square portion 11 , the secondsquare portion 12 , the thirdsquare portion 21 and the fourthsquare portion 22 are all used for impedance matching.

其中，第一方形部11的第一端与第一部10的第一端电性连接，第一方形部11的第二端通过第一微带线13与第一分支31的第一端电性连接。第二方形部12的第一端与第一部10的第二端电性连接，第二方形部12的第二端通过第二微带线14与第三分支41的第一端电性连接。第三方形部21的第一端与第二部20的第一端电性连接，第三方形部21的第二端通过第三微带线23与第一分支31的第二端电性连接。第四方形部22的第一端与第二部20的第二端电性连接，第四方形部22的第二端通过第四微带线24与第三分支41的第二端电性连接。The first end of the first square portion 11 is electrically connected to the first end of thefirst portion 10 , and the second end of the first square portion 11 is connected to the first end of thefirst branch 31 through thefirst microstrip line 13 . Terminal electrical connection. The first end of the secondsquare portion 12 is electrically connected to the second end of thefirst portion 10 , and the second end of the secondsquare portion 12 is electrically connected to the first end of thethird branch 41 through thesecond microstrip line 14 . The first end of thethird shape portion 21 is electrically connected to the first end of thesecond portion 20 , and the second end of thethird shape portion 21 is electrically connected to the second end of thefirst branch 31 through thethird microstrip line 23 . The first end of the fourthsquare portion 22 is electrically connected to the second end of thesecond portion 20 , and the second end of the fourthsquare portion 22 is electrically connected to the second end of thethird branch 41 through thefourth microstrip line 24 .

在本实施方式中，第一微带线13电性连接于第一方形部11的第二端的中点和第一分支31的第一端的中点之间。第二微带线14电性连接于第二方形部12的第二端的中点和第三分支41的第一端的中点之间。第三微带线23电性连接于第三方形部21的第二端的中点和第一分支31的第二端的中点之间。第四微带线24电性连接于第四方形部22的第二端的中点和第三分支41的第二端的中点之间。In this embodiment, thefirst microstrip line 13 is electrically connected between the midpoint of the second end of the first square portion 11 and the midpoint of the first end of thefirst branch 31 . Thesecond microstrip line 14 is electrically connected between the midpoint of the second end of the secondsquare portion 12 and the midpoint of the first end of thethird branch 41 . Thethird microstrip line 23 is electrically connected between the midpoint of the second end of thethird shape portion 21 and the midpoint of the second end of thefirst branch 31 . Thefourth microstrip line 24 is electrically connected between the midpoint of the second end of the fourthsquare portion 22 and the midpoint of the second end of thethird branch 41 .

在本实施方式中，滤波器设置了四个用于连接接地部03的贯孔。其中，第一贯孔321的孔壁电性连接于第二分支32的第一端和接地部03之间。第二贯孔322的孔壁电性连接于第二分支32的第二端和接地部03之间。第三贯孔421的孔壁电性连接于第四分支42的第一端和接地部03之间。第四贯孔422的孔壁电性连接于第四分支42的第二端和接地部03之间。In the present embodiment, the filter is provided with four through holes for connecting the ground portion 03 . The hole wall of the first throughhole 321 is electrically connected between the first end of thesecond branch 32 and the grounding portion 03 . The hole wall of the second throughhole 322 is electrically connected between the second end of thesecond branch 32 and the grounding portion 03 . The hole wall of the third throughhole 421 is electrically connected between the first end of thefourth branch 42 and the grounding portion 03 . The hole wall of the fourth throughhole 422 is electrically connected between the second end of thefourth branch 42 and the grounding portion 03 .

第一贯孔321在第一层01的中心与第二分支32的第一端的中点重合。第二贯孔322在第一层01的中心与第二分支32的第二端的中点重合。第三贯孔421在第一层01的中心与第四分支42的第一端的中点重合。第四贯孔422在第一层01的中心与第四分支42的第二端的中点重合。The center of the first throughhole 321 coincides with the center of the first end of thesecond branch 32 at the center of the first layer 01 . The center of the second throughhole 322 coincides with the center of the second end of thesecond branch 32 at the center of the first layer 01 . The center of the third throughhole 421 coincides with the center of the first end of thefourth branch 42 at the center of the first layer 01 . The center of the fourth throughhole 422 coincides with the center of the second end of thefourth branch 42 at the center of the first layer 01 .

请参阅图3，图3为本发明滤波器一实施方式的散射参数S21的量测图。Please refer to FIG. 3 . FIG. 3 is a measurement diagram of the scattering parameter S21 of an embodiment of the filter of the present invention.

从图3可知，在曲线最低点时，即频率点在5.163兆赫兹(GHz)时，滤波器能达到-47.880dB的水平，也就是说，当5G信号经过该滤波器时，能够很好的传导过去，其他频段的信号经过该滤波器时，并不能无损耗地传输过去，从而该滤波器适用于处理5G频段的噪声干扰。As can be seen from Figure 3, at the lowest point of the curve, that is, when the frequency point is 5.163 megahertz (GHz), the filter can reach the level of -47.880dB, that is to say, when the 5G signal passes through the filter, it can be well In the past, when signals in other frequency bands pass through the filter, they cannot be transmitted without loss, so the filter is suitable for dealing with noise interference in the 5G frequency band.

此外，此滤波器可以设置在4毫米乘以6.4毫米的PCB面积中，所占空间非常小。本发明提供的滤波器，体积非常小，在有限的空间内展现了强大的滤波效能，既减小了频段内的噪声干扰，也有利于实现轻薄短小的产品设计。Additionally, this filter can be placed in a 4mm by 6.4mm PCB area with a very small footprint. The filter provided by the invention has a very small volume and exhibits strong filtering efficiency in a limited space, which not only reduces the noise interference in the frequency band, but also facilitates the realization of light, thin and short product design.

Claims (10)

Translated fromChinese

1.一种滤波器，设置于基板上，其特征在于，包括：1. A filter, arranged on a substrate, is characterized in that, comprising:第一部，设置于所述基板的第一层，用于馈入信号；The first part is arranged on the first layer of the substrate and is used for feeding in signals;第二部，设置于所述第一层，用于输出所述信号；The second part is arranged on the first layer and is used for outputting the signal;接地部，设置于所述基板的第二层；a grounding part, arranged on the second layer of the substrate;第一耦合部，包括第一分支和第二分支，设置于所述第一层，所述第一分支两端分别与所述第一部和所述第二部电性连接，所述第二分支通过贯孔与所述接地部连接，所述第一分支与所述第二分支不相连；及The first coupling part, including a first branch and a second branch, is disposed on the first layer, two ends of the first branch are electrically connected to the first part and the second part respectively, and the second the branch is connected to the ground portion through the through hole, and the first branch is not connected to the second branch; and第二耦合部，包括第三分支和第四分支，设置于所述第一层，所述第三分支两端分别与所述第一部和所述第二部电性连接，所述第四分支通过所述贯孔与所述接地部连接，所述第三分支与所述第四分支不相连。The second coupling part includes a third branch and a fourth branch, and is disposed on the first layer. Both ends of the third branch are electrically connected to the first part and the second part, respectively. The fourth The branch is connected to the ground portion through the through hole, and the third branch is not connected to the fourth branch.2.如权利要求1所述的滤波器，其特征在于，所述第一耦合部与所述第二耦合部相互平行。2 . The filter of claim 1 , wherein the first coupling portion and the second coupling portion are parallel to each other. 3 .3.如权利要求1所述的滤波器，其特征在于，所述第一分支和所述第二分支皆呈矩形，且相互平行。3 . The filter of claim 1 , wherein the first branch and the second branch are both rectangular and parallel to each other. 4 .4.如权利要求3所述的滤波器，其特征在于，所述第一分支的长度与所述第二分支的长度相同。4. The filter of claim 3, wherein the length of the first branch is the same as the length of the second branch.5.如权利要求3所述的滤波器，其特征在于，所述第三分支和所述第四分支皆呈矩形，且皆与所述第一分支相互平行。5 . The filter of claim 3 , wherein the third branch and the fourth branch are both rectangular and parallel to the first branch. 6 .6.如权利要求5所述的滤波器，其特征在于，所述第三分支的长度和所述第四分支的长度与所述第一分支的长度相同。6. The filter of claim 5, wherein the length of the third branch and the length of the fourth branch are the same as the length of the first branch.7.如权利要求5所述的滤波器，其特征在于，所述滤波器还包括：7. The filter of claim 5, wherein the filter further comprises:第一方形部，所述第一方形部的第一端与所述第一部的第一端电性连接，所述第一方形部的第二端通过第一微带线与所述第一分支的第一端电性连接；The first square part, the first end of the first square part is electrically connected with the first end of the first part, and the second end of the first square part is connected to the first part through the first microstrip line. the first end of the first branch is electrically connected;第二方形部，所述第二方形部的第一端与所述第一部的第二端电性连接，所述第二方形部的第二端通过第二微带线与所述第三分支的第一端电性连接；The second square part, the first end of the second square part is electrically connected to the second end of the first part, the second end of the second square part is connected to the third square part through the second microstrip line The first end of the branch is electrically connected;第三方形部，所述第三方形部的第一端与所述第二部的第一端电性连接，所述第三方形部的第二端通过第三微带线与所述第一分支的第二端电性连接；及a third-shaped part, the first end of the third-shaped part is electrically connected with the first end of the second part, and the second end of the third-shaped part is connected to the first through a third microstrip line the second end of the branch is electrically connected; and第四方形部，所述第四方形部的第一端与所述第二部的第二端电性连接，所述第四方形部的第二端通过第四微带线与所述第三分支的第二端电性连接；a fourth square part, the first end of the fourth square part is electrically connected to the second end of the second part, the second end of the fourth square part is connected to the third square part through a fourth microstrip line the second end of the branch is electrically connected;其中，所述第一方形部，所述第二方形部，所述第三方形部和所述第四方形部皆用于进行阻抗匹配。Wherein, the first square portion, the second square portion, the third square portion and the fourth square portion are all used for impedance matching.8.如权利要求7所述的滤波器，其特征在于，8. The filter of claim 7, wherein第一微带线电性连接于所述第一方形部的第二端的中点和所述第一分支的第一端的中点之间；The first microstrip line is electrically connected between the midpoint of the second end of the first square portion and the midpoint of the first end of the first branch;第二微带线电性连接于所述第二方形部的第二端的中点和所述第三分支的第一端的中点之间；The second microstrip line is electrically connected between the midpoint of the second end of the second square portion and the midpoint of the first end of the third branch;第三微带线电性连接于所述第三方形部的第二端的中点和所述第一分支的第二端的中点之间；及A third microstrip line is electrically connected between the midpoint of the second end of the third shape portion and the midpoint of the second end of the first branch; and第四微带线电性连接于所述第四方形部的第二端的中点和所述第三分支的第二端的中点之间。The fourth microstrip line is electrically connected between the midpoint of the second end of the fourth square portion and the midpoint of the second end of the third branch.9.如权利要求5所述的滤波器，其特征在于，所述贯孔包括：9. The filter of claim 5, wherein the through hole comprises:第一贯孔，所述第一贯孔的孔壁电性连接于所述第二分支的第一端和所述接地部之间；a first through hole, the hole wall of the first through hole is electrically connected between the first end of the second branch and the ground portion;第二贯孔，所述第二贯孔的孔壁电性连接于所述第二分支的第二端和所述接地部之间；a second through hole, the hole wall of which is electrically connected between the second end of the second branch and the ground portion;第三贯孔，所述第三贯孔的孔壁电性连接于所述第四分支的第一端和所述接地部之间；及a third through hole, the hole wall of which is electrically connected between the first end of the fourth branch and the ground portion; and第四贯孔，所述第四贯孔的孔壁电性连接于所述第四分支的第二端和所述接地部之间。A fourth through hole, the hole wall of which is electrically connected between the second end of the fourth branch and the ground portion.10.如权利要求9所述的滤波器，其特征在于：10. The filter of claim 9, wherein:所述第一贯孔在所述第一层的中心与所述第二分支的第一端的中点重合；The center of the first through hole in the first layer coincides with the midpoint of the first end of the second branch;所述第二贯孔在所述第一层的中心与所述第二分支的第二端的中点重合；The center of the second through hole in the first layer coincides with the midpoint of the second end of the second branch;所述第三贯孔在所述第一层的中心与所述第四分支的第一端的中点重合；及the center of the third through hole in the first layer coincides with the midpoint of the first end of the fourth branch; and所述第四贯孔在所述第一层的中心与所述第四分支的第二端的中点重合。The fourth through hole coincides with the center of the second end of the fourth branch at the center of the first layer.

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