CN108736111B - Filter with a filter element having a plurality of filter elements - Google Patents
Filter with a filter element having a plurality of filter elements Download PDFInfo
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- CN108736111B CN108736111B CN201710239764.XA CN201710239764A CN108736111B CN 108736111 B CN108736111 B CN 108736111B CN 201710239764 A CN201710239764 A CN 201710239764A CN 108736111 B CN108736111 B CN 108736111B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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Abstract
A filter is arranged on a substrate and comprises a first portion, a second portion, a grounding portion, a first coupling portion and a second coupling portion. The first part is arranged on the first layer of the substrate and is used for feeding signals; the second part is arranged on the first layer and used for outputting the signal; the grounding part is arranged on the second layer of the substrate; the first coupling part is arranged on the first layer, is electrically connected with the first part and the second part, and is connected with the grounding part through the through hole; the second coupling portion is arranged on the first layer, electrically connected with the first portion and the second portion, and connected with the grounding portion through the through hole. The filter provided by the invention has very small volume, shows strong filtering efficiency in a limited space, reduces noise interference in a frequency band, and is beneficial to realizing light, thin, short and small product design.
Description
Technical Field
The present invention relates to a signal processing device, and more particularly, to a filter.
Background
At present, most mobile phones or tablet computers have a multi-band communication mode, such as 2.4G WIFI (Wireless-Fidelity, Wireless Fidelity) and 5G WIFI. However, few components are used for preventing noise interference in the 5G frequency band, which is not favorable for signal communication.
Disclosure of Invention
In view of the above, it is desirable to provide a device for preventing interference of signals in 5G band, so as to solve the above-mentioned disadvantages.
The filter provided by the embodiment of the invention is arranged on a substrate and comprises a first part, a second part, a grounding part, a first coupling part and a second coupling part. The first part is arranged on the first layer of the substrate and is used for feeding signals; the second part is arranged on the first layer and used 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, electrically connected with the first part and the second part and connected with the grounding part through the through hole; the second coupling portion is arranged on the first layer, electrically connected with the first portion and the second portion, and connected with the grounding portion through the through hole.
Preferably, the first coupling part and the second coupling part are parallel to each other.
Preferably, the first coupling portion includes a first branch and a second branch, and the first branch and the second branch are rectangular and parallel to each other.
Preferably, the length of the first branch is the same as the length of the second branch.
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 are both parallel to the first branch.
Preferably, the length of the third branch and the length of the fourth branch are the same as the length of the first branch.
Preferably, the filter further includes a first square portion, a second square portion, a third square portion, and a fourth square portion. 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 electrically connected with the first end of the first branch through a first microstrip line; the first end of the second square part is electrically connected with the second end of the first part, and the second end of the second square part is electrically connected with the first end of the third branch through a second microstrip line; the first end of the third square part is electrically connected with the first end of the second part, and the second end of the third square part is electrically connected with the second end of the first branch through a third microstrip line; the first end of the fourth square part is electrically connected with the second end of the second part, and the second end of the fourth square part is electrically connected with the second end of the third branch through the fourth microstrip line. The first square portion, the second square portion, the third square portion and the fourth square portion are used for impedance matching.
Preferably, the first microstrip line is electrically connected between a midpoint of the second end of the first square part and a midpoint of the first end of the first branch; the second microstrip line is electrically connected between the midpoint of the second end of the second square part 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 part and the midpoint of the second end of the third branch.
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 grounding part; the hole wall of the second through hole is electrically connected between the second end of the second branch and the grounding part; the hole wall of the third through hole is electrically connected between the first end of the fourth branch and the grounding part; the hole wall of the fourth through hole is electrically connected between the second end of the fourth branch and the grounding part.
Preferably, the first through hole coincides with a midpoint of the first end of the second branch at the center of the first layer; the second through hole is superposed with the midpoint of the second end of the second branch at the center of the first layer; the third through hole is superposed with the midpoint of the first end of the fourth branch at the center of the first layer; the fourth through hole is superposed with the midpoint of the second end of the fourth branch at the center of the first layer.
The filter provided by the invention has very small volume, shows strong filtering efficiency in a limited space, reduces noise interference in a frequency band, and is beneficial to realizing light, thin, short and small product design.
Drawings
Fig. 1 is a top view of an embodiment of a filter according to the present invention.
Fig. 2 is a side view of an embodiment of a filter of the present invention.
Fig. 3 is a graph of scattering parameter S21 measurement according to an embodiment of the filter of the present invention.
Description of the main elements
First layer 01
Second layer 02
Grounding part 03
First square part 11
Second square part 12
Third square part 21
Fourth square part 22
First through hole 321
Second through hole 322
Third through hole 421
Fourth via 422
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1 and 2, fig. 1 is a top view of an embodiment of a filter according to the present invention. Fig. 2 is a side view of an embodiment of a filter of the present invention. In this embodiment, the side view of fig. 2 is a schematic diagram of the filter viewed from the lower left corner of fig. 1.
The filter of the invention is arranged on the substrate and is used for filtering signals so as to inhibit the interference of noise. The substrate is a Printed Circuit Board (PCB) that is commonly used, and the electrical characteristics of the PCB can be selected according to the frequency of the signal to be suppressed. Such as a multilayer board selected from the most commonly used glass fiber epoxy resin copper clad laminate (FR-4 copper clad laminate) and the like. As shown in fig. 1 and 2, the filter includes a first portion 10, a second portion 20, a ground portion 03, a first coupling portion 30, and a second coupling portion 40.
The first portion 10 is disposed on the first layer 01 of the substrate and is used for feeding signals. The second portion 20 is disposed on the first layer 01, and outputs a signal. The ground portion 03 is provided in the second layer 02 of the substrate. The first coupling portion 30 is disposed on the first layer 01, the first coupling portion 30 is electrically connected to the first portion 10 and the second portion 20, and the first coupling portion 30 is connected to the grounding portion 03 through a through hole. The second coupling portion 40 is disposed on the first layer 01, the second coupling portion 40 is electrically connected to the first portion 10 and the second portion 20, and the second coupling portion 40 is connected to the grounding portion 03 through a through hole.
In this embodiment, the substrate is a two-layer PCB, i.e. 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 an inner layer of the substrate, which is not limited herein.
As shown in fig. 1, in the first layer 01, the first coupling part 30 and the second coupling part 40 are parallel to each other. The first coupling part 30 and the second coupling part 40 are not connected by some conductors, and a gap 50 exists between them. The first coupling part 30 comprises a first branch 31 and a second branch 32. The first branch 31 and the second branch 32 are rectangular and parallel to each other, and the first branch 31 and the second branch 32 are not connected by some conductors. The length of the first branch 31 is the same as the length of the second branch 32. The second coupling portion 40 comprises a third branch 41 and a fourth branch 42, the third branch 41 and the fourth branch 42 are rectangular and parallel to the first branch 31. The third branch 41 and the fourth branch 42 are also not connected by some conductors. The length of the third branch 41 and the length of the fourth branch 42 are the same as the length of the first branch 31.
In this embodiment, in order to make the filter have better performance, preferably, the filter may further include: a first square portion 11, a second square portion 12, a third square portion 21 and a fourth square portion 22. In the present embodiment, each square portion is square. The first square portion 11, the second square portion 12, the third square portion 21, and the fourth square portion 22 are all used for impedance matching.
A first end of the first square portion 11 is electrically connected to a first end of the first portion 10, and a second end of the first square portion 11 is electrically connected to a first end of the first branch 31 through the first microstrip line 13. A first end of the second square portion 12 is electrically connected to a second end of the first portion 10, and a second end of the second square portion 12 is electrically connected to a first end of the third branch 41 through the second microstrip line 14. The first end of the third square portion 21 is electrically connected to the first end of the second portion 20, and the second end of the third square portion 21 is electrically connected to the second end of the first branch 31 through the third microstrip line 23. A first end of the fourth square portion 22 is electrically connected to the second end of the second portion 20, and a second end of the fourth square portion 22 is electrically connected to the second end of the third branch 41 through the fourth microstrip line 24.
In the present embodiment, the first 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 the first branch 31. The second microstrip line 14 is electrically connected between a midpoint of the second end of the second square portion 12 and a midpoint of the first end of the third branch 41. The third microstrip line 23 is electrically connected between a midpoint of the second end of the third square portion 21 and a midpoint of the second end of the first branch 31. The fourth microstrip line 24 is electrically connected between a midpoint of the second end of the fourth square portion 22 and a midpoint of the second end of the third branch 41.
In the present embodiment, the filter is provided with four through holes for connecting the ground 03. The hole wall of the first through hole 321 is electrically connected between the first end of the second branch 32 and the ground 03. The wall of the second through hole 322 is electrically connected between the second end of the second branch 32 and the ground 03. The hole wall of the third through hole 421 is electrically connected between the first end of the fourth branch 42 and the ground 03. The wall of the fourth through hole 422 is electrically connected between the second end of the fourth branch 42 and the ground 03.
The first via 321 coincides with a midpoint of the first end of the second branch 32 at the center of the first layer 01. The second via 322 coincides with a midpoint of the second end of the second branch 32 at the center of the first layer 01. The third via 421 coincides with the midpoint of the first end of the fourth branch 42 at the center of the first layer 01. The fourth via 422 coincides with the midpoint of the second end of the fourth branch 42 at the center of the first layer 01.
Referring to fig. 3, fig. 3 is a diagram illustrating a scattering parameter S21 measurement according to an embodiment of the filter of the present invention.
As can be seen from fig. 3, at the lowest point of the curve, i.e. at the frequency point of 5.163 megahertz (GHz), the filter can reach the level of-47.880 dB, that is, when a 5G signal passes through the filter, the signal can be well conducted, and when signals of other frequency bands pass through the filter, the signal cannot be transmitted without loss, so that the filter is suitable for processing noise interference of the 5G frequency band.
In addition, the filter can be arranged in the area of the PCB of 4 mm multiplied by 6.4 mm, and the occupied space is very small. The filter provided by the invention has very small volume, shows strong filtering efficiency in a limited space, reduces noise interference in a frequency band, and is beneficial to realizing light, thin, short and small product design.
Claims (10)
1. A filter disposed on a substrate, comprising:
the first part is arranged on the first layer of the substrate and is used for feeding signals;
a second section provided in the first layer, for outputting the signal;
a ground portion disposed on a second layer of the substrate;
the first coupling part comprises a first branch and a second branch, the first branch and the second branch are arranged on the first layer, two ends of the first branch are respectively and electrically connected with the first part and the second part, the second branch is connected with the grounding part through a through hole, and the first branch is not connected with the second branch; and
the second coupling part comprises a third branch and a fourth branch, the third branch and the fourth branch are arranged on the first layer, two ends of the third branch are respectively and electrically connected with the first part and the second part, the fourth branch is connected with the grounding part through the through hole, and the third branch is not connected with the fourth branch.
2. The filter of claim 1, wherein the first coupling portion and the second coupling portion are parallel to each other.
3. The filter of claim 1, wherein the first branch and the second branch are both rectangular and parallel to each other.
4. The filter of claim 3, wherein the length of the first branch is the same as the length of the second branch.
5. The filter of claim 3, wherein the third branch and the fourth branch are both rectangular and are both parallel to the first branch.
6. The filter of claim 5, wherein a length of the third branch and a length of the fourth branch are the same as a length of the first branch.
7. The filter of claim 5, wherein the filter further comprises:
a first end of the first square part is electrically connected with a first end of the first part, and a second end of the first square part is electrically connected with a first end of the first branch through a first microstrip line;
a first end of the first square part is electrically connected with a first end of the first branch, and a second end of the first square part is electrically connected with a first end of the third branch through a first microstrip line;
a third square part, a first end of the third square part being electrically connected to a first end of the second part, a second end of the third square part being electrically connected to a second end of the first branch through a third microstrip line; and
a first end of the fourth square portion is electrically connected with the second end of the second portion, and a second end of the fourth square portion is electrically connected with 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.
8. The filter of claim 7,
the first microstrip line is electrically connected between the midpoint of the second end of the first square part and the midpoint of the first end of the first branch;
the second microstrip line is electrically connected between the midpoint of the second end of the second square part 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; and
the fourth microstrip line is electrically connected between the midpoint of the second end of the fourth square part and the midpoint of the second end of the third branch.
9. The filter of claim 5, wherein the via comprises:
the wall of the first through hole is electrically connected between the first end of the second branch and the grounding part;
the hole wall of the second through hole is electrically connected between the second end of the second branch and the grounding part;
the hole wall of the third through hole is electrically connected between the first end of the fourth branch and the grounding part; and
and the hole wall of the fourth through hole is electrically connected between the second end of the fourth branch and the grounding part.
10. The filter of claim 9, wherein:
the first through hole is superposed with the midpoint of the first end of the second branch at the center of the first layer;
the second through hole is superposed with the midpoint of the second end of the second branch at the center of the first layer;
the third through hole is superposed with the midpoint of the first end of the fourth branch at the center of the first layer; and
the fourth through hole is overlapped with the midpoint of the second end of the fourth branch at the center of the first layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239764.XA CN108736111B (en) | 2017-04-13 | 2017-04-13 | Filter with a filter element having a plurality of filter elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239764.XA CN108736111B (en) | 2017-04-13 | 2017-04-13 | Filter with a filter element having a plurality of filter elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108736111A CN108736111A (en) | 2018-11-02 |
| CN108736111B true CN108736111B (en) | 2020-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710239764.XA Expired - Fee Related CN108736111B (en) | 2017-04-13 | 2017-04-13 | Filter with a filter element having a plurality of filter elements |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108736111B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552494A (en) * | 2016-01-28 | 2016-05-04 | 华南理工大学 | Adjustable flat band-pass and band-stop filter |
| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN207165728U (en) * | 2017-10-10 | 2018-03-30 | 成都大学 | A kind of compact-sized ultra wide band bandpass filter |
-
2017
- 2017-04-13 CN CN201710239764.XA patent/CN108736111B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN105552494A (en) * | 2016-01-28 | 2016-05-04 | 华南理工大学 | Adjustable flat band-pass and band-stop filter |
| CN207165728U (en) * | 2017-10-10 | 2018-03-30 | 成都大学 | A kind of compact-sized ultra wide band bandpass filter |
Non-Patent Citations (1)
| Title |
|---|
| "Novel Wideband Bandpass Filter Using Open-Ended Stub Loaded Parallel Coupled Short-Circuited Three-Line Unit";Chun-Ping Chen et al;《2009 IEEE MTT-S international microwave symposium digest》;20090612;图4 * |
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| Publication number | Publication date |
|---|---|
| CN108736111A (en) | 2018-11-02 |
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