CN206673067U - Double frequency band-pass filter based on open-circuited load and short circuit load - Google Patents
Double frequency band-pass filter based on open-circuited load and short circuit load Download PDFInfo
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- CN206673067U CN206673067U CN201720265249.4U CN201720265249U CN206673067U CN 206673067 U CN206673067 U CN 206673067U CN 201720265249 U CN201720265249 U CN 201720265249U CN 206673067 U CN206673067 U CN 206673067U
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- short circuit
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Abstract
The utility model provides a kind of double frequency band-pass filter based on open-circuited load and short circuit load, including etching in two first microstrip lines, input, output end and the second microstrip line of dielectric-slab upper surface.The both ends of each first microstrip line set open-circuited load and short circuit load respectively, and the middle part of two first microstrip lines is connected by the second microstrip line；Wherein on first microstrip line, output end is connected on another first microstrip line for input connection；The both ends of second microstrip line are connected with input, output end and are located at same horizontal line respectively, and the horizontal line is mutually perpendicular to as the first central axis, the second central axis with the first central axis；The end of short circuit load sets short circuit metallic post, and short circuit metallic post is connected with being arranged on the ground metal layer of dielectric-slab lower surface.Double frequency band-pass filter of the present utility model has good inhibition to out of band signal, has high selectivity, introducing noise is few, avoids interfering radio-frequency front-end.
Description
Technical field
Frequency microwave communication technical field is the utility model is related to, more particularly to one kind is based on open-circuited load and short circuit load
Double frequency band-pass filter.
Background technology
A kind of critically important device of the wave filter as radio-frequency front-end, can filter out out-of-band noise, improve the spirit of circuit system
Sensitivity.Microstrip filter is a kind of device for separating different frequency microwave signal.Its main function is to suppress not needing
Signal, prevent it from by wave filter, only allowing the signal of needs to pass through.In microwave circuit system, the performance pair of wave filter
The performance indications of circuit system have a great impact.Due to the diversity of communications band in Modern Communication System, prior art
The selectivity of bandpass filter is often inadequate, it is impossible to meets the multifarious demand of communications band, have impact on whole communication system
Performance.
Utility model content
The purpose of this utility model is to provide a kind of double frequency band-pass filter based on open-circuited load and short circuit load, purport
In the not high technical problem of the selectivity for solving bandpass filter of the prior art.
To achieve the above object, the utility model provides a kind of based on the filter of the double frequency band-pass of open-circuited load and short circuit load
Ripple device, including dielectric-slab, etching dielectric-slab upper surface two first microstrip lines, input, output end and the second microstrip line,
And the ground metal layer of dielectric-slab lower surface is arranged on, the double frequency band-pass filter is symmetrical above and below on the first central axis
And it is symmetrical on the second central axis, wherein：
The both ends of each first microstrip line are respectively arranged with open-circuited load and short circuit load, two first microstrip lines
Middle part is connected by the second microstrip line；
One end of the open-circuited load and one end of short circuit load are arranged on first micro-strip with mutually orthogonal angle
The both ends of line and be interconnected；
One end of the input is disposed therein the middle part of first microstrip line and the other end extension of the input
To a long edge of dielectric-slab；
One end of the output end is disposed therein the middle part of another first microstrip line and the other end of the output end prolongs
Extend another long edge of dielectric-slab；
The both ends of second microstrip line connect with input, output end and in same horizontal lines respectively, the level
Line is mutually perpendicular to as the first central axis, the second central axis with the first central axis；
The end of the short circuit load is provided with short circuit metallic post, and the short circuit metallic post penetrates from the upper surface of dielectric-slab
To the lower surface of dielectric-slab, and the ground metal layer with being arranged on dielectric-slab lower surface is connected.
Preferably, the ground metal layer is the deposited copper metal layer being laid on dielectric-slab lower surface.
Preferably, two first microstrip lines are arranged in parallel on the upper surface of dielectric-slab and on the second center
Axis is symmetrical, and the both ends of second microstrip line are vertically connected between two first microstrip lines.
Preferably, one end of the open-circuited load and the quantity of short circuit load are four, each first microstrip line
Both ends set an open-circuited load and a short circuit load respectively.
Preferably, first microstrip line, the second microstrip line, open-circuited load, short circuit load, input, output end are
The metal copper sheet of strip structure.
Preferably, the length of first microstrip line be 46.66mm, width W1=1.22mm, second microstrip line
Length be L0=9.78mm, width W0=1.35mm, the length of the input and output end is L=14.4mm, width
Degree is W=1.66mm.
Preferably, the length of the short circuit load be L2=11mm, width W2=3mm, the length of the open-circuited load
For L3=11mm, width W3=1.7mm.
Preferably, the short circuit metallic post is shaped as column.
Compared to prior art, the double frequency band-pass filter described in the utility model based on open-circuited load and short circuit load exists
Four open-circuited loads and four short circuit loads are loaded with two microstrip lines, by the length for adjusting open-circuited load and short circuit load
Transmission zero can be formed in special frequency band with width so that the microstrip line of script has filtering performance, so as to higher
Band logical selectivity, can there is good inhibition to out of band signal, have high selectivity, introducing noise is less, avoids to penetrating
Frequency front end interferes.Double frequency band-pass filter described in the utility model is relative to existing bandpass filter, four open-circuited loads
Be connected to four short circuit loads by two first microstrip lines on conventional microstrip line, and by change microstrip line length and
Width, the double frequency band-pass filter can be made to reach good matching effect in working frequency range.
Brief description of the drawings
Fig. 1 is the surface structure signal of double frequency band-pass filter of the utility model based on open-circuited load and short circuit load
Figure；
Fig. 2 is the lower surface configuration signal of double frequency band-pass filter of the utility model based on open-circuited load and short circuit load
Figure；
Fig. 3 is that double frequency band-pass filter of the utility model based on open-circuited load and short circuit load passes through electromagnetic simulation software
The S parameter result schematic diagram of emulation.
Embodiment
The utility model is described in further detail with reference to specific embodiment, following examples are to this practicality
New explanation, the utility model are not limited to following examples.
With reference to shown in figure 1, Fig. 1 is the upper of double frequency band-pass filter of the utility model based on open-circuited load and short circuit load
Surface texture schematic diagram.In the present embodiment, the double frequency band-pass filter based on open-circuited load and short circuit load includes being situated between
Scutum 1, etching the upper surface of dielectric-slab 1 two first microstrip lines 10, input P1, output end P2 and the second microstrip line 11,
And it is arranged on the ground metal layer 14 of dielectric-slab lower surface (with reference to figure 2).The both ends of each first microstrip line 10 are set respectively
Open-circuited load 12 and short circuit load 13 are equipped with, the middle part of two first microstrip lines 10 is connected by the second microstrip line 11, input
End P1 one end is disposed therein the middle part of first microstrip line 10 and the input P1 other end extends to the one of dielectric-slab 1
The long edge of bar, output end P2 one end is disposed therein the middle part of another first microstrip line 10 and the output end P2 other end prolongs
Extend another long edge of pcb board 2.The end of each short circuit load 13 is provided with short circuit metallic post 130, the short circuit gold
The shape for belonging to post 130 can be column, such as cylinder or strip cylindricality.The dielectric-slab 1 is a kind of pcb board, specific plate
Material type is Roger RO4350B, wherein relative dielectric constant 3.66, thickness of slab 0.762mm.
The both ends of second microstrip line 11 connect with input P1, output end P2 and are located at same horizontal line ab respectively
On, the present embodiment is used as the first central axis ab using horizontal line ab.It is described in the utility model to be based on open-circuited load and short circuit load
Double frequency band-pass filter it is symmetrical above and below on the first central axis ab and symmetrical on the second central axis cd, first
Central axis ab is mutually perpendicular to the second central axis cd.Two first microstrip lines 10 are arranged in parallel in the upper of dielectric-slab 1
Surface and symmetrical on the second central axis cd, the second microstrip line 11 is mutually connected vertically with two first microstrip lines 10.Open circuit
Load 12 one end and short circuit load 13 one end with any angle of intersection be arranged on each first microstrip line 10 both ends and
It is interconnected.In the present embodiment, one end of the open-circuited load 12 and one end of short circuit load 13 are with mutually orthogonal angle
It is arranged on the both ends of each first microstrip line 10 and is interconnected.
It should be noted that the long edge that this implementation defines dielectric-slab 1 refers to the medium parallel with the second central axis cd
Two edges of plate 1.Interval is separated between two first microstrip lines 10, the spacing distance is equal to the length of the second microstrip line 11.
When one end of open-circuited load 12 and one end of short circuit load 13 are connected to the both ends of the first microstrip line 10 in mutually perpendicular manner,
The distance between open-circuited load 12 and short circuit load 13 are less than the spacing distance between two first microstrip lines 10.Due to two
The both ends of one microstrip line 10 are provided with an open-circuited load 12 and a short circuit load 13, therefore double frequency described in the utility model
Bandpass filter has four open-circuited loads 12 and four short circuit loads 13.Four open-circuited loads 12 and four short circuit loads 13 make
Obtain double frequency band-pass filter described in the utility model and possess two stopbands in any working frequency range, so that the utility model
The double frequency band-pass filter has dual frequency characteristics, has higher band logical selectivity.
In the present embodiment, the first microstrip line 10, the second microstrip line 11, open-circuited load 12, short circuit load 13, input
P1, output end P2 are the metal copper sheet of strip structure.Double frequency described in the utility model based on open-circuited load and short circuit load
Bandpass filter passes through two first micro-strips relative to existing bandpass filter, four open-circuited loads 12 and four short circuit loads 13
Line 12 is connected on the second microstrip line 11, and by changing the length and width of microstrip line, can be made described in the utility model
Double frequency band-pass filter based on open-circuited load and short circuit load reaches good matching effect in working frequency range.
The utility model is realized with working band in 2.61GHz to 3.23GHz and in 4.75GHz to 5.02GHz
Exemplified by dual frequency characteristics, by the first microstrip line 10, the second microstrip line that the upper surface of dielectric-slab 1 is arranged on for specific embodiment
11st, open-circuited load 12, short circuit load 13, input P1, output end P2 length and width.In the present embodiment, the first micro-strip
The length of line 10 is 22.5mm+1.66mm=46.66mm, and the width of the first microstrip line 10 is W1=1.22mm.Second microstrip line
11 length is L0=9.78mm, and the width of the second microstrip line 11 is W0=1.35mm.The input P1's and output end P2
Length is that L=14.4mm, input P1 and output end P2 width are W=1.66mm.The length of the open-circuited load 12
For L3=11mm, the width of open-circuited load 12 is W3=1.7mm；The length of short circuit load 13 is L2=11mm, short circuit load 13
Width be W2=3mm.It should be noted that the metal copper thickness being arranged on pcb board is generally um levels, therefore this practicality
It is new not to the first microstrip line 10, second microstrip line 11, open-circuited load 12, short circuit load 13, input P1, output end P2
Metal copper thickness is any limitation as, and is had no effect on described in the utility model based on the filter of the double frequency band-pass of open-circuited load and short circuit load
The characteristic of ripple device.
With reference to shown in figure 2, Fig. 2 is under double frequency band-pass filter of the utility model based on open-circuited load and short circuit load
Surface texture schematic diagram.In the present embodiment, the short circuit metallic post 130 of each end of short circuit load 13 is from the upper of dielectric-slab 1
Surface is penetrated to the lower surface of dielectric-slab 1, and is connected to the ground metal layer 14 of the lower surface of dielectric-slab 1, the ground metal layer
14 be the deposited copper metal layer of the lower surface of dielectric-slab 1 of being laid in.
Double frequency band-pass filter described in the utility model based on open-circuited load and short circuit load is set by said structure
Meter, by being loaded with four open-circuited loads 12 and four short circuit loads 13 on conventional microstrip line, by adjusting open-circuited load 12
Transmission zero can be formed with the length and width of short circuit load 13 in particular job frequency band so that the microstrip line of script has filter
Ripple performance, there can be good inhibition to out of band signal, there is high selectivity to passband signal, introduce less noise, keep away
Exempt to interfere radio-frequency front-end.
With reference to shown in figure 3, Fig. 3 is that double frequency band-pass filter of the utility model based on open-circuited load and short circuit load passes through
The S parameter result schematic diagram of electromagnetic simulation software emulation.Usually, usually, bandpass filter allows different frequency bands signal to enter
Enter system, filter out out of band signal or noise.From figure 3, it can be seen that arrived in 2.61GHz to 3.23GHz and in 4.75GHz
In 5.02GHz, the reflectance factor of the double frequency band-pass filter described in the utility model based on open-circuited load and short circuit load (|
S11 |) below -10dB, illustrate the double frequency band-pass filter can be operated in 2.61GHz to 3.23GHz and
In 4.75GHz to 5.02GHz, therefore dual frequency characteristics can be realized.At 2.13GHz, double frequency band-pass filtering described in the utility model
The transmission characteristic (| S21 |) of device can reach -35.8dB, at 4.13GHz, | S21 | -50.6dB is can reach, at 5.27GHz, |
S21 | -34dB is can reach, so double frequency band-pass filter described in the utility model has high selectivity.It follows that this practicality
The new double frequency band-pass filter based on open-circuited load and short circuit load can have good inhibition to out of band signal, right
Passband signal has high selectivity, introduces less noise, avoids interfering radio-frequency front-end, therefore can greatly improve microwave electricity
The performance on road.
Double frequency band-pass filter described in the utility model based on open-circuited load and short circuit load adds on two microstrip lines
Four open-circuited loads 12 and four short circuit loads 13 are carried, by the length and width for adjusting open-circuited load 12 and short circuit load 13
Transmission zero can be formed in special frequency band so that the microstrip line of script has filtering performance, so as to be selected with higher band logical
Selecting property.Double frequency band-pass filter described in the utility model is relative to existing bandpass filter, by four open-circuited loads 12 and four
Short circuit load 13 is connected on conventional microstrip line by two first microstrip lines 12, and by changing the length and width of microstrip line
Degree, can make double frequency band-pass filter described in the utility model reach good matching effect in working frequency range.
Preferred embodiment of the present utility model is these are only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (8)
1. a kind of double frequency band-pass filter based on open-circuited load and short circuit load, including dielectric-slab, etching are in dielectric-slab upper table
Two first microstrip lines, input, output end and second microstrip line in face and the ground metal for being arranged on dielectric-slab lower surface
Layer, it is characterised in that the double frequency band-pass filter is symmetrical above and below on the first central axis and left on the second central axis
It is right symmetrical, wherein：
The both ends of each first microstrip line are respectively arranged with open-circuited load and short circuit load, the middle part of two first microstrip lines
Connected by the second microstrip line；
One end of the open-circuited load and one end of short circuit load are arranged on first microstrip line with mutually orthogonal angle
Both ends and be interconnected；
One end of the input is disposed therein the middle part of first microstrip line and the other end of the input extends to Jie
One long edge of scutum；
One end of the output end is disposed therein the middle part of another first microstrip line and the other end of the output end extends to
Another long edge of dielectric-slab；
The both ends of second microstrip line connect with input, output end and in same horizontal lines respectively, and the horizontal line is made
For the first central axis, the second central axis is mutually perpendicular to the first central axis；
The end of the short circuit load is provided with short circuit metallic post, and the short circuit metallic post is penetrated to Jie from the upper surface of dielectric-slab
The lower surface of scutum, and the ground metal layer with being arranged on dielectric-slab lower surface is connected.
2. the double frequency band-pass filter according to claim 1 based on open-circuited load and short circuit load, it is characterised in that institute
It is the deposited copper metal layer being laid on dielectric-slab lower surface to state ground metal layer.
3. the double frequency band-pass filter according to claim 1 based on open-circuited load and short circuit load, it is characterised in that institute
It is arranged in parallel on the upper surface of dielectric-slab and symmetrical on the second central axis to state two first microstrip lines, it is described
The both ends of second microstrip line are vertically connected between two first microstrip lines.
4. the double frequency band-pass filter according to claim 1 based on open-circuited load and short circuit load, it is characterised in that institute
It is four to state one end of open-circuited load and the quantity of short circuit load, and the both ends of each first microstrip line set one to open respectively
Road loads and a short circuit load.
5. the double frequency band-pass filter according to claim 1 based on open-circuited load and short circuit load, it is characterised in that institute
State the first microstrip line, the second microstrip line, open-circuited load, short circuit load, input, output end be strip structure metallic copper
Piece.
6. the double frequency band-pass filter according to claim 5 based on open-circuited load and short circuit load, it is characterised in that institute
The length for stating the first microstrip line is 46.66mm, width W1=1.22mm, and the length of second microstrip line is L0=
The length of 9.78mm, width W0=1.35mm, the input and output end is that L=14.4mm, width are W=
1.66mm。
7. the double frequency band-pass filter according to claim 6 based on open-circuited load and short circuit load, it is characterised in that institute
The length for stating short circuit load is L2=11mm, width W2=3mm, and the length of the open-circuited load is L3=11mm, width is
W3=1.7mm.
8. the double frequency band-pass filter according to claim 1 based on open-circuited load and short circuit load, it is characterised in that institute
That states short circuit metallic post is shaped as column.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265249.4U CN206673067U (en) | 2017-03-18 | 2017-03-18 | Double frequency band-pass filter based on open-circuited load and short circuit load |
| PCT/CN2017/111487 WO2018171231A1 (en) | 2017-03-18 | 2017-11-17 | Dual-band band-pass filter based on open loads and short-circuit loads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265249.4U CN206673067U (en) | 2017-03-18 | 2017-03-18 | Double frequency band-pass filter based on open-circuited load and short circuit load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206673067U true CN206673067U (en) | 2017-11-24 |
Family
ID=60377948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720265249.4U Expired - Fee Related CN206673067U (en) | 2017-03-18 | 2017-03-18 | Double frequency band-pass filter based on open-circuited load and short circuit load |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206673067U (en) |
| WO (1) | WO2018171231A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921012A (en) * | 2017-03-18 | 2017-07-04 | 深圳市景程信息科技有限公司 | High selectivity double frequency band-pass filter |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728394B (en) * | 2018-12-08 | 2023-08-04 | 广东盛路通信科技股份有限公司 | Microstrip combiner with power distribution function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202308232U (en) * | 2011-10-21 | 2012-07-04 | 南京航空航天大学 | Microwave filter with double frequency bands |
| CN203351718U (en) * | 2013-06-20 | 2013-12-18 | 南京航空航天大学 | Stepped impedance comb line balance microstrip band pass filter characterized by high selectivity and high common mode rejection |
| CN205752465U (en) * | 2016-06-22 | 2016-11-30 | 东北大学 | Based on parallel coupled line and the difference filter of open circuit minor matters |
| CN106921012B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Highly selective double frequency band-pass filter |
-
2017
- 2017-03-18 CN CN201720265249.4U patent/CN206673067U/en not_active Expired - Fee Related
- 2017-11-17 WO PCT/CN2017/111487 patent/WO2018171231A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921012A (en) * | 2017-03-18 | 2017-07-04 | 深圳市景程信息科技有限公司 | High selectivity double frequency band-pass filter |
| CN106921012B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Highly selective double frequency band-pass filter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018171231A1 (en) | 2018-09-27 |
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