CN206059606U - Coupled microstrips arrangements and wave filter - Google Patents
Coupled microstrips arrangements and wave filter Download PDFInfo
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- CN206059606U CN206059606U CN201621030943.XU CN201621030943U CN206059606U CN 206059606 U CN206059606 U CN 206059606U CN 201621030943 U CN201621030943 U CN 201621030943U CN 206059606 U CN206059606 U CN 206059606U
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Abstract
This utility model provides a kind of coupled microstrips arrangements and wave filter, and the coupled microstrips arrangements include：The etched circuit layer (3) of medium substrate (1), the ground metal layer (2) of medium substrate (1) lower surface and medium substrate (1) upper surface, the etched circuit layer (3) includes input coupling line (4) and output coupling line (5), also including open circuit detail (6), end of open circuit detail (6) positioned at input coupling line (4).This utility model in the case of stiffness of coupling is improve, while be a kind of single-sided structure, simple structure, it is easy to processing encapsulation, can be used in closed resonator.
Description
Technical field
This utility model is related to technical field of semiconductor device, more particularly to a kind of coupled microstrips arrangements and wave filter.
Background technology
In microwave broadband wave filter, the coupling line of close coupling serves very important effect.But close coupling line is difficult
Realize on pcb board, because the minimum feature that can allow of pcb board processing technique and distance between centers of tracks are all 0.15mm.Conventional parallel coupling
Microstrip line construction is closed as shown in figure 1, including the input microstrip line and output microstrip line being parallel to each other, in order to realize close coupling, needing
Reduce micro belt line width W1、W2And interval S, but the minimum feature that can realize of traditional PCB technique and distance between centers of tracks are 0.15mm.
In order to strengthen the coupling between coupling line, scientists propose many methods and new structure.Tool is defectively tied
The parallel coupled line of structure (DGS) is proposed (Multilayered coupled-microstrip lines by Lei Zhu et al.
Technique with aperture compensation for innovative planar filter design), from
And strengthen the coupling between coupling line.Based on this DGS technologies, Cheng-Hsien Liang et al. by two signal line layouts
(the Enhanced Coupling Structures for Tight Couplers and Wideband in defect ground
Filters), further increase stiffness of coupling.Additionally, (Dual-Band Microstrip Bandpass Filter
Using Stepped-Impedance Resonators With New Coupling Schemes) in input coupling line divided
The structures for referring to are inserted into two, output coupling line is inserted positioned at two inputs between referring to, due to a total of three coupling lines of the structure, from
And strengthen coupling.
During this utility model is realized, at least there is following technical problem in finding prior art in inventor：DGS
Technology is unable to dead ground due to ground level, needs a kind of special encapsulation, so as to increased manufacture difficulty.Insert the knot for referring to coupling
Structure cannot be used in the case where the resonator of wave filter is for closing, cannot be used such as in open-loop resonator, in ring resonator.
Utility model content
A kind of coupled microstrips arrangements and wave filter that this utility model is provided, in the case of stiffness of coupling is improve, together
When be a kind of single-sided structure, simple structure, it is easy to processing encapsulation, can be used in closed resonator.
This utility model provides a kind of coupled microstrips arrangements, and the coupled microstrips arrangements include：Medium substrate (1), medium
The etched circuit layer (3) of the ground metal layer (2) and medium substrate (1) upper surface of substrate (1) lower surface, the etched circuit layer
(3) including input coupling line (4) and output coupling line (5), also including open circuit detail (6), open circuit detail (6) is located at
The end of input coupling line (4).
Alternatively, the length of open circuit detail (6) isWherein λgFor the waveguide ripple of operating center frequency
It is long, LCFor the length of output coupling line.
Alternatively, open circuit detail (6) is arbitrarily optional with the angle between the input coupling line (4).
This utility model also provides a kind of wave filter, and the wave filter includes coupled microstrips arrangements described above.
Coupled microstrips arrangements and wave filter that this utility model embodiment is provided, by arranging in the end of input coupling line
Strengthening the intensity of input coupling line and output coupling line, the coupled microstrips arrangements of formation are planar structure to open circuit detail, structure
Simply, it is easy to processing encapsulation, while can be used in closed resonator.
Description of the drawings
Fig. 1 is existing parallel coupling microstrip structure schematic diagram；
The coupled microstrips arrangements schematic diagram that Fig. 2 is provided for this utility model；
The structural representation of the wave filter that Fig. 3 is provided for this utility model；
Wave filter return loss and the graph of a relation opened a way between detail length that Fig. 4 is provided for this utility model；
The emulation of the band filter that Fig. 5 this utility model is provided and test result.
Specific embodiment
It is to make purpose, technical scheme and the advantage of this utility model embodiment clearer, new below in conjunction with this practicality
Accompanying drawing in type embodiment, is clearly and completely described to the technical scheme in this utility model embodiment, it is clear that retouched
The embodiment stated is only a part of embodiment of this utility model, rather than the embodiment of whole.Based in this utility model
Embodiment, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art, all
Belong to the scope of this utility model protection.
This utility model provides a kind of coupled microstrips arrangements, as shown in Fig. 2 the coupled microstrips arrangements include：Medium base
The etched circuit layer 3 of plate 1,1 upper surface of the ground metal layer 2 of 1 lower surface of medium substrate and medium substrate, the etched circuit layer
3 include input coupling line 4 and output coupling line 5, and also including an open circuit detail 6, the open circuit detail 6 is located at input coupling line
4 end.
The coupled microstrips arrangements that this utility model embodiment is provided, by arranging open circuit detail in the end of input coupling line
To strengthen the intensity of input coupling line and output coupling line, the coupled microstrips arrangements of formation are planar structure, simple structure, it is easy to
Processing encapsulation, while can be used in closed resonator.
Alternatively, the length of the open circuit detail 6 isWherein λgFor the waveguide ripple of operating center frequency
It is long, LCFor the length of output coupling line.
Alternatively, the angle between the open circuit detail 6 and the input coupling line 4 is arbitrarily optional.
This utility model is not changing traditional coupling microstrip line width W1、W2On the premise of interval S, in input coupling line 4
End added one open circuit detail 6.Length L for adjusting open circuit detail can change the electric current on input coupling line 4.Work as open circuit
Detail lengthWhen, stiffness of coupling is maximum, wherein λgFor the waveguide wavelength of operating center frequency, LCFor output coupling
The length of line.
Using this utility model, it is first determined application scenario (device such as wave filter or bonder) of the present utility model, work
The mid frequency f of workCAnd required stiffness of coupling size.Secondly pcb board material is selected, the relative dielectric constant and thickness of sheet material is specified
Degree.According to the demand of the occasion applied, the width W of output coupling line is determined2With length LC, choose input coupling as little as possible
Zygonema width W1And interval S, adjust open circuit detail length L make stiffness of coupling of the present utility model reach needed for intensity, from
And improve the performance of device.
The specific embodiment of the coupled structure that Fig. 3 is provided for this utility model, the coupled structure are applied to bandpass filtering
In device, as the input coupling structure and output coupling structure of wave filter.Used medium substrate be Rogers RO4350, its phase
It is 3.5 to dielectric constant, thickness is 0.762mm.Bandpass filter centre frequency fC=3.6GHz, with a width of 10%.Output coupling
A side of the zygonema for the square resonator of wave filter, width are set to W according to the requirement of resonator2=1.66mm, length LC=
7.84mm.The width of input coupling line exhausts value that may be little, takes W1=0.2mm, manager's opinion calculate required input and output coupling
Close intensity and be about 0.07, adjustment coupling line open circuit detail causes L=4.1mm, the stiffness of coupling needed for making up to.Optimization is obtained
Final size shown in Fig. 3, wherein W1=0.2mm, S=0.15mm, S1=0.2mm, S2=0.32mm, g=0.5mm, a=
5mm, R=0.1mm.Fig. 4 be when coupling open circuit detail length change when, the insertion loss of wave filter, return loss variation diagram.Its
Middle S21For insertion loss parameter, S11For return wave loss parameter.It can be seen that when length L is 0, i.e., traditional coupled structure, wave filter
Return loss is less than 5dB.When L is changed intoWhen, wave filter return loss reaches 15dB.When L continues to increase, wave filter
Return loss starts to diminish again.Fig. 5 is the emulation of band filter in this utility model embodiment and test result, it is seen that actual measurement
Wave filter return loss match well with design load.Demonstrate the feasibility of the coupled structure.
This utility model also provides a kind of wave filter, and the wave filter includes coupled microstrips arrangements described above.
The coupled structure that this utility model is provided can be applicable to, in the various microwave devices for needing close coupling, be particularly well-suited to
The input and output coupling of broadband filter.Can be printed directly on frequency PCB plate.The live width of actual coupled structure, line length are with institute
Using occasion, mid frequency fCAnd pcb board material is different and different.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any those familiar with the art in the technical scope that this utility model is disclosed, the change that can be readily occurred in
Change or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with power
The protection domain that profit is required is defined.
Claims (4)
1. a kind of coupled microstrips arrangements, it is characterised in that include：The ground connection gold of medium substrate (1), medium substrate (1) lower surface
The etched circuit layer (3) of category layer (2) and medium substrate (1) upper surface, the etched circuit layer (3) is including input coupling line (4)
With output coupling line (5), also including open circuit detail (6), end of open circuit detail (6) positioned at input coupling line (4).
2. coupled microstrips arrangements according to claim 1, it is characterised in that the length of the open circuit detail (6) isWherein λgFor the waveguide wavelength of operating center frequency, LCFor the length of output coupling line.
3. coupled microstrips arrangements according to claim 2, it is characterised in that the open circuit detail (6) and the input coupling
Angle between zygonema (4) is arbitrarily optional.
4. a kind of wave filter, it is characterised in that the wave filter includes the coupling microstrip knot any one of claim 1-3
Structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621030943.XU CN206059606U (en) | 2016-08-31 | 2016-08-31 | Coupled microstrips arrangements and wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621030943.XU CN206059606U (en) | 2016-08-31 | 2016-08-31 | Coupled microstrips arrangements and wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206059606U true CN206059606U (en) | 2017-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621030943.XU Active CN206059606U (en) | 2016-08-31 | 2016-08-31 | Coupled microstrips arrangements and wave filter |
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| CN (1) | CN206059606U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204241A (en) * | 2021-12-07 | 2022-03-18 | 杭州电子科技大学 | Microstrip-open slot line coupled dual-band 90-degree directional coupler |
-
2016
- 2016-08-31 CN CN201621030943.XU patent/CN206059606U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204241A (en) * | 2021-12-07 | 2022-03-18 | 杭州电子科技大学 | Microstrip-open slot line coupled dual-band 90-degree directional coupler |
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