CN205609712U - Miniaturized high selectivity low pass microwave filter based on coupling stub - Google Patents
Miniaturized high selectivity low pass microwave filter based on coupling stub Download PDFInfo
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- CN205609712U CN205609712U CN201620152848.0U CN201620152848U CN205609712U CN 205609712 U CN205609712 U CN 205609712U CN 201620152848 U CN201620152848 U CN 201620152848U CN 205609712 U CN205609712 U CN 205609712U
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- transmission line
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Abstract
The utility model discloses a miniaturized high selectivity low pass microwave filter based on coupling stub, including ground plate, dielectric layer and top layer, be provided with go back to type defect ground that constitutes by interior ring sum outer loop on the ground plate, be provided with the opening on the interior ring sum outer loop respectively, the both sides of going back to type defect ground are provided with C type defect ground respectively symmetrically, the middle part of top layer is equipped with the transmission line, the upper and lower both sides of transmission line are symmetrical two L type transmission lines that are connected with the intercoordination respectively. This wave filter utilizes the coupling between the step impedance L type transmission line, has realized the stop band of broad, utilizes the ground plate of taking C type defect ground structure to improve low pass filter's selectivity simultaneously, the utility model discloses the wave filter has reduced the design size of original wave filter, has improved the selectivity of wave filter, has realized the low pass filter of wide stop band.
Description
Technical field
This utility model relates to a kind of low pass microwave filter, particularly relates to a kind of based on coupling stub little
Type height selectivity low pass microwave filter.
Background technology
Microwave communication techniques was flourish in recent years, day by day increased the demand of microwave device.Microwave filter is made
For the most crucial microwave device, major function is that the signal to different frequency filters, and obtains fixed frequency
Signal, filter unwanted signal.Its performance directly affects the performance indications of whole system.Therefore, as
How to improve the characteristic of the selection of wave filter, and the size reducing them becomes the focus of research now.
Low pass filter is one of important composition of wave filter, for filtering the signal of high band, obtains required
Low-band signal.Along with the development of wireless system, low pass filter is gradually towards high-performance, small size, easily
The direction of processing integrated, easy is developed.Research worker has done a lot of effort for this, but meets these requirements simultaneously
Still there is certain difficulty.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, it is provided that a kind of based on coupling stub
Miniaturization height selectivity low pass microwave filter, utilize the coupling between Stepped Impedance L-type transmission line,
Achieve wider stopband, utilize the earth plate of band c-type defect ground structure to improve low pass filter simultaneously
Selectivity；This utility model wave filter reduces the design size of original wave filter, improves the selection of wave filter
Property, it is achieved that the low-pass filtering of Wide stop bands.
The purpose of this utility model is achieved through the following technical solutions:
A kind of miniaturization height selectivity low pass microwave filter based on coupling stub, including earth plate, medium
Layer and top layer, described earth plate is provided with the hollow defect ground being made up of internal ring and outer shroud, and described internal ring is with outer
Being respectively arranged with opening on ring, the both sides on described hollow defect ground are provided with c-type defect ground the most relatively symmetrically,
The middle part of described top layer is provided with transmission line, and the connection that the both sides up and down of described transmission line are the most symmetrical has phase mutual coupling
Two the L-type transmission lines closed.
Described L-type transmission line has identical symmetrical centre with described c-type defect ground.
The length of described L-type transmission line vertical section and wide 1.6mm and 0.1mm, L-type transmission line traversing section respectively
Length and wide be respectively 3.5mm and 1.4mm.
The width on described c-type defect ground is 0.07-0.13mm.
Compared with prior art, the technical solution of the utility model is had the benefit that
1. the connection that on top layer, the both sides up and down of transmission line are the most symmetrical has two the L-type transmission intercoupled
Line, the mode that this Stepped Impedance L-type transmission line is coupled, make single transmission zero be split into two transmission
Zero point, it is thus achieved that wider stopband；The both sides on hollow defect ground are provided with c-type defect ground the most relatively symmetrically,
This set improve low pass filter selective simultaneously, reduce passband ripple, hence it is evident that improve wave filter
Performance.
2. achieving high selective low pass filter, this utility model low pass filter has good selectivity,
Wider stopband and the performance such as pass band damping is little, efficiently solve conventional lowpass filter manufactured size big, become
This high defect.By changing c-type defect ground and the size of L-type transmission line of this utility model wave filter,
The cut-off frequency of wave filter can be adjusted, the high-performance low pass microwave filter meeting different demands can be obtained.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model earth plate.
Fig. 2 is the structural representation of this utility model top layer.
Defect ground and the position relationship schematic diagram of transmission line in top layer in Fig. 3 this utility model earth plate.
Fig. 4 is the transmission characteristic schematic diagram of this utility model wave filter.
Reference: 4-C type defect ground, 1-earth plate 2-top layer 3-hollow defect ground 5-transmission line 2a-L type
Transmission line 2b-L type transmission line 2c-L type transmission line 2d-L type transmission line
Detailed description of the invention
The utility model will be further described below in conjunction with the accompanying drawings:
As shown in Figure 1 to Figure 3, a kind of miniaturization height selectivity low pass microwave filter based on coupling stub,
Including earth plate 1 and top layer 2, the middle part of earth plate 1 and top layer 2 is provided with dielectric layer, and earth plate 1 is arranged
Having the hollow defect ground 3 being made up of internal ring and outer shroud, the both sides on hollow defect ground 3 are provided with the most relatively symmetrically
C-type defect ground 4, the middle part of top layer 2 is provided with uniform transmission line 5, the both sides up and down of transmission line 5 phase respectively
Symmetrical connection has intercouple two L-type transmission lines: wherein the upside of transmission line 5 connects phase mutual coupling
The L-type transmission line 2a closed and L-type transmission line 2b, the downside of transmission line 5 connects relatively symmetrically and intercouples
L-type transmission line 2c and L-type transmission line 2d.
So-called Stepped Impedance, is the transmission of transmission line combination by two or more different characteristic impedances
Line, single Stepped Impedance L-type transmission line can form transmission zero, produce obvious band-stop response；But
The stopband that this structure produces is narrower, and we use the mode that Stepped Impedance L-type transmission line is coupled, and make single
Transmission zero is split into two transmission zeros, it is thus achieved that wider stopband.This utility model is at uniform transmission line
The coupling Stepped Impedance L-type transmission line structure loaded on the basis of 5, as in figure 2 it is shown, Stepped Impedance L-type passes
Defeated line is 2a, 2b, 2c and the 2d in Fig. 2, wherein 2a and 2b coupling, 2c and 2d couples.
So-called defect ground, is to remove a part on complete ground electrode and defect sturcture on the ground electrode that formed.
The present embodiment itself has in earth plate 1 hollow shortcoming ground structure 3, hollow defect ground 3 internal ring and outer shroud structure
Becoming, internal ring and outer shroud are provided with opening at not homonymy respectively and form complementary structure, in order to improve low pass filter
Selectivity, on earth plate 1, the both sides on hollow defect ground 3 have added c-type defect ground 4 structures relatively symmetrically,
As shown in Figure 1.This c-type defect ground 4 structures improve low pass filter selective simultaneously, reduce
Passband ripple, hence it is evident that improve the performance of this wave filter.
Fig. 3 be with loading coupling L-type transmission line and c-type defect with the position of structure that combines, hollow defect ground
Put relation schematic diagram, in this structure, c-type defect ground 4 and hollow defect ground 3 in the bottom surface of pcb board,
L-type transmission line 2a, 2b, 2c and 2d are all at the end face of pcb board.
The transmission characteristic of this utility model low pass filter as shown in Figure 4, it can be seen that low-pass filtering
Device is near 3.4GHz, it is achieved that precipitous decay.
Optimal, L-type transmission line 2a, 2b, 2c and 2d of loading is in hollow defect ground 3 and c-type defect
The surface on ground 4, has identical symmetrical centre.
Optimal, in this example, the medium substrate of dielectric layer selects dielectric constant to be 2.2, and tangent angle loss is
0.0009, thickness is the Rogers RT/duroid 5880 of 0.508mm.
Optimal, for making the using effect optimization of this utility model wave filter, concrete size is as follows:
The width of uniform transmission line 5 is 1.1mm, a length of 8.1mm；L-type transmission line 2a, 2b, 2c
With the vertical section of 2d as high resistance portion, its width is 0.1mm, a length of 1.6mm；L-type transmission line 2a,
The traversing section of 2b, 2c and 2d is as low resistance portions, and its width is 1.4mm, a length of 3.5mm.Hollow lacks
The internal ring length and width falling into ground 3 are respectively 4mm and 3mm, and outer shroud length and width are respectively 4.4mm and 3.4mm, interior
Ring and the groove width of outer shroud and A/F are 0.1mm.The width on c-type defect ground 4 is 0.1mm, and long end is
3.6mm, short end is 0.1mm.
In sum, low pass filter of the present utility model is by loading coupling Stepped Impedance L-type transmission line
With c-type defect with the structure that combines of hollow defect ground, realize low-pass characteristic.By this cutting back
The wider stopband that the coupling of line realizes, it is possible to the volume being substantially reduced wave filter reduces, c-type defect simultaneously
Ground and hollow defect the structure that combines effectively improve the pass-band performance of wave filter.
Although the foregoing describing detailed description of the invention of the present utility model, but these being merely illustrative of, this practicality
Novel protected scope is defined by the appended claims.Those skilled in the art are without departing substantially from of the present utility model former
On the premise of reason and essence, these embodiments can be made amendment or change, but these modifications and changes are all
Fall into protection domain of the present utility model.
Claims (4)
1. a miniaturization height selectivity low pass microwave filter based on coupling stub, including earth plate, Jie
Matter layer and top layer, described earth plate is provided with the hollow defect ground being made up of internal ring and outer shroud, it is characterised in that
Being respectively arranged with opening on described internal ring and outer shroud, the both sides on described hollow defect ground are provided with the most relatively symmetrically
C-type defect ground, the middle part of described top layer is provided with transmission line, and the both sides up and down of described transmission line are the most symmetrical
Connect and have two the L-type transmission lines intercoupled.
A kind of miniaturization height selectivity low pass microwave based on coupling stub the most according to claim 1 is filtered
Ripple device, it is characterised in that described L-type transmission line is positioned at the surface on described c-type defect ground, described L-type
Transmission line has identical symmetrical centre with described c-type defect ground.
A kind of miniaturization height selectivity low pass based on coupling stub the most according to claim 1 and 2 is micro-
Wave filter, it is characterised in that the length of described L-type transmission line vertical section and wide 1.6mm and 0.1mm respectively,
The length of L-type transmission line traversing section and wide respectively 3.5mm and 1.4mm.
A kind of miniaturization height selectivity low pass microwave based on coupling stub the most according to claim 1 is filtered
Ripple device, it is characterised in that the width on described c-type defect ground is 0.07-0.13mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620152848.0U CN205609712U (en) | 2016-02-29 | 2016-02-29 | Miniaturized high selectivity low pass microwave filter based on coupling stub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620152848.0U CN205609712U (en) | 2016-02-29 | 2016-02-29 | Miniaturized high selectivity low pass microwave filter based on coupling stub |
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| Publication Number | Publication Date |
|---|---|
| CN205609712U true CN205609712U (en) | 2016-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620152848.0U Expired - Fee Related CN205609712U (en) | 2016-02-29 | 2016-02-29 | Miniaturized high selectivity low pass microwave filter based on coupling stub |
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| CN (1) | CN205609712U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609907A (en) * | 2016-02-29 | 2016-05-25 | 天津大学 | Coupled stub line based miniaturized high-selectivity low-pass microwave filter |
-
2016
- 2016-02-29 CN CN201620152848.0U patent/CN205609712U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609907A (en) * | 2016-02-29 | 2016-05-25 | 天津大学 | Coupled stub line based miniaturized high-selectivity low-pass microwave filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160928 Termination date: 20170229 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |