CN209515948U - The interdigital microstrip filter of multilayer folding - Google Patents
The interdigital microstrip filter of multilayer folding Download PDFInfo
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- CN209515948U CN209515948U CN201920005097.3U CN201920005097U CN209515948U CN 209515948 U CN209515948 U CN 209515948U CN 201920005097 U CN201920005097 U CN 201920005097U CN 209515948 U CN209515948 U CN 209515948U
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- microstrip filter
- multilayer folding
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Abstract
The utility model relates to wireless communication field, the in particular to interdigital microstrip filter of multilayer folding, including clamped by upper earth plate and lower earth plate in intermediate filter main body；Filter main body includes two resonator layers of medium substrate and upper and lower two sides, and each resonator layer is provided at least a pair of of resonator, and a pair of of resonator is symmetrical arranged by two resonators and is formed, and resonator is U-shaped；It is located at the short at one end in outside on resonator, the other end positioned inside is opened a way；Input/output port is located in one of on resonant layer, and input port is connect with the resonator close to the resonator layer left side edge, and output port is connect with the resonator close to the resonator layer right edge.The interdigital microstrip filter of this multilayer folding significantly improves stop band attenuation by cross-coupling, has size small, keeps its stopband attenuation big, overall performance is significantly better than traditional interdigital microstrip filter, is with a wide range of applications.
Description
Technical field
The utility model relates to wireless communication fields, the in particular to interdigital microstrip filter of multilayer folding.
Background technique
Filter is a kind of common wireless communication devices, and main function is to filter out garbage signal by useful signal.It is micro-
Band filter is a kind of common filter form, primary structure parallel coupling form, hairpin formation, open loop form, pectination
Line and interdigital structure form etc., microstrip filter have small in size, the benefits such as easy processing realization.
Fig. 1 show the interdigital microstripline filter schematic diagram of quadravalence.Left and right ends are input/output port, and centre is four
Resonant element, length are about the quarter-wave of filter working frequency.This resonant element short at one end, one end open circuit, etc.
Effect is a LC antiresonant circuit.Gap between resonant element is equivalent to capacitor, carries out electromagnetic coupling to each other.Input/output terminal
Using tap form, it is equivalent to transformer, carries out electromagnetic wave coupling.
The working principle of filter: when signal is equal to working frequency, circuit resonance, each branch reactance is very big, and signal is big
Part is exported by main road；Conversely, due to circuit not resonance, each branch reactance is smaller, signal when signal deviates working frequency
Most of to be decayed by branch, small part signal leads to main road output.
Present interdigital microstrip filter is a kind of common structure form, but size is larger, and the decaying of stopband is limited.
Utility model content
The purpose of this utility model is to provide a kind of interdigital microstrip filters of better multilayer folding of stopband attenuation performance.
To achieve the goals above, the utility model provides the interdigital microstrip filter of multilayer folding, including by upper ground connection
Plate and lower earth plate are clamped in intermediate filter main body；
Filter main body include a medium substrate and be separately positioned on medium substrate up and down two sides two resonator layers,
Each resonator layer is provided at least a pair of of resonator, and a pair of of resonator is symmetrical arranged by two resonators and is formed, above-mentioned resonance
Device is U-shaped；
The both ends of resonator on the upside of medium substrate are located on the downside of medium substrate towards the front side of place resonator layer
Resonator both ends towards place resonator layer rear side；It is located at the short at one end in outside on above-mentioned resonator, is located inside
The other end open circuit；Input/output port is located in one of on resonant layer, input port and the close resonator layer left side
The resonator on edge connects, and output port is connect with the resonator close to the resonator layer right edge.
The interdigital microstrip filter of this multilayer folding significantly improves stop band attenuation, makes its resistance by cross-coupling
Band decaying is big, and overall performance is significantly better than traditional interdigital microstrip filter, is with a wide range of applications.
Further, in adjacent above-mentioned resonant layer, another is humorous by the spacing > between resonator in a resonant layer
The spacing between resonator shaken in layer, to improve cross-coupling effect.
Further, two or three pairs of or four pairs of resonators are provided in above-mentioned resonant layer, above and below above-mentioned medium substrate
The resonator logarithm of side is identical.
Further, the resonator flexures direction for being located at medium substrate the same side is identical.
Further, above-mentioned resonator is made of transverse part and vertical portion, vertical portion is located at transverse part two sides and forms U-shaped structure, horizontal
It is at right angles docked with vertical portion in portion.
Further, above-mentioned resonator is made of bending section and vertical portion, vertical portion is located at bending section two sides and forms U-shaped knot
Structure, bending section are arcuate structure.
The utility model is described further with reference to the accompanying drawings and detailed description.The utility model is additional
Aspect and advantage will be set forth in part in the description, and partially will become apparent from the description below.Or it is practical by this
Novel practice is recognized.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to assist understanding to the utility model, provided in attached drawing
Content and its related explanation can be used for explaining the utility model in the present invention, but is not constituted to the utility model not
Work as restriction.In the accompanying drawings:
Fig. 1 is the schematic diagram for illustrating traditional interdigital microstrip filter；
Fig. 2 is the schematic diagram for illustrating resonator layer on the upside of the interdigital microstrip filter of the multilayer folding of the present embodiment one；
Fig. 3 is the schematic diagram for illustrating resonator layer on the downside of the interdigital microstrip filter of the multilayer folding of the present embodiment one；
Fig. 4 is the decomposition diagram for illustrating the interdigital microstrip filter of multilayer folding of the present embodiment one；
Fig. 5 is the schematic diagram for illustrating resonator layer on the upside of the interdigital microstrip filter of the multilayer folding of the present embodiment two；
Fig. 6 is the schematic diagram for illustrating resonator layer on the downside of the interdigital microstrip filter of the multilayer folding of the present embodiment two；
Marked in the figure: being grounded on the first resonator of 1-, the second resonator of 2-, 3- third resonator, the 4th resonator of 4-, 5-
Earth plate, 7- medium substrate, the transverse part of 8- resonator, the vertical portion of 9- resonator, 10- input port, 11- output end under plate, 6-
Mouthful.
Specific embodiment
Clear, complete explanation is carried out to the utility model with reference to the accompanying drawing.Those of ordinary skill in the art are being based on
The utility model will be realized in the case where these explanations.Before being illustrated in conjunction with attached drawing to the utility model, spy is needed
It is not pointed out that:
The technical solution provided in each section including following the description and technical characteristic in the utility model,
In the case where not conflicting, these technical solutions and technical characteristic be can be combined with each other.
In addition, the embodiments of the present invention being related in following the description are generally only the reality of one branch of the utility model
Example is applied, instead of all the embodiments.Therefore, based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, the model of the utility model protection all should belong to
It encloses.
About term in the utility model and unit.The specification and claims of the utility model and related part
In term " includes " and its any deformation, it is intended that cover and non-exclusive include.
Such as Fig. 2-4, embodiment one:
The utility model provides the interdigital microstrip filter of multilayer folding, including folded by upper earth plate 5 and lower earth plate 6
It holds in intermediate filter main body；
Filter main body includes a medium substrate 7 and two resonators for being separately positioned on about 7 two sides of medium substrate
Layer, each resonator layer are provided with a pair of of resonator, and a pair of of resonator is symmetrical arranged by two resonators and is formed, above-mentioned resonator
For U-shaped；
The both ends of resonator on the upside of medium substrate 7 are located under medium substrate 7 towards the front side of place resonator layer
Rear side of the both ends of the resonator of side towards place resonator layer；It is located at the short at one end in outside on above-mentioned resonator, is located at interior
The other end of side is opened a way；Input/output port is located in one of on resonant layer, and input port 10 and the close resonator layer are left
The resonator on side edge connects, and output port 11 is connect with the resonator close to the resonator layer right edge.Entire filter
Main body is overlapped by three layers of printed board.The material that the medium substrate 7 uses is the common non-metallic material of substrate.
Above-mentioned resonator is made of transverse part 8 and vertical portion 9, and vertical portion 9 is located at 8 two sides of transverse part and forms U-shaped structure, transverse part 8 with indulge
Portion 9 is at right angles docked, and transverse part 8 here is also possible to arcuate structure bending section.
Particularly, above-mentioned filter main body is made of four resonators and two input and output microstrip lines.Resonator is long
For a quarter of operating frequency wavelength, one end open circuit, another terminal shortcircuit.Four resonators are bent into U-shaped.Above-mentioned resonance
Device can be divided into the first resonator 1, the second resonator 2, third resonator 3 and the 4th resonator 4, the first resonator 1 and the 4th
Resonator 4 is located at 7 upside of medium substrate, and the second resonator 2 and third resonator 3 are located at 7 downside of medium substrate.
First resonator 1 and the coupling of 2 upper layer and lower layer of the second resonator；Second resonator 2 and third resonator 3 are same
Layer, passes through slot-coupled；Third resonator 3 and the coupling of 4 upper layer and lower layer of the 4th resonator.Cross-coupling is formed in this way.
Wherein, in a pair of of resonator of same layer, the gap between two resonators influences the power of coupling, gap here
Size is adjusted according to design requirement；Particularly, the gap between the first resonator 1 and the 4th resonator 4 influences cross-coupling,
Gap between second resonator 2 and third resonator 3 influences general couple.
In the present embodiment, the gap between a pair of of resonator on the downside of the gap > between a pair of of resonator of upside,
To ensure cross-linked effect in the present embodiment.
The both ends of the above-mentioned resonator for being located at 7 upside of medium substrate are located at medium towards the front side of place resonator layer
The both ends of the resonator of 7 downside of substrate are towards the rear side of place resonator layer, i.e., the direction of a pair of of resonator of two sides is up and down
Opposite, it realizes the first resonator 1 with the 4th resonator 4 and is electrically coupled, the second resonator 2 realizes magnetic coupling with third resonator 3
It closes, in this way smoothly to realize cross-coupling.
By above-mentioned setting, make two layers of distribution of resonator body point, existing slot-coupled has Space Coupling again, above-mentioned
Resonator is equivalent to LC antiresonant circuit, passes through the shaping filter that intercouples.But this filter due to the with resonator and
There are cross-couplings for 4th resonator 4, therefore the characteristic of filter is different from traditional interdigital microstrip filter, this filter
Stopband attenuation performance is more superior, and being stacked by filter main body, compared to traditional interdigital microstrip filter,
It allows thickness to be slightly increased because being stacked on thickness, can but size be allowed to greatly reduce.Such as traditional interdigital microstrip filter list
Layer printed board thickness is 0.8mm, (upside filter layer or downside filtering one layer more than traditional interdigital microstrip filter
Device layer), thickness merely adds 0.8mm, but panel projection area can but accomplish the half of the interdigital microstrip filter of tradition, greatly
The big size for reducing filter, such as long 50mm, the wide 30mm of the interdigital microstrip filter of tradition, and this multilayer folding is used to hand over
The structure for referring to microstrip filter, can accomplish long 25mm, the size of wide 30mm, and overall performance is also more preferable.
The interdigital microstrip filter of this multilayer folding significantly improves stop band attenuation by cross-coupling, has ruler
It is very little small, meanwhile, cross-coupling is introduced, transmission zero is produced, keeps its stopband attenuation big, overall performance is significantly better than traditional
Interdigital microstrip filter, is with a wide range of applications.
Embodiment two:
Such as Figures 5 and 6, what is different from the first embodiment is that two pairs of resonators are provided in above-mentioned resonant layer, i.e., same resonator
There are four resonators in layer, and the resonator logarithm of above-mentioned 7 upper and lower sides of medium substrate is identical, positioned at the humorous of 7 the same side of medium substrate
The device bending direction that shakes is identical.The interdigital microstrip filter of the multilayer folding of the present embodiment, the characteristic on stopband attenuation are further strong
Change.
The related content of the utility model is illustrated above.Those of ordinary skill in the art are being based on these explanations
In the case where will realize the utility model.Above content based on the utility model, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, the model of the utility model protection all should belong to
It encloses.
Claims (6)
1. the interdigital microstrip filter of multilayer folding, which is characterized in that including clamped by upper earth plate (5) and lower earth plate (6)
In intermediate filter main body；
Filter main body includes a medium substrate (7) and two resonators for being separately positioned on medium substrate (7) two sides up and down
Layer, each resonator layer are provided at least a pair of of resonator, and a pair of of resonator is symmetrical arranged by two resonators and is formed, described humorous
Vibration device is U-shaped；
The both ends of resonator on the upside of medium substrate (7) are located under medium substrate (7) towards the front side of place resonator layer
Rear side of the both ends of the resonator of side towards place resonator layer；It is located at the short at one end in outside on the resonator, is located at interior
The other end of side is opened a way；Input/output port is located in one of on resonant layer, input port (10) and the close resonator layer
The resonator of left side edge connects, and output port (11) is connect with the resonator close to the resonator layer right edge.
2. the interdigital microstrip filter of multilayer folding as described in claim 1, which is characterized in that in the adjacent resonant layer, one
The spacing between the resonator in spacing > another resonant layer between resonator in a resonant layer.
3. the interdigital microstrip filter of multilayer folding as described in claim 1, which is characterized in that be provided with two in the resonant layer
Pair or three pairs or four pairs of resonators, the resonator logarithm of medium substrate (7) upper and lower sides it is identical.
4. the interdigital microstrip filter of multilayer folding as claimed in claim 3, which is characterized in that it is same to be located at medium substrate (7)
The resonator flexures direction of side is identical.
5. the interdigital microstrip filter of multilayer folding as described in claim 1, which is characterized in that the resonator is by transverse part (8)
It is formed with vertical portion, vertical portion is located at transverse part (8) two sides and forms U-shaped structure, and transverse part (8) is at right angles docked with vertical portion.
6. the interdigital microstrip filter of multilayer folding as described in claim 1, which is characterized in that the resonator by bending section and
Vertical portion's composition, vertical portion are located at bending section two sides and form U-shaped structure, and bending section is arcuate structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920005097.3U CN209515948U (en) | 2019-01-02 | 2019-01-02 | The interdigital microstrip filter of multilayer folding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920005097.3U CN209515948U (en) | 2019-01-02 | 2019-01-02 | The interdigital microstrip filter of multilayer folding |
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| Publication Number | Publication Date |
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| CN209515948U true CN209515948U (en) | 2019-10-18 |
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| CN201920005097.3U Expired - Fee Related CN209515948U (en) | 2019-01-02 | 2019-01-02 | The interdigital microstrip filter of multilayer folding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564682A (en) * | 2020-05-22 | 2020-08-21 | 中北大学 | Interdigital low group delay filter with double-layer four-resonance unit |
-
2019
- 2019-01-02 CN CN201920005097.3U patent/CN209515948U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564682A (en) * | 2020-05-22 | 2020-08-21 | 中北大学 | Interdigital low group delay filter with double-layer four-resonance unit |
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Granted publication date: 20191018 Termination date: 20210102 |