CN107546447A - A kind of multimode cavity folding filter - Google Patents
A kind of multimode cavity folding filter Download PDFInfo
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- CN107546447A CN107546447A CN201710638484.6A CN201710638484A CN107546447A CN 107546447 A CN107546447 A CN 107546447A CN 201710638484 A CN201710638484 A CN 201710638484A CN 107546447 A CN107546447 A CN 107546447A
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Abstract
The invention discloses a kind of multimode cavity folding filter, and it is formed by least two multimode cavity main body cascade, is covered around each multimode cavity main body by metal or electroplated metal layer.Multimode cavity main body can have the cavity of same shape or cavity of different shapes.Cavity of different shapes can be the polygon chamber such as rectangular cavity, elliptic cavity, triangular chamber.Cascade between multimode cavity main body is connected by coupled resonator., can also be without stacking and single-chamber wave filter can reduce total volume with stacked together, but needed to do Shape design according to communication system hardware.The present invention realizes that cavity folds using the mode of cavity side coupling, and the size and volume of wave filter is greatly reduced, and reduces the volume of whole communication system.Wave filter electrical property is adjusted by the design of cavity body filter dependency structure parameter, screw tuning mode cumbersome in conventional filter is eliminated, helps to simplify production, reduce cost.
Description
Technical field
The present invention relates to wave filter, more particularly to a kind of multimode cavity folding filter.
Background meter art
Microwave filter is part essential in Modern Communication System, and its most important effect is exactly to make those useless
Signal can decay when passing through wave filter, and useful signal can effectively be transmitted.Cavity body filter is in microwave filter
One kind, formed usually using multiple resonators as the cascade of LC equivalent circuits, each resonator forms electricity with input, output port
The path of magnetic wave energy flowing.
When resonator works are in single mode, the cavity body filter is single mode wave filter.Single mode wave filter is intended to by structure
Build to separate the cascade of physics resonator, this cascade is shown between resonator or resonator and input/output end port
Various couplings.Each resonator has single leading resonant frequency or pattern in single mode wave filter, by provide resonant frequency or
Pattern and these resonators are coupled.These resonators are coupled together by the waveguide connected between cavity.
Generally, the cross-couplings between resonator provide transmission pole and zero point, and it can be tuned to provide expectation in specific frequency
Filter freguency response.Common cylindrical cavity multi-mode filter is using single resonator and coupled waveguide separate machined
Method, by the coupling iris in cavity, tuning screw, and coupling screws realize filtering characteristic.
Document " four chamber dual-mode ellipse function waveguide filters " (《Telecom technology》,1978(5):In 44-61), on double
The design of mould waveguide filter is described in detail, and has two orthogonal H in one cylindrical cavity of the wave filter111Pattern is energized, therefore
One actual cavity plays a part of two electric chambers, realizes the technology of multimode cavity.In the art, filter construction quilt
The excessively complexity of design, also includes tuning screw, coupling screws, these elements can have a strong impact on processing in addition to original circular waveguide
Efficiency, machining accuracy.In " the Substrate Integrated that Tang, Hong Jun and W.Hong et al. are proposed
In Waveguide Dual Mode Filter with Circular Cavity " documents, a kind of bimodulus cylindrical cavity medium is described
Integral wave guide filter, the wave filter, covered with metal level, are formed by punching on the metal layer in medium substrate upper and lower faces
Similar to the structure of resonator, several rows of aperture is equivalent to the metallic walls of resonator, metal of the electromagnetic energy in keyhole formation
Propagated between wall.This technology causes filter size to be substantially reduced, and difficulty of processing is also greatly lowered, because such bimodulus filters
Utensil has the advantage in structure, but the insertion loss of this kind of wave filter is general all bigger than cavity body filter, also has temperature change
The frequency shift (FS) brought.In " the A Millimeter Wave High-Isolation that Duong, Tuan Viet are proposed
In Diplexer Using Selectivity-Improved Dual-Mode Filters " documents, describe a kind of using double
The millimeter wave duplexer of mode filter, text in duplexer be made up of completely metal cavitg, without any tuning screw.But
In order to obtain good filtering characteristic, the mode of cavity cascade is employed in text, this method space availability ratio is very low, especially should
Its size is difficult to receive during for low frequency designs.A kind of multimode cavity of Application No. CN201480009875.6 disclosure of the invention
Wave filter, at least two dielectric resonator main bodys are contained, wherein each resonator combines a piece of dielectric substance, the filter
Ripple utensil has preferable electrical property, but the introducing of dielectric material can cause the frequency that insertion loss increases and temperature change is brought
Skew.
Many single mode wave filters are in order to for realizing technical indicator, it has to by cascading more piece resonator so as to reaching very
Good filtering characteristic, but also result in the size of wave filter in itself simultaneously and increase considerably so that difficulty of processing also improves a lot.
Not only difficulty of processing is big for common cylindrical cavity multi-mode filter, and processing charges is high, and after Product processing comes out, be assembled together error value product
Tiring out also can be relatively large, does not only have tuning screw on each resonator and also has coupling screws, the quantity of screw directly affects filter
The tuning difficulty and production efficiency of ripple device, also result in the reduction of Q values, insertion loss increase.The multi-mode filter body of loaded medium
Product is smaller, but the introducing of medium can bring bigger insertion loss and temperature instability.
The content of the invention
The present invention is directed to the deficiency of above-mentioned common cylindrical cavity multi-mode filter, proposes a kind of multimode cavity folding filter, its
Filter transfer characteristic is designed using the coupling of cavity body filter side, and regulation cavity body filter size, eliminates biography
Cumbersome screw tuning mode in system wave filter so that the Q values of wave filter improve, and Insertion Loss reduces.Utilize coupled resonator simultaneously
The stacking that cascade multimode cavity main body realizes wave filter is placed, and substantially reduces the size of wave filter planar dimensions.
To achieve the above object, the technical solution adopted by the present invention is a kind of multimode cavity folding filter, and it is by extremely
What few more than two multimode cavity main body cascades formed, by metal or plating gold around each multimode cavity main body
Belong to layer covering.
Further, above-mentioned multimode cavity main body can have the cavity of same shape or cavity of different shapes.
Cavity of different shapes can be rectangular cavity, elliptic cavity, triangular chamber or other polygon chambers.
Further, the cascade between above-mentioned multimode cavity main body is connected by coupled resonator.
Coupled resonator can be air filling, can also be partially filled with or be stuffed entirely with as needed dielectric.
Multimode cavity folding filter includes two or more single-chamber wave filters, is of coupled connections by air resonance chamber.
Single-chamber wave filter can reduce total volume with stacked together, can also be without stacking, but according to communication system
System hardware needs to do Shape design.
Preferably, the cascade that above-mentioned Shape design refers between multimode cavity main body can be in a ring or in certain angle
Degree distribution, but this is also not necessarily limited to, can be other shapes distribution.
Compared with prior art, advantage of the present invention is：
1. the mode coupled using cavity side realizes that cavity folds, the size and volume of wave filter is greatly reduced, enters
And it can effectively reduce the volume of whole communication system.
2. adjusting wave filter electrical property by the design of cavity body filter dependency structure parameter, conventional filter is eliminated
In cumbersome screw tuning mode, simplify production, assembly technology, production efficiency can be greatly improved, reduce cost.
3. any dielectric fill material is not used in cavity body filter, Q values can be effectively improved, reduce insertion loss, and increase
The temperature stability of wave filter.
4. cavity folding filter further can carry out being bonded Shape design with the geometry external form of communication system, no longer simple
Singly as a kind of cascade microwave device, be advantageous to communication system integrated design, can further reduce its volume.
Brief description of the drawings
Fig. 1 is the 3 dimensional drawing of bimodulus single-chamber wave filter.
Fig. 2 is the top view and side view of the bimodulus cylindrical cavity wave filter.
Fig. 3 is the electromagnetic coupled logic chart of bimodulus single-chamber wave filter.
Fig. 4 is bimodulus stacking cylindrical cavity wave filter 3 dimensional drawing.
Fig. 5 is the 3-D view of the Air Coupling resonator.
Fig. 6 is the coupled relation figure that bimodulus is laminated cylindrical cavity wave filter.
Fig. 7 is that bimodulus is laminated the actual measurement of cylindrical cavity filter insertion loss, simulation comparison figure.
Fig. 8 is that bimodulus is laminated the actual measurement of cylindrical cavity wave filter return loss, simulation comparison figure.
Embodiment
In conjunction with accompanying drawing, the present invention is further detailed explanation.
The invention provides a kind of multimode cavity folding filter, including two, three, or multiple multimode resonance
Device main body.
Bimodulus cylindrical cavity wave filter is most simple in all structures, most basic structure in described multimode resonator main body,
The present invention but is not limited to this using bimodulus cylindrical cavity wave filter as example, multimode resonator main body can be rectangle cavity filter,
Oval cavity filter, triangular chamber fluid filter, even polygon cavity body filter.
As an example of the present invention, Fig. 1 show the 3 dimensional drawing of bimodulus single-chamber wave filter, wherein 1 is circle
Bimodulus resonant cavity, 3 be rectangular waveguide mouth, and for inputting or exporting electromagnetic wave energy, 2 be cylindrical cavity wave filter 1 and square wave
Lead the impedance conversion waveguide of mouth 3.
The cavity can support two modes of resonance, and whole inside cavity is air filling, and whole core texture does not have
There is any tuning screw.Fig. 2 is the top view and side view of the bimodulus cylindrical cavity wave filter, and the dimensional parameters of Each part are also
Mark, wherein R be cylindrical cavity radius, X1, X2The width of respectively two sections rectangle coupling windows, Y1, Y2Respectively two sections of rectangle couplings
The length of window, W are the rectangular waveguide width of two sections of coupling window outer ends.The impedance conversion waveguide core line on bimodulus resonance cylindrical cavity both sides
Intersection point be exactly cylindrical cavity the center of circle, the angle of center line is α, this variable be control the single-chamber coefficient of coup key parameter.It is whole
Individual cavity is surrounded completely by the metallic walls of same thickness, and resonance chamber air thickness is t.Bimodulus cylindrical cavity wave filter has two resonance
Point, also referred to as limit, according to the mode of resonance of electromagnetic wave in cylindrical cavity, the radius R of cylindrical cavity can be calculated by formula,
Wherein c is the light velocity in vacuum, fTM110With p110It is the resonant frequency and constant of the circular cavity respectively, this example
Middle electromagnetic wave mode of resonance is TM110, constant p110=3.823, fTM110=3.5GHz.Fig. 3 show the cylindrical cavity wave filter
Electromagnetic coupled logic chart, wherein circular stain S represents the input of rectangular waveguide, i.e., one end that electromagnetic energy enters is circular
Stain L represents one end of the output end of rectangular waveguide, i.e. electromagnetic energy output, and rectangle stain is represented in bimodulus cylindrical cavity
Both of which, electromagnetic coupled logic chart represent two kinds of modes of resonance respectively the coupling with input output end and both of which from
The coupling of body.
The simple example of multimode cavity folding filter one of the present invention is：Above-mentioned single-chamber filter stacks are existed
Together, as shown in figure 4, DMCC (Dual-Mode Circular Cavity, bimodulus cylindrical cavity) 1 filters for upper strata bimodulus single-chamber in figure
Ripple device, DMCC2 are lower floor's bimodulus single-chamber wave filter.Upper and lower layer single-chamber wave filter is coupled by the air resonance chamber 4 of side
Cascade, can effectively reduce dimension of the wave filter in horizontal plane, Fig. 5 show the 3-D view of the Air Coupling resonator.
Need exist for, it is emphasized that each multimode resonator main body can be not similar shape in multimode cavity folding filter
Shape, different types of wave filter.
In multimode cavity folding filter of the present invention, two or more single-chamber wave filters pass through well-designed sky
Gas resonator is of coupled connections, and can reduce total volume with stacked together, can also be without stacking, but according to communication system
Hardware needs to do Shape design.
Coupled resonator 4 can be air filling, can also be partially filled with or be stuffed entirely with as needed dielectric.
Fig. 4 bimodulus is laminated cylindrical cavity wave filter 3 dimensional drawing.Wherein, DMCC 1 is upper strata bimodulus single-chamber wave filter, DMCC2
It is bimodulus cylindrical cavity for lower floor's bimodulus single-chamber wave filter, 1,4 be DMCC1 and DMCC2 coupled resonator.3 and 5 be the wave filter
Input/output waveguide port.
Multimode cavity folding filter example of the present invention:It is laminated the concrete structure parameter such as table 1 of cavity body filter
Shown, the wave filter can realize four limits and two transmission zeros.The coupled relation of bimodulus stacking cylindrical cavity wave filter can be with
Represented with Fig. 6, wherein circular stain represent respectively be electromagnetic wave input and output, that is, stacking cavity body filter in
Input and output end (3 in Fig. 4 and 5).Two rectangle stains in DMCC1 block diagrams are referred in the circular resonant cavity of upper strata
Two kinds of modes of resonance, two rectangle stains in DMCC2 block diagrams refer to two kinds of modes of resonance in lower floor's circular resonant cavity,
Triangle among two block diagrams then represents the cascade connection between upper and lower layer bimodulus single-chamber wave filter.
Table 1：Bimodulus is laminated cylindrical cavity filter size parameter
| Meaning of parameters | Parameter | Initial value | Unit |
| First paragraph impedance converts duct width | X1 | 47 | mm |
| Second segment impedance converts duct width | X2 | 48 | mm |
| First paragraph impedance converts waveguide length | Y1 | 26 | mm |
| Second segment impedance converts waveguide length | Y2 | 17 | mm |
| Coupled resonator width | w | 21 | mm |
| Coupled resonator height | h | 3 | mm |
| Coupled resonance cavity length | L | 47 | mm |
| Cylindrical cavity radius | R | 44 | mm |
| Overall filter thickness | t | 4 | mm |
| Input/output terminal rectangular waveguide is wide | W | 53 | mm |
| Waveguide center line angle | α | 110 | deg |
The emulation of the multimode cavity folding filter electrical characteristics and test result as shown in Figure 7 and Figure 8, can from figure
Go out, 3 D electromagnetic simulation result coincide very well with processing measured result, the Insertion Loss very little in its passband, generally less than 0.5dB, band
It is outer to suppress, the needs of the 5th Generation Mobile Communication System can be met well.
In summary, the present invention utilizes the coupling of cavity body filter side, and regulation cavity body filter size to design
Filter transfer characteristic, eliminate screw tuning mode cumbersome in conventional filter so that the Q values of wave filter improve, Insertion Loss
Reduce.Cascade between multimode cavity main body is realized by specially designed coupled resonator, reduces cavity body filter
Overall dimension.Multimode cavity main body is cascaded using coupled resonator, the stacking for realizing wave filter is placed, and substantially reduces filter
The size of ripple device planar dimensions, has further liberated the thought of cavity body filter cascaded design, can be filtered the tax of device
Shape designs.
Claims (8)
- A kind of 1. multimode cavity folding filter, it is characterised in that be by least two multimode cavity main body cascade and Into, covered around each multimode cavity main body by metal or electroplated metal layer.
- 2. multimode cavity folding filter according to claim 1, it is characterised in that the multimode cavity main body can be with Cavity or cavity of different shapes with same shape.
- 3. multimode cavity folding filter according to claim 2, it is characterised in that the cavity of different shapes can be with It is rectangular cavity, elliptic cavity, triangular chamber or polygon chamber.
- 4. multimode cavity folding filter according to claim 1, it is characterised in that between the multimode cavity main body Cascade be to be connected by coupled resonator.
- 5. multimode cavity folding filter according to claim 4, it is characterised in that the coupled resonator can be empty Gas is filled, and can also be partially filled with or be stuffed entirely with as needed dielectric.
- 6. multimode cavity folding filter according to claim 4, it is characterised in that the multimode cavity folding filter Comprising two or more single-chamber wave filters, it is of coupled connections by air resonance chamber.
- 7. multimode cavity folding filter according to claim 6, it is characterised in that the single-chamber wave filter can be laminated Reduce total volume together, can also be without stacking, but needed to do Shape design according to communication system hardware.
- 8. multimode cavity folding filter according to claim 6, it is characterised in that the Shape design refers to multimode resonance Cascade between cavity main body can be distributed in a ring or at an angle.
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| CN201710638484.6A CN107546447B (en) | 2017-07-31 | 2017-07-31 | Multimode cavity folding filter |
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| CN201710638484.6A CN107546447B (en) | 2017-07-31 | 2017-07-31 | Multimode cavity folding filter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0687027A2 (en) * | 1994-06-08 | 1995-12-13 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Dual mode cavity for waveguide bandpass filters |
| CN104995788A (en) * | 2013-02-21 | 2015-10-21 | 梅萨普莱克斯私人有限公司 | Multi-mode cavity filter |
| CN104995787A (en) * | 2013-02-21 | 2015-10-21 | 梅萨普莱克斯私人有限公司 | A multi-mode cavity filter |
| CN207624882U (en) * | 2017-07-31 | 2018-07-17 | 南京邮电大学 | A kind of multimode cavity folding filter |
-
2017
- 2017-07-31 CN CN201710638484.6A patent/CN107546447B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0687027A2 (en) * | 1994-06-08 | 1995-12-13 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Dual mode cavity for waveguide bandpass filters |
| CN104995788A (en) * | 2013-02-21 | 2015-10-21 | 梅萨普莱克斯私人有限公司 | Multi-mode cavity filter |
| CN104995787A (en) * | 2013-02-21 | 2015-10-21 | 梅萨普莱克斯私人有限公司 | A multi-mode cavity filter |
| CN207624882U (en) * | 2017-07-31 | 2018-07-17 | 南京邮电大学 | A kind of multimode cavity folding filter |
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Application publication date: 20180105 Assignee: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS INSTITUTE AT NANTONG Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980006914 Denomination of invention: A multimode cavity folded filter Granted publication date: 20200922 License type: Common License Record date: 20201021 |
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