CN207624882U - A kind of multimode cavity folding filter - Google Patents
A kind of multimode cavity folding filter Download PDFInfo
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- CN207624882U CN207624882U CN201720941170.9U CN201720941170U CN207624882U CN 207624882 U CN207624882 U CN 207624882U CN 201720941170 U CN201720941170 U CN 201720941170U CN 207624882 U CN207624882 U CN 207624882U
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Abstract
The utility model discloses a kind of multimode cavity folding filter, covered by metal or electroplated metal layer around each multimode cavity main body made of at least two multimode cavity main body cascade.Multimode cavity main body can have the cavity of same shape or cavity of different shapes.Cavity of different shapes can be the polygons chamber such as rectangular cavity, elliptic cavity, triangular chamber.Cascade between multimode cavity main body is connected by coupled resonator.And single-chamber filter stacked together can reduce total volume, can not also be laminated, but be needed to do Shape design according to communication system hardware.The utility model by cavity side couple in the way of realize cavity fold, the size and volume of filter is greatly reduced.Filter electrical property is adjusted by the design of cavity body filter dependency structure parameter, eliminates screw tuning mode cumbersome in conventional filter, helps to simplify production, reduces cost.
Description
Technical field
The utility model is related to filter more particularly to a kind of multimode cavity folding filters.
Background technology
Microwave filter is essential component in Modern Communication System, its most important effect is exactly to make those useless
Signal can decay when passing through filter, and useful signal can effectively be transmitted.Cavity body filter is in microwave filter
One kind is cascaded usually using multiple resonant cavities as LC equivalent circuits, and each resonant cavity constitutes electricity with input, output port
The path of magnetic wave energy flowing.
When resonator works are in single mode, which is single mode filter.Single mode filter is intended to by structure
It builds to detach the cascade of physics resonator, this cascade is shown between resonator or resonator and input/output end port
Various couplings.Each resonator has individually leading resonant frequency or pattern in single mode filter, by provide resonant frequency or
Pattern and these resonators are coupled.These resonators are coupled together by the waveguide connected between cavity.
In general, the cross-couplings between resonator provide transmission pole and zero, expectation can be tuned to provide in specific frequency
Filter freguency response.Common cylindrical cavity multi-mode filter is using single resonant cavity 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), about double
The design of mould waveguide filter is described in detail, and there are two orthogonal H in one cylindrical cavity of the filter111Pattern is energized, therefore
One practical cavity plays a part of two electrical chambers, realizes the technology of multimode cavity.In the art, filter construction quilt
Design it is excessively complicated, further include tuning screw other than original circular waveguide, coupling screws, these elements can seriously affect processing
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 filter are covered with metal layer in medium substrate upper and lower faces, are formed on the metal layer by punching
Similar to the structure of resonant cavity, several rows of aperture is equivalent to the metallic walls of resonant cavity, metal of the electromagnetic energy in keyhole formation
It is propagated between wall.This technology makes filter size 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 filter is generally 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 of completely metal cavitg, not any tuning screw.However
Good filtering characteristic in order to obtain uses the cascade mode of cavity in literary, and this method space availability ratio is very low, especially answers
Its size is difficult to receive when for low frequency designs.Application No. is a kind of multimode cavities of the disclosure of the invention of CN201480009875.6
Fluid filter contains at least two dielectric resonator main bodys, wherein each resonator combines a piece of dielectric substance, it should
Filter has preferable electrical property, but the introducing of dielectric material can lead to the frequency that insertion loss increases and temperature change is brought
Rate deviates.
Many single mode filters are in order to for realizing technical indicator, it has to by cascading more piece resonator to reach very
Good filtering characteristic, but the size for also resulting in filter itself simultaneously increases considerably so that and difficulty of processing also improves very much.
Not only difficulty of processing is big for common cylindrical cavity multi-mode filter, and processing charges is high, and after product processes, be assembled together error value product
Tiring out also can be relatively large, not only has tuning screw to also have coupling screws, the quantity of screw to directly affect filter on each resonant cavity
The tuning difficulty and production efficiency of wave device, also result in the reduction of Q values, and insertion loss increases.The multi-mode filter body of loaded medium
Product smaller, but the introducing of medium can bring the insertion loss and temperature instability of bigger.
Utility model content
The utility model is directed to the deficiency of above-mentioned common cylindrical cavity multi-mode filter, proposes a kind of multimode cavity filter folding
Device utilizes the coupling of cavity body filter side, and adjusts cavity body filter size to design filter transfer characteristic, removes
Cumbersome screw tuning mode in conventional filter so that the Q values of filter improve, and Insertion Loss reduces.It is humorous using coupling simultaneously
The stacking that the chamber that shakes cascade multimode cavity main body realizes filter is placed, and the size of filter planar dimensions is substantially reduced.
To achieve the above object, the technical solution adopted in the utility model is a kind of multimode cavity folding filter, is
Made of at least two multimode cavity main body cascade, by metal or electricity around each multimode cavity main body
Metal cladding covers.
Further, the cavity or cavity of different shapes that above-mentioned multimode cavity main body can be with same shape.
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 filters, is of coupled connections by air resonance chamber.
Single-chamber filter stacked together can reduce total volume, can not also be laminated, but according to communication system
System hardware needs to do Shape design.
Preferably, above-mentioned Shape design refer to the cascade between multimode cavity main body can in a ring or be in certain angle
Degree distribution, but it is also not necessarily limited to this, can be other shapes distribution.
Compared with prior art, the utility model advantage is：
1. realizing that cavity folds in the way of the coupling of cavity side, the size and volume of filter is greatly reduced, into
And it can effectively reduce the volume of entire communication system.
2. adjusting 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 filter.
4. cavity folding filter further can carry out being bonded Shape design with the geometry external form of communication system, no longer simple
It singly is used as a kind of cascade microwave device, is conducive to communication system integrated design, can further reduce its volume.
Description of the drawings
Fig. 1 is the 3 dimensional drawing of bimodulus single-chamber filter.
Fig. 2 is the vertical view and side view of the bimodulus cylindrical cavity filter.
Fig. 3 is the electromagnetic coupling logic chart of bimodulus single-chamber filter.
Fig. 4 is bimodulus stacking cylindrical cavity filter 3 dimensional drawing.
Fig. 5 is the 3-D view of the Air Coupling resonant cavity.
Fig. 6 is the coupled relation figure that cylindrical cavity filter is laminated in bimodulus.
Fig. 7 is that the actual measurement of cylindrical cavity filter insertion loss, simulation comparison figure is laminated in bimodulus.
Fig. 8 is that the actual measurement of cylindrical cavity filter return loss, simulation comparison figure is laminated in bimodulus.
Specific implementation mode
The utility model is described in further detail in conjunction with attached drawing.
The utility model provides a kind of multimode cavity folding filter, including two, three or multiple multimodes
Resonator body.
Bimodulus cylindrical cavity filter is most simple in all structures, most basic structure in the multimode resonator main body,
The utility model is using bimodulus cylindrical cavity filter as example, and but it is not limited to this, and multimode resonator main body can be rectangular cavity filter
Wave device, oval cavity filter, triangular chamber fluid filter, even polygon cavity body filter.
As an example of the utility model, Fig. 1 show the 3 dimensional drawing of bimodulus single-chamber filter, wherein 1 is
Round bimodulus resonant cavity, 3 be rectangular waveguide mouth, and for inputting or exporting electromagnetic wave energy, 2 be cylindrical cavity filter 1 and square
The impedance of shape waveguide mouth 3 converts waveguide.
The cavity can support two modes of resonance, and entire inside cavity is air filling, and entire nuclear structure does not have
There is any tuning screw.Fig. 2 is the vertical view and side view of the bimodulus cylindrical cavity filter, and the dimensional parameters of Each part are also
Mark, wherein R are the radius of cylindrical cavity, 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 on bimodulus resonance cylindrical cavity both sides converts waveguide core line
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
A cavity is surrounded completely by the metallic walls of same thickness, and resonance chamber air thickness is t.There are two resonance for bimodulus cylindrical cavity filter
The radius R of cylindrical cavity can be calculated according to the mode of resonance of electromagnetic wave in cylindrical cavity in point, also referred to as pole by formula,
Wherein c is the light velocity in vacuum,With p110It is the resonant frequency and constant of the circular cavity, this example respectively
Middle electromagnetic wave mode of resonance is TM110, constant p110=3.823,Fig. 3 show the cylindrical cavity filter
Electromagnetic coupling logic chart, wherein circle stain S represents the input terminal of rectangular waveguide, i.e., one end that electromagnetic energy enters is round
Stain L represents the output end of rectangular waveguide, i.e. one end of electromagnetic energy output, rectangle stain represents in bimodulus cylindrical cavity
Both of which, electromagnetic coupling logic chart indicate two kinds of modes of resonance respectively with the coupling of input terminal output end and both of which from
The coupling of body.
The simple example of multimode cavity folding filter one described in the utility model is：By above-mentioned single-chamber filter heap
It stacks, as shown in figure 4, DMCC (Dual-Mode Circular Cavity, bimodulus cylindrical cavity) 1 is upper layer bimodulus list in figure
Cavity filter, DMCC2 are lower layer's bimodulus single-chamber filter.Upper and lower layer single-chamber filter is carried out by the air resonance chamber 4 of side
Coupled cascade can effectively reduce filter in the dimension of horizontal plane, and Fig. 5 show the 3-D view of the Air Coupling resonant cavity.
It needs 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 filter.
In multimode cavity folding filter described in the utility model, two or more single-chamber filters pass through well-designed
Air resonance chamber be of coupled connections, stacked together can reduce total volume, can not also be laminated, 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.
Cylindrical cavity filter 3 dimensional drawing is laminated in Fig. 4 bimodulus.Wherein, DMCC 1 is upper layer bimodulus single-chamber filter, DMCC2
It is bimodulus cylindrical cavity for lower layer's bimodulus single-chamber filter, 1,4 be the coupled resonator of DMCC1 and DMCC2.3 and 5 be the filter
Input/output waveguide port.
Multimode cavity folding filter example described in the utility model:The concrete structure parameter of cavity body filter is laminated such as
Shown in table 1, which can realize four poles and two transmission zeros.The coupled relation of cylindrical cavity filter is laminated in bimodulus
Can be indicated with Fig. 6, wherein round stain indicate respectively be the input and output of electromagnetic wave, that is, cavity body filter is laminated
In input terminal and output end (3 in Fig. 4 and 5).Two rectangle stains in DMCC1 block diagrams are referred in upper layer circular resonant
Two kinds of modes of resonance in chamber, two rectangle stains in DMCC2 block diagrams refer to two kinds of resonance in lower layer's circular resonant cavity
Pattern, the triangle among two block diagrams then indicate the cascade connection between upper and lower layer bimodulus single-chamber filter.
Table 1：Cylindrical cavity filter size parameter is laminated in bimodulus
| Meaning of parameters | Parameter | Initial value | Unit |
| First segment impedance converts duct width | X1 | 47 | mm |
| Second segment impedance converts duct width | X2 | 48 | mm |
| First segment 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 |
| Whole 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 are 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 passband, generally less than 0.5dB, band
It is outer to inhibit, the needs of the 5th Generation Mobile Communication System can be met well.
In conclusion the utility model utilizes the coupling of cavity body filter side, and adjusts cavity body filter size and come
Filter transfer characteristic is designed, screw tuning mode cumbersome in conventional filter is eliminated so that the Q values of filter improve,
Insertion Loss reduces.The cascade between multimode cavity main body is realized by specially designed coupled resonator, reduces cavity filtering
The overall dimension of device.Multimode cavity main body is cascaded using coupled resonator, the stacking for realizing filter is placed, and is greatly reduced
The size of filter planar dimensions, has further liberated the thought of cavity body filter cascaded design, can be filtered device
Shape design.
Claims (8)
1. a kind of multimode cavity folding filter, it is characterised in that be by least two multimode cavity main body cascade and
At, it is covered by metal or electroplated metal layer around each multimode cavity main body.
2. multimode cavity folding filter according to claim 1, it is characterised in that the multimode cavity main body can be with
Cavity with same shape or cavity of different shapes.
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 dielectric can also be partially filled with or be stuffed entirely with as needed.
6. multimode cavity folding filter according to claim 4, it is characterised in that the multimode cavity folding filter
Including two or more single-chamber filters, are of coupled connections by air resonance chamber.
7. multimode cavity folding filter according to claim 6, it is characterised in that the single-chamber filter can be laminated
Reduce total volume together, can not also be laminated, but is needed to do Shape design according to communication system hardware.
8. multimode cavity folding filter according to claim 7, 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201720941170.9U CN207624882U (en) | 2017-07-31 | 2017-07-31 | A kind of multimode cavity folding filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720941170.9U CN207624882U (en) | 2017-07-31 | 2017-07-31 | A kind of multimode cavity folding filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546447A (en) * | 2017-07-31 | 2018-01-05 | 南京邮电大学 | A kind of multimode cavity folding filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546447A (en) * | 2017-07-31 | 2018-01-05 | 南京邮电大学 | A kind of multimode cavity folding filter |
| CN107546447B (en) * | 2017-07-31 | 2020-09-22 | 南京邮电大学 | Multimode cavity folding filter |
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