CN110148820A - A kind of three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet - Google Patents
A kind of three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet Download PDFInfo
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- CN110148820A CN110148820A CN201910433570.2A CN201910433570A CN110148820A CN 110148820 A CN110148820 A CN 110148820A CN 201910433570 A CN201910433570 A CN 201910433570A CN 110148820 A CN110148820 A CN 110148820A
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- 239000004020 conductor Substances 0.000 claims abstract description 27
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 4
- 230000009916 joint effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 238000010295 mobile communication Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
Abstract
The invention discloses a kind of three Mould Breadth band filters of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet, comprising: cavity, input port, output port, input terminal L shape feeder line, output end L shape feeder line, Stepped Impedance coaxial inner conductor load wafer sheet.By Stepped Impedance wafer sheet loading technique, while realizing coaxial resonant cavity wider bandwidth, solves the oversized technological deficiency of existing cavity multi-mode filter.A kind of compact-sized, small in size, at low cost, high q-factor, the coaxial three Mould Breadths band filter based on Stepped Impedance wafer sheet loading technique of high power capacity are provided.The filter can satisfy small-sized, highly selective, and the wider design requirement of pass band width can be applied in the microwave electrons system such as the base station in mobile communication, radar, remote sensing.
Description
Technical field
The present invention relates to microwave technical fields, refer in particular to a kind of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet
Three Mould Breadth band filters.
Background technique
Microwave filter is one of very important device in current frequency microwave integrated circuit.Wherein, cavity body filter
With high power capacity, the features such as high quality factor, high stability, low-loss, good temperature characterisitic, therefore it is commonly used for leading to
Believe in the electronic equipments such as base station, Aeronautics and Astronautics, radar, electronic countermeasure, radio and television.Simultaneously as the resonator ruler of filter
There is certain inversely prroportional relationships for very little and working frequency, and when frequency is lower, the size of filter will be bigger, this restriction
The application of cavity body filter, therefore it is microwave filtering that the Miniaturization Design that device is filtered improve performance on the basis of, which becomes,
The significant challenge that device researcher faces.But cavity body filter it is maximum the disadvantage is that volume and processing cost than other forms filter
Wave device is much bigger.Cavity multi-mode filter is a kind of cavity body filter of miniaturization, in cavity multi-mode filter, a chamber energy
It realizes the filter effect that multiple single-chamber singlemode resonance devices are just able to achieve, therefore reduces the size of entire filter, to realize
The small size and low cost of cavity body filter.In order to reduce the size of filter and reduce processing cost, the filtering of cavity multimode
The research of device is increasingly becoming research hotspot both domestic and external.
According to investigations with understanding, it has been disclosed that the cavity multi-mode filter prior art it is as follows:
First method: the separation of degenerate mode is realized using the method for dielectric resonator offset.
Professor Wang Shiwei of South China Science & Engineering University in 2015 proposes a kind of three mould/tetra- deviated using metal cylinder perturbation
Mould Breadth band filter, the three moulds cylindrical cavity is interior, and there are 3 modes: ETE+Mould, ETE-Mould and ETMMould, wherein ETMThe resonance frequency of mould
It is controlled by the height of metal cylinder perturbation, ETE-Mould and ETMMould is controlled by the offset of metal cylinder perturbation.The three Mould Breadths band
The FBW of filter is 30%, and first harmonic wave is present in 5GHz, therefore stopband characteristic is poor, and bandwidth need to be widened.
On this basis, the granted patent that number of patent application is ZL 201410171537.4 is a kind of to use three mould cavity resonator of single-chamber
Broadband filter have disclosed the relevant technologies, still, the filter of the patent disclosure is fed using straight metal feeder, by inclined
The method for moving resonator separates three modes, this causes size too big, and stopband characteristic is poor.
But in the research of current cavity multi-mode filter, dimensional problem is still critical issue urgently to be solved,
Large scale will affect the application of cavity multi-mode filter.
Summary of the invention
The present invention provides a kind of based on step resistance to solve the oversized technological deficiency of existing cavity multi-mode filter
The three Mould Breadth band filter of miniaturized coaxial cavity of anti-wafer sheet load is also realized while realizing three Mould Breadth frequency pass-band performances
Miniaturization, Wide stop bands, higher passband selectivity.
The technical solution used to solve the technical problems of the present invention is that constructing a kind of based on the small of Stepped Impedance wafer sheet load
Three Mould Breadth band filter of type coaxial cavity, comprising: cylindrical cavity, input port, output port, input terminal L shape feeder line, output end
L shape feeder line, Stepped Impedance coaxial inner conductor load wafer sheet, the miniaturized coaxial cavity three based on the load of Stepped Impedance wafer sheet
Mould Breadth band filter is symmetrical about plane of symmetry A-A '；The input terminal L shape feeder line is connected with the signal wire of the input port；Institute
Output end L shape feeder line is stated to be connected with the signal wire of the output port；The lower end of the Stepped Impedance coaxial inner conductor vertically connects
The lower round bottom center of the cylindrical cavity is connect, the load wafer sheet load replaces in the thickness of the Stepped Impedance coaxial inner conductor
Center；TM01The resonance frequency of mould is by the size of the Stepped Impedance coaxial inner conductor and the size of the load wafer sheet
It codetermines；The common shadow of length of the diameter of the cylindrical cavity, the input terminal L shape feeder line and the output end L shape feeder line
Ring the resonance frequency of TE+ mould and TE- mould.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
Stepped Impedance coaxial inner conductor is upper coarse and lower fine Stepped Impedance cylindrical body, and thick column part height is the height of thin column part
The half of degree；The lower end short circuit grounding of the thin column part, and the upper end of the thick column part is opened a way.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
Load the three branch positions that wafer sheet loading position is the Stepped Impedance cylindrical body.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
The width of cylindrical cavity directly determines this resonance frequency to degenerate mode of TE+ mould and TE- mould, the input terminal L shape feeder line and institute
It is isometric symmetrical to state output end L shape feeder line, the length of the input terminal L shape feeder line and the output end L shape feeder line further influences
The resonance frequency of TE+ mould and TE- mould；The input terminal L shape feeder line and output end L shape feeder line are contour, the input terminal L shape feeder line
With the separation of height control the TE+ mould and TE- mould of the output end L shape feeder line.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
Gap between input terminal L shape feeder line and the output end L shape feeder line and the Stepped Impedance coaxial inner conductor determines feed to 3
The stiffness of coupling of a mode.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
There are source loads to couple for input terminal L shape feeder line and the output end L shape feeder line, and the source load coupling generates and controls passband two
The transmission zero on side.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
Cylindrical cavity height is higher than the height of the Stepped Impedance coaxial inner conductor.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
Input terminal L shape feeder line and the signal wire of the input port are connected by welding；The output end L shape feeder line and the output end
The signal wire of mouth is connected by welding.
It is described in the miniaturized coaxial cavity three Mould Breadth band filter of the present invention based on the load of Stepped Impedance wafer sheet
The lower end of Stepped Impedance coaxial inner conductor vertically connects the lower round bottom center of the cylindrical cavity by welding.
Three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet of the invention is realizing three Mould Breadths
While frequency pass-band performance, miniaturization, Wide stop bands, higher passband selectivity are also achieved, in addition, also there is low dispersion, set
Meter and the characteristics such as the processing is simple, can satisfy the design requirement of small wide frequency communication system, can be applied to mobile communication, radar,
In the microwave electrons system such as satellite.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is according to the miniaturized coaxial cavity three Mould Breadth band filter proposed by the present invention based on the load of Stepped Impedance wafer sheet
Structure 3 dimensional views；
Fig. 2 is according to the miniaturized coaxial cavity three Mould Breadth band filter proposed by the present invention based on the load of Stepped Impedance wafer sheet
Structure top view；
Fig. 3 is according to the miniaturized coaxial cavity three Mould Breadth band filter proposed by the present invention based on the load of Stepped Impedance wafer sheet
Structure side view；
Fig. 4 (a) is TM01Mould magnetic chart；
Fig. 4 (b) is TE- mould electric field intensity map；
Fig. 4 (c) is TE+ mould electric field intensity map；
Fig. 5 (a) is with load wafer sheet radius r variation, the resonance frequency variation diagram of three modes of resonance；
Fig. 5 (b) is with load wafer sheet radius r variation, broadband filter frequency response change figure；
Fig. 6 is the transmission response simulation result diagram according to filter proposed by the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
1, three mould realization principle.
Miniaturized coaxial cavity three Mould Breadth band filter structure chart proposed by the present invention based on the load of Stepped Impedance wafer sheet is such as
Shown in Fig. 1, Fig. 2 and Fig. 3.Fig. 4 is the magnetic distribution figure of three modes of resonance, wherein Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c)
Respectively indicate the TM in coaxial cavity01Mould magnetic chart, TE+ mould electric field intensity map and TE- mould electric field intensity map, A-A ' indicate the plane of symmetry, wherein
TM01The mould mode of resonance intrinsic for coaxial resonator, and TE+ mould and TE- mould are then to determine resonance frequency by cavity radius
A pair of of degenerate mode can control this by the height of L-shaped feeder line and separate to degenerate mode.
2, broad passband realization principle
The realization of broad passband is by controlling TM01The resonance frequency of mould, TE+ mould and TE- mould, by this 3 resonance frequency tune
3 mode close couplings are given in same broad passband, then by adjusting the height of feeder line and the gap of coaxial inner conductor, thus real
Now stable broad passband.
3, realization principle is minimized
The miniaturization of three Mould Breadth band filter of cavity, high impedance short circuit grounding are realized by Stepped Impedance wafer sheet loading technique
The Stepped Impedance structure of Low ESR open circuit can make TM01Mould is mobile to low frequency, at the same time, since wafer sheet load(ing) point is coaxial interior
Three branch positions of conductor open end, thus the size of wafer sheet only influences basic mode TM01Resonance frequency without will affect first
The resonance frequency of harmonic wave can further make TM by increasing the size of wafer sheet in this way01Mould is mobile to low frequency.Load the half of wafer sheet
Shown in the relationship of diameter r and resonance frequency such as Fig. 5 (a), the radius r with load wafer sheet changes, broadband filter frequency response change
Figure is as shown in Fig. 5 (b), wherein due to TM01Mould is mobile to low frequency, so that entire passband is mobile to low frequency, meanwhile, it is humorous by TM high order
The parasitic passband that wave generates is also mobile to low frequency.
It is an object of the invention to overcome the deficiencies in the prior art, solve the pass in the research of three Mould Breadth band filter of cavity
Key problem: while realizing coaxial resonant cavity wider bandwidth, the oversized technology of existing cavity multi-mode filter is solved
Defect.A kind of compact-sized, small in size, at low cost, high q-factor is provided, high power capacity loads skill based on Stepped Impedance wafer sheet
The coaxial three Mould Breadths band filter of art.In addition, overcoming the disadvantage and insufficient, proposition of prior art low selectivity, processing complexity etc.
Three Mould Breadth band filter of coaxial single-chamber can have the characteristics that miniaturization, highly selective, low dispersion, design and the processing is simple.
The filter can satisfy small-sized, highly selective, and the wider design requirement of pass band width can be applied to the base in mobile communication
It stands, in radar, the microwave electrons system such as remote sensing.The present invention is further explained in the light of specific embodiments, it should be understood that
Described herein specific examples are only used to explain the present invention, and does not have to be defined in the present invention.
The description present invention, Fig. 1, Fig. 2 and Fig. 3 are 3-D view of the invention, top view and side view respectively for clarity,
A kind of three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet, comprising: cavity 1, input port 2 are defeated
Exit port 3, input terminal L shape feeder line 4, output end L shape feeder line 5, Stepped Impedance coaxial inner conductor 6 load the reality of wafer sheet coaxial cavity
Intracardiac conductor 7.
The cavity 1 is a hollow cylinder cavity, and housing depth is greater than the height of Stepped Impedance coaxial inner conductor 6, chamber
The diameter of body determines the resonance frequency of a pair of TE degenerate mode, and the input port 2 and output port 3 are to pass through sub-miniature A connector periphery
4 screws it is orthogonal be fixed on the chamber outer wall of certain altitude, this highly controls this separation to TE degenerate mode；The step
Resistant coaxial inner conductor 6 is upper coarse and lower fine Stepped Impedance solid cylinder, and thick cylinder height is the one of thin cylinder height
Half, by the lower round bottom center of the vertical connecting cylinder cavity of welding, the load wafer sheet 7 loads coaxially interior in Stepped Impedance for lower end
The alternate center of the thickness of conductor；TM01The resonance frequency of mould by Stepped Impedance coaxial inner conductor 6 size and load wafer sheet
7 size codetermines；The length of the diameter of the cavity 1 and the input terminal L shape feeder line 4 and output end L shape feeder line 5 is common
Control the resonance frequency of TE+ mould and TE- mould.
Further, thin cylindrical body (high impedance) lower end short circuit grounding of the Stepped Impedance coaxial inner conductor 6, and slightly justify
Cylinder (Low ESR) upper end open circuit, by the impedance ratio of this Stepped Impedance structure control the resonance frequency of mould three times of coaxial cavity with
TM01The ratio between mould resonance frequency primarily determines TM in the case where widening stopband01Mould resonance frequency.
Further, since the thick cylinder height of the Stepped Impedance coaxial inner conductor is the one of thin cylinder height
Half, and the load wafer sheet 7 is loaded in the alternate center of thickness of Stepped Impedance coaxial inner conductor, therefore the load cake
Piece loading position is three branch positions, and this load(ing) point makes TM01The resonance frequency of mould is mobile to low frequency, and its first humorous
The resonance frequency of wave is constant, loads shown in the radius of wafer sheet and relational graph such as Fig. 5 (a) of resonance frequency, with load wafer sheet
Radius increases, TM01The resonance frequency of mould is mobile to low frequency, and the resonance frequency of other modes of resonance is almost unchanged.And Fig. 5 (b)
The radius for further demonstrating load wafer sheet only influences a mode in.Therefore it can pass through the size of control load wafer sheet
Further decrease TM01The miniaturization of mould resonance frequency realization filter.
Further, the input terminal L shape feeder line 4 and the output end L shape feeder line 5 and the Stepped Impedance it is coaxial in lead
Gap between body 6 determines feed to the stiffness of coupling of 3 modes.
Further, there are source loads to couple for the input terminal L shape feeder line and output end L shape feeder line, by controlling the coupling
Close the transmission zero for generating and controlling passband both sides.
According to above embodiment, a height of 17.2mm of cylindrical cavity size in the present embodiment, diameter 34mm.It should
Filter is made of metal, and is made in this embodiment of metallic aluminium, and silver-plated on surface layer, to reduce loss.Based on step
The simulation result diagram of the three Mould Breadth band filter of miniaturized coaxial cavity of impedance wafer sheet load is as shown in Figure 6.The center of the filter
Frequency is 2.55GHz, bandwidth 1GHz, the S of entire passband11Below 38dB, passband ripple 0.005dB, upper stopband have one
A transmission zero (0.4GHz), there are two transmission zero (4GHz and 5.8GHz), stopband range 3.1GHz- for lower stopband
6.1GHz。
The three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet of the embodiment of the present invention, has non-
Often small size, wider wideband pass-band performance, good passband selectivity and good broad stop-band, can satisfy
The design requirement of small wide frequency communication system can be applied in the microwave electrons system such as mobile communication, radar, remote sensing, be worth pushing away
Extensively.
Although the present invention be illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case where the scope of the invention, various transformation and equivalent substitute can also be carried out to the present invention.In addition, being directed to particular condition or material
Material, can do various modifications to the present invention, without departing from the scope of the present invention.Therefore, the present invention is not limited to disclosed tool
Body embodiment, and should include the whole embodiments fallen within the scope of the appended claims.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet characterized by comprising circle
Column cavity, input port, output port, input terminal L shape feeder line, output end L shape feeder line, Stepped Impedance coaxial inner conductor, load
Wafer sheet, the three Mould Breadth band filter of miniaturized coaxial cavity based on the load of Stepped Impedance wafer sheet are symmetrical about plane of symmetry A-A '；
The input terminal L shape feeder line is connected with the signal wire of the input port；The output end L shape feeder line and the output port
Signal wire is connected；The lower end of the Stepped Impedance coaxial inner conductor vertically connects the lower round bottom center of the cylindrical cavity, described
Wafer sheet load is loaded in the alternate center of thickness of the Stepped Impedance coaxial inner conductor；TM01The resonance frequency of mould is by institute
The size of the size and the load wafer sheet of stating Stepped Impedance coaxial inner conductor codetermines；The diameter of the cylindrical cavity, institute
State the resonance frequency of length the joint effect TE+ mould and TE- mould of input terminal L shape feeder line and the output end L shape feeder line.
2. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the Stepped Impedance coaxial inner conductor is upper coarse and lower fine Stepped Impedance cylindrical body, and thick column part height is
The half of the height of thin column part；The lower end short circuit grounding of the thin column part, and the upper end of the thick column part is opened
Road.
3. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 2 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the load wafer sheet loading position is three branch positions of the Stepped Impedance cylindrical body.
4. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the width of the cylindrical cavity directly determines this resonance frequency to degenerate mode of TE+ mould and TE- mould, the input
Hold L shape feeder line and the output end L shape feeder line isometric symmetrical, the length of the input terminal L shape feeder line and the output end L shape feeder line
Degree further influences the resonance frequency of TE+ mould and TE- mould；The input terminal L shape feeder line and output end L shape feeder line are contour, described
The separation of the height of input terminal L shape feeder line and the output end L shape feeder line control TE+ mould and TE- mould.
5. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
Be characterized in that, between the input terminal L shape feeder line and the output end L shape feeder line and the Stepped Impedance coaxial inner conductor between
Gap determines feed to the stiffness of coupling of 3 modes.
6. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, there are source loads to couple for the input terminal L shape feeder line and the output end L shape feeder line, and the source load coupling produces
Give birth to and control the transmission zero on passband both sides.
7. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the cylindrical cavity height is higher than the height of the Stepped Impedance coaxial inner conductor.
8. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the signal wire of the input terminal L shape feeder line and the input port is connected by welding；The output end L shape feedback
The signal wire of line and the output port is connected by welding.
9. the miniaturized coaxial cavity three Mould Breadth band filter according to claim 1 based on the load of Stepped Impedance wafer sheet,
It is characterized in that, the lower end of the Stepped Impedance coaxial inner conductor is vertically connected by welding in the lower round bottom of the cylindrical cavity
The heart.
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| CN201910433570.2A CN110148820B (en) | 2019-05-23 | 2019-05-23 | Small coaxial cavity three-mode broadband filter based on step impedance cake loading |
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| CN114204234A (en) * | 2021-12-27 | 2022-03-18 | 井冈山大学 | Small-size medium loading broadband filter |
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