CN110137643A - A kind of controllable big frequency of bandwidth is than coaxial cavity double frequency filter - Google Patents
A kind of controllable big frequency of bandwidth is than coaxial cavity double frequency filter Download PDFInfo
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- CN110137643A CN110137643A CN201910433222.5A CN201910433222A CN110137643A CN 110137643 A CN110137643 A CN 110137643A CN 201910433222 A CN201910433222 A CN 201910433222A CN 110137643 A CN110137643 A CN 110137643A
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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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
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Abstract
The invention discloses a kind of controllable big frequencies of bandwidth than coaxial cavity double frequency filter, it include: the first coaxial cavity, second coaxial cavity, input port, output port, first rectangular metal coupling piece, second rectangular metal coupling piece, the first Stepped Impedance wafer sheet load resonator, and the second Stepped Impedance wafer sheet loads resonator, coupling window, entire filter construction are the symmetrical structure about coupling window median plane.The present invention not only realizes the controllable cavity double frequency filter of centre frequency, also achieves the big frequency ratio characteristic between two passband central frequencies.The bandwidth of two passbands can be individually controllable in a certain range at the same time, and small size, high power capacity, and design and the processing is simple is all the beneficial effect of the filter, the design requirement that can satisfy small sized double frequency communication system can be applied in the microwave electrons system such as mobile communication, radar, satellite.
Description
Technical field
The present invention relates to the controllable big frequencies of a kind of cavity body filter more particularly to a kind of bandwidth to filter than coaxial cavity double frequency
Device.
Background technique
With the fast development of wireless communication, frequency spectrum resource seems growing tension.In order to reduce communications cost and improve frequency
Utilization rate is composed, double frequency filter is as most common multiband filter, because it can be compatible with the dual band communication system of two kinds of different systems
Unite front end Primary Component and become research hotspot.Coaxial cavity double frequency filter due to filter with low insertion loss, high q-factor (quality because
Number), the advantages such as high power capacity and high stability, be applied widely in highly selective narrow band communication, especially with
Radio-frequency filter based on coupling coaxial cavity filter is still the pass in mobile communication base station, satellite communication system and military communication system
One of button apparatus.
2015, Chen Fuchang research team proposed a kind of bimodulus resonant cavity using Stepped Impedance on IEEE MWCL
The method for designing coaxial double-frequency filter.In the filter, coaxial inner conductor uses Stepped Impedance structure, passes through its electrical length
With the mould three times of impedance ratio control resonator and the resonance frequency (frequency ratio be 2) of basic mode, use spiral feed structure and
Hybrid electromagnetic coupled structure, Fig. 1 are that the frequency of the filter is accordingly schemed.This method can promote the range of passband central frequency ratio,
But only the achievable frequency of Stepped Impedance coaxial resonator is than limited, and the independent control of two pass band widths relatively difficult to achieve and
It adjusts.Therefore, the Research Challenges of cavity double frequency filter are at present: how to guarantee two pass band widths in a certain range
Realize big frequency than cavity double frequency filter in the case where all controllable.
The wafer sheet loading technique of Stepped Impedance is derived to be studied according to the planer dual-frequency filter of inventor's previous work, is adopted
With minor matters load short-circuit step impedance resonator (SLQSIR) can be achieved frequency than be more than 4 bimodulus resonance characteristic.By humorous
The Analysis of Equivalent Circuit of vibration device is it is found that the resonance frequency of mould is by θ three times3And θ4It determines, after determining mould resonance frequency three times, base
The resonance frequency of mould can be by θopIt is independently determined, therefore bimodulus is individually controllable.However, the filter of the prior art, it is difficult to realize two
Big frequency ratio is realized in the case that a pass band width is all controllable in a certain range.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of compact-sized, body
Product small, at low cost, high q-factor, the bandwidth of high power capacity controllably big frequency than coaxial cavity double-frequency broadband filter.
The technical solution used to solve the technical problems of the present invention is that constructing a kind of controllable big frequency of bandwidth compares coaxial cavity
Double frequency filter, comprising: the first coaxial cavity, the second coaxial cavity, input port, output port, the first rectangular metal coupling piece, the
Two rectangular metal coupling pieces, the first Stepped Impedance wafer sheet load resonator, and the second Stepped Impedance wafer sheet loads resonator, coupling
Window；The controllable big frequency of the bandwidth is more symmetrical about the median plane of the coupling window than coaxial cavity double frequency filter；Described first
Coaxial cavity and second coaxial cavity are all hollow cube；Input signal is sent to first rectangle by the input port
Metal Coupling piece；The output port receives the output signal sent by the second rectangular metal coupling piece；Described
One rectangular metal coupling piece and the second rectangular metal coupling piece are that the controllable big frequency of the bandwidth is filtered than coaxial cavity double frequency
The feed structure of wave device, for controlling the Q value of two passbands；The first Stepped Impedance wafer sheet load resonator and the second step
It is resonance structure of the controllable big frequency of the bandwidth than coaxial cavity double frequency filter that impedance wafer sheet, which loads resonator, for generating
Form the basic mode and mould three times of two passbands；The coupling window is the controllable big frequency of the bandwidth than coaxial cavity double frequency filter
Coupled structure, for controlling the K value of two passbands.
In the controllable big frequency of bandwidth of the present invention than in coaxial cavity double frequency filter, the first rectangular metal coupling
Close piece and the second rectangular metal coupling piece by interface inner conductor extended line respectively with the input port and the output
Port is connected, and the position control basic mode of the upper end of the first rectangular metal coupling piece and the second rectangular metal coupling piece produces
Raw low frequency pass band Q value, and the position of the lower end of the first rectangular metal coupling piece and the second rectangular metal coupling piece
The control high frequency pass band Q value that mould generates three times.
In the controllable big frequency of bandwidth of the present invention than in coaxial cavity double frequency filter, the first Stepped Impedance cake
It is all by the metal of crude metal solid cylinder, load that piece, which loads resonator and the second Stepped Impedance wafer sheet load resonator,
Wafer sheet and thin metal solid cylinder are connected in series, and one end of the crude metal solid cylinder is open end, the thin metal
One end of solid cylinder is welded on the bottom center of first coaxial cavity and second coaxial cavity.
In the controllable big frequency of bandwidth of the present invention than in coaxial cavity double frequency filter, coupling window include upper window,
Middle window and lower window, the upper window offer are electrically coupled, and the lower window provides magnetic coupling, the middle window independent control institute
State being electrically coupled between metal wafer sheet.
In the controllable big frequency of bandwidth of the present invention than in coaxial cavity double frequency filter, first coaxial cavity and institute
The second coaxial cavity is stated to be surrounded by six metal coverings.
Filter of the invention not only realizes the controllable cavity double frequency filter of centre frequency, also achieves two passbands
Big frequency ratio characteristic between centre frequency.The bandwidth of two passbands can be individually controllable in a certain range at the same time, and
And small size, high power capacity, and design and the processing is simple is all the beneficial effect of the filter, in short, the filter energy
The design requirement for enough meeting small sized double frequency communication system can be applied in the microwave electrons system such as mobile communication, radar, 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 the frequency response chart of the bimodulus Resonator design coaxial double-frequency filter using Stepped Impedance in document；
Fig. 2 is according to the controllable big frequency of bandwidth proposed by the present invention than 3 dimensional view of coaxial cavity double frequency filter structure；
Fig. 3 is according to the controllable big frequency of bandwidth proposed by the present invention than coaxial cavity double frequency filter structural side view；
Fig. 4 is input terminal feed structure --- the rectangular metal coupling piece of filter proposed by the present invention；
Fig. 5 is the resonance structure of filter proposed by the present invention --- the first Stepped Impedance wafer sheet loads resonator；
Fig. 6 is coupled structure --- the three window coupling windows of filter proposed by the present invention；
Fig. 7 is to change with the radius r of load wafer sheet, the first two mode of resonance of the wafer sheet load resonator of Stepped Impedance
Variation diagram；
Fig. 8 is to change with the lower end length T1 of rectangular metal coupling piece, filter freguency response variation proposed by the present invention
Figure；
Fig. 9 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.
To realize the controllable big frequency of bandwidth than cavity double frequency filter, the present invention adds by using the wafer sheet of Stepped Impedance
Load technology realizes the controllable big frequency of bandwidth than coaxial double-frequency filter, and specific design principle is as follows:
1, double frequency-band realization principle
The controllable big frequency of bandwidth proposed by the present invention is more as Figure 2-3 than cavity double frequency filter structure chart, and Fig. 4 is feedback
Electric structure, Fig. 5 are that the wafer sheet of Stepped Impedance loads resonator, and Fig. 6 is coupled structure.Resonance is loaded using the wafer sheet of Stepped Impedance
The first two mode (wherein first mode of resonance is basic mode, and second mode is mould three times) of device realizes dual frequency characteristics, due to
Wafer sheet load(ing) point in three branch positions of coaxial inner conductor open end, thus the size of wafer sheet only influence basic mode resonance frequency and
It will not influence the resonance frequency of mould three times.
2, big frequency compares realization principle.
It is because the first two of Stepped Impedance wafer sheet load resonator is humorous why double frequency filter, which is able to achieve big frequency ratio,
The resonance frequency of vibration mode is big frequency ratio.Its principle is: 1, the high impedance end of step impedance resonator is in short-circuit end, frequency
Than increasing；2, wafer sheet loading structure is equivalent to the minor matters loading structure of plane, can further increase frequency with the increase of its radius
Than, as shown in fig. 7, increasing with the radius r of load wafer sheet, resonator fundamental resonance frequencies are constantly being reduced, and its mould is humorous three times
Vibration frequency is basically unchanged.Under both structure compositions effect, double frequency filter proposed by the present invention has big frequency ratio characteristic,
The wafer sheet size loaded at the same time can be with independent control low frequency pass band centre frequency.
3, the controllable realization principle of bandwidth
The centre frequency of the double frequency filter not only two passbands is controllable, but also bandwidth can also pass through feed structure and coupling
Structure is realized.As shown in fig. 6, feed structure is realized using rectangular metal coupling piece, due to the basic mode and three times field distribution of mould
The field distribution of difference, basic mode is most strong in resonator open end, and electric field is weaker near wafer sheet, therefore rectangular metal coupling piece
The position of upper end mainly controls the low frequency pass band Q value (Q1) of basic mode generation.And the field distribution of mould electric field near wafer sheet three times
It is relatively strong, therefore the position of the lower end of rectangular metal coupling piece mainly controls the high frequency pass band Q value (Q2) that mould generates three times.Such as Fig. 8
Shown, with the increase of the lower end length T1 of rectangular metal coupling piece, the Q1 of low frequency pass band is basically unchanged, and the Q2 of high frequency pass band is then
It changes greatly.Therefore, the Q value (Q2) of high frequency pass band then can be by T1 independent control.The K value of two passbands is by between two resonant cavities
Coupling window determine that, as shown in fig. 7, coupling window uses 3 window structures, wherein the offer of upper window is electrically coupled, lower window provides magnetic
Coupling, the K value of upper and lower two window co- controllings, two passbands, and being electrically coupled between middle window independent control wafer sheet, due to cake
The electric field of piece only influences basic mode without will affect mould three times, therefore middle window can be with the low frequency pass band that independent control basic mode is realized
K value.So first passing through the K value (K2) of upper and lower window being electrically coupled with magnetic coupling realization high frequency pass band, and middle window when design K value
Mouth size is used to adjust the K value (K1) of low frequency pass band.
It is an object of the invention to overcome the deficiencies in the prior art --- two pass band widths are difficult to realize in a certain range
The cavity double frequency filter of big frequency ratio is realized in the case where inside all controllable.By using the wafer sheet loading technique of Stepped Impedance,
Propose a kind of compact-sized, small in size, at low cost, high q-factor, the bandwidth of high power capacity controllably big frequency than coaxial cavity double frequency
Broadband filter.The filter can satisfy the design requirement of miniaturization and high power capacity, can be applied in mobile communication
The microwave electrons system such as base station, radar, remote sensing in.To achieve the above object, technical solution provided by the present invention are as follows: use
The wafer sheet loading technique of Stepped Impedance realizes that the wafer sheet of Stepped Impedance loads resonator, using rectangular metal coupling piece and 3 windows
Mouth structure realizes the controllable feed structure and coupled structure of bandwidth.
The present invention is further explained in the light of specific embodiments, it should be understood that specific implementation described herein
Example does not have to be defined in the present invention only to explain the present invention.
The description present invention, Fig. 2-3 are 3-D view and side view of the invention respectively for clarity, and a kind of bandwidth is controllable
Big frequency is than coaxial cavity double frequency filter, comprising: the first coaxial cavity 1, the second coaxial cavity 2, and input port 3, output port 4, the
One rectangular metal coupling piece 5, the second rectangular metal coupling piece 6, the first Stepped Impedance wafer sheet load resonator 7, the resistance of the second step
Anti- wafer sheet loads resonator 8, coupling window 9.
The hollow cube that first coaxial cavity 1 and the second coaxial cavity 2 all surround for six metal coverings, the first coaxial cavity 1
Having a metal covering coplanar with the second coaxial cavity 2 is coupling window 9, and input port 3 and output port 4 are opened in the first coaxial cavity respectively
On the outlet side of 1 input side and the second coaxial cavity 2, the first Stepped Impedance wafer sheet loads resonator 7 and the second Stepped Impedance cake
Piece load resonator 8 is respectively welded at the bottom center of the first coaxial cavity 1 and the bottom center of the second coaxial cavity 2.
Further, the input port 3 and output port 4 are golden with the first rectangle respectively by interface inner conductor extended line
Belong to coupling piece 5 to be connected with the second rectangular metal coupling piece 6.The position of the upper end of rectangular metal coupling piece mainly controls basic mode generation
Low frequency pass band Q value (Q1), and the position of the lower end of rectangular metal coupling piece mainly controls the high frequency pass band Q value that mould three times generates
(Q2), Fig. 4 is input terminal feed structure --- the rectangular metal coupling piece 5b of filter, it passes through interface inner conductor extended line 5a
It is connect with input port 3.
Further, the first Stepped Impedance wafer sheet load resonator 7 and the second Stepped Impedance wafer sheet load resonator 8
It is also symmetrical structure.Fig. 5 is that the first Stepped Impedance wafer sheet loads resonator structure figure, it is added by crude metal solid cylinder 7a
The metal wafer sheet 7b of load, thin metal solid cylinder 7c are connected in series, and the upper end of crude metal solid cylinder 7a is open end, carefully
The lower end of metal solid cylinder is welded on 1 bottom center of the first coaxial cavity, loads both structures in Stepped Impedance and wafer sheet
It under comprehensive function, not only realizes that two passband central frequencies are controllable, but also realizes the big frequency ratio characteristic of double frequency filter.
Further, the coupling window 9 is three window structures.Fig. 7 is three window coupling window structure charts, and upper window 8a is provided
It is electrically coupled, lower window 8c provides magnetic coupling, the K value of upper and lower two window co- controllings, two passbands, and middle window 8b is independently controlled
Being electrically coupled between wafer sheet processed, since the electric field of wafer sheet only influences basic mode without will affect mould three times, middle window 8b can be only
The K value for the low frequency pass band that vertical control is realized by basic mode, so when designing K value, first pass through upper and lower window be electrically coupled and magnetic coupling
Realize the K value (K2) of high frequency pass band, and middle window size is used to adjust the K value (K1) of low frequency pass band.
According to above embodiment, cavity size in the present embodiment is long 12mm, wide 12mm, high 40mm.The filtering
Device is made of metal, and is made in this embodiment of metallic aluminium, and silver-plated on surface layer, to reduce loss.Controllable big of bandwidth
Frequency is more as shown in Figure 9 than the transmission response simulation result of coaxial cavity double frequency filter.The low frequency pass band centre frequency of the filter
For 1.2GHz, pass band width 30MHz, high frequency pass band centre frequency is 5.8GHz, pass band width 60MHz, two passbands
Center frequency ratio is 4.83, two passbands with interior return loss S11Below 20dB.
The controllable big frequency of the bandwidth of the embodiment of the present invention is than coaxial cavity double frequency filter, and there are two centre frequency is controllable for tool
And dual-passband characteristic, biggish passband central frequency ratio and lesser size that bandwidth is controllable, it is logical to can satisfy small sized double frequency
The design requirement of letter system can be applied in the microwave electrons system such as mobile communication, radar, remote sensing, be worthy to be popularized.Packet of the present invention
It includes and is not limited in the above-mentioned embodiment provided, those skilled in the art are not departing from the present invention under design of the invention
Under the premise of principle, different deformation and replacement can be made, such as coupling window is enabled to become other shapes (Dual-window, four windows),
The coupling position for changing feeder line, is changed to other shapes for cube shaped coaxial cavity, is processed or be electroplated using other metals,
These deformations and replacement also belong to the scope of this patent.
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 (5)
1. a kind of controllable big frequency of bandwidth is than coaxial cavity double frequency filter characterized by comprising the first coaxial cavity, second
Coaxial cavity, input port, output port, the first rectangular metal coupling piece, the second rectangular metal coupling piece, the first Stepped Impedance cake
Piece loads resonator, and the second Stepped Impedance wafer sheet loads resonator, coupling window；The controllable big frequency of the bandwidth is more double than coaxial cavity
Frequency filter is symmetrical about the median plane of the coupling window；First coaxial cavity and second coaxial cavity are all hollow cubic
Body；Input signal is sent to the first rectangular metal coupling piece by the input port；The output port is received by described
The output signal that second rectangular metal coupling piece is sent；The first rectangular metal coupling piece and second rectangular metal
Coupling piece is feed structure of the controllable big frequency of the bandwidth than coaxial cavity double frequency filter, for controlling the Q of two passbands
Value；The first Stepped Impedance wafer sheet load resonator and the second Stepped Impedance wafer sheet load resonator are that the bandwidth is controllable
Big frequency than coaxial cavity double frequency filter resonance structure, for generating the basic mode and mould three times of two passbands of formation；The coupling
Closing window is coupled structure of the controllable big frequency of the bandwidth than coaxial cavity double frequency filter, for controlling the K value of two passbands.
2. the controllable big frequency of bandwidth according to claim 1 is than coaxial cavity double frequency filter, which is characterized in that described the
One rectangular metal coupling piece and the second rectangular metal coupling piece by interface inner conductor extended line respectively with the input terminal
Mouth is connected with the output port, the position of the upper end of the first rectangular metal coupling piece and the second rectangular metal coupling piece
It sets and controls the low frequency pass band Q value that basic mode generates, and the first rectangular metal coupling piece and the second rectangular metal coupling piece
Lower end position control three times mould generate high frequency pass band Q value.
3. the controllable big frequency of bandwidth according to claim 1 is than coaxial cavity double frequency filter, which is characterized in that described the
It is all by crude metal solid cylinder that one Stepped Impedance wafer sheet, which loads resonator and the second Stepped Impedance wafer sheet load resonator,
Body, the metal wafer sheet of load and thin metal solid cylinder are connected in series, and one end of the crude metal solid cylinder is open circuit
End, one end of the thin metal solid cylinder is welded on the bottom center of first coaxial cavity and second coaxial cavity.
4. the controllable big frequency of bandwidth according to claim 3 is than coaxial cavity double frequency filter, which is characterized in that the coupling
Closing window includes upper window, middle window and lower window, and the upper window offer is electrically coupled, and the lower window provides magnetic coupling, described
Being electrically coupled between metal wafer sheet described in middle window independent control.
5. the controllable big frequency of bandwidth according to claim 1 is than coaxial cavity double frequency filter, which is characterized in that described the
One coaxial cavity and second coaxial cavity are surrounded by six metal coverings.
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Cited By (4)
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| CN114167324A (en) * | 2021-12-07 | 2022-03-11 | 郑州大学 | high-Q-value cavity enhanced diamond nitrogen vacancy color center weak magnetic sensing system |
| CN114188684A (en) * | 2021-12-27 | 2022-03-15 | 井冈山大学 | Small medium loading filter with wide stop band |
| CN114204236A (en) * | 2021-12-27 | 2022-03-18 | 井冈山大学 | Cavity dual-frequency broadband filter with large frequency ratio |
| CN114204237A (en) * | 2021-12-27 | 2022-03-18 | 井冈山大学 | Small-size medium loading double-frequency filter of little frequency ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167324A (en) * | 2021-12-07 | 2022-03-11 | 郑州大学 | high-Q-value cavity enhanced diamond nitrogen vacancy color center weak magnetic sensing system |
| CN114188684A (en) * | 2021-12-27 | 2022-03-15 | 井冈山大学 | Small medium loading filter with wide stop band |
| CN114204236A (en) * | 2021-12-27 | 2022-03-18 | 井冈山大学 | Cavity dual-frequency broadband filter with large frequency ratio |
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| CN114204237B (en) * | 2021-12-27 | 2022-10-21 | 井冈山大学 | Small-size medium loading double-frequency filter of little frequency ratio |
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