CN209374636U - A kind of double-passband filter - Google Patents
A kind of double-passband filter Download PDFInfo
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- CN209374636U CN209374636U CN201920103682.7U CN201920103682U CN209374636U CN 209374636 U CN209374636 U CN 209374636U CN 201920103682 U CN201920103682 U CN 201920103682U CN 209374636 U CN209374636 U CN 209374636U
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Abstract
The utility model relates to a kind of double-passband filters, the double-passband filter includes multiple multimode resonators, multiple auxiliary coupling blocks and feeder line, feeder line includes the first branch of feeder line and the first branch of the second branch feeder of feeder line provides the coupled outside strength demand of the first passband, and the first branch of feeder line and the second branch of feeder line provide the coupled outside strength demand of the second passband.By using the double-passband filter of the utility model, bandwidth may be implemented than great double-passband filter, two band connection frequencies and bandwidth of filter can be customized freely, and spurious mode is far from two working passbands, it realizes simple, freedom degree is big, and the double-passband filter with big bandwidth ratio may be implemented, have broad application prospects.
Description
Technical field
The utility model relates to microwave technical field more particularly to wave filter technology field, in particular to a kind of big bandwidth
The double-passband filter of ratio, especially suitable for bandwidth than great double-passband filter.
Background technique
In commercial communication field, the fast development of wireless communication technique is proposed to Multifunctional radio-frequency receiving front-end
Higher requirement.Dual-passband/the comb filter supported multifrequency point communication, be capable of multi-band signal needed for accurately chosen system
At Primary Component, have a wide range of applications in terms of multi-standard mobile communication.Militarily, under complex electromagnetic environment
High-tech war is commonplace.Steal th and anti-stealth, interference and counter-measure, compacting and back-pressure system are all to our dedicated logical
Letter system proposes increasingly higher demands.Private wireless communication system must take into account increasingly sophisticated electromagnetism ring in design
Border avoids the interference of domestic electromagnetic signal as possible.High-performance comb filter facilitates by way of frequency hopping communications to enhance
The battlefield survival of communication system.
Although commercial communication and military communication all have extremely urgent demand to high-performance comb filter, however,
High performance comb filter is still deficient.This is because similar with single-pass band filter, conventional comb filter or
Be volume and weight it is excessive or be it is excessively high with interior Insertion Loss, be all difficult to meet the harsh requirement of communication system.Therefore, high temperature is used
Comb filter made of superconducting thin film just has extremely wide application prospect.
How dexterously to design circuit structure, multiple passbands enabled to meet harsh performance indicator simultaneously, just at
The design difficulty of comb filter.In recent years, common comb filter is mainly the following scheme:
(1) multiple process of subfilter.Design each independent single-pass band filter first, then by their input
Output end is attached, and just constitutes comb filter, the disadvantage is that size is often excessive, is unfavorable for device miniaturization and collection
Cheng Hua.
(2) bandstop filter is cascaded or is embedded in bandpass filter can be realized comb filter.In simple terms, it is exactly
Certain specific frequency ranges are filtered off in a wider passband using bandstop filter, and then a passband before being allowed to becomes more
A passband forms more passband responses.This method is generally only applicable to two passbands at a distance of closer situation.
(3) multimode resonator scheme.Two kinds of multimode resonators currently used more are Stepped Impedance type resonator
(SIR) and minor matters loaded type resonator (SLR).Multimode resonator scheme can significantly reduce circuit size, this point for
It is particularly important for super conductive filter.But existing design method freedom degree is small, order is low, and filtering performance is undesirable.Because more
Coupling between the coupled outside and resonator of a passband can only be adjusted with same set of physical parameter, therefore be reduced
The freedom degree of filter design.It is associated with each other between multiple passbands, interact so that designer is difficult to find one group of physics ginseng
Number, so that the filter response of each passband all reaches best.Biggish double-passband filter is differed for the bandwidth of two passbands,
Design is even more to face extreme difficulties:
(1) resonator is the basic unit for constituting filter, and the passband width of filter determines the institute between resonator
The stiffness of coupling needed, to determine the coupling distance between resonator.If the bandwidth difference of two passbands is larger, it is meant that same
A pair of of resonator will realize the stiffness of coupling of very different at two different frequencies, thus need to increase outside coupling distance
Adjustable parameter；
(2) bandwidth correlation is larger also means that feeder line needs to realize the external coupling to differ greatly at two different frequencies
It closes.
Utility model content
The utility model, than the demand and difficult point of great double-passband filter, provides one kind and passes through adjusting for bandwidth
Frequency and internal coupling needed for the main body of multimode resonator and size, the size of auxiliary coupling block of loading section realize two passbands
It closes, coupled outside is realized by phase matched type branch feeder, so as to realize the double-passband filter of big bandwidth ratio.
To achieve the goals above, the utility model has following constitute:
The utility model provides a kind of double-passband filter, and the double-passband filter includes multiple multimode resonators, more
A auxiliary coupling block and feeder line, the feeder line include the second branch of the first branch of feeder line and feeder line, and the multimode resonator includes
Main body and loading section；
The multimode resonator is used to for the working frequency of double-passband filter being adjusted to preset working frequency, and will be double
The spurious mode frequency of pass filter is adjusted to preset spurious mode frequency range；
The stiffness of coupling of coupling path of the auxiliary coupling block for changing the multimode resonator；
First branch of feeder line and the second branch of feeder line are used for the coupled outside intensity and the second passband of the first passband
Coupled outside intensity be adjusted to respectively the first passband coupled outside strength demand and the second passband coupled outside intensity need
It asks.
Optionally, the main body of the multimode resonator includes micro-strip interdigital capacitor and sinuous micro-strip, the multimode resonator
Loading section include blocky capacitor and sinuous micro-strip.
Optionally, on the coupling path that the need that the auxiliary coupling block is placed on the multimode resonator are reinforced or weakened.
Optionally, first branch of feeder line is used for the outer of the coupled outside intensity adjustment of the first passband to the first passband
Portion's stiffness of coupling demand, first branch of feeder line and the second branch of the feeder line are used for the coupled outside intensity of the second passband
It is adjusted to the coupled outside strength demand of the second passband.
Optionally, when the coupled outside of first passband is bridging type, first branch of feeder line is overlapped in first segment
The main body of multimode resonator, if the coupled outside of the second passband is capacitive coupling formula, feeder line the first branch capacitive coupling is in the
The main body of one section multimode resonator.
Optionally, lead to if the first branch of the feeder line is exactly equal to second in the stiffness of coupling that second passband is formed
The coupled outside intensity of band is then not provided with the second branch of feeder line；
If the stiffness of coupling that first branch of feeder line is formed in second passband is less than the external coupling of the second passband
Intensity is closed, then is with phase phase adding type feeder branch by second branch design of feeder line；
If first branch of feeder line is greater than the external coupling of the second passband in the stiffness of coupling that second passband is formed
Intensity is closed, then is reverse phase cancellation type feeder branch by second branch design of feeder line.
Optionally, the auxiliary coupling block is placed on the coupling path that the need of the multimode resonator are reinforced or weaken,
The coupling of the coupling path of position, size, shape and the open circuit of the auxiliary coupling block or the state of short circuit by that need to change is strong
The incrementss or reduction amount of degree determine.
Optionally, the working frequency of first passband is determined by the dimensional parameters of the main body of the multimode resonator, institute
The working frequency for stating the second passband is determined by the main body of the multimode resonator and the dimensional parameters of loading section.
Double-passband filter provided by the utility model, has the following beneficial effects:
Using the structure of the utility model, bandwidth may be implemented than great double-passband filter, two of filter
Band connection frequency and bandwidth can be customized freely, and spurious mode realizes that simply freedom degree is big, can be real far from two working passbands
Existing order is high, improves filtering performance, and the double-passband filter with big bandwidth ratio, and its corresponding dual-passband filter may be implemented
Wave body product is smaller, and filtering performance is more preferable, has broad application prospects.
Detailed description of the invention
Fig. 1 a and Fig. 1 b are the bandwidth of the utility model than multimode resonator used in great double-passband filter
Schematic diagram and frequency response curve；
Fig. 2 a and Fig. 2 b are the one-to-many mode resonator of the utility model and its formation strength difference is larger at two passbands
Coupling schematic diagram；
Fig. 3 is the bandwidth of the utility model than feeder line structure figure used in great double-passband filter；
Fig. 4 is the whole microstrip circuit figure of the 4 rank dual-passband super conductive filters of the utility model；
Fig. 5 is the passband frequency response figure of the 4 rank dual-passband super conductive filters of the utility model；
Fig. 6 is the broadband frequency response chart of the 4 rank dual-passband super conductive filters of the utility model.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
The technical issues of in order to solve in the prior art, the utility model provide a kind of double-passband filter.The present invention
Double-passband filter include several multimode resonators and several auxiliary coupling blocks, multimode resonator is to by double-passband filter
Working frequency be adjusted to corresponding frequencies, and the spurious mode frequency more than two times of multimode resonator is pushed into filter far from multi-pass band
At the frequency of wave device working passband, the stiffness of coupling of coupling path of the coupling block to change multimode resonator is assisted, specifically,
By adjusting the main body of multimode resonator and the dimensional parameters of loading section, main micro-strip interdigital capacitor including main part and
Sinuous micro-strip, the blocky capacitor of loading section and sinuous micro-strip size, to change the working frequency of double-passband filter, and will be more
The spurious mode frequency of mould resonator is pushed at the frequency far from comb filter working passband, especially will more than two times
Parasitic parasitic mode is pushed at the frequency far from working passband, changes multimode resonance by way of adjusting the auxiliary coupling block
The stiffness of coupling of the coupling path of device.
The main part of multimode resonator is made of micro-strip interdigital capacitor and sinuous micro-strip, and main part determines that first is logical
The loading section of the frequency of band, multimode resonator is made of blocky capacitor and sinuous micro-strip, and main part and loading section are common
Determine the frequency of the second passband.
Change the stiffness of coupling of the coupling path between multimode resonator by way of adjusting and assisting coupling block, specifically
Are as follows:
Auxiliary coupling block is placed on the coupling path that need between multimode resonator are reinforced or weakened, and assists coupling block
Position, size, shape and open circuit or the state of short circuit are determined by the incrementss or reduction amount of the coupling path that need to change.
The feeder line of double-passband filter includes the second branch of the first branch of feeder line and feeder line.When designing feeder line, first according to the
The coupled outside strength demand of one passband designs the first branch of feeder line.Coupled outside needed for second passband is divided by feeder line first
Branch and the second branch of feeder line provide jointly.After the first branch of feeder line determines, depending on the coupled outside strength demand of the second passband,
Design the second branch of feeder line.If the stiffness of coupling that the first branch of feeder line is formed at the second passband is smaller, need to design same
Phase phase adding type feeder branch, if the coupled outside intensity that the first branch of feeder line provides has been more than to need to set needed for the second passband
Count reverse phase cancellation type feeder branch.The specific configuration of feeder branch can be designed by electromagnetic simulation software.
Single-pass band filter design cycle is roughly divided into four big steps: 1, resonator element designs；2, it is coupled between resonator
Design；3, the coupled outside of first and last section resonator and input and output feeder line designs；4, global optimization.For comb filter,
It is exactly that each passband will consider these requirements simultaneously.Now by taking double-passband filter as an example, the multi-pass of the utility model is introduced
The composition of band filter.
One double-passband filter should include by dielectric substrate, positioned at the main line of dielectric substrate upper surface and positioned at medium
The microstrip circuit and packaging cartridge that the metal floor of substrate lower surface is constituted, main line should include resonator and input and output feeder line,
The preferred superconductor of microstrip circuit.
Fig. 1 a is a kind of schematic diagram of multimode resonator used in the double-passband filter of the utility model, and the multimode is humorous
Vibration device is made of resonator body and loading section, wherein resonator body 11 includes micro-strip interdigital capacitor and sinuous micro-strip, mesh
Be to raise spurious mode, loading section 12 includes wriggle micro-strip and blocky capacitor, they form Stepped Impedances, also for
Raise spurious mode.End is convenient using blocky capacitor simultaneously and adjacent resonators form passband two under auxiliary coupling block effect
Required close coupling.
Such as the frequency response chart that Fig. 1 b is the single multimode resonator after the optimization, wherein F1 and F2 is respectively multimode resonance
Minimum two frequencies (odd mould frequency and even mould frequency) of device, F1, F2 need to be respectively adjusted in the first passband and the second passband
Frequency of heart is the basis to form two passbands.Increase the interdigital capacitor of the main part of multimode resonator and the block of loading section
The parasitic resonance frequency of resonator can be pushed at the high-frequency far from F1, F2 that (difference i.e. with F1, F2 is greater than by shape capacitor
Predeterminated frequency difference threshold value), it avoids interfering with required working passband, influences filtering performance.An independent multimode resonator can be with shape
It at low order double-passband filter, but can only guarantee two regulable center frequency sections, if it is desired to bandwidth is adjustable, then to change coupling
Collaboration number, that means that the coupling distance for needing to change multimode resonator, but two passbands share a coupling distance, one
For a distance it is difficult to ensure that two bandwidth reach required intensity simultaneously, limitation is larger, therefore increases auxiliary coupling block, passes through adjusting
The form of the auxiliary coupling block carrys out the stiffness of coupling between each resonator of flexible modulation at two band connection frequencies.Auxiliary coupling
The form of block includes but is not limited to assist shape, position, size and open circuit or state of short circuit of coupling block etc..
Fig. 2 a is that two coupling multimode resonators increase the schematic diagram after auxiliary coupled structure, and two multimodes are shown
Resonator 1,2 and the combination for assisting coupling block 9.Fig. 2 b is that auxiliary coupling block regulates and controls lower two coupling multimode resonators
Frequency response chart, it can be seen that auxiliary coupled structure can be under conditions of keeping the first passband stiffness of coupling to be basically unchanged
Independently regulating and controlling the stiffness of coupling of the second passband to a wide range, (stiffness of coupling is bigger to show as frequency in frequency response curve
Bifurcated is more opened), to independently regulate and control the bandwidth of the second passband to a wide range.
In the design of double-passband filter, in addition to design resonator element design and coupled between resonator, it is also necessary to
Design the coupled outside of first and last section resonator and input and output feeder line.
As shown in figure 3, being the feeder line structure figure of double-passband filter input/output terminal, double-passband filter coupled outside is logical
Cross using double-fed cable architecture and realize, double-fed cable architecture by input/output port connection sub-miniature A connector the public micro-strip of 50 Ω and
It is constituted with two branch feeders.The first branch of feeder line L1 snaps into the suitable position of multimode resonator 1 to provide the first passband institute
Need coupled outside, the second branch of feeder line L2 then use with 1 coupled modes of first and last multimode resonator, coupled with loading section, with
L1 cooperates with coupled outside required for providing the second passband together.The configuration of the first branch of feeder line L1 is logical to the first passband and second
Band all has an impact, and the second branch of feeder line L2 mainly influences the second passband.Therefore, it is first required according to the coupled outside of the first passband
The size and lap position for designing the first branch of feeder line L1, then keep the size and position constant, and design feeder line second divides
Branch L2, to reach the requirement of the second passband coupled outside.If the coupled outside that L1 is provided is more than intensity needed for the second passband, L2
Reverse phase cancellation type branch need to be designed to provide intensity suitable coupled outside.
As shown in figure 4, be the passband of an embodiment of the present invention being 1565MHz-1585MHz and 2350-2550MHz
The microstripline figure of 4 rank dual-passband super conductive filters.The dual-passband superconducting filter includes 4 multimode resonator 1,2,3,4 and 3
It can change the " I " fonts auxiliary coupling block 9 of the stiffness of coupling of multimode resonator.Due to the influence of feeder line, first and last resonator 1,
4 size needs slightly to correct.Filter material therefor is YBCO/MgO high-temperature superconductor substrate, and substrate dielectric constant is 9.78,
With a thickness of 0.5mm.Resonator specific size is mainly determined by two band connection frequencies.CP1 indicates coupling path one, main covering filtering
The top half of device, the i.e. main part across each resonator, CP2 indicate coupling path two, the main lower half for covering filter
Part, the i.e. loading section across each resonator.Resonator inside needed for first passband couples mainly by the stiffness of coupling on CP1
It determines, and the coupling of resonator inside needed for the second passband is mainly codetermined by the stiffness of coupling on CP1 and CP2.Multimode is humorous
The distance of vibration device determines in the stiffness of coupling needed for two passbands compared with weak person, strong compared with close coupling in order to meet another passband
The demand of degree places auxiliary coupling block on the passband coupling path of the required change of multimode resonator, assists the ruler of coupling block
The very little incrementss by required stiffness of coupling determine.It, can be by full-wave simulation software when determining to assist coupling block size
SONNET is carried out.Auxiliary coupling block 9 can be the microstrip line of auxiliary adjustment resonator stiffness of coupling, small-sized, can cause to filter
The small offset of the resonance frequency of wave device main body, this offset need to make small amendment in filter global optimization.
If Fig. 5 be 4 rank dual-passband super conductive filters frequency response chart, as seen from the figure, the centre frequency of two passbands and
Bandwidth has reached scheduled design objective, and realizing two band connection frequencies may customize, and bandwidth ratio reaches 10 times of magnitudes.
As shown in fig. 6, being the frequency response chart of the 4 rank dual-passband super conductive filters containing parasitic passband, with ectoparasite logical
Band is pulled to the position far from required dual-passband, is other than 6.2GHz in this example.
Double-passband filter provided by the utility model, has the following beneficial effects:
Using the structure of the utility model, bandwidth may be implemented than great double-passband filter, two of filter
Band connection frequency and bandwidth can be customized freely, and spurious mode realizes that simply freedom degree is big, can be real far from two working passbands
Existing order is high, improves filtering performance, and the double-passband filter with big bandwidth ratio, and its corresponding multi-pass band filter may be implemented
Wave body product is smaller, and filtering performance is more preferable, has broad application prospects.
In this description, the utility model is described with reference to its specific embodiment.But it is clear that still can be with
The spirit and scope that various modification can be adapted and converts without departing from the utility model.Therefore, the description and the appended drawings should be considered as
It is illustrative and not restrictive.
Claims (8)
1. a kind of double-passband filter, which is characterized in that including multiple multimode resonators, multiple auxiliary coupling blocks and feeder line, institute
Stating feeder line includes the second branch of the first branch of feeder line and feeder line, and the multimode resonator includes main body and loading section；
The multimode resonator is used to the working frequency of double-passband filter being adjusted to preset working frequency, and by dual-passband
The spurious mode frequency of filter is adjusted to preset spurious mode frequency range；
The stiffness of coupling of coupling path of the auxiliary coupling block for changing the multimode resonator；
First branch of feeder line and the second branch of feeder line are used for the outer of the coupled outside intensity of the first passband and the second passband
Portion's stiffness of coupling is adjusted to the coupled outside strength demand of the first passband and the coupled outside strength demand of the second passband respectively.
2. double-passband filter according to claim 1, which is characterized in that the main body of the multimode resonator includes micro-strip
Interdigital capacitor and sinuous micro-strip, the loading section of the multimode resonator include blocky capacitor and sinuous micro-strip.
3. double-passband filter according to claim 2, which is characterized in that the auxiliary coupling block is placed on the multimode
On the coupling path that the need of resonator are reinforced or weakened.
4. double-passband filter according to claim 1, which is characterized in that first branch of feeder line by first for leading to
Coupled outside strength demand of the coupled outside intensity adjustment of band to the first passband, first branch of feeder line and the feeder line
Two branches are used for the coupled outside strength demand of the coupled outside intensity adjustment of the second passband to the second passband.
5. double-passband filter according to claim 4, which is characterized in that the coupled outside of first passband is overlap joint
When formula, first branch of feeder line is overlapped in the main body of first segment multimode resonator, if the coupled outside of the second passband is to hold
Property manifold type, feeder line the first branch capacitive coupling is in the main body of first segment multimode resonator.
6. double-passband filter according to claim 4, which is characterized in that if the first branch of the feeder line is described
The stiffness of coupling that two passbands are formed is exactly equal to the coupled outside intensity of the second passband, then is not provided with the second branch of feeder line；
If the stiffness of coupling that first branch of feeder line is formed in second passband is strong less than the coupled outside of the second passband
Second branch design of feeder line is then with phase phase adding type feeder branch by degree；
If first branch of feeder line is strong in the coupled outside that the stiffness of coupling that second passband is formed is greater than the second passband
Second branch design of feeder line is then reverse phase cancellation type feeder branch by degree.
7. double-passband filter according to claim 1, which is characterized in that reinforce or subtract in the need of the multimode resonator
The auxiliary coupling block, position, size, shape and the open circuit or short circuit of the auxiliary coupling block are placed on weak coupling path
State by the coupling path that need to change stiffness of coupling incrementss or reduction amount determine.
8. double-passband filter according to claim 7, which is characterized in that the working frequency of first passband is by described
The dimensional parameters of the main body of multimode resonator determine, the working frequency of second passband by the multimode resonator main body and
The dimensional parameters of loading section determine.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276779A (en) * | 2020-02-19 | 2020-06-12 | 中天宽带技术有限公司 | Microstrip low-pass filter |
| CN111326836A (en) * | 2020-03-02 | 2020-06-23 | 清华大学 | Y-shaped interdigital capacitance adjustable coupling structure and superconducting filter |
-
2019
- 2019-01-22 CN CN201920103682.7U patent/CN209374636U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276779A (en) * | 2020-02-19 | 2020-06-12 | 中天宽带技术有限公司 | Microstrip low-pass filter |
| CN111326836A (en) * | 2020-03-02 | 2020-06-23 | 清华大学 | Y-shaped interdigital capacitance adjustable coupling structure and superconducting filter |
| CN111326836B (en) * | 2020-03-02 | 2021-07-06 | 清华大学 | Y-shaped interdigital capacitance adjustable coupling structure and superconducting filter |
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