CN108258372B - The method and comb filter of independent regulation comb filter frequency and bandwidth - Google Patents
The method and comb filter of independent regulation comb filter frequency and bandwidth Download PDFInfo
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- CN108258372B CN108258372B CN201810034811.1A CN201810034811A CN108258372B CN 108258372 B CN108258372 B CN 108258372B CN 201810034811 A CN201810034811 A CN 201810034811A CN 108258372 B CN108258372 B CN 108258372B
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/088—Tunable resonators
Abstract
The present invention relates to the methods of a kind of independent regulation comb filter frequency and bandwidth, including one or several multimode resonators and one or several auxiliary coupling blocks, change the working frequency of comb filter by the main body and the size of loading section that adjust multimode resonator, and make parasitic passband far from required working passband, change the stiffness of coupling of the coupling path between multimode resonator by adjusting position and the size of auxiliary coupling block；The present invention also provides a kind of comb filters, and wherein the working frequency of comb filter is adjusted to corresponding frequencies by multimode resonator, assist coupling block for changing the stiffness of coupling of the coupling path between multimode resonator.Using method of the invention, so that the frequency of independent regulation comb filter and the simple operation of bandwidth, freedom degree is big, and the comb filter of high performance high order may be implemented, and its corresponding comb filter volume is smaller, has broad application prospects.
Description
Technical field
The present invention relates to microwave technical field more particularly to wave filter technology field, in particular to a kind of independent regulation are more
The method and comb filter of pass filter frequency and bandwidth.
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-mode 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) comb filter can be realized bandstop filter being cascaded or being embedded in bandpass filter.In simple terms,
It is certain specific frequency ranges to be filtered off in a wider passband using bandstop filter, and then a passband before being allowed to becomes
Multiple passbands form 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.Associated with each other between multiple passbands, influence, so that designer is difficult to find one group of physical parameter,
So that the filter response of each passband all reaches most preferably, therefore generally requires to be accepted or rejected between each passband, to reach whole
Body filtering performance it is best.
Therefore, it realizes the comb filter that frequency and bandwidth freely can independently regulate and control, has urgent demand, but deposit
In great design difficulty, to realize the High-Order Multi-Band-Pass Filters for meeting above-mentioned requirements, then it is even more extremely difficult.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provide a kind of by adjusting multimode resonator
The position and size of electrical length and impedance ratio and auxiliary coupling block can be realized the independent tune that frequency and bandwidth can freely regulate and control
Control the method and comb filter of comb filter frequency and bandwidth.
To achieve the goals above, the method and multi-pass band of independent regulation comb filter frequency and bandwidth of the invention
Filter has following constitute:
A method of the frequency and bandwidth of independent regulation comb filter are mainly characterized by, the multimode is humorous
Vibration device includes main body and loading section, is changed by the main body and each section of size of loading section that adjust the multimode resonator
Become the working frequency of the comb filter, and the spurious mode frequency of the multimode resonator is pushed into far from described
Comb filter working frequency at, change the multimode resonance by way of adjusting the auxiliary coupling block
The stiffness of coupling of coupling path between device.
Further, each section of size of the main body and loading section by adjusting the multimode resonator changes
Become the working frequency of the comb filter, and the spurious mode frequency of the multimode resonator is pushed into far from described
Comb filter working frequency at, specifically:
By the electrical length for adjusting the main body of multimode resonator and the high impedance section of loading section and Low ESR section
And impedance ratio changes the working frequency of the comb filter, and by the spurious mode frequency of the multimode resonator
It is pushed at the working frequency far from the comb filter.
Further, the main body is Stepped Impedance type resonator body, and the loading section is loads on
The Stepped Impedance type minor matters in Stepped Impedance type resonator body stated, the Stepped Impedance type minor matters include high impedance minor matters
Section and Low ESR minor matters section, the Stepped Impedance type resonator body includes high impedance microstrip line and Low ESR microstrip line, institute
The high impedance section stated includes the high impedance microstrip line and the high impedance minor matters section, and the Low ESR section includes described
Low ESR microstrip line and the Low ESR minor matters section.
Further, change the coupling between the multimode resonator by way of adjusting the auxiliary coupling block
It is combined the stiffness of coupling of diameter, specifically:
The auxiliary coupling block is placed on the coupling path that need in the multimode resonator are reinforced or weakened, it is described
Position, size, shape and the open circuit of auxiliary coupling block or the coupling of coupling path that is changed by the need of the state of short circuit
The incrementss or reduction amount of intensity determine.
Wherein, the auxiliary coupling block be the open circuit that can be placed on the coupling path of the multimode resonator or
Short-circuit micro-band line.
The present invention also provides a kind of method designs of frequency and bandwidth based on above-mentioned independent regulation comb filter
Comb filter is mainly characterized by, the comb filter include one or several multimode resonators and one or
Several auxiliary coupling blocks, the multimode resonator is to be adjusted to respective tones for the working frequency of the comb filter
Rate, and the spurious mode frequency of multimode resonator is pushed at the frequency far from comb filter working passband, described is auxiliary
Help stiffness of coupling of the coupling block to change the coupling path between the multimode resonator.
Further, the multimode resonator includes high impedance section and Low ESR section.
Further, the high impedance section of the multimode resonator is by folding.
Wherein, the multimode resonator includes Stepped Impedance type resonator body and loads on the Stepped Impedance type
Stepped Impedance type minor matters in resonator body.The Stepped Impedance type minor matters include high impedance minor matters section and Low ESR minor matters
Section, the Stepped Impedance type resonator body includes high impedance microstrip line and Low ESR microstrip line, the high impedance section packet
Including the high impedance microstrip line and the high impedance minor matters section, the Low ESR section includes the Low ESR microstrip line
With the Low ESR minor matters section.
Further, the Stepped Impedance type minor matters load in the Stepped Impedance type resonator body
Portion；The auxiliary coupling block is placed on the coupling path of the multimode resonator；The entirety of the multimode resonator
Structure bilateral symmetry.
Using the method for independent regulation comb filter frequency and bandwidth of the invention, by changing comb filtering
The main body of the multimode resonator of device and the size of loading section adjust the higher order resonances mode distribution of resonator, to influence height
Parasitic resonance frequency；By the position and the size that change the distance between multimode resonator and auxiliary coupling block, thus it is possible to vary more
The stiffness of coupling of two coupling paths of mould resonator, so that flexible modulation bandwidth, more using comb filter of the invention
The high impedance section of mould resonator and the electrical length and impedance ratio of Low ESR section can be such that the working frequency of comb filter adjusts
It is pushed into corresponding frequencies, and by parasitic parasitic mode far from working passband frequency range, auxiliary coupling block changes the coupling road of multimode resonator
The high impedance section part of the stiffness of coupling of diameter, multimode resonator is folded, and the volume of filter is reduced, this independently regulates and controls more
The frequency of pass filter and the method for bandwidth are easy to operate, and freedom degree is big, and the multi-pass band of high performance high order may be implemented
Filter, and its corresponding comb filter volume is smaller, has broad application prospects.
Detailed description of the invention
Fig. 1 is the flow chart of the frequency of independent regulation comb filter of the invention and the method for bandwidth.
Fig. 2 is a kind of schematic diagram of multimode resonator used in comb filter of the invention.
Fig. 3 is the frequency response chart of the multimode resonator after optimization of the invention.
Fig. 4 is the feeder line structure figure of double-passband filter input/output terminal of the invention.
Fig. 5 is the main line figure of 6 rank dual-passband super conductive filters of the invention.
Fig. 6 is the frequency response chart of 6 rank dual-passband super conductive filters of the invention.
Fig. 7 is the wideband response figure of the 6 rank dual-passband super conductive filters of the invention containing parasitic passband.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
As shown in Figure 1, the flow chart of the method for the frequency and bandwidth of independent regulation comb filter of the invention.It is more
Pass filter includes one or several multimode resonators and one or several auxiliary coupling blocks, by adjusting multimode resonator
The dimensional parameters of main body and loading section, main includes the electrical length and impedance ratio of high impedance section and Low ESR section, more to change
The working frequency of pass filter, and the spurious mode frequency of multimode resonator is pushed into far from comb filter working passband
Frequency at, change the stiffness of coupling of the coupling path of multimode resonator by way of adjusting the auxiliary coupling block.
The main body of multimode resonator is Stepped Impedance type resonator body, and loading section is to load on the Stepped Impedance
Stepped Impedance type minor matters in type resonator body, Stepped Impedance type minor matters include high impedance minor matters section and Low ESR minor matters section,
Stepped Impedance type resonator body includes high impedance microstrip line and Low ESR microstrip line, high impedance section include high impedance microstrip line and
High impedance minor matters section, Low ESR section include Low ESR microstrip line and Low ESR minor matters section.
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.
Wherein, the auxiliary coupling block is the micro-strip that can be placed on the coupling path of the multimode resonator
Line.
The present invention also provides a kind of method designs of frequency and bandwidth based on above-mentioned independent regulation comb filter
Comb filter, comb filter include one or several multimode resonators and one or several auxiliary coupling blocks, multimode
Resonator is to be adjusted to corresponding frequencies for the working frequency of comb filter, and by the spurious mode frequency of multimode resonator
It is pushed at the frequency far from comb filter working passband, is especially pushed into parasitic parasitic mode more than two times logical far from work
At the frequency of band, the stiffness of coupling of coupling path of the coupling block to change multimode resonator is assisted.
Single-pass band filter design cycle is roughly divided into four big steps: 1. resonator elements design；2. being 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, multi-pass band filter of the invention is introduced
The composition of wave device.
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. 2 is a kind of schematic diagram of multimode resonator used in comb filter of the invention, the multimode resonator
It is made of the minor matters 2 that half-wave resonator main body 1 and middle part load, wherein the branch of half-wave resonator main body 1 and middle part load
Section 2 is all Stepped Impedance type structure, it is therefore an objective to spurious mode is raised, minor matters 2 include high impedance minor matters section and Low ESR minor matters section,
Half-wave resonator main body 1 includes high impedance microstrip line and Low ESR microstrip line.High impedance section includes half-wave resonator main body 1
High impedance microstrip line and minor matters 2 high impedance minor matters section, Low ESR section includes the Low ESR micro-strip of half-wave resonator main body 1
The Low ESR minor matters section of line and minor matters 2.The high impedance section of half-wave resonator main body 1 is further folded, high impedance section can be with
It is the high impedance section of half-wave resonator main body 1, is also possible to the high impedance section of minor matters 2, with size reduction.Multimode after optimization
The structure of resonator symmetrically, can be analyzed to obtain suitable impedance ratio using analysis method of odd-even model in the horizontal plane
And electrical length.
As shown in figure 3, wherein F1 and F2 is respectively odd mould and idol for the frequency response chart of the multimode resonator after the optimization
The fundamental frequency of mould, F1, F2 need to be respectively adjusted to the centre frequency of the first passband and the second passband, be the base to form two passbands
Plinth.F3 and F4 is secondary resonance mode corresponding with F1, F2 respectively.Impedance ratio is mainly by the width of high impedance section and Low ESR section
Than determining, electrical length is the physical length and the ratio between transmitted electromagnetic wavelength of microstrip line, and high Low ESR section impedance ratio and electricity are long
Higher order resonances mode distribution of the degree than affecting resonator.The impedance ratio for increasing multimode resonator can raise spurious resonance frequency
F3 and F4, can be pushed away the high-frequency for being moved away from F2 by rate, therefore the impedance ratio of adjusting multimode resonator and corresponding electrical length
Place, avoids interfering with passband, influences filtering performance.An independent multimode resonator can form low order double-passband filter, but
It is that can only guarantee two regulable center frequency sections, if it is desired to bandwidth is adjustable, then changes the coefficient of coup, that means that needs
Change the coupling distance of multimode resonator, but two passbands share a coupling distance, a distance is it is difficult to ensure that two bands
Wide to reach required intensity simultaneously, limitation is larger, therefore increases auxiliary coupling block, by the shape for adjusting the auxiliary coupling block
Formula carrys out the stiffness of coupling between each resonator of flexible modulation at two band connection frequencies.Auxiliary coupling block form include but is not limited to
Assist shape, position, size and open circuit or the state of short circuit etc. of coupling block.
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 4, 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.It is outer needed for the first passband to provide that branch feeder L1 snaps into the suitable position of multimode resonator
Portion coupling, branch feeder L2 then use with first and last multimode resonator coupled modes, with load minor matters section couple, cooperateed with together with L1
Coupled outside required for second passband is provided.The configuration of branch feeder L1 all has an impact to the first passband and the second passband, and
Branch feeder L2 mainly influences the second passband, therefore, is first required to design branch feeder L1 according to the coupled outside of the first passband
Size and lap position, then keep the size and position constant, adjust branch feeder L2 geometric dimension, to reach second
The requirement of passband coupled outside.
As shown in figure 5, to be 3300-3600MHz according to the passband that the above method designs and 6 ranks of 4800-5000MHz pair
The main line figure of passband super conductive filter.The dual-passband superconducting filter includes that 6 multimode resonators 3 and 6 can change multimode
The auxiliary coupling block 4 of the stiffness of coupling of resonator.Filter material therefor is YBCO/MgO high-temperature superconductor substrate, and substrate dielectric is normal
Number is 9.78, and with a thickness of 0.5mm, the electrical length of high Low ESR section and impedance ratio are then according to the frequency of two passbands on multimode resonator
Rate is obtained by software emulation or theoretical calculation.CP1 indicates that coupling path one, CP2 indicate coupling path two.Needed for passband 1
Resonator inside coupling is mainly determined by the stiffness of coupling on CP1, and the coupling of resonator inside needed for passband 2 is mainly by CP1
It is codetermined with the stiffness of coupling on CP2.The distance of multimode resonator is determined in the stiffness of coupling as needed for two passbands compared with weak person
It is fixed, in order to make another passband meet the needs of compared with close coupling intensity, road is coupled in the passband of the required change of multimode resonator 3
Auxiliary coupling block 4 is placed on diameter, multimode resonator 3 and auxiliary coupling block 4 have no direct contact, assist coupling block 4 position and
Size is determined by the amount of required stiffness of coupling increased or decreased, and changes the distance between multimode resonator 3 and auxiliary coupling block 4
Position and size, thus it is possible to vary the stiffness of coupling of two coupling paths of multimode resonator.It is determining to assist 4 position of coupling block
When with size, it can be carried out by full-wave simulation software SONNET.It is strong that auxiliary coupling block 4 can be the coupling of auxiliary adjustment resonator
The open circuit or short-circuit micro-band line of degree, it is small-sized, it is little on the influence of the resonance frequency of filter main body, and also this influence is being filtered
It is accounted for when wave device global optimization, such as the frequency response chart that Fig. 6 is 6 rank dual-passband super conductive filters, as seen from the figure, two logical
The centre frequency and bandwidth of band reached scheduled design objective, it was demonstrated that the frequency and bandwidth that this method is proposed can from
By the feasibility independently regulated and controled.
As shown in fig. 7, being the frequency response chart of the 6 rank dual-passband super conductive filters containing parasitic passband, use above-mentioned
The dual-passband super conductive filter of method design is pulled to the position far from required dual-passband with ectoparasite passband, is in this example
Other than 13GHz.If not having to the Stepped Impedance type resonator of above-mentioned optimization, the position of parasitic passband can be relatively required
Two useful passbands, will affect performance of filter.
Using the method for independent regulation comb filter frequency and bandwidth of the invention, by changing comb filtering
The main body of the multimode resonator of device and the size of loading section adjust the higher order resonances mode distribution of resonator, to influence height
Parasitic resonance frequency；By the position and the size that change the distance between multimode resonator and auxiliary coupling block, thus it is possible to vary more
The stiffness of coupling of two coupling paths of mould resonator, so that flexible modulation bandwidth, more using comb filter of the invention
The high impedance section of mould resonator and the electrical length and impedance ratio of Low ESR section can be such that the working frequency of comb filter adjusts
To corresponding frequencies, and make parasitic passband far from working passband, coupling block is assisted to change the coupling of the coupling path of multimode resonator
The high impedance section part of intensity, multimode resonator is folded, and reduces the volume of filter, this independently regulates and controls comb filtering
The frequency of device and the method for bandwidth are easy to operate, and freedom degree is big, and order is high, improve filtering performance, and its corresponding multi-pass band
Filter volume is smaller, and output is more stable, and filtering performance is more preferable, has broad application prospects.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (11)
1. a kind of method of the frequency and bandwidth of independent regulation comb filter, which is characterized in that the comb filtering
Device includes one or several multimode resonators and one or several auxiliary coupling blocks, and the multimode resonator includes main body and adds
Part is carried, is filtered by the main body of the adjusting multimode resonator and each section of size of loading section to change the multi-pass band
The working frequency of wave device, and the spurious mode frequency of the multimode resonator is pushed into far from the comb filter
At working frequency, change the coupling path between the multimode resonator by way of adjusting the auxiliary coupling block
Stiffness of coupling,
Wherein, the main body is Stepped Impedance type resonator body, and the loading section is to load on the step resistance
Stepped Impedance type minor matters in anti-type resonator body,
Change the coupling of the coupling path between the multimode resonator by way of adjusting the auxiliary coupling block
Intensity, specifically: the auxiliary coupling is placed on the coupling path that the need between the multimode resonator are reinforced or weakened
Close block, the coupling road that position, size, shape and the open circuit of auxiliary coupling block or the state of short circuit are changed by the need
The incrementss or reduction amount of the stiffness of coupling of diameter determine.
2. the method for the frequency and bandwidth of independent regulation comb filter according to claim 1, which is characterized in that institute
Each section of size of the main body and loading section by adjusting the multimode resonator stated changes the comb filtering
The working frequency of device, and the spurious mode frequency of the multimode resonator is pushed into the work far from the comb filter
At working frequency, specifically:
By the electrical length and resistance that adjust the main body of multimode resonator and the high impedance section of loading section and Low ESR section
It is anti-than come the working frequency that changes the comb filter, and the spurious mode frequency of the multimode resonator is pushed into
At working frequency far from the comb filter.
3. the method for the frequency and bandwidth of independent regulation comb filter according to claim 2, which is characterized in that institute
The Stepped Impedance type minor matters stated include high impedance minor matters section and Low ESR minor matters section, the Stepped Impedance type resonator body packet
High impedance microstrip line and Low ESR microstrip line are included, the high impedance section includes the high impedance microstrip line and the high resistant
Anti- minor matters section, the Low ESR section include the Low ESR microstrip line and the Low ESR minor matters section.
4. the method for the frequency and bandwidth of independent regulation comb filter according to claim 1, which is characterized in that institute
The auxiliary coupling block stated is the open circuit that can be placed on the coupling path of the multimode resonator or short-circuit micro-band line.
5. a kind of side of frequency and bandwidth based on independent regulation comb filter described in any one of Claims 1-4
Method design comb filter, which is characterized in that the comb filter include one or several multimode resonators and
One or several auxiliary coupling blocks, the multimode resonator is the working frequency of the comb filter to be adjusted to
Corresponding frequencies, and the spurious mode frequency of the multimode resonator is pushed into the work frequency far from the comb filter
At rate, stiffness of coupling of the auxiliary coupling block to change the coupling path between the multimode resonator.
6. comb filter according to claim 5, which is characterized in that the multimode resonator includes high impedance section
With Low ESR section, the high impedance section of the multimode resonator is by folding.
7. comb filter according to claim 6, which is characterized in that the multimode resonator includes Stepped Impedance
Type resonator body and load on the Stepped Impedance type minor matters in the Stepped Impedance type resonator body.
8. comb filter according to claim 7, which is characterized in that the Stepped Impedance type minor matters include high resistant
Anti- minor matters section and Low ESR minor matters section, the Stepped Impedance type resonator body includes high impedance microstrip line and Low ESR micro-strip
Line, the high impedance section include the high impedance microstrip line and the high impedance minor matters section, the Low ESR section packet
Include the Low ESR microstrip line and the Low ESR minor matters section.
9. comb filter according to claim 8, which is characterized in that the Stepped Impedance type minor matters load on institute
The middle part for the Stepped Impedance type resonator body stated.
10. comb filter according to claim 5, which is characterized in that the auxiliary coupling block is placed in described
Multimode resonator coupling path on.
11. comb filter according to claim 5, which is characterized in that the overall structure of the multimode resonator
Symmetrically.
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