CN107093785B - Multimode resonator and filter thereof - Google Patents
Multimode resonator and filter thereof Download PDFInfo
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- CN107093785B CN107093785B CN201710193076.4A CN201710193076A CN107093785B CN 107093785 B CN107093785 B CN 107093785B CN 201710193076 A CN201710193076 A CN 201710193076A CN 107093785 B CN107093785 B CN 107093785B
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Classifications
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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
- H01P7/082—Microstripline resonators
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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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
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Abstract
The invention belongs to the technical field of wireless communication, and relates to a multimode resonator and a filter thereof. The multimode resonator comprises an annular transmission line, a first open circuit transmission line, a second open circuit transmission line, a third open circuit transmission line, a fourth open circuit transmission line and a fifth open circuit transmission line; wherein the open transmission lines are symmetrically installed on the ring transmission line, and the fourth open transmission line and the fifth open transmission line are coupled to each other with the ring transmission line. The filter adds a pair of T-shaped filter feed lines to the multimode resonator. The invention has the characteristics of high selectivity, small area and flexible adjustment of relative positions of double frequency bands.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of multimode resonator and its filter.
Background technique
What is wirelessly communicated is widely available, promotes the development of circuit engineering.Broadband and multi-mode communication system require circuit mould
Block and element have multifrequency and wide band frequency characteristics, and on the other hand, mobile device requires circuit module occupied area and volume to get over
Small better, Miniaturization Design is also main trend.Therefore, multiband filter especially filter has obtained extensive research.In
The structure of two kinds of mainstream double frequency filters, main implementation following two side are proposed in all kinds of patents and scientific documents
Formula, one are as follows: apply multiple singlemode resonance devices, design two conventional single band filters, realized by unified feed port
Double frequency filtering characteristic；The second way, using single multimode resonator, multimode resonator can generate multiple modes of resonance, and one
As for filter need to generate the multimode resonator of four modes of resonance and constitute, and the resonance frequency of this four modes can be only
Vertical control.First way due to two resonator independence, on the one hand can with the characteristic of separately adjustable each frequency band, but
It is that the combining form of another aspect filter also results in that circuit area is bigger than normal, is unfavorable for the small light of communication system；Second
Kind mode can obtain more compact filter band logical, but multiple model comparisions that multimode resonator generates are difficult to independent control
Band ratio the centre frequency of the first copper strips (centre frequency of the second passband divided by) adjustable extent of system, two frequency bands generally all compares
It is smaller, it limits its application.
The constituted mode of multimode resonator include stepped impedance load branch it is linear, it is annular, couple linear, patch shape etc..
Various structures have a superiority and inferiority, for example stepped impedance load shape parasitic harmonic wave frequency is more, and adjustable range is limited；Patch shape area it is big and
It is difficult to obtain the closed design method of filter design；Single transmission zero can only generally be introduced by coupling between linear two passbands
Point, passband isolation are bad；Mono- wavelength of annular multimode resonator Zhou Changwei, and selectivity is poor, adjusts passband central frequency
It adjusts inflexible.
Therefore one kind is needed both to keep small circuit area, pass-band performance can be adjusted independently, and can be obtained preferable logical
Filter with isolation.
Summary of the invention
In order to solve the above problems existing in the present technology, the present invention provides a kind of annular multimode resonator and its double frequencies
Band filter, the technical issues of to solve double frequency filter area in the prior art big, poor selectivity.
The technical scheme adopted by the invention is as follows: a kind of multimode resonator, including circular transmission line and the first open circuit are provided
Transmission line, the second open circuited transmission line, third open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line；Wherein, described
Open circuited transmission line is mounted on the circular transmission line using the center line of the circular transmission line as axis is symmetrical, and its
Symmetrical 4th open circuited transmission line of middle a pair and the 5th open circuited transmission line intercouple with the circular transmission line.
Preferably, the circular transmission line is by the 6th transmission line, the 7th transmission line, the 8th transmission line and the 9th transmission line structure
At four sections of transmission lines join end to end.
Preferably, the first open circuited transmission line load is opened in the joint of the 6th transmission line and the 7th transmission line, second
The load of road transmission line in the joint of the 9th transmission line and the 6th transmission line, the load of third open circuited transmission line in the 7th transmission line and
The joint of 8th transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line are all loaded to be transmitted in the 8th transmission line and the 9th
Line joint.
Preferably, the symmetrical structure of the multimode resonator is located at each symmetrical open circuit of symmetrical center line two sides
The characteristic impedance of transmission line and electrical length difference are identical, and are located at the characteristic impedance of each balanced pair of symmetrical center line two sides
It is also identical respectively with electrical length.
Preferably, the 4th open circuited transmission line intercouples with the six, the 9th transmission lines, the 5th open circuited transmission line and
Seven, the 8th transmission line intercouples, and the coefficient of coup of coupled structure is identical at two.
The present invention also provides a kind of filter, the input and output feed line of the connection multimode resonator of the filter is one
To T shape feed line；The multimode resonator circular transmission line and the first open circuited transmission line, the second open circuited transmission line, third open circuit
Transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line are constituted；Wherein, the open circuited transmission line is with the circular transmission line
Center line be that axis is symmetrical is mounted on the circular transmission line, and one pair of them the symmetrical described 4th are opened
Road transmission line and the 5th open circuited transmission line intercouple with the circular transmission line.
Preferably, the pair of T shape feed line includes: the first T shape feed line, including the tenth open circuited transmission line, the 11st
Open circuited transmission line, the 12nd transmission line；Tenth open circuited transmission line, the 11st open circuited transmission line and the 12nd transmission line port 2 three
Person connects, and the 12nd transmission line port 1 is used as signal input port；11st, the 12nd open circuited transmission line and the 4th open circuit pass
Defeated line intercouples, and constitutes the input signal access of filter；2nd T shape feed line, including the 13rd open circuited transmission line, the tenth
Four open circuited transmission lines, the 15th transmission line；13rd open circuited transmission line, the 14th open circuited transmission line and the 15th transmission line port
2 threes connect, and the 15th transmission line port 1 is used as signal output port；13rd, the 14th open circuited transmission line and the 5th open circuit
Transmission line intercouples, and constitutes the output signal access of filter.
Preferably, the pair of T shape feed line is distributed in the both sides of the multimode resonator, and passes about the annular
The center line of defeated line is axis bilateral symmetry.
Preferably, the circular transmission line is by the 6th transmission line, the 7th transmission line, the 8th transmission line and the 9th transmission line structure
At four sections of transmission lines join end to end.
Preferably, the first open circuited transmission line load is in the joint of the 6th transmission line and the 7th transmission line, institute
The load of the second open circuited transmission line is stated in the joint of the 9th transmission line and the 6th transmission line, the third open circuited transmission line adds
It is loaded in the joint of the 7th transmission line and the 8th transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line all add
It is loaded in the 8th transmission line and the 9th transmission line joint.
Preferably, the multimode resonator is located at each symmetrical open circuited transmission line of the center line two sides of the circular transmission line
Characteristic impedance and electrical length difference it is identical, and be located at the circular transmission line center line two sides each balanced pair spy
It levies impedance and electrical length is also identical respectively.
Preferably, the 4th open circuited transmission line intercouples with the six, the 9th transmission line, and the 5th open circuit passes
Defeated line intercouples with the seven, the 8th transmission line, and the coefficient of coup of coupled structure is identical at two.
The invention has the benefit that 1, multimode resonator of the invention is due to using open circuited transmission line and annular delivery
Coupling between line motivates four intrinsic cavity modes, and introduces two additional transmission zeros, improves filter
Frequency selectivity；2, filter of the invention uses input and output of the toroidal cavity resonator using a pair of of T shape feed line as resonator
Feed line, so that the filter area is smaller, double frequency-band relative position adjusts more flexible.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the toroidal cavity resonator that the embodiment of the present invention 1 provides；
Fig. 2 is the structural schematic diagram for the dual frequency filter that the embodiment of the present invention 2 provides；
Fig. 3 is the equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 provides；
Fig. 4 is the odd mould resonance equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 provides；
Fig. 5 is the even mould resonance equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 provides；
Fig. 6 is the toroidal cavity resonator resonance frequency f that the embodiment of the present invention 2 provideso2/fo1, fe2/fo1, fe1/fo1With θb's
Change curve；
Fig. 7 is the parameter weak coupling of C=0 and C ≠ 0 input scattering parameter in the toroidal cavity resonator of the offer of the embodiment of the present invention 2
Simulation result comparison diagram；
Fig. 8 be the toroidal cavity resonator that the embodiment of the present invention 2 provides transmission zero and pole it is bent with the variation of coefficient of coup C
Line chart；
Fig. 9 is that the dual frequency filter weak coupling that the embodiment of the present invention 2 provides inputs three kinds of typical speckle parameters simulation knots
Fruit figure；
Figure 10 is the simulation results figure for the dual frequency filter that the embodiment of the present invention 3 provides.
Specific embodiment
The present invention provides a kind of annular multimode resonator and its dual frequency filter, to solve double frequency filter in the prior art
The technical issues of wave device area is big, poor selectivity.
In order to solve the above technical problems, general thought is as follows for technical solution in the embodiment of the present application: by providing one
Kind occupy the small annular multimode resonator of circuit area, by circular transmission line and the first open circuited transmission line, the second open circuited transmission line,
Third open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line are constituted.Its open circuited transmission line is symmetrically mounted at ring
On shape transmission line, and the 4th open circuited transmission line and the 5th open circuited transmission line intercouple with circular transmission line.Due to introducing
Coupling between open circuited transmission line and circular transmission line motivates four intrinsic cavity modes, to constitute two of filter
Frequency band, and extra transmission zero is introduced, filter frequencies selectivity is improved, to construct based on the toroidal cavity resonator
Selectivity is high, and passband central frequency can be with freely regulated double frequency filter structure.
In order to better understand the above technical scheme, below by attached drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the absence of conflict, the embodiment of the present invention and embodiment
In technical characteristic can be combined with each other.
Embodiment 1
As shown in Figure 1, including circular transmission line and the first open circuited transmission line, the present embodiment provides a kind of multimode resonator
Two open circuited transmission lines, third open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line constitute toroidal cavity resonator；Its
The connection type of middle circular transmission line and the first, second, third, fourth, the 5th open circuited transmission line is axially symmetric structure, about
The center line of circular transmission line is symmetrical, and wherein opens in symmetrically a pair of of open circuited transmission line such as the 4th open circuited transmission line and the 5th
Road transmission line intercouples with circular transmission line.It (is with reference to frequency with the first passband central frequency with mono- wavelength of traditional Zhou Changwei
Rate) toroidal cavity resonator compare, toroidal cavity resonator of the invention be half wavelength, effectively reduce circuit area.
Be preferably carried out mode as one kind, circular transmission line by the 6th transmission line, the 7th transmission line, the 8th transmission line and
9th transmission line is constituted, and four sections of transmission lines join end to end.Specifically, the port 2 of i.e. the 6th transmission line and the end of the 7th transmission line
Mouthful 1 it is connected, the port 1 of the 7th transmission line port 2 and the 8th transmission line connects, the port 2 of the 8th transmission line and the 9th transmission line
Port 1 connects, and the 9th transmission line port 2 and the 6th transmission line port 1 connect.
Embodiment as a further preference, open circuited transmission line are symmetrically mounted on circular transmission line, specifically,
The load of first open circuited transmission line is passed in the joint of the 6th transmission line and the 7th transmission line, the load of the second open circuited transmission line the 9th
The joint of defeated line and the 6th transmission line, third open circuited transmission line are loaded in the joint of the 7th transmission line and the 8th transmission line,
4th open circuited transmission line and the 5th open circuited transmission line are all loaded in the 8th transmission line and the 9th transmission line joint.With other rings
Shape symmetric circuit is compared, and it is minimum that this symmetrical structure occupies circuit area.
As mode is further preferably carried out, the symmetrical structure of multimode resonator is located at symmetrical
The characteristic impedance of each symmetrical open circuited transmission line of center line two sides and electrical length difference are identical, and are located at symmetrical center line two sides
The characteristic impedance of each balanced pair and electrical length are also identical respectively.Specifically, symmetrical annular multimode resonator, position
It is identical with electrical length in the second open circuited transmission line of symmetrical center line two sides and the characteristic impedance of third open circuited transmission line, the 4th open circuit
Transmission line and the 5th open circuited transmission line characteristic impedance are identical with electrical length, the 6th transmission line and the 7th transmission line characteristic impedance and electricity
Length is identical, and the 8th transmission line and the 9th transmission line characteristic impedance are identical with electrical length, the six, the seven, the eight, the 9th transmission lines
Characteristic impedance it is identical.
It is particularly preferred that the 4th open circuited transmission line intercouples with the six, the 9th transmission lines, the 5th open circuited transmission line and
Seven, the 8th transmission line intercouples, and the coefficient of coup of coupled structure is identical at two.
Therefore multimode resonator of the invention has the advantages that
1, compared with the toroidal cavity resonator of tradition mono- wavelength of Zhou Changwei (using the first passband central frequency as reference frequency),
Toroidal cavity resonator of the invention is half wavelength, effectively reduces circuit area；
2, intercoupling by load open circuited transmission line line and circular transmission line itself, has motivated an additional resonant mode
Formula constitutes four mould resonators, and introduces two additional transmission zeros.
It is important to note that also can be found in embodiment 2 about multimode of the present invention about illustrating for above-mentioned advantage
The explanation of the basic principle of resonator and its filter of composition, it is convenient for statement, it does not repeat herein.
Embodiment 2
The present embodiment provides a kind of dual frequency filter, main body circuit is above-mentioned annular multimode resonator.As shown in Fig. 2,
It may make up dual frequency filter in upper addition a pair of T mode filter feed line of toroidal cavity resonator.
Preferably, the first T shape feed line, by the tenth open circuited transmission line, the 11st open circuited transmission line, the 12nd transmission line structure
At.Tenth open circuited transmission line, the 11st open circuited transmission line connect with 2 three of the 12nd transmission line port, the 12nd transmission line end
Mouth 1 is used as signal input port；11st, the 12nd open circuited transmission line intercouples with the 4th open circuited transmission line, constitutes feed
The input signal access of line and resonator.
2nd T shape feed line, is made of the 13rd open circuited transmission line, the 14th open circuited transmission line, the 15th transmission line.The
13 open circuited transmission lines, the 14th open circuited transmission line connect with 2 three of the 15th transmission line port, the 15th transmission line port 1
As signal output port；13rd, the 14th open circuited transmission line intercouples with the 5th open circuited transmission line, constitute feed line with
The output signal access of resonator.
It is further preferred that the first T shape feed line and the 2nd T shape feed line are distributed in the both sides of multimode resonator, and
Center line about circular transmission line is symmetrical.
The basic principle of the filter of multimode resonator of the present invention and its composition is specifically described below:
As shown in figure 3, being used for analysis and design to analyze the equivalent circuit diagram of annular multimode resonator of the present invention
The electrical parameter initial value of filter.Equivalent circuit by the 4th open circuited transmission line, the 5th open circuited transmission line and circular transmission line it
Between coupling be equivalent to two-wire coupling pipe nipple line.The odd mode impedance of coupling line is denoted as Z0o, even mode impedance is denoted as Z0e。
Since multimode resonator is axisymmetrical structure, when the excitation of odd mould signal, Axisymmetric Distributed Line shows as electric wall, that is, passes
The center line of defeated line is equivalent zero potential.The odd mould resonance frequency that resonator generates is denoted as fo1, fo2, in equivalent circuit no longer
Comprising the second open circuited transmission line, it is illustrated in figure 4 odd mould resonance equivalent circuit.Equally, when even mould signal motivates, Axisymmetric Distributed Line
Magnetic wall is shown as, i.e. the center line of transmission line is equivalent open circuit.It is illustrated in figure 5 even mould resonance equivalent circuit, the idol of resonator
Mould equivalent circuit generates even resonance frequency and is denoted as fe1, fe2, by analysis, Qi Mo and even mould equivalent input impedance are respectively as follows:
PD=YAMsinθd-2 cosθd (3)
PE=2Mcos2 θe+YL(2N2-M2)sin2θe (4)
T1=YAMsin2θt-2cos2θt (5)
T2=YAMcos2θt+2sin2θt (6)
Wherein M=Z0e+Z0o, N=Z0e-Z0o,θt=θd+θe,θs=θd+2θe,YA=tan θa/Za,YB=tan θb/Zb, K=
M2-N2。θdFor the electrical length of the six, the 7th transmission lines, θeFor the electrical length of the eight, the 9th transmission lines, θaAnd ZaFor the second open circuit
The electrical length and characteristic impedance of transmission line, θbAnd ZbFor the electrical length and characteristic impedance of first, third open circuited transmission line.
The odd mould resonance frequency of annular multimode resonator can pass through ZinoIt is as follows that=∞ calculates acquisition:
cosθt(YBMsinθd-cscθesinθt/ 2)=0 (7)
By equation (7) it is found that fo1,fo2It is not exposed to the electrology characteristic parameter θ of second transmission lineaAnd ZaInfluence, therefore
θaAnd ZaIt can be used as the actual parameter for adjusting pass band width.
The even mould resonance frequency of annular multimode resonator can pass through Zine=∞, which is calculated, to be obtained:
2(αCtanθa+αcos2θt+2sin2θt)-(αtanθasinθd
-2cosθd)(βcosθs+βCcosθd)tanθb=0 (8)
Wherein C=N/M, α=M/Za, β=M/Zb.C coefficient of coup between the four, the 5th open-circuit lines and circular transmission line.
Four mode of resonance f that annular multimode resonator generateso1,fo2, fe1,fe2There are following characteristics, fe1,fo1It intercouples
Composition may be constructed the first passband, fe2,fo2It intercouples and constitutes the second passband；It can be made according to above-mentioned equation (7) and (8)
fo1,fo2, fe1,fe2The change curve of the electrical parameter of annular multimode resonator, the chart as filter design.
Specifically, as shown in fig. 6, being fo2/fo1, fe2/fo1, fe1/fo1With θbChange curve, it can be seen that fe1,fo1No
With θbVariation, fe2,fo2With θbIncrease and reduces.Therefore θbIt can be used as the ginseng for adjusting the first passband and the second passband relative position
Number.
As coefficient of coup C=0 between the four, the 5th open-circuit lines and circular transmission line, i.e., coupling is not present therebetween, by
Above-mentioned equation can derive that only there are three effective modes of resonance, are illustrated in figure 7 multimode resonator when the four, the 5th open circuits
There are the scattering parameter comparison diagram under the weak coupling for coupling and not coupling excitation, as C=0, three between line and circular transmission line
A mode is motivated, and as C ≠ 0, four modes are motivated, to constitute dual frequency filter, therefore pass of the invention
Key is to introduce intercoupling between open circuit loaded transmission line and circular transmission line.
The transmission zero for the resonator that annular multimode resonator generates can be calculated by following equation and be obtained:
Zino=Zine (8)
According to above-mentioned derivation equation (6), (7) and (8), as Fig. 8 gives transmission zero (fz1,fz2, fz3,fz4) and resonance
Frequency with coefficient of coup C change curve, it can be seen that work as C=0, fz2And fz4It disappears.Therefore it is passed just because of open circuit is devised
Coupling between defeated line and circular transmission line introduces additional transmission zero, improves the selectivity of filter.
Dual frequency filter is made of above-mentioned multimode resonator.It is in above-mentioned a pair of the T shape feed line of the upper addition of resonator
It may make up dual frequency filter.And frequency bandwidth characteristics can pass through f01,fe1, f02,fe2It adjusts.Fig. 9 gives and is based under different parameters
Three kinds of typical weak coupling scattering parameter simulation results of annular multimode resonator proposed by the present invention, further demonstrate the present invention
Two pass-band performances of double frequency filter can freely adjust.
This example is to realize the contents of the present invention according to the basic principle of above-mentioned multimode resonator, and using microstrip circuit,
Including circuited microstrip loop line, microstrip open-circuit transmission line, microstrip-fed line.It is micro- that a double frequency-band has been made using this multimode resonator
Band filter.
Embodiment 3
Design parameter embodiment of the present embodiment as above-described embodiment, makes specifically technical effect of the invention
It is bright.
In this example, specific circuit parameter is as follows: the odd mould frequency of multimode resonator is respectively 1.6GHz,
2.5GHz, even mould resonance frequency are respectively 1.5GHz, 2.4GHz.First passband is by 1.5GHz and two resonance frequency structures of 1.6GHz
At centre frequency 1.55GHz；Second passband is made of the two resonance frequencies of 2.4GHz and 2.5GHz, and centre frequency is
2.45GHz。
The dielectric constant of the substrate material of the size filter of the example of making is 3.66, with a thickness of 0.78mm, in 10GHz
Loss angle tangent be 0.004.Such as the scale diagrams that Fig. 9 is made filter examples, the geometric dimension of filter are as follows:
L0=19.5, L1=28.2, L2=11, L3=2, L4=18.2 L5=10.8, L6=10, W0=S1=0.2, W2=1.6, W1=
W3=0.35, S0=0.13, unit is millimeter.The area of entire filter is that 0.1 λ of λ g × 0.13 g, λ g is double frequency filter the
Electromagnetic wavelength corresponding to one passband central frequency.It as shown in Figure 10, is the emulation of the example and test frequency response curve.
As seen from the above-described embodiment, the beneficial effect comprise that:.
1. compared with the toroidal cavity resonator of tradition mono- wavelength of Zhou Changwei (using the first passband central frequency as reference frequency),
The toroidal cavity resonator that the present invention uses effectively reduces circuit area for half wavelength.
2. having motivated an additional resonant mode by intercoupling for load open circuited transmission line line and circular transmission line itself
Formula constitutes four mould resonators, and introduces two additional transmission zeros, effectively increase frequency band between double frequency filter every
From degree and Out-of-band rejection degree.
3. can effectively adjust the relative position of two frequency bands by the parameter for adjusting load open circuited transmission line, filtering is improved
Device frequency selectivity.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. multimode resonator, which is characterized in that including circular transmission line and the first open circuited transmission line, the second open circuited transmission line,
Three open circuited transmission lines, the 4th open circuited transmission line and the 5th open circuited transmission line；Wherein, the circular transmission line and first open circuit
Transmission line, second open circuited transmission line, the third open circuited transmission line, the 4th open circuited transmission line, the 5th open circuit
The connection type of transmission line is axially symmetric structure, and symmetrical 4th open circuited transmission line of one pair of them and the 5th is opened
Road transmission line is coupled with circular transmission line interconnection；The circular transmission line is by the 6th transmission line, the 7th transmission line,
Eight transmission lines and the 9th transmission line are constituted, and four sections of transmission lines join end to end；4th open circuited transmission line and the six, the 9th transmission
Line intercouples, and the 5th open circuited transmission line intercouples with the seven, the 8th transmission lines.
2. multimode resonator as described in claim 1, which is characterized in that the first open circuited transmission line load is the described 6th
The joint of transmission line and the 7th transmission line, the second open circuited transmission line load is in the 9th transmission line and the 6th transmission line
Joint, third open circuited transmission line load is in the joint of the 7th transmission line and the 8th transmission line, the described 4th
Open circuited transmission line and the 5th open circuited transmission line are all loaded in the 8th transmission line and the 9th transmission line joint.
3. multimode resonator as described in claim 1, which is characterized in that the multimode resonator is located at the circular transmission line
Center line two sides each symmetrical open circuited transmission line characteristic impedance and electrical length difference it is identical, and be located at the circular transmission line
Center line two sides each balanced pair characteristic impedance and electrical length it is also identical respectively.
4. multimode resonator as described in claim 1, which is characterized in that the 4th open circuited transmission line and the six, the 9th passes
Defeated line intercouples, and the 5th open circuited transmission line intercouples with the seven, the 8th transmission lines, the coupled systemes of coupled structure at two
Number is identical.
5. filter, which is characterized in that the input and output feed line of the connection multimode resonator of the filter is the feedback of a pair of T shape
Electric wire；
The multimode resonator is any multimode resonator of Claims 1-4.
6. filter as claimed in claim 5, which is characterized in that the pair of T mode filter feed line includes:
First T shape feed line, including the tenth open circuited transmission line, the 11st open circuited transmission line, the 12nd transmission line；Described tenth opens
Road transmission line, the 11st open circuited transmission line connect with 2 three of the 12nd transmission line port, and the 12nd transmission line port 1 is made
For signal input port；Described 11st, the 12nd open circuited transmission line intercouples with the 4th open circuited transmission line, constitutes filter
The input signal access of wave device；
2nd T shape feed line, including the 13rd open circuited transmission line, the 14th open circuited transmission line, the 15th transmission line；Described tenth
Three open circuited transmission lines, the 14th open circuited transmission line connect with 2 three of the 15th transmission line port, the 15th transmission line port
1 is used as signal output port；Described 13rd, the 14th open circuited transmission line intercouples with the 5th open circuited transmission line, structure
At the output signal access of filter.
7. filter as claimed in claim 6, which is characterized in that the pair of T shape feed line is distributed in the multimode resonance
The both sides of device, and be axis bilateral symmetry about the center line of the circular transmission line.
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| CN110034360B (en) * | 2019-03-26 | 2020-12-18 | 西安理工大学 | Branch-node rectangular ring three-frequency filter loaded by open-short circuit step impedance line |
| CN111463527A (en) * | 2020-03-05 | 2020-07-28 | 东北大学秦皇岛分校 | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method |
| CN111490321A (en) * | 2020-03-05 | 2020-08-04 | 东北大学秦皇岛分校 | Broadband filter based on improved cross-shaped structure and design method |
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|---|---|---|---|---|
| CN103311614A (en) * | 2013-05-09 | 2013-09-18 | 上海海事大学 | Dual-mode micro-band bandpass filter of crossed patch |
| CN104810596A (en) * | 2015-04-29 | 2015-07-29 | 清华大学 | Multimode resonator and dual-band filter thereof |
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| CN103311614A (en) * | 2013-05-09 | 2013-09-18 | 上海海事大学 | Dual-mode micro-band bandpass filter of crossed patch |
| CN104810596A (en) * | 2015-04-29 | 2015-07-29 | 清华大学 | Multimode resonator and dual-band filter thereof |
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| "A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes";Sha Luo et al;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20101231;第58卷(第12期);第3427-3432页 * |
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