CN107093785A - Multimode resonator and its wave filter - Google Patents
Multimode resonator and its wave filter Download PDFInfo
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- CN107093785A CN107093785A CN201710193076.4A CN201710193076A CN107093785A CN 107093785 A CN107093785 A CN 107093785A CN 201710193076 A CN201710193076 A CN 201710193076A CN 107093785 A CN107093785 A CN 107093785A
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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
-
- 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 wireless communication technology field, it is related to a kind of multimode resonator and its wave filter.Multimode resonator includes circular transmission line and the first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line；Wherein, the open circuited transmission line is symmetrically mounted on circular transmission line, and the 4th open circuited transmission line and the 5th open circuited transmission line intercouple with circular transmission line.Wave filter adds a pair of T-shaped wave filter feed lines in multimode resonator.The present invention has selectivity high, and area is small, the characteristics of double frequency-band relative position flexible adjustment.
Description
Technical field
The invention belongs to wireless communication technology field, and in particular to a kind of multimode resonator and its wave filter.
Background technology
Radio communication it is widely available, promote the development of circuit engineering.Broadband and multi-mode communication system require circuit mould
Block and element have multifrequency and wide band frequency characteristics, on the other hand, and mobile device requires that circuit module occupied area and volume are got over
Small better, Miniaturization Design is also main trend.Therefore, multiband filter especially wave filter has obtained extensive research.
The structure of two kinds of main flow double frequency filters is proposed in all kinds of patents and scientific documents, its main following two side of implementation
Formula, one is：Using multiple singlemode resonance devices, two conventional single band wave filters are designed, are realized by unified feed port
Double frequency filtering characteristic；The second way, using single multimode resonator, multimode resonator can produce multiple modes of resonance, one
As for wave filter need the multimode resonator for producing four modes of resonance to constitute, and the resonant frequency of this four patterns can be only
Vertical control.First way due to the independence of two resonator, on the one hand can with the characteristic of each separately adjustable frequency band, but
It is that the combining form of another aspect wave filter also result in that circuit area is bigger than normal, is unfavorable for the small light of communication system；Second
The mode of kind can obtain compacter wave filter band logical, but multiple model comparisions that multimode resonator is produced are difficult to independent control
System, band ratio (centre frequency of the second passband divided by the centre frequency of the first copper strips) adjustable extent of two frequency bands typically all compares
It is smaller, limit its application.
The constituted mode of multimode resonator include stepped impedance loading branch it is linear, annular, couple linear, patch shape etc..
Various structures have quality, such as stepped impedance loading shape parasitic harmonic wave frequency is more, and adjustable range is limited；Patch shape area it is big and
It is difficult to the closed design method for obtaining wave filter design；Single transmission zero can only typically be introduced between linear two passbands by coupling
Point, passband isolation is not good；Annular mono- wavelength of multimode resonator Zhou Changwei, and selectivity is poor, adjusts passband central frequency
Adjust underaction.
Therefore need it is a kind of both kept small circuit area, pass-band performance can be adjusted independently, and can obtain preferable lead to
Wave filter with isolation.
The content of the invention
In order to solve the above mentioned problem of prior art presence, the invention provides a kind of annular multimode resonator and its double frequency
Band filter, to solve, double frequency filter area of the prior art is big, poor selectivity technical problem.
The technical solution adopted in the present invention is：A kind of multimode resonator, including circular transmission line and the first open circuit are provided
Transmission line, the second open circuited transmission line, the 3rd open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line；Wherein, it is described
Open circuited transmission line is arranged on the circular transmission line using the center line of the circular transmission line as axle is symmetrical, and its
In a pair symmetrical 4th open circuited transmission lines and the 5th open circuited transmission line intercoupled 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
Into four sections of transmission lines join end to end.
Preferably, first open circuited transmission line is carried in the joint of the 6th transmission line and the 7th transmission line, and second opens
Road transmission line is carried in the joint of the 9th transmission line and the 6th transmission line, the 3rd open circuited transmission line be carried 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 carried in the 8th transmission line and the 9th transmission
Line joint.
Preferably, the symmetrical structure of the multimode resonator, i.e. each symmetrical open circuit positioned at symmetrical center line both sides
The characteristic impedance of transmission line is identical with electrical length difference, and the characteristic impedance of each balanced pair positioned at symmetrical center line both 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
7th, 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 wave filter, and the input and output feed line of the connection multimode resonator of the wave filter is one
To T-shaped feed line；The multimode resonator circular transmission line and the first open circuited transmission line, the second open circuited transmission line, the 3rd 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 arranged on for axle is symmetrical on the circular transmission line, and one pair of which the symmetrical described 4th opens
Road transmission line and the 5th open circuited transmission line intercouple with the circular transmission line.
Preferably, the pair of T-shaped feed line includes：First T-shaped 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 are passed
Defeated line intercouples, and constitutes the input signal path of wave filter；Second T-shaped 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 path of wave filter.
Preferably, the pair of T-shaped feed line is distributed in the both sides of the multimode resonator, and is passed on the annular
The center line of defeated line is that axle is symmetrical.
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
Into four sections of transmission lines join end to end.
Preferably, first open circuited transmission line is carried in the joint of the 6th transmission line and the 7th transmission line, institute
The joint that the second open circuited transmission line is carried in the 9th transmission line and the 6th transmission line is stated, the 3rd open circuited transmission line adds
The joint of the 7th transmission line and the 8th transmission line is loaded in, 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 both sides of the circular transmission line
Characteristic impedance it is identical with electrical length difference, and positioned at the circular transmission line center line both sides each balanced pair spy
Levy impedance and electrical length also identical respectively.
Preferably, the 4th open circuited transmission line is intercoupled with the six, the 9th transmission line, and the 5th open circuit is passed
Defeated line intercouples with the seven, the 8th transmission line, and the coefficient of coup of coupled structure is identical at two.
Beneficial effects of the present invention are：1st, multimode resonator of the invention is as a result of open circuited transmission line and annular delivery
Coupling between line, motivates four intrinsic cavity patterns, and introduces two extra transmission zeros, improves wave filter
Frequency selectivity；2nd, wave filter of the invention uses input and output of the toroidal cavity resonator using a pair of T-shaped feed lines as resonator
Feed line so that the filter area is smaller, double frequency-band relative position regulation is more flexible.
Brief description of the drawings
Fig. 1 is the structural representation for the toroidal cavity resonator that the embodiment of the present invention 1 is provided；
Fig. 2 is the structural representation for the dual frequency filter that the embodiment of the present invention 2 is provided；
Fig. 3 is the equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 is provided；
Fig. 4 is the strange mould resonance equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 is provided；
Fig. 5 is the even mould resonance equivalent circuit for the toroidal cavity resonator that the embodiment of the present invention 2 is provided；
Fig. 6 is the toroidal cavity resonator resonant frequency f that the embodiment of the present invention 2 is providedo2/fo1, fe2/fo1, fe1/fo1With θb's
Change curve；
Fig. 7 is the weak coupling of parameter C=0 and C ≠ 0 input scattering parameter in the toroidal cavity resonator that the embodiment of the present invention 2 is provided
Simulation result comparison diagram；
Fig. 8 is that the transmission zero and limit of the toroidal cavity resonator that the embodiment of the present invention 2 is provided are bent with coefficient of coup C change
Line chart；
Fig. 9 is that the dual frequency filter weak coupling that the embodiment of the present invention 2 is provided inputs three kinds of typical speckle parameters simulation knots
Fruit is schemed；
Figure 10 is the simulation results figure for the dual frequency filter that the embodiment of the present invention 3 is provided.
Embodiment
The present invention provides a kind of annular multimode resonator and its dual frequency filter, is filtered with solving double frequency of the prior art
Ripple device area is big, the technical problem of poor selectivity.
Technical scheme in the embodiment of the present application is solves above-mentioned technical problem, and general thought is as follows：By providing one
Kind take 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,
3rd 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 patterns, two to constitute wave filter
Frequency band, and unnecessary transmission zero is introduced, filter frequencies selectivity is improved, so as to be constructed 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 be better understood from above-mentioned technical proposal, below by accompanying 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 case where not conflicting, the embodiment of the present invention and embodiment
In technical characteristic can be mutually combined.
Embodiment 1
As shown in figure 1, the present embodiment, which provides a kind of multimode resonator, includes circular transmission line and the first open circuited transmission line, the
Two open circuited transmission lines, the 3rd open circuited transmission line, the 4th open circuited transmission line and the 5th open circuited transmission line, constitute toroidal cavity resonator；Its
The connected mode of middle circular transmission line and the first, second, third, fourth, the 5th open circuited transmission line, is axially symmetric structure, on
The center line of circular transmission line is symmetrical, and is wherein opened in symmetrically a pair of open circuited transmission lines such as the 4th open circuited transmission line and the 5th
Road transmission line intercouples with circular transmission line.With traditional mono- wavelength of Zhou Changwei (using the first passband central frequency as with reference to frequency
Rate) toroidal cavity resonator compare, toroidal cavity resonator of the invention is half wavelength, effectively reduces 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 end of the transmission line of port 2 and the 7th of i.e. the 6th transmission line
Mouthful 1 is connected, the port 1 of the 7th transmission line port 2 and the 8th transmission line connects, the transmission line of port 2 and the 9th of the 8th transmission line
Port 1 connects, and the 9th transmission line port 2 and the 6th transmission line port 1 connect.
As further mode is preferably carried out, open circuited transmission line is symmetrically mounted on circular transmission line, specifically,
First open circuited transmission line is carried in the joint of the 6th transmission line and the 7th transmission line, and the second open circuited transmission line is carried in the 9th biography
The joint of defeated line and the 6th transmission line, the 3rd open circuited transmission line is carried 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 carried 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 takes circuit area.
As being further preferably carried out mode, the symmetrical structure of multimode resonator, i.e., positioned at symmetrical
The characteristic impedance of each symmetrical open circuited transmission line of center line both sides is identical with electrical length difference, and positioned at symmetrical center line both 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 both sides and the 3rd open circuited transmission line characteristic impedance, 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
7th, 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 following advantages that：
1st, 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 of the present invention is half wavelength, effectively reduces circuit area；
2nd, by loading open circuited transmission line line and circular transmission line intercoupling in itself, an extra resonant mode has been encouraged
Formula, constitutes four mould resonators, and introduce two extra transmission zeros.
It is important to note that also can be found in embodiment 2 on multimode of the present invention on illustrating for above-mentioned advantage
The explanation of the general principle of resonator and its wave filter of composition, it is convenient for statement, do not repeat herein.
Embodiment 2
The present embodiment provides a kind of dual frequency filter, and main body circuit is above-mentioned annular multimode resonator.As shown in Fig. 2
It is that may make up dual frequency filter in a pair of T-shaped wave filter feed lines of upper addition of toroidal cavity resonator.
Preferably, the first T-shaped feed line, by the tenth open circuited transmission line, the 11st open circuited transmission line, the 12nd transmission line structure
Into.Tenth open circuited transmission line, the 11st open circuited transmission line connect with the three of the 12nd transmission line port 2, 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 path of line and resonator.
Second T-shaped feed line, is made up 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 the three of the 15th transmission line port 2, the 15th transmission line port 1
It is used 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 path of resonator.
It is further preferred that the first T-shaped feed line and the second T-shaped feed line are distributed in the both sides of multimode resonator, and
Center line on circular transmission line is symmetrical.
The general principle of multimode resonator of the present invention and its wave filter of composition is specifically described below：
As shown in figure 3, the equivalent circuit diagram to analyze annular multimode resonator of the present invention, for analyzing and designing
The electrical parameter initial value of wave 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。
Because multimode resonator is axisymmetrical structure, when strange mould signal is encouraged, Axisymmetric Distributed Line shows as electric wall, that is, passes
The center line of defeated line is equivalent zero potential.The strange mould resonant frequency that resonator is produced is designated as fo1, fo2, in its equivalent circuit no longer
Comprising the second open circuited transmission line, strange mould resonance equivalent circuit is illustrated in figure 4.Equally, when even mould signal is encouraged, Axisymmetric Distributed Line
The center line for showing as magnetic wall, i.e. transmission line is equivalent open circuit.It is illustrated in figure 5 even mould resonance equivalent circuit, the idol of resonator
Mould equivalent circuit produces even resonant frequency and is designated as fe1, fe2, by analysis, Qi Mo and even mould equivalent input impedance are respectively：
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 of transmission line and characteristic impedance, θbAnd ZbElectrical length and characteristic impedance for the first, the 3rd open circuited transmission line.
The strange mould resonant frequency of annular multimode resonator can pass through Zino=∞, which is calculated, obtains as follows：
cosθt(YBMsinθd-cscθesinθt/ 2)=0 (7)
From equation (7), fo1,fo2It is not exposed to the electrology characteristic parameter θ of the second transmission lineaAnd ZaInfluence, therefore
θaAnd ZaThe actual parameter for adjusting pass band width can be used as.
The even mould resonant 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 is the coefficient of coup between the four, the 5th open-circuit lines and circular transmission line.
Four mode of resonance f that annular multimode resonator is producedo1,fo2, fe1,fe2There are following characteristics, fe1,fo1Intercouple
Composition may be constructed the first passband, fe2,fo2The second passband of the composition that intercouples；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, is used as the chart of wave 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 θbChange, fe2,fo2With θbIncrease and reduce.Therefore θbThe first passband of regulation and the ginseng of the second passband relative position can be used as
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 only three effective modes of resonance, be illustrated in figure 7 multimode resonator when the four, the 5th open circuits
Have between line and circular transmission line and couple and without the scattering parameter comparison diagram under the weak coupling excitation coupled, as C=0, three
Individual pattern is energized, and as C ≠ 0, four patterns are energized, so that dual frequency filter is constituted, therefore the pass of the present 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 is produced can be calculated by below equation and 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 fz4Disappear.Therefore passed just because of open circuit is devised
Coupling between defeated line and circular transmission line, introduces extra transmission zero, improves the selectivity of wave filter.
Dual frequency filter, is made up of above-mentioned multimode resonator.It is in above-mentioned a pair of T-shaped feed line of the upper addition of resonator
It may make up dual frequency filter.And frequency bandwidth characteristicses can pass through f01,fe1, f02,fe2Regulation.Fig. 9 gives and is based under different parameters
The typical weak coupling scattering parameter simulation result of three kinds of annular multimode resonator proposed by the present invention, further demonstrates the present invention
Two pass-band performances of double frequency filter can freely adjust.
This example is the general principle according to above-mentioned multimode resonator, and realizes present disclosure using microstrip circuit,
Including circuited microstrip loop line, microstrip open-circuit transmission line, microstrip-fed line.It is micro- a double frequency-band have been made using this multimode resonator
Band filter.
Embodiment 3
The present embodiment is made specifically as the design parameter embodiment of above-described embodiment to the technique effect of the present invention
It is bright.
In this example, specific circuit parameter is as follows：The strange mould frequency of multimode resonator is respectively 1.6GHz,
2.5GHz, even mould resonant frequency is respectively 1.5GHz, 2.4GHz.First passband is by 1.5GHz and two resonant frequency structures of 1.6GHz
Into centre frequency is 1.55GHz；By 2.4GHz and 2.5GHz, the two resonant frequencies are constituted second passband, and centre frequency is
2.45GHz。
The dielectric constant of the backing material of the size filter of the example of making is 3.66, and thickness is 0.78mm, in 10GHz
Loss angle tangent be 0.004.Such as the scale diagrams that Fig. 9 is made filter examples, the physical dimension of wave filter is：
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 whole wave filter is that 0.1 λ g × 0.13 λ g, λ g is double frequency filter the
Electromagnetic wavelength corresponding to one passband central frequency.As shown in Figure 10, the emulation for 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 is used effectively reduces circuit area for half wavelength.
2. by load open circuited transmission line line with circular transmission line intercoupling in itself, encouraged an extra resonant mode
Formula, constitutes four mould resonators, and introduces two extra transmission zeros, effectively increase frequency band between double frequency filter every
From degree and Out-of-band rejection degree.
3. the parameter of open circuited transmission line is loaded by adjusting can effectively adjust the relative position of two frequency bands, filtering is improved
Device frequency selectivity.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. multimode resonator, it is characterised 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 open circuited transmission line is with the annular delivery
The center line of line, which is that axle is symmetrical, to be arranged on the circular transmission line, and one pair of which the symmetrical described 4th
Open circuited transmission line and the 5th open circuited transmission line intercouple with the circular transmission line.
2. multimode resonator as claimed in claim 1, it is characterised in that the circular transmission line is by the 6th transmission line, the 7th
Transmission line, the 8th transmission line and the 9th transmission line are constituted, and four sections of transmission lines join end to end.
3. multimode resonator as claimed in claim 2, it is characterised in that first open circuited transmission line is carried in the described 6th
The joint of transmission line and the 7th transmission line, second open circuited transmission line is carried in the 9th transmission line and the 6th transmission line
Joint, the 3rd open circuited transmission line is carried 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 carried in the 8th transmission line and the 9th transmission line joint.
4. multimode resonator as claimed in claim 2, it is characterised in that the multimode resonator is located at the circular transmission line
Center line both sides each symmetrical open circuited transmission line characteristic impedance it is identical with electrical length difference, and positioned at the circular transmission line
Center line both sides each balanced pair characteristic impedance and electrical length it is also identical respectively.
5. multimode resonator as claimed in claim 2, it is characterised in that the 4th open circuited transmission line and the six, the 9th is passed
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.
6. wave filter, it is characterised in that the input and output feed line of the connection multimode resonator of the wave filter is a pair of T-shaped feedbacks
Electric wire；
The multimode resonator is any described multimode resonator of claim 1 to 5.
7. wave filter as claimed in claim 6, it is characterised in that the pair of T-shaped wave filter feed line includes：
First T-shaped 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 the three of the 12nd transmission line port 2, 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 path of ripple device；
Second T-shaped 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 the three of the 15th transmission line port 2, 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
Into the output signal path of wave filter.
8. wave filter as claimed in claim 7, it is characterised in that the pair of T-shaped feed line is distributed in the multimode resonance
The both sides of device, and it is symmetrical for axle on the center line of the circular transmission line.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110034360A (en) * | 2019-03-26 | 2019-07-19 | 西安理工大学 | Open the three frequency filter of minor matters straight-flanked ring of short-circuit Stepped Impedance line load |
| 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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2017
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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 |
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| SHA LUO ET AL: ""A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes"", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034360A (en) * | 2019-03-26 | 2019-07-19 | 西安理工大学 | Open the three frequency filter of minor matters straight-flanked ring of short-circuit Stepped Impedance line load |
| 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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| CN107093785B (en) | 2019-10-29 |
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