CN109301425A - Three conductor parallel synthesis resonators of one kind and double frequency filter and design method - Google Patents
Three conductor parallel synthesis resonators of one kind and double frequency filter and design method Download PDFInfo
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- CN109301425A CN109301425A CN201811252849.2A CN201811252849A CN109301425A CN 109301425 A CN109301425 A CN 109301425A CN 201811252849 A CN201811252849 A CN 201811252849A CN 109301425 A CN109301425 A CN 109301425A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/008—Manufacturing resonators
Abstract
The invention discloses a kind of three conductor parallel synthesis resonators and double frequency filter and design methods, the resonator includes: the first open circuit conductor, short-circuit conductor, second open circuit conductor, first open circuit conductor, short-circuit conductor, any two are parallel to each other in second open circuit conductor three, and first open circuit conductor with second open circuit conductor about centre short-circuit conductor it is mutually symmetrical with, the corresponding first open circuit detail of first open circuit conductor, short-circuit conductor corresponds to short branch, the corresponding second open circuit detail of second open circuit conductor, first open circuit detail, short branch, second open circuit detail decoupling is combined into the three conductors parallel synthesis resonator, parallel symmetrical three detail proposed by the present invention can not only effectively reduce circuit size, and it can produce the multiple transmission zeros independently regulated and controled, to improve the selectivity of double-passband filter.
Description
Technical field
The present invention relates to electronic information technical fields, and in particular, to three conductor parallel synthesis resonators of one kind and double frequency
Filter and design method.
Background technique
Bandpass filter be the important component in wireless system, especially flat filter due to its low manufacturing cost with
And many advantages, such as being easy with other circuit integrations in PCB (Printed circuit board, printed circuit board), thus
Play a significant role in radio circuit design.In modern wireless communication systems, with the increasing of dual band front end system application
Add, the demand to double frequency filter is also more and more.In order to improve the electric property of double frequency filter, containing multiple transmission zeros
The typical frequencies response curve of high-performance double-passband filter is as shown in Figure 1, in Fig. 1, f1、f2It is double frequency filter first respectively
With the centre frequency of the second passband, IL1, IL2 are the insertion loss of the first and second passband of double frequency filter, BW1, BW 2 respectively
It is the first and second passbands of double frequency filter-three dB bandwidth respectively, BSR1, BSR 2, BSR are that the band of double frequency filter is outer respectively
Inhibition and interband isolation, Tzs1, Tzs2, Tzs3 are the transmission zero of double frequency filter, S respectively21It is the transmission system of filter
Number.Since the selectivity of this kind of filter not only each passband is higher, but also the isolation between two passbands is also fine.Cause
This, this kind of filter has obtained extensive concern.
About double-passband filter, it has already been proposed various topological structures and implementation methods.First method, and
Most straightforward approach is exactly cascaded using two independent bandpass filters and bandstop filter to obtain two passbands
Response, for working principle topology as shown in Fig. 2, in Fig. 2, dash area is two passbands of double frequency filter.It is filtered at two
During wave device is cascade, it usually needs impedance matching network realizes unreflected connection.It will be apparent that this use two filters
The double frequency circuit structure that the cascade method construct of wave device comes out is not compact, and size/volume is very big.In addition, cascade bandreject filtering
Device and matching network can also introduce new additional transmitted loss；Second method is using step electric impedance resonator, i.e., using half
Wavelength and all-wave length resonator remove design two-band filter, go to improve frequency selectivity by introducing additional transmitted zero point；The
Three kinds of methods are that two independent resonators and identical input/output end port combine to construct two-band filter.But
It is that all these two-band filters all have that circuit size is larger, transmission zero is less and dead-center position cannot be controlled independently
The problems such as processed.
Band logical and the double frequency filter structure realized with resistance by matching network cascade, circuit size usually compare two solely
Vertical filter is also big, while can also introduce higher insertion loss.So, circuit production cost is not only increased,
And it will increase the design and debugging difficulty of filter.
Two quasi resonant oscillators based on parallel construction have also resulted in very big size for designing two-band filter.
Although compact two-band filter may be implemented in the toroidal cavity resonator stacked using two, but it still has disadvantage, performance
Front end insertion loss in passband is very big, and regulatable frequency range and its bandwidth are very limited.In addition, it is difficult to obtain
Different external sort factor and the coefficient of coup are obtained, to meet the technical requirement in two passbands simultaneously.To understand
Certainly this problem, there has been proposed a kind of new structure, this structure can realize the ideal coefficient of coup in all passbands.
But the tunable range of external sort factor is still very limited, the double frequency filter bandwidth of design is still restricted very much.In order to
Required design objective (i.e. centre frequency and bandwidth) is obtained in two passbands, there has been proposed a kind of novel methods to set
Two-band filter is counted, i.e. the circuited microstrip loop resonator by two with perturbation patch realizes that the bimodulus two-band of design is rung
It answers.Although toroidal cavity resonator possesses Low emissivity, easily fabricated and advantages of simple structure and simple, have edge or end face coupling
The loop filter of conjunction, which but encounters, couples loose deficiency between resonator and input/output terminal feeder line, result in outer component
Quality factor is very high.Therefore, this kind of filter can only obtain very narrow fractional bandwidth, to may not apply to broadband radio system
In.In order to solve the problems, such as this respect, people have had also been proposed several method.Regrettably, they may not apply to two-band
The case where.
In conclusion that there are sizes is larger, transmission zero number is few and dead-center position is not easy for existing two-band filter
Regulation, the disadvantages of frequency selectivity is poor and structure is complicated and deficiency.
Summary of the invention
In two-band frequency microwave filter, in order to obtain highly selective dual-passband frequency response, the transmission of circuit
Characteristic should have multiple transmission zeros in passband edge and interband isolation, to filter out unwanted frequency in radio system
And spurious response.Therefore, double-passband filter is the important component in modern dual band wireless communication system.It comes out at present
Double-frequency bandpass filtering device problem not larger there is only geometric dimension, and its transmission zero is less and dead-center position is difficult to solely
The poor deficiencies of frequency selectivities such as vertical regulation.Parallel symmetrical three detail proposed by the present invention can not only effectively reduce circuit ruler
It is very little, and can produce the multiple transmission zeros independently regulated and controled, to improve the selectivity of double-passband filter.
For achieving the above object, this application provides a kind of three conductor parallel synthesis resonators, the resonator packets
It includes:
First open circuit conductor, short-circuit conductor, the second open circuit conductor, the first open circuit conductor, short-circuit conductor, the second open circuit conductor
Any two are parallel to each other in three, and the first open circuit conductor and the second open circuit conductor are mutually opposite about intermediate short-circuit conductor
Claim, the corresponding first open circuit detail of the first open circuit conductor, short-circuit conductor corresponds to short branch, corresponding second open circuit of the second open circuit conductor
Detail, the first open circuit detail, short branch, the second open circuit detail decoupling are combined into the three conductors parallel synthesis resonator.
Present invention also provides a kind of double frequency filter based on three conductor parallel synthesis resonators, the double frequency filters
Include:
The three conductors synthesis resonator of main transmission line, several cascade stubs；The three conductors synthesis of several cascade stubs
Resonator is connected in parallel on main transmission line, and three conductor parallel synthesis resonators of the cascade stub include: that the first open circuit is led
Body, short-circuit conductor, the second open circuit conductor, electrical connection transmission line；First open circuit conductor, short-circuit conductor, the second open circuit conductor three
Any two are parallel to each other in person；First open circuit conductor and the second open circuit conductor are mutually symmetrical with about intermediate short-circuit conductor, the
The corresponding first open circuit detail of one open circuit conductor, short-circuit conductor correspond to short branch, and the second open circuit conductor corresponds to the second open circuit detail,
First open circuit detail, short branch, the second open circuit detail decoupling are combined into three conductor parallel synthesis resonators, and three conductors are simultaneously combined
Three conductor parallel synthesis resonators of composition cascade stub are connect with electrical connection transmission line at resonator；First open circuit conductor
One end and one end of the second open circuit conductor open a way, one end of short-circuit conductor ground connection, the other end of the first open circuit conductor, short circuit
The other end of conductor, second other end for opening a way conductor pass through electrical connection transmission line and connect with main transmission line.
Further, the double frequency filter further include: dielectric substrate, cavity；First open circuit conductor, the second open circuit are led
Body, short-circuit conductor are arranged on dielectric substrate, the first open circuit conductor, the second open circuit conductor, short-circuit conductor and its Jie of attachment
Matter substrate is respectively provided in the cavity.
Further, between the spacing between the first open circuit conductor and short-circuit conductor and the second open circuit conductor and short-circuit conductor
Spacing be S0, S0Range be greater than equal to 0.5mm.
Further, the input admittance equation of the three conductors synthesis resonator of stub are as follows:
The condition of resonance of the three conductors synthesis resonator of stub is as follows:
2Yo.ctanθo.c-Ys.ccotθs.c+tanθc=0 (1b)
Wherein, YiFIt is input admittance, Yo.c、θo.cIt is the Characteristic mobility and electrical length of open circuit detail, Y respectivelys.c、θs.cRespectively
It is the Characteristic mobility and electrical length of short branch, Zc、θcIt is the characteristic impedance and electrical length for being electrically connected transmission line respectively, j is void
Portion's unit.
Further, the design equation of double frequency filter includes:
The input admittance of the three conductors synthesis resonator of three stubs is uniformly provided by following formula:
Wherein, YiF,n(n=1,2,3) is the input admittance of n-th of three conductors synthesis resonators, θo.c,n、θs.c,n(n=1,
It 2,3) is the electrical length of detail and short branch of opening a way in n-th three conductors synthesis resonators, Y respectivelyc、θc,n(n=1,2,3)
It is the Characteristic mobility for being electrically connected transmission line and corresponding electrical length respectively；
Three conductors synthesis resonator cascade equation [ABCD] of three stubsF,n(n=1,2,3) it is given by:
Wherein, YiF,n(n=1,2,3) is the input admittance of n-th of three conductors synthesis resonators, [ABCD]F,n(n=1,2,
3) be n-th three conductors synthesis resonator cascade equation；
Total concatenation matrix [ABCD] of double frequency filtertIt is indicated by following formula:
Wherein, main transmission line matrix [ABCD]ms:
The transmission coefficient of double frequency filter, i.e. S21 are obtained by above-mentioned abcd matrix:
Wherein, Zms、Yms、θmsIt is characteristic impedance, Characteristic mobility and the electrical length of s (s=1,2) a main transmission line respectively,
A, B, C and D are each component of total concatenation matrix, Z respectively0It is the system impedance of filter.
Further, the three conductors synthesis resonator of several stubs is respectively positioned on the same side of main transmission line.
Present invention also provides a kind of design method of symmetrical three details double frequency filter, the symmetrical three details double frequency filter
Wave device is the symmetrical three details double frequency filter stated, and the design method includes:
Step 1: determining the interval S between the first open circuit conductor and short-circuit conductor0, confirm that the second open circuit conductor is led with short circuit
The equal S of spacing between body0；
Step 2: judge the first open circuit detail, short branch, the whether successful uncoupling of the second open circuit detail, if so then execute
Step 3, if otherwise continuing to execute step 1；
Step 3: program calculation obtains the initial value of resonator geometric dimension, the transmission system of electromagnetic simulation software Optimal Filter
Number parameter, utilizes the circuit size of default equation (i.e. equation group 1-5) complex optimum filter；
Step 4: judging whether the transmission coefficient parameter of filter meets design objective；If satisfied, step 5 is then carried out, if
It is unsatisfactory for then return step 3；
Step 5: the symmetrical three details double frequency filter parameter obtained based on step 3 carries out double frequency filter PCB production,
And carry out circuit test.
One or more technical solution provided by the present application, has at least the following technical effects or advantages:
(1) first open circuit conductor, short-circuit conductor, the second open circuit conductor are located at the same of main transmission line by parallel mode
Side, thus it is more more compact than the two sides that these three conductors are respectively placed in main transmission line, to make to synthesize resonator dimensions reduction；
(2) first open circuit conductors, short-circuit conductor, the second open circuit conductor are in parallel by uncoupling mode, therefore calculate this kind of
The method of synthesis resonator is still similar to three independent conductors, so that circuit design is simpler；
(3) first open circuit conductors, short-circuit conductor, the second open circuit conductor constitute three conductors of amendment by electrical connection transmission line
Resonator is synthesized, due to increasing the free variable of synthesis resonator, so further increasing the flexibility of circuit design；
(4) first open circuit conductors, short-circuit conductor, the second open circuit conductor and electrical connection transmission line can be passed with independent control
Defeated dead-center position since these control parameters are free variables, thus increases the flexibility of filter design.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is the typical frequencies response schematic diagram of double frequency filter；
Fig. 2 is band logical and the two-band filter schematic with resistance cascade construction；
Fig. 3 a is novel three conductors synthesis resonator topological structure schematic diagram；
Fig. 3 b is the three conductors synthesis resonator structure schematic diagram for cascading stub；
Fig. 4 is the double frequency filter topology schematic diagram based on three conductors synthesis resonator；
Fig. 5 is three conductor radio-frequency filter design cycle schematic diagrames；
Fig. 6 is the three conductor double frequency filter PCB layout schematic diagrames designed and Implemented；
Fig. 7 is the frequency response schematic diagram of three conductor two-band filters.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
The invention proposes a kind of novel synthesis resonators of open, short-open circuit of parallel connection, and are discussing that it is electrical
A kind of double frequency filter applied to WCDMA/WiMAX will be constructed after characteristic.As Fig. 3 gives two kind of three conductor parallel resonance
The electric topology and its parameter of device, wherein that Fig. 3 (a) is provided is Y in synthesis resonator E, Fig. 3 a of general structureiEIt is synthesis
The input admittance of resonator E, Zo.c、θo.cIt is the Characteristic mobility and electrical length of open circuit detail, Z respectivelys.c、θs.cIt is short-circuit branch respectively
The Characteristic mobility and electrical length of section, wo.c、lo.cIt is the width and length of open circuit detail, w respectivelys.c、ls.cIt is short branch respectively
Width and length.And then to give the synthesis that novel modified three conductors parallel connection cascades electrical transmission line again humorous by Fig. 3 (b)
Shake device F, in Fig. 3 b, YiEIt is the input admittance for synthesizing resonator E, YiFIt is the input admittance for synthesizing resonator F, Zo.c、θo.cRespectively
It is the Characteristic mobility and electrical length of open circuit detail, Zs.c、θs.cIt is the Characteristic mobility and electrical length of short branch, Z respectivelyc、θcRespectively
It is the characteristic impedance and electrical length for being electrically connected transmission line, wo.c、lo.cIt is the width and length of open circuit detail, w respectivelys.c、ls.c
It is the width and length of short branch, w respectivelyc、lcIt is the width and length for being electrically connected transmission line respectively.
Derive the Resonance Equation of the novel synthesis resonator F of open, short-three conductor of open circuit parallel connection below.Firstly,
The transmission characteristic of three conductor parallel resonators of qualitative analysis and discussion is with conductor interval S0Variation.The result shows that when between conductor
Interval S0When greater than 0.5mm, ignores to simplify design for the influence to intercouple between conductor, be considered as independent three conductor
Parallel connection synthesizes resonator.
For simplicity, open circuit proposed by the present invention or short branch resonator are symmetrical, including isometric (detail is long
Degree is denoted as lo.c=ls.c=losOr electrical length θo.c=θs.c=θos) and conductor between spacing (be denoted as S0) it is equal.According to
Equation for transmission line, the approximate input admittance equation of available resonator F,
Therefore, the approximate resonance condition for synthesizing resonator F is as follows,
2Yo.ctanθo.c-Ys.ccotθs.c+tanθc=0 (1b)
Three conductor double frequency filter topologys:
Resonator F is synthesized based on above-mentioned three conductor, the present invention filters the high-performance double frequency for designing a kind of multiple transmission zeros
Wave device, it will be operate in WCDMA/WiMAX double-frequency wireless system.
Resonator F is synthesized according to the novel three conductors parallel connection that Fig. 3 (b) is proposed, a kind of double frequency filter can be constructed
Topology, as shown in figure 4, in Fig. 4, YiF1, YiF2, YiF3It is the input admittance of three synthesis resonators F1, F2 and F3, Y respectivelyiE1,
YiE2, YiE3It is the input admittance of three synthesis resonators E1, E2 and E3 respectively；Zo.c、Zs.cIt is open circuit detail and short circuit branch respectively
The characteristic impedance of section, θo.ci、θs.ci(i=1,2,3) is the electrical length of open circuit detail and short branch, Z respectivelyc、θci(i=1,2,
It 3) is the characteristic impedance and electrical length for being electrically connected transmission line respectively；wo.c、lo.ci(i=1,2,3) respectively be open a way detail width
Degree and length, ws.c、ls.ci(i=1,2,3) be respectively short branch width and length.wc、lciIt (i=1,2,3) is electricity respectively
The width and length of gas connection transmission line；Zmi, θmi(i=1,2) be then on main transmission line the characteristic impedance of each concatenation unit and
Electrical length.Z0It is the characteristic impedance of filter input and output port.Thus scheme three synthesis resonators as it can be seen that in filter
F1, F2 and F3 only have differences in open circuit or short branch length and cascade stub lengths, remaining is all identical.In this way
Layout is designed not only for simplified circuit structure, and also for simplifying.Therefore, the centre frequency and its transmission of filter
The layout of zero point is mainly adjusted by resonator length and cascade stub lengths.
The working mechanism of double frequency filter:
Filter topologies according to Fig.4, are it is found that the working principle of double frequency response is as follows: open circuit is branch merism one wide
Band BPF, by its first resonance frequency fr1(being equivalent to transmission zero) and its second subfrequency fr2(being equivalent to transmission zero)
Composition, and meet fr2=3fr1.Its transmission zero is determined by the quarter-wave frequency of the first resonance；Short branch is in broadband
The bandstop filter (BSF) of one narrowband of superposition, transmission zero are determined by the half-wavelength frequency of resonance in BPF.Therefore, here
Design the harmonic response characteristic of band gap resonance is utilized.
The Approximate Design equation of three conductor double frequency filters:
In Fig. 4, the approximate input admittance of three synthesis resonators can uniformly be provided by following formula,
Therefore, cascade equation ABCD is given by,
So total concatenation matrix of filter can by following formula approximate representation,
Wherein, main transmission line matrix,
By the transmission coefficient of the available filter of above-mentioned abcd matrix, i.e. S21
When the denominator of above-mentioned expression formula is infinitely great, the frequency response of filter has transmission zero.Arrange the denominator table
Up to formula, and thus to obtain the condition for generating transmission zero in various situations.
The realization of three conductor filters:
Filter proposed by the present invention is applied to WCDMA/WiMAX system, working frequency 2.1/3.5GHz.Based on amendment
The Design of Bandpass process of symmetrical three detail is as shown in figure 5, its basic step can be summarized as follows: (1) by calculate or
Circuit analysis determines the minimum spacing S of parallel three details uncoupling0；(2) filter joint aggregative formula (1.1)-(1.5), benefit
The initial value of circuit parameter is determined with computer aided design software, recycles the dimensioning of electromagnetic simulation software Optimal Filter
It is very little；(3) after meeting wave filter technology index, PCB (Printed circuit board, printed circuit board) is made and to circuit
It is tested.
The topology and Approximate Design equation of resonator and its filter, available design institute are synthesized according to above-mentioned three conductor
The double frequency filter needed, for wiring as shown in fig. 6, in Fig. 6, Lsi (i=1,2,3) is in i-th of synthesis resonator respectively
The length of open circuit conductor and short-circuit conductor, Ws1, Ws2 are the width for synthesizing short-circuit conductor and conductor of opening a way in resonator respectively,
Lci (i=1,2,3) is the length of i-th of electrical connection transmission line, and Wc is the width for being electrically connected transmission line, Wm and Lms difference
It is the width and length of main transmission line concatenation unit.The system impedance of input/output end port is 50 Ω.Entirely filter is effective
Having a size of 0.43 λg1×0.32λg1, wherein λg1It is the guide wavelength at the first passband central frequency.Finally, three conductor filter
Frequency response as shown in fig. 7, in Fig. 7, S21 and S11 are the transmission coefficient and return loss of filter respectively.Thus figure can
See, the electric parameter that filter obtains is as follows: the centre frequency of the first passband is in 2.12GHz, and its -3dB fractional bandwidth FBW=
24.8%.Minimum insertion loss is located at 2.17GHz, value IL=0.96dB in passband, and occurs with interior maximum return loss
In 2.18GHz, value RL=11.2dB；The centre frequency of second passband is located at 3.45GHz, and the fractional bandwidth FBW of -3dB
=11.9%.Minimum insertion loss is located at 3.45GHz, value IL=1.0dB in passband, and is located at interior maximum return loss
3.45GHz, value 27.8dB.In addition, the double frequency band-pass filter shows good frequency selectivity, i.e., in two passbands
Multiple transmission zeros are produced in adjacent edges and its spaced off-frequency band, they are respectively: -42.8dB/1.31GHz, -
52.9dB/1.38GHz, -56.3dB/1.48GHz, -40.1dB/2.6GHz, -48.8dB/2.76GHz, -49.9dB/
2.94GHz, -31.5dB/3.94GHz, -40.1dB/4.17GHz and -32.2dB/4.42GHz.
Three parallel detail uncoupling connection methods described herein.Transmission zero can not only be increased by this method
The number of point changes parallel detail length individually to realize the independent control of transmission zero, and because single detail is not put
It is placed in the both sides up and down of main transmission line and makes circuit structure still very compact.
The method of the tunable three details resonator of building described herein.It is parallel symmetrical by being introduced to short-circuit single detail
Open circuit detail to increase the number of transmission zero, the transmission line for then meeting electrical connection with one is connected.It is further in this way
Increase the flexibility of control transmission zero location.
Bandpass filter structures described herein.Three detail of open, short-open circuit proposed by the present invention keeps symmetrical,
Therefore reduce the number of independent variable in circuit, and then achieve the purpose that simplified circuit design.Parallel detail is provided electrically to connect
The length of transmission line connect differs, to control the position of transmission zero.
The invention proposes the geometries and design method of a kind of novel double-frequency section microstrip bandpass filter.This structure
Multiple transmission zeros can be generated, circuit topology is simple and effective.Relative ease is not only designed, but also dead-center position can be by opening
Road or short branch and the length of transmission line of electrical connection carry out independent control, thus are easily adjusted zero point.Meanwhile with it is traditional
High-order detail line band-pass filter is compared, and the size of entire circuit is more compact and minimizes.
Realize that the bandpass filtering of transmission zero responds using detail in parallel, there are many implementations.Method traditional at present
It is to be connected in parallel on main transmission line using the open circuit list detail of half-wavelength, then passes through the transmission line grade of a quarter guide wavelength again
Receipts or other documents in duplicate member concatenates.But often size is larger, transmission zero number is few for this design, and design process is more complicated
With it is cumbersome.The above method is in the regulation of transmission zero location and inconvenient with flexibly, and main pass through adjusts simultaneously receipts or other documents in duplicate detail line
Length realize.The deficiency of above structure and method is exactly problem to be solved by this invention.
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 (8)
1. a kind of three conductor parallel synthesis resonators, which is characterized in that the resonator includes:
First open circuit conductor, short-circuit conductor, the second open circuit conductor, the first open circuit conductor, short-circuit conductor, the second open circuit conductor three
Middle any two are parallel to each other, and the first open circuit conductor and the second open circuit conductor are mutually symmetrical with about intermediate short-circuit conductor, the
The corresponding first open circuit detail of one open circuit conductor, short-circuit conductor correspond to short branch, and the second open circuit conductor corresponds to the second open circuit detail,
First open circuit detail, short branch, the second open circuit detail decoupling are combined into the three conductors parallel synthesis resonator.
2. a kind of double frequency filter based on three conductor parallel synthesis resonators, which is characterized in that the double frequency filter includes:
The three conductors synthesis resonator of main transmission line, several cascade stubs；Three conductors of several cascade stubs synthesize resonance
Device is connected in parallel on main transmission line, it is described cascade stub three conductor parallel synthesis resonators include: the first open circuit conductor, it is short
Road conductor, the second open circuit conductor, electrical connection transmission line；First open circuit conductor, short-circuit conductor, second open circuit conductor three in appoint
Meaning two is parallel to each other；First open circuit conductor and the second open circuit conductor are mutually symmetrical with about intermediate short-circuit conductor, the first open circuit
The corresponding first open circuit detail of conductor, short-circuit conductor correspond to short branch, and the corresponding second open circuit detail of the second open circuit conductor, first opens
Road detail, short branch, the second open circuit detail decoupling are combined into three conductor parallel synthesis resonators, three conductor parallel synthesis resonance
Device connect three conductor parallel synthesis resonators of composition cascade stub with electrical connection transmission line；One end of first open circuit conductor
It opens a way with one end of the second open circuit conductor, one end of short-circuit conductor ground connection, the other end of the first open circuit conductor, short-circuit conductor
The other end, second other end for opening a way conductor pass through electrical connection transmission line and connect with main transmission line.
3. the double frequency filter according to claim 2 based on three conductor parallel synthesis resonators, which is characterized in that described
Double frequency filter further include: dielectric substrate, cavity；First open circuit conductor, the second open circuit conductor, short-circuit conductor are arranged at medium
On substrate, the first open circuit conductor, the second open circuit conductor, short-circuit conductor and its dielectric substrate of attachment are respectively provided in the cavity.
4. the double frequency filter according to claim 2 based on three conductor parallel synthesis resonators, which is characterized in that first
The spacing between conductor and short-circuit conductor of opening a way and the spacing between the second open circuit conductor and short-circuit conductor are S0, S0Range
It is greater than and is equal to 0.5mm.
5. the double frequency filter according to claim 2 based on three conductor parallel synthesis resonators, which is characterized in that cutting back
The input admittance equation of the three conductors synthesis resonator of line are as follows:
The condition of resonance of the three conductors synthesis resonator of stub is as follows:
2Yo.ctanθo.c-Ys.ccotθs.c+tanθc=0 (1b)
Wherein, YiFIt is input admittance, Yo.c、θo.cIt is the Characteristic mobility and electrical length of open circuit detail, Y respectivelys.c、θs.cIt is short respectively
The Characteristic mobility and electrical length of road detail, Zc、θcIt is the characteristic impedance and electrical length for being electrically connected transmission line respectively, j is imaginary part list
Position.
6. the double frequency filter according to claim 5 based on three conductor parallel synthesis resonators, which is characterized in that double frequency
The design equation of filter includes:
The input admittance of the three conductors synthesis resonator of three stubs is uniformly provided by following formula:
Wherein, YiF,n(n=1,2,3) is the input admittance of n-th of three conductors synthesis resonators, θo.c,n、θs.c,n(n=1,2,3)
It is the electrical length of open circuit detail and short branch in n-th of three conductors synthesis resonators, Y respectivelyc、θc,n(n=1,2,3) respectively
It is the Characteristic mobility for being electrically connected transmission line and corresponding electrical length；
Three conductors synthesis resonator cascade equation [ABCD] of three stubsF,n(n=1,2,3) it is given by:
Wherein, YiF,n(n=1,2,3) is the input admittance of n-th of three conductors synthesis resonators, [ABCD]F,n(n=1,2,3) it is
The cascade equation of n-th of three conductors synthesis resonators；
Total concatenation matrix [ABCD] of double frequency filtertIt is indicated by following formula:
Wherein, main transmission line matrix [ABCD]ms:
The transmission coefficient of double frequency filter, i.e. S21 are obtained by above-mentioned abcd matrix:
Wherein, Zms、Yms、θmsIt is characteristic impedance, Characteristic mobility and the electrical length of s (s=1,2) a main transmission line respectively, A, B,
C and D is each component of total concatenation matrix, Z respectively0It is the system impedance of filter.
7. symmetric double detail bandpass filter according to claim 2, which is characterized in that three conductors of several stubs close
The same side of main transmission line is respectively positioned at resonator.
8. a kind of design method of symmetrical three details double frequency filter, the symmetrical three details double frequency filter are claim 2-
Any one of symmetrical three details double frequency filter in 7, which is characterized in that the design method includes:
Step 1: determining the interval S between the first open circuit conductor and short-circuit conductor0, confirmation second open circuit conductor and short-circuit conductor it
Between the equal S of spacing0；
Step 2: judge the first open circuit detail, short branch, the whether successful uncoupling of the second open circuit detail, if so then execute step
3, if otherwise continuing to execute step 1；
Step 3: program calculation obtains the initial value of resonator geometric dimension, the transmission coefficient ginseng of electromagnetic simulation software Optimal Filter
Number, utilizes the circuit size of default equation complex optimum filter；
Step 4: judging whether the transmission coefficient parameter of filter meets design objective；If satisfied, step 5 is then carried out, if discontented
Sufficient then return step 3；
Step 5: the symmetrical three details double frequency filter parameter obtained based on step 3 is carried out double frequency filter PCB production, gone forward side by side
Row circuit test.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676153A (en) * | 2021-08-09 | 2021-11-19 | 成都频岢微电子有限公司 | High-inhibition-degree circuit structure, high-isolation-degree duplexer and multiplexer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956545A (en) * | 2014-04-23 | 2014-07-30 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN203760606U (en) * | 2014-03-28 | 2014-08-06 | 南京航空航天大学 | Microstrip dual-passband filter |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN106972228A (en) * | 2017-03-30 | 2017-07-21 | 深圳市深大唯同科技有限公司 | A kind of high selectivity balun wave filter based on line of rabbet joint form |
-
2018
- 2018-10-25 CN CN201811252849.2A patent/CN109301425A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203760606U (en) * | 2014-03-28 | 2014-08-06 | 南京航空航天大学 | Microstrip dual-passband filter |
| CN103956545A (en) * | 2014-04-23 | 2014-07-30 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN105990629A (en) * | 2015-01-30 | 2016-10-05 | 南京理工大学 | Broadband three-mode Balun band-pass filter based on E multi-mode resonators |
| CN106972228A (en) * | 2017-03-30 | 2017-07-21 | 深圳市深大唯同科技有限公司 | A kind of high selectivity balun wave filter based on line of rabbet joint form |
Non-Patent Citations (2)
| Title |
|---|
| HUI CHEN 等: "A novel microstrip bandpass filter with an ellipticfunction response using improved dual-stub resonator", 《JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS》 * |
| LI GAO等: "Novel Multi-Stub Loaded Resonators and Their Applications to Various Bandpass Filters", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676153A (en) * | 2021-08-09 | 2021-11-19 | 成都频岢微电子有限公司 | High-inhibition-degree circuit structure, high-isolation-degree duplexer and multiplexer |
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