CN109411862A - The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method - Google Patents
The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method Download PDFInfo
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- CN109411862A CN109411862A CN201811252866.6A CN201811252866A CN109411862A CN 109411862 A CN109411862 A CN 109411862A CN 201811252866 A CN201811252866 A CN 201811252866A CN 109411862 A CN109411862 A CN 109411862A
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- 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
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
Abstract
The invention discloses a kind of asymmetric double detail parallel resonators and bandpass filter and design methods of opening a way, the resonator includes: two open circuit conductors parallel to each other, the length and width of 2 open circuit conductors is all different, the corresponding open circuit detail of conductor of opening a way, two open circuit detail decouplings are combined into the resonator, the invention proposes parallel asymmetric double branch filters with electrical connection transmission line, not only independently regulate and control the position of transmission zero, but also can obtain more transmission zeros；Meanwhile double branch filters only need less order to can be obtained than traditional single branch filter better performance；Therefore, circuit size can be effectively reduced in double branch filters；The present invention can effectively solve the problem that traditional single detail parallel filter size is larger and the poor shortcoming and defect of frequency selectivity.
Description
Technical field
The present invention relates to electronic information technical fields, and in particular, to a kind of asymmetric double detail parallel resonators of opening a way
And bandpass filter and design method.
Background technique
In Modem radio subsystem, it is front end component that high frequency filter, which is essential,.Radio frequency front-end filter master
It is used to that useful signal approximation to be made to pass through without loss, and useless or interference signal is allowed farthest to decay.Therefore, filter is improved
The frequency selectivity of wave device is extremely important, and the damping capacity of especially passband to stopband edge is particularly critical.The above problem is
Theme as microwave filter research.Wherein, the bandpass filter with transmission zero response is because of its frequency with higher
Selectivity, thus be widely applied in modern wireless communication systems.Common detail unit in parallel is λ by lengthg/ 2 open circuit
Resonator is directly connected with main transmission line, as shown in Figure 1, in Fig. 1, Z1、θ1It is characteristic impedance and the electricity of the single detail A of open circuit respectively
Length, and w1、l1It is then the corresponding width of single detail A and length respectively.YAIt is the input admittance of single detail A.Then, Ruo Ganyu
The detail unit of main transmission line parallel connection is λ by lengthg/ 4 transmission line unit successively cascades, and finally obtains required frequency and rings
It answers.The electrical model of the quasi-belt ventilating filter is as shown in Fig. 2, in Fig. 2, l1a, l1bIt is the length of two open circuit details, Y respectivelyia
And Yib(i=1,2 ..., n) is the Characteristic mobility of corresponding open circuit detail respectively；l1,2..., ln-1,nIt is each on main transmission line respectively
The length of a concatenation unit, Yi,i+1(i=1,2 ..., n-1) is then the Characteristic mobility of each concatenation unit on main transmission line；Y0It is
The Characteristic mobility of branch line filter input and output port.Its characteristics are as follows: (1) each open circuit detail in parallel length (=
l1a+l1b) it is equal to λg/ 2, its Characteristic mobility is denoted as YiaAnd Yib(i=1,2 ..., n)；(2) each concatenation unit on main transmission line
Equal length (i.e. l1,2=...=ln-1,n=λg/ 4), its Characteristic mobility is denoted as Yi,i+1(i=1,2 ..., n-1)；(3) input and
The Characteristic mobility of output port is denoted as Y0.Although traditional open circuit detail line filter can obtain transmission zero, also can only
It obtains two transmission zeros and (is located at f0/ 2 and 3f0Near/2).Moreover, there are larger-size defects for this kind of filter, it is special
It is not that circuit size is bigger when the order of filter is higher.
In traditional open circuit list detail and band pass filter, in order to obtain highly selective band-pass response, usually need
Want high-order (for example, 5 ranks or more) low-pass prototype structure.So, line filter needs multiple a quarter guided waves
The concatenation unit of wavelength is attached.Therefore, approximate length of the circuit along main transmission line direction will be (n-1) λg0/4.It will be apparent that
With the increase of branch joint number n in parallel, finally obtained filter geometric dimension will be dramatically increased.
Traditional detail line filter can only obtain two transmission zeros, and be distributed in passband central frequency f0F0/2
And 3f0At/2.It can be seen that such filter Out-of-band rejection performance is undesirable, the decaying of especially passband edge is limited, causes
The frequency selectivity of filter is very poor.Once then its transmission zero is non-adjustable moreover, the working frequency of filter has determined.Cause
This, traditional detail line filter cannot be independently controlled transmission zero, this makes troubles to circuit design.
Summary of the invention
Based on above-mentioned filter, that there are sizes is larger, transmission zero number is limited and cannot independently regulate and control dead-center position defect,
The invention proposes parallel asymmetric double branch filters with electrical connection transmission line, not only independently regulate and control transmission zero
Position, and more transmission zeros can be obtained；Meanwhile double branch filters only need less order to can be obtained than tradition
Single branch filter better performance；Therefore, circuit size can be effectively reduced in double branch filters；In conclusion this hair
It is bright to can effectively solve the problem that traditional single detail parallel filter size is larger and the poor shortcoming and defect of frequency selectivity.
For achieving the above object, described humorous this application provides a kind of asymmetric double detail parallel resonators of opening a way
Vibration device include:
The length and width of two open circuit conductors parallel to each other, 2 open circuit conductors is all different, and open circuit conductor correspondence is opened
Road detail, two open circuit detail decouplings are combined into the resonator.
Present invention also provides a kind of asymmetric double detail bandpass filters, the bandpass filter includes:
Main transmission line, the asymmetric double details of several amendments；The asymmetric double details of several amendments are connected in parallel on main transmission line,
The asymmetric double details of the amendment include: 2 open circuit conductors, electrical connection transmission line；Wherein, two open circuit conductors are mutually equal
The length and width of row, two open circuit conductors is all different, and one end of two open circuit conductors is opened a way, two the another of conductor of opening a way
One end passes through electrical connection transmission line and connect with main transmission line.
In general, in simultaneously receipts or other documents in duplicate detail and the unit cascaded structure of main transmission line, due to needing higher order,
The geometric dimension of such filter is larger.Moreover, TZs (Transmission Zero, transmission zero) number of such filter
It is few, only it is distributed in f0/ 2 and 3f0/2(f0It is the centre frequency of bandpass filter) near.In addition, the position of such TZs is not allowed yet
Easily adjustment.Therefore, the frequency selectivity of such open circuit detail line filter is poor, and the position of transmission zero is difficult to control.This
Invention from new design angle, first by asymmetric open circuit conductor configuration parallel double details (that is, the length of two details
It is unequal with width), then obtain the asymmetric double details of amendment by introducing electrical connection transmission line, finally again with main transmission
Line is in parallel.This circuit structure and design method effective solution traditional open circuit single detail parallel filter there are the problem of.
Since asymmetric double details introduce more adjustable parameters, thus the design of circuit is more flexible.Based on this dissymmetrical structure
Filter, the order (filter proposed by the present invention only has two ranks) that can not only reduce circuit makes its miniaturization, Er Qieyin
To produce the frequency selectivity that multiple transmission zeros (Multi-transmission Zeros, be denoted as MTZs) make filter
Improved.In addition, configuring by uncoupling, influencing each other between parallel double details is farthest reduced, so that
The design of filter is simpler.
Further, 2 open circuit conductors are combined into asymmetric double detail parallel resonators by decoupling.
Further, the bandpass filter further include: the bandpass filter further include: dielectric substrate, cavity；Open circuit
Conductor is arranged on dielectric substrate, and the dielectric substrate of open circuit conductor and its attachment is respectively provided in the cavity.
Further, the spacing between parallel open circuit conductor and short-circuit conductor is S0, S0Range be greater than and be equal to
0.5mm。
Further, the Resonance Equation of the asymmetric double details of amendment includes:
The input admittance Y of the asymmetric double detail D of amendmentiDCan by following formula approximate representation,
It is hereby achieved that the approximate resonance equation of the asymmetric double detail D of amendment,
Y1tanθ1+Y2tanθ2+Yctanθc=0 (1.2).
Wherein, Y1、Y2、θ1、θ2It is the Characteristic mobility and electrical length of two open circuit details respectively；Zc、Yc、θcIt is electrical respectively
Characteristic impedance, Characteristic mobility and the electrical length of transmission line are connected, j is imaginary part unit.
Further, the design equation of asymmetric double detail bandpass filters includes:
The input admittance of the asymmetric double detail D1 of amendment is as follows:
It is hereby achieved that the Resonance Equation of the asymmetric double detail D1 of amendment:
Y1tanθ1+Y2tanθ2+Yctanθc1=0 (1.4)
Wherein, YD1The input admittance of the asymmetric double detail D1 of amendment；θ1、θ2It is asymmetric double details D1 two of amendment respectively
The electrical length of open circuit detail, θc1It is its electrical length for being electrically connected transmission line；
Similarly, the input admittance of the asymmetric double detail D2 of available amendment is as follows:
It is hereby achieved that the Resonance Equation of the asymmetric double detail D2 of amendment:
Y1tanθ1+Y2tanθ2+Yctanθc2=0 (1.6)
Wherein, YD2The input admittance of the asymmetric double detail D2 of amendment；θ3、θ4It is asymmetric double details D2 two of amendment respectively
The electrical length of open circuit detail, θc2It is its electrical length for being electrically connected transmission line；
Therefore, the concatenation matrix equation [ABCD] of entire filtertIt can be provided by following formula:
[ABCD]t=[ABCD]D1×[ABCD]m×[ABCD]D2 (1.7)
Wherein,
The concatenation matrix [ABCD] of main transmission line concatenation unitmIt is provided by following equation:
By the transmission coefficient of the available filter of above-mentioned abcd matrix, i.e. S21:
Wherein, [ABCD]D1、[ABCD]D2It is the concatenation matrix of amendment asymmetric double detail D1 and D2, Z respectivelym、Ym、θmPoint
It is not characteristic impedance, Characteristic mobility and the electrical length of main transmission line, A, B, C and D are each component of total concatenation matrix, Z respectively0
It is the system impedance of filter.
Further, the asymmetric double details of several amendments are respectively positioned on the same side of main transmission line.
Present invention also provides a kind of design method of asymmetric double detail bandpass filters, asymmetric double detail bands
Bandpass filter is the double detail bandpass filters of the asymmetry, and the design method includes:
Step 1: determining the interval S between parallel open circuit conductor and short-circuit conductor0, open circuit conductor and short-circuit conductor length and
Width is all different；
Step 2: open a way detail and the whether successful uncoupling of short branch are judged, if so then execute step 3, if otherwise continuing
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 1.1-1.10) 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 double detail bandpass filter parameters of asymmetry obtained based on step 3 carry out bandpass filter PCB system
Make, and carries out circuit test.
One or more technical solution provided by the present application, has at least the following technical effects or advantages:
(1) two open circuit conductor is located at the same side of main transmission line, therefore than two open circuit conductors point by parallel mode
The two sides for not being placed in main transmission line are more compact, so that resonator dimensions be made to greatly reduce；
(2) two open circuit conductors are in parallel by uncoupling mode, therefore the method for handling this kind of double details is still similar to
Two independent conductors, so that circuit design is simpler；
(3) two open circuit conductors are made up of electrical connection transmission line and correct double detail resonators, due to increasing double branch
The free variable of section, so the more flexible property of circuit design；
(4) two open circuit conductors and its asymmetry and electrical connection transmission line can be with independent control transmission zero positions
It sets, since these control parameters are independent, thus increases the adjustability 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 electrical connection schematic diagram of traditional half-wavelength open circuit and receipts or other documents in duplicate detail and main transmission line；
Fig. 2 is traditional half-wavelength open circuit detail bandpass filter electrical model schematic diagram；
Fig. 3 is asymmetric double detail topological structure schematic diagrames；
Fig. 4 is the electrical model schematic diagram of the asymmetric double details of amendment；
Fig. 5 is the bandpass filter topology schematic diagram based on the asymmetric double detail D of amendment；
Fig. 6 is the mechanism of production schematic diagram of asymmetric double detail five transmission zeros of second order filter of amendment；
Fig. 7 is the design cycle schematic diagram of the asymmetric double detail bandpass filters of amendment；
Fig. 8 is the PCB domain of the asymmetric double detail second-order bandpass filters of amendment；
Fig. 9 is the transmission response schematic diagram of the asymmetric double detail second-order bandpass filters of amendment.
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.
(Dual-stub parallel resonator, is denoted as the double detail parallel resonators of open circuit proposed by the present invention
It DSPR) is a very easily solution, because they allow to control two attenuation bands of a band logical two sides.DSPR
It is to be combined by two parallel asymmetric open circuit details by decoupling, topological structure is as shown in figure 3, in Fig. 3, YiCIt is asymmetric
The input admittance of double details；Z1、Z2It is the characteristic impedance of two open circuit details, θ respectively1、θ2It is the electricity of two open circuit details respectively
Length；w1、w2It is the width of two open circuit details, l respectively1、l2It is the length of two open circuit details, S respectively0It is that two open circuits are led
Spacing between body.Z0It is the characteristic impedance of input and output port on main transmission line.The two same terminals load parallel
Detail can all generate the respectively transmission zero about fundamental resonance condition, thus form two different height frequency range stopbands.This
Sample can obtain band-pass response based on above-mentioned lower and higher transmission zero.According to the quantity of available parameter and each stopband
The initial characteristic of structure, DSPR allow the following parameter of independent control: (1) pole in passband；(2) one in low-resistance belt
Transmission zero；(3) transmission zero in high stop band.
In order to obtain better electric property, and in order to regulate and control the position of transmission zero preferably to increase flexible design
Property, the present invention introduces electrical connection transmission line on the basis of DSPR, obtains the asymmetric double detail (Modified of amendment
Asymmetrical dual-stub, MADS), electrical model is as shown in Figure 4.
Following hypothesis is done for the ease of independent regulation transmission zero: the interval S of parallel double details0Should be sufficiently large, so as to
Two conductor resonator uncouplings.Influence in this way to double detail transmission performances almost can be ignored, thus by double details
It is considered as two independent resonators to account for.
The Resonance Equation of the asymmetric double detail D of amendment:
The asymmetric double details of the amendment that this trifle proposes are as shown in figure 4, in Fig. 4, YiCIt is that the inputs of asymmetric double details is led
It receives, YiDIt is the input admittance of the asymmetric double details of amendment；Z1、Z2It is the characteristic impedance of two open circuit details, θ respectively1、θ2Respectively
It is the electrical length of two open circuit details, Zc、θcIt is the characteristic impedance and electrical length for being electrically connected transmission line respectively；w1、w2It is respectively
The width of two open circuit details, l1、l2It is the length of two open circuit details, w respectivelyc、lcIt is the width for being electrically connected transmission line respectively
Degree and length.Since double details are asymmetric, two conductor widths and length here are unequal.Firstly, passing through all-wave
Electromagnetic-field simulation come recognize in the fact that when two uniconductor open-circuit resonant devices interval S0When increasing to certain distance,
Coupling effect between two open circuit details can be ignored in the initial design of filter.Thus figure is as it can be seen that when two
Interval S between open circuit detail0After 0.5mm, transmission response is almost unchanged.
Based on the above-mentioned reasonability to double detail uncouplings it is assumed that when deriving the characterisitic parameter of the asymmetric double details of amendment
It can be handled the open circuit detail of two parallel connections as uncoupling, that is, be considered as two independent uniconductor open circuit details.Cause
This, the input admittance Y of the asymmetric double detail D of amendment shown in Fig. 4iDCan by following formula approximate representation,
It is hereby achieved that the approximate resonance equation of the asymmetric double detail D of amendment,
Y1tanθ1+Y2tanθ2+Yctanθc=0 (1.2)
The Approximate Design equation of filter:
According to the asymmetric double detail D of amendment, a kind of WCDMA (the Wideband Code of multiple transmission zeros can be designed
Division Multiple Access, Wideband-CDMA) bandpass filter.Filter topology proposed by the present invention is such as
Shown in Fig. 5, in Fig. 5, YiC1、YiC2It is the input admittance of asymmetric double detail C1 and C2, Y respectivelyiD1、YiD2Be respectively correct it is not right
Claim the input admittance of double detail D1 and D2；Z1、Z2It is the characteristic impedance of two open circuit details, θ respectively1、θ2、θ3、θ4It is four respectively
The electrical length of a open circuit detail, Zc、θc1、θc2It is the characteristic impedance and electrical length for being electrically connected transmission line respectively；w1、w2It is respectively
The width of two open circuit details, l1、l2、l3、l4It is the length of four open circuit details, w respectivelyc、lc1、lc2It is electrical connection respectively
The width and length of transmission line；Zm, θmIt is then the characteristic impedance and electrical length of concatenation unit on main transmission line, Wm, lmIt is then main biography
The width and length of concatenation unit on defeated line.In conjunction with the asymmetric double branch modal equations (1.1) of above-mentioned amendment, the filtering can be derived
The approximate transmission equation of device.
Firstly, the approximate input admittance of the asymmetric double detail D1 of amendment is as follows,
It is hereby achieved that the approximate resonance equation of the asymmetric double detail D1 of amendment,
Y1tanθ1+Y2tanθ2+Yctanθc1=0 (1.3)
Similarly, the approximate input admittance of the asymmetric double detail D2 of available amendment is as follows,
It is hereby achieved that the approximate resonance equation of the asymmetric double detail D2 of amendment,
Y1tanθ1+Y2tanθ2+Yctanθc2=0 (1.5)
Therefore, the concatenation matrix equation of entire filter can be provided by following formula approximation,
[ABCD]t=[ABCD]D1×[ABCD]m×[ABCD]D2 (1.6)
Wherein,
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, then point situation, which is discussed, generates the various conditions of transmission zero.
The mechanism of production of more transmission zeros:
According to the electric topology of the filter and above-mentioned Approximate Design equation, five, filter biographies can be gone out with qualitative analysis
The working principle of defeated zero point, as shown in Figure 6.The asymmetric double detail D1 of amendment are in interested frequency range (from 1GHz to 4GHz)
It is interior, three transmission zeros, i.e. f will be generatedz1、fz3And fz5.Wherein, fz1It is l by length1The open circuit detail fundamental frequency at place produces
It is raw, and fz5It is then fz1The second subharmonic；fz3Be then by length be l2The open circuit detail fundamental frequency at place generates；And it corrects
Asymmetric double detail D2 will generate two transmission zeros, i.e. f in interested frequency range (from 1GHz to 4GHz)z2、fz4。
Wherein, fz2It is l by length in the asymmetric double detail D2 of amendment3The open circuit detail fundamental frequency at place generates, and fz4It is then by growing
Degree is l4The open circuit detail fundamental frequency at place generates.Then, amendment asymmetric double detail D1 and D2 pass through main transmission line lmCascade
Construct WCDMA filter.So, the filter of proposition will also generate five transmission zeros, and keep with novel amendment not
The zero point that symmetric double detail D1 and D2 is generated is identical, but transmits amplitude to it and re-started superposition, to meet filter design
Index request.
The second order filter of the asymmetric double details of amendment is realized:
Filter proposed by the present invention is applied to WCDMA system, working frequency 2.0GHz.Based on the asymmetric double branch of amendment
The second-order bandpass filter design cycle of section is as shown in fig. 7, its basic step can be summarized as follows: (1) passing through calculating or circuit
Analysis determines the minimum spacing S of parallel double detail uncouplings0；(2) filter joint aggregative formula (1.1)-(1.9), utilize meter
Calculation machine Autocad determines the initial value of circuit parameter, and electromagnetic simulation software is recycled to optimize geometric dimension；(3) meet filtering
After device technical indicator, makes PCB (Printed circuit board, printed circuit board) and circuit is tested.
According to the multiple transmission zero mechanisms of production of above-mentioned filter and circuit design flow, filter joint design objective,
The PCB layout and geometric dimension of the filter are obtained, as shown in figure 8, in Fig. 8, Lsi (i=1,2,3,4) is to open for i-th respectively
The length of road conductor, Ws1, Ws2 are the width of two open circuit conductors in asymmetric double details respectively, and gs is in asymmetric double details
Spacing between two open circuit conductors, Lms, Wms are respectively the length and widths for being electrically connected transmission line, and Wm and Lm are main respectively
The width and length of transmission line concatenation unit.The transmission response of entire filter is as shown in Figure 9.It can be seen that the filter
Electric parameter is as follows: centre frequency 2.03GHz, is 1.1dB, 3-dB fractional bandwidth at 1.88GHz with interior minimum insertion loss
(FBW) 32.5%.Particularly, which shows good frequency selectivity, produces five biographies in total in upper and lower stopband
Defeated zero point, they are located at 1.24GHz, 1.36GHz, 2.88GHz, 3.54GHz and 3.78GHz, corresponding decaying point
It Wei not -48.5dB, -51.8dB, -43.9dB, -37.5dB and -41.1dB.Due to the branch nodel line filter based on traditional single detail parallel connection
Only there are two transmission zeros for wave device, and therefore, filter construction proposed by the present invention and design method can significantly improve band logical filter
The performance of wave device.
The filter effective dimensions finally realized is 0.45 λg×0.24λg.Wherein, λgFor leading at filter centre frequency
Wave wavelength.Since the five rank filter geometric dimensions based on traditional single detail parallel connection are approximately 1.0 λg×0.5λg.Therefore, this hair
The amendment symmetric double detail bandpass filter structures of bright proposition are more compact.
Heretofore described parallel double detail uncoupling connection methods.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 not because of two details
It places and makes circuit structure still very compact in upper and lower both sides.
The method of the heretofore described tunable double details of building.Parallel another is introduced not by open-circuit list detail
To increase the number of transmission zero, the transmission line that electrical connection is then met with one cascades symmetrical detail of opening a way.In this way into one
Step increases the flexibility of control transmission zero location.
Heretofore described bandpass filter structures.Double details proposed by the present invention of opening a way are asymmetric, therefore are increased
The number of independent variable, and then increase the transmission zero number of filter.
A kind of design method of novel microstrip bandpass filter proposed by the present invention.This method forms multiple transmission zeros
Mode it is simple and effective, design relative ease, and dead-center position by open circuit detail and can be electrically connected transmission line
Length carrys out independent control, thus is easily adjusted zero point.Meanwhile compared with traditional detail line band-pass filter, entire filtered electrical
The size on road is more compact.
Realize that the bandpass filtering of transmission zero responds using detail in parallel in the present invention, there are many implementations.It passes at present
The method of system is connected in parallel on main transmission line using the open circuit list detail of half-wavelength, then passes through a quarter guide wavelength again
Main transmission line concatenation unit concatenates.But often size is larger for higher order filter, transmission zero for this structure
Number is few, and design process is more complicated and cumbersome.The above method is in the tuning of transmission zero location and inconvenient and clever
It is living, it is only capable of realizing by branch pitch length.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 (9)
1. a kind of asymmetric double detail parallel resonators of opening a way, which is characterized in that the resonator includes:
The length and width of two open circuit conductors parallel to each other, 2 open circuit conductors is all different, the corresponding open circuit branch of open circuit conductor
Section, two open circuit detail decouplings are combined into the resonator.
2. a kind of asymmetric double detail bandpass filters, which is characterized in that the bandpass filter includes:
Main transmission line, the asymmetric double details of several amendments；The asymmetric double details of several amendments are connected in parallel on main transmission line, described
The asymmetric double details of amendment include: 2 open circuit conductors, electrical connection transmission line；Wherein, two open circuit conductors are parallel to each other, and two
The length and width of a open circuit conductor is all different, and one end of two open circuit conductors is opened a way, the other end of two open circuit conductors
It is connect by being electrically connected transmission line with main transmission line.
3. asymmetric double detail bandpass filters according to claim 2, which is characterized in that 2 open circuit conductors are by going
The asymmetric double detail parallel resonators of coupling composition.
4. asymmetric double detail bandpass filters according to claim 2, which is characterized in that the bandpass filter also wraps
It includes: dielectric substrate, cavity；Conductor of opening a way is arranged on dielectric substrate, and the dielectric substrate of open circuit conductor and its attachment is arranged at
In cavity.
5. asymmetric double detail bandpass filters according to claim 2, which is characterized in that parallel open circuit conductor with it is short
Spacing between the conductor of road is S0, S0Range be greater than equal to 0.5mm.
6. asymmetric double detail bandpass filters according to claim 2, which is characterized in that the asymmetric double details of amendment
Resonance Equation includes:
The input admittance Y of the asymmetric double detail D of amendmentiDCan by following formula approximate representation,
It is hereby achieved that the approximate resonance equation of the asymmetric double detail D of amendment,
Y1tanθ1+Y2tanθ2+Yctanθc=0 (1.2).
Wherein, Y1、Y2、θ1、θ2It is the Characteristic mobility and electrical length of two open circuit details respectively；Zc、Yc、θcIt is electrical connection respectively
Characteristic impedance, Characteristic mobility and the electrical length of transmission line, j are imaginary part unit.
7. asymmetric double detail bandpass filters according to claim 6, which is characterized in that asymmetric double detail band logical filters
The design equation of wave device includes:
The input admittance of the asymmetric double detail D1 of amendment is as follows:
It is hereby achieved that the Resonance Equation of the asymmetric double detail D1 of amendment:
Y1tanθ1+Y2tanθ2+Yctanθc1=0 (1.4)
Wherein, YD1The input admittance of the asymmetric double detail D1 of amendment；θ1、θ2It is asymmetric D1 two open circuits of double details of amendment respectively
The electrical length of detail, θc1It is its electrical length for being electrically connected transmission line；
Similarly, the input admittance of the asymmetric double detail D2 of available amendment is as follows:
It is hereby achieved that the Resonance Equation of the asymmetric double detail D2 of amendment:
Y1tanθ1+Y2tanθ2+Yctanθc2=0 (1.6)
Wherein, YD2The input admittance of the asymmetric double detail D2 of amendment；θ3、θ4It is asymmetric D2 two open circuits of double details of amendment respectively
The electrical length of detail, θc2It is its electrical length for being electrically connected transmission line；
Therefore, the concatenation matrix equation [ABCD] of entire filtertIt can be provided by following formula:
[ABCD]t=[ABCD]D1×[ABCD]m×[ABCD]D2 (1.7)
Wherein,
I represents D1 or D2 (1.8)
The concatenation matrix [ABCD] of main transmission line concatenation unitmIt is provided by following equation:
By the transmission coefficient of the available filter of above-mentioned abcd matrix, i.e. S21:
Wherein, [ABCD]D1、[ABCD]D2It is the concatenation matrix of amendment asymmetric double detail D1 and D2, Z respectivelym、Ym、θmIt is respectively
Characteristic impedance, Characteristic mobility and the electrical length of main transmission line, A, B, C and D are each component of total concatenation matrix, Z respectively0It is filter
The system impedance of wave device.
8. asymmetric double detail bandpass filters according to claim 2, which is characterized in that the asymmetric double branch of several amendments
Section is respectively positioned on the same side of main transmission line.
9. a kind of design method of asymmetric double detail bandpass filters, asymmetric double detail bandpass filters are wanted for right
Seek any one of double detail bandpass filters of asymmetry in 2-8, which is characterized in that the design method includes:
Step 1: determining the interval S between parallel open circuit conductor and short-circuit conductor0, open a way conductor and short-circuit conductor length and width
It is all different；
Step 2: open a way detail and the whether successful uncoupling of short branch are judged, 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 double detail bandpass filter parameters of asymmetry obtained based on step 3 carry out bandpass filter PCB production, and
Carry out circuit test.
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