CN208706828U - A kind of symmetric double detail parallel resonator and bandpass filter - Google Patents
A kind of symmetric double detail parallel resonator and bandpass filter Download PDFInfo
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Abstract
The utility model discloses a kind of symmetric double detail parallel resonator and bandpass filters, the parallel resonator includes: parallel to each other and symmetrical open circuit conductor and short-circuit conductor, the corresponding open circuit detail of conductor of opening a way, short-circuit conductor corresponds to short branch, open circuit detail and short branch decoupling are combined into the resonator, the utility model can generate multiple transmission zeros, and circuit topology is simple and effective；Relative ease is not only designed, but also dead-center position can be by open circuit or short branch and the length of transmission line of electrical connection come independent control, thus is easily adjusted zero point；Meanwhile compared with traditional high-order detail line band-pass filter, the size of entire circuit is more compact and minimizes.
Description
Technical field
The utility model relates to electronic information technical fields, and in particular, to a kind of symmetric double detail parallel resonator and
Bandpass filter.
Background technique
Radio-frequency filter is usually realized inside the receiver of wireless system, to the inhibition index in adjacent transmission frequency band
It is required that it is extremely stringent, emit (TX) power to protect them from possible damage and to reduce it.Present these problems are
Theme as the research of microwave planar filter.Wherein, have the bandpass filter of transmission zero response because its is with higher
Frequency selectivity, thus in the systems such as Modern wireless communication and radar using more and more extensive.Traditional detail list in parallel
Member is λ by lengthg0/2(λg0It is the guide wavelength on respective media substrate) open-circuit resonant device is connected on main transmission line, such as Fig. 1
It is shown, in Fig. 1, Z1、θ1It is the open a way characteristic impedance and electrical length of single detail A respectively, and w1、l1It is then single detail A corresponding respectively
Width and length.YAIt is the input admittance of single detail A.In figure, then several independent detail units in parallel are by length
λg0/ 4 unit transmission line successively cascades, and finally obtains required filter response.The electrical model of the quasi-belt ventilating filter such as Fig. 2
It is shown, in Fig. 2, l1a, l1bIt is the length of two open circuit details, Y respectivelyiaAnd Yib(i=1,2 ..., n) is corresponding open circuit branch respectively
The Characteristic mobility of section；l1,2..., ln-1,nIt is the length of each concatenation unit on main transmission line, Y respectivelyi,i+1(i=1,2 ..., n-
1) be then each concatenation unit on main transmission line Characteristic mobility；Y0It is that the feature of branch line filter input and output port is led
It receives.In Fig. 2, each open circuit detail length l in parallel1a+l1b=l2a+l2b=...=ln-1a+ln-1b=lna+lnb=λg0/ 2, its
Characteristic mobility is YiaAnd Yib(i=1,2 ..., n)；The length l of each concatenation unit on main transmission line1,2=...=ln-1,n=λg0/
4, its Characteristic mobility is Yi,i+1(i=1,2 ..., n-1)；The Characteristic mobility of input and output port is Y0.Although traditional open circuit
Detail line filter can obtain transmission zero, but also can only obtain two transmission zeros and (be located at f0/ 2 and 3f0/ 2 is attached
Closely).Moreover, there are larger-size defects for traditional open circuit detail line filter.Fig. 3 elaborates a kind of by traditional single detail
Open-circuit resonant device passes through the five rank Filter Principle figures that cascaded transmission line unit constructs.In figure, open circuit detail length is half-wavelength,
And the length of concatenation unit is quarter-wave.It will be apparent that when the order n of traditional detail line filter it is very high (for example, n >=
5) when, the size of entire circuit will be increased considerably.
In traditional single detail open circuit and band pass filter, in order to obtain highly selective band-pass response, usually need
Want the low-pass prototype structure of high-order (for example, 5 ranks or more).So, when line filter needs multiple a quarters
When the cascaded transmission line unit of guide wavelength is attached, length of the entire circuit along main transmission line direction is approximately (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.
To sum up, in traditional open circuit detail line band-pass filter in parallel, due to concatenation unit each on main transmission line
Length is a quarter guide wavelength, the length of each detail in parallel is half guide wavelength, therefore, such filter
Circuit size is usually larger.Meanwhile the transmission zero (Transmission Zeros, be denoted as TZs) of this kind of classical filter device is a
Number is few, only in f0/ 2 and 3f0/ 2 (wherein, f0It is the centre frequency of bandpass filter) nearby there are transmission zeros.Therefore, such
The frequency selectivity of open circuit detail line filter is poor, and the position of transmission zero is difficult to control.
Utility model content
Based on above-mentioned conventional filter, that there are sizes is larger, transmission zero number is limited and cannot independently regulate and control dead-center position lacks
It falls into, the utility model proposes the parallel symmetric double branch filters and its design method with electrical connection transmission line.Not only
The position of independent regulation transmission zero, and more transmission zeros can be obtained.Meanwhile correcting symmetric double branch filter only
Less order (for example, third-order filter) is needed to can be obtained than traditional single branch filter better performance.It is therefore proposed that
Correcting double branch filters can be effectively reduced circuit size.In conclusion the utility model can effectively solve the problem that traditional list
Detail parallel filter size is larger and the poor shortcoming and defect of frequency selectivity.
To realize above-mentioned purpose of utility model, this application provides a kind of symmetric double detail parallel resonator, the parallel connections
Resonator includes: parallel to each other and symmetrical open circuit conductor and short-circuit conductor, the corresponding open circuit detail of open circuit conductor, short-circuit conductor pair
Short branch is answered, open circuit detail and short branch decoupling are combined into the resonator.
Present invention also provides a kind of symmetric double detail bandpass filter, the bandpass filter includes:
Main transmission line, several amendment symmetric double details；Several amendment symmetric double details are connected in parallel on main transmission line, described
Amendment symmetric double detail includes: open circuit conductor, short-circuit conductor, electrical connection transmission line；Wherein, open circuit conductor and short-circuit conductor are mutual
It is parallel and symmetrical, one end open circuit for conductor of opening a way, one end ground connection of short-circuit conductor, the other end and short-circuit conductor of conductor of opening a way
The other end pass through electrical connection transmission line connect with main transmission line, open circuit conductor and short-circuit conductor between spacing be
0.5mm, the via diameter of short-circuit conductor are 0.5mm.
The utility model is from new design angle, first by symmetrical open/short conductor configuration double details parallel,
Then in parallel with main transmission line by introducing electrical connection transmission line.This new structure is defined as amendment symmetric double detail
(Modified symmetrical dual-stub,MSDS).This design method efficiently solves the single detail of tradition open circuit
Parallel filter there are the problem of.Double branch section structures not only minimize filter, but also introduce multiple transmission zero (Multi-
Transmission Zeros, is denoted as MTZs) improve bandpass filter frequency selectivity.In addition, being configured by uncoupling, most
Influencing each other between parallel double details is reduced, big degree to simplify circuit design.
Further, parallel symmetrical open circuit conductor is combined into the double details of open, short simultaneously by decoupling with short-circuit conductor
Join resonator.
Further, the bandpass filter further include: the bandpass filter further include: dielectric substrate, cavity；Open circuit
Conductor and short-circuit conductor are arranged on dielectric substrate, and open circuit conductor and short-circuit conductor and its dielectric substrate of attachment are arranged at chamber
In vivo.
Further, the spacing between symmetrical 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 amendment symmetric double detail includes:
The corresponding open circuit detail of conductor of opening a way, short-circuit conductor correspond to short branch, and open circuit and the input of short branch parallel connection are led
Receive YiAAre as follows:
YiA=1/ZiA=jYo.ctanθo.c-jYs.ccotθs.c (1.1)
Wherein, ZiAIt is input impedance, 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, j is imaginary part unit；
Above-mentioned admittance is θ using electrical lengthcThe transformation of electrical connection transmission line after, obtain correcting the defeated of double detail B
Enter admittance YiBAre as follows:
The condition of resonance for correcting double detail B can be acquired by above formula (1.2), i.e.,
Yo.ctanθo.c+Yctanθc-Ys.ccotθs.c=0 (1.3)
Wherein, Zc、Yc、θcIt is characteristic impedance, Characteristic mobility and the electrical length for being electrically connected transmission line respectively.
Further, the design equation of symmetric double detail bandpass filter includes:
The concatenation matrix for correcting double detail B, i.e. abcd matrix can be acquired by formula (1.2):
Therefore, total concatenation matrix [ABCD] of filtertAre as follows:
Wherein, main transmission line matrix [ABCD]msIt is provided by following equation:
By the transmission coefficient of the available filter of above-mentioned abcd matrix, i.e. S21:
Wherein, YiBpIt is a input admittance for correcting double detail resonators of pth (=1,2,3), Zms、Yms、θmsIt is s respectively
The characteristic impedance, Characteristic mobility and electrical length of (s=1,2) a main transmission line, A, B, C and D are each of total concatenation matrix respectively
Component, Z0It is the system impedance of filter.
Further, several amendment symmetric double details are respectively positioned on the same side of main transmission line.
On the other hand, present invention also provides a kind of design method of symmetric double detail bandpass filter, the symmetric doubles
Detail bandpass filter is mentioned-above symmetric double detail bandpass filter, and the design method includes:
Step 1: determining the interval S between symmetrical parallel open circuit conductor and short-circuit conductor0；
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 group (i.e. equation group 1.1-1.7) 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 symmetric double detail bandpass filter parameter obtained based on step 3 carries out bandpass 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) open circuit conductor and short-circuit conductor are located at the same side of main transmission line by parallel mode, so just than two
The two sides that a conductor is respectively placed in main transmission line are more compact, so that circuit size be made to greatly reduce；
(2) open circuit conductor and short-circuit conductor are in parallel by uncoupling mode, therefore to the calculating still class of double branch section structures
Two independent conductors are similar to, so that filter design more simplifies；
(3) open circuit conductor and short-circuit conductor are made up of electrical connection transmission line corrects pair detail resonators, increases and sets
Meter corrects the free variable of double details, to increase the flexibility of filter design；
(4) opening a way conductor, short-circuit conductor and electrical connection transmission line can be with independent control transmission zero location, also
It is to say that the above-mentioned geometric parameter of control transmission zero location is independent, to increase the adjustability of filter design.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment；
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 a traditional five rank bandpass filter structures schematic diagram of single detail；
Fig. 4 is the electrical model schematic diagram for correcting symmetric double detail；
Fig. 5 is novel double-support section bandpass filter topological structure schematic diagram in the application；
Fig. 6 is the design method flow diagram for correcting symmetric double detail bandpass filter；
Fig. 7 is the PCB domain for correcting three rank bandpass filter of symmetric double detail；
Fig. 8 is the transmission response schematic diagram for correcting three rank bandpass filter of symmetric double detail.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the case where not conflicting mutually,
Feature in embodiments herein and embodiment can be combined with each other.
Many details are explained in the following description in order to fully understand the utility model, still, this is practical
It is novel to be implemented using other different from the other modes being described herein in range, therefore, the protection of the utility model
Range is not limited by the specific embodiments disclosed below.
The utility model proposes double detail parallel resonator (the Dual-stub parallel of open, short
Resonator is denoted as DSPR) it is a very easily solution, because they allow to control the two of a band logical two sides
A attenuation band.DSPR is to be combined by two parallel symmetrical (i.e. isometric, wide) open, short details by decoupling, this
The detail of two different terminals load can all generate the respectively transmission zero about fundamental resonance condition, thus form two differences
Height frequency range stopband.In this way, band-pass response can be obtained based on above-mentioned lower and higher transmission zero.According to available parameter
Quantity and each stopband structure initial characteristic, DSPR allow the following parameter of independent control: (1) pole in passband；
(2) transmission zero in low-resistance belt；(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 utility model introduces electrical connection transmission line on the basis of DSPR, obtains amendment symmetric double detail, electrical model such as figure
Shown in 4, in Fig. 4, YiAIt is the input admittance of symmetric double detail, YiBIt is the input admittance for correcting symmetric double detail；Yo.c、θo.cPoint
It is not the Characteristic mobility and electrical length of open circuit detail, Ys.c、θs.cIt is the Characteristic mobility and electrical length of short branch, Z respectivelyc、θcPoint
It is not 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.cIt is the width and length of short branch, w respectivelyc、lcIt is the width and length for being electrically connected transmission line respectively.
The utility model proposes filter topology as shown in figure 5, in Fig. 5, YiA1, YiA2, YiA3It is three right respectively
Claim the input admittance of double detail A1, A2 and A3, YiB1, YiB2, YiB3It is the defeated of three amendments symmetric double detail B1, B2 and B3 respectively
Enter admittance；Zo.c、Zs.cIt is the characteristic impedance of open circuit detail and short branch, θ respectivelyo.ci、θs.ciIt (i=1,2,3) is open circuit respectively
The electrical length of detail and short branch, Zc、θciIt (i=1,2,3) is the characteristic impedance and electrical length for being electrically connected transmission line respectively；
wo.c、lo.ci(i=1,2,3) is the width and length of open circuit detail, w respectivelys.c、ls.ciIt (i=1,2,3) is short branch respectively
Width and length.wc、lciIt (i=1,2,3) is the width and length for being electrically connected transmission line respectively；Zmi, θmi(i=1,2) then
It is the characteristic impedance and electrical length of each concatenation unit on main transmission line, Wmi, lmi(i=1,2) is then each grade on main transmission line
The width and length of receipts or other documents in duplicate member.Z0It is the characteristic impedance of filter input and output port.For the ease of independent regulation transmission zero
Point, it can be assumed that: the interval S of parallel double details0Should be sufficiently large, so as to two conductor resonator uncouplings.In this way to double branch
The influence of section transmission performance almost can be ignored, and account for so that double details are considered as two independent resonators.
Therefore, for the ease of design, the open circuit of consideration parallel connection and short branch first is synthesized in uncoupling
The approximate resonance equation of resonator.It is obtaining design initial value and then full-wave electromagnetic field is carried out to resonance circuit and its filter
Simulation and optimization design.
Correct the Resonance Equation of double details:
The approximate input admittance Y of open circuit and short branch parallel connectioniAIt is as follows,
YiA=1/ZiA=jYo.ctanθo.c-jYs.ccotθs.c (1.1)
Above-mentioned admittance is θ using electrical lengthcThe transformation of electrical connection transmission line after, obtain correcting the close of double detail B
Like input admittance YiBIt is as follows,
The condition of resonance for correcting double detail B can be acquired by above formula (1.2), i.e.,
Yo.ctanθo.c+Yctanθc-Ys.ccotθs.c=0 (1.3)
By (1.3) formula it is found that the condition of resonance for correcting double detail B increases the Characteristic mobility Y of electrical connection transmission linecWith
Electrical length θc, thus design freedom is increased, so that the design of entire resonance filter becomes more convenient and easy to accomplish.
Based on the Design of Bandpass equation for correcting double detail B:
According to the above-mentioned discussion to double detail B are corrected, the Approximate Design equation of filter can be derived.
The concatenation matrix (i.e. abcd matrix) for correcting double detail B can be acquired by formula (1.2),
Therefore, total concatenation matrix of filter is,
Wherein, main transmission line matrix is provided by following equation,
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.
Three rank MTZs bandpass filters
Infinitive non trivial solution that formula (1.3) provides is discussed first.Due to there are six variables in the equation (i.e.
Yo.c, Ys.c, Yc, θo.c, θs.cAnd θc), it is clear that, it is impossible to there is determining solution.The design objective of filter joint, can be right
Above-mentioned equation carries out simplifying processing: (1) double details meet wide and isometric condition, i.e., double details are symmetrical；(2) You Shuanzhi
It saves the double details of amendment for being electrically connected transmission line composition with it and meets isometric condition；(3) it is electrically connected the width etc. of transmission line
In the sum of symmetric double branch byte wide and its spacing.
The utility model proposes filter be applied to WiMAX (Worldwide Interoperability for
Microwave Access, the global interconnection intercommunication of inserting of microwave) system, working frequency 3.5GHz.Based on amendment symmetric double
Three rank Design of Bandpass processes of detail are as shown in fig. 6, its basic step can be summarized as follows: (1) passing through calculating or electricity
Road analysis determines the minimum spacing S of parallel double detail uncouplings0；(2) filter joint aggregative formula (1.1)-(1.7) utilize
Computer aided design software determines the initial value of circuit parameter, and electromagnetic simulation software is recycled to optimize geometric dimension；(3) meet filter
After wave device technical indicator, makes PCB (Printed circuit board, printed circuit board) and circuit is tested.
The PCB geometry of the WiMAX filter of final design is routed as shown in fig. 7, in Fig. 7, Li (i=1,2,3) is respectively
The length of open circuit conductor and short-circuit conductor in i-th of symmetric double detail, Ws are short-circuit conductor and open circuit conductor in symmetric double detail
Width, Ls2, Ls3 be respectively the 2nd and the 3rd electrical connection transmission line length, Wsm be electrically connected transmission line width,
Wm and Lm is the width and length of main transmission line concatenation unit respectively, and the design result of the filter is provided by Fig. 8.Thus may be used
See, the utility model proposes bandpass filter obtain good transmission characteristic, and it is right in the response approximation of upper and lower stopband
Claim.In fig. 8, the transmission characteristic of the filter is as follows: minimum insertion loss appears in 3.51GHz, value IL=in passband
1.0dB；The centre frequency of passband is 3.49GHz, and its 3-dB fractional bandwidth FBW=10.8%；Maximum return loss in passband
Appear in 3.51GHz, value RL=-20.6dB；In addition, six designed to improve the frequency selectivity of the filter
Transmission zero is distributed in upper and lower two edges of passband, also observes in fig. 8, they are -59.8dB/2.14GHz respectively, -
54.8dB/2.32GHz, -55.0dB/2.65GHz, -56.5dB/4.32GHz, -53.4dB/4.69GHz and -63.9dB/
5.15GHz.Due to the detail line filter based on traditional single detail parallel connection only there are two transmission zero, the utility model
The filter construction and design method of it is proposed can significantly improve the performance of bandpass filter.
The filter effective dimensions finally realized is 0.46 λg0×0.43λg0.Wherein, λg0At filter centre frequency
Guide wavelength.Since the five rank filter geometric dimensions based on traditional single detail parallel connection are approximately 1.0 λg0×0.5λg0.Therefore,
The utility model proposes amendment symmetric double detail bandpass filter structures it is more compact.
The utility model is using parallel double detail uncoupling connection methods.Can not only it be increased by this method
The number of transmission zero changes parallel detail length individually to realize the independent control of transmission zero, and because two single branch
Section is not placed in the both sides up and down of main transmission line and makes circuit structure still very compact.
The method of the tunable double detail resonators of building described in the utility model.It is introduced parallel by open-circuit list detail
Short branch to increase the number of transmission zero, connect by the transmission line for then meeting electrical connection with one.Further increase in this way
The flexibility of control transmission zero location is added.
Bandpass filter structures described in the utility model.The utility model proposes the double details of short circuit-open circuit keep pair
Claim (isometric wide), therefore reduces the number of independent variable in circuit, and then achieve the purpose that simplified circuit design.It provides simultaneously
The length of transmission line of row detail electrical connection differs, to control the position of transmission zero.
The utility model proposes the geometries and design method of a kind of novel microstrip bandpass filter.This structure energy
Multiple transmission zeros are enough generated, circuit topology is simple and effective.Relative ease is not only designed, but also dead-center position can pass through open circuit
Or short branch and the length of transmission line of electrical connection carry out independent control, thus it is easily adjusted zero point.Meanwhile with traditional height
Rank 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 in the application, 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
Transmission line concatenation unit concatenates.But often size is larger, transmission zero number is few for this design, and design process
It is more complicated and cumbersome.The above method is in the regulation of transmission zero location and inconvenient and flexible, main in parallel by adjusting
The length of single branch nodel line is realized.The deficiency of above structure and method is exactly problem to be solved in the utility model.To sum up institute
It states, a kind of design scheme for the compact branch nodel line filter circuit that easily designed and transmission zero location is easy to adjust is at present also not
It appears in the newspapers.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the scope of the utility model.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (6)
1. a kind of symmetric double detail parallel resonator, which is characterized in that the parallel resonator includes: parallel to each other and symmetrical
Open circuit conductor and short-circuit conductor, the corresponding open circuit detail of open circuit conductor, short-circuit conductor correspond to short branch, and open circuit detail is propped up with short circuit
Section decoupling is combined into the resonator.
2. a kind of symmetric double detail bandpass filter, which is characterized in that the bandpass filter includes:
Main transmission line, several amendment symmetric double details；Several amendment symmetric double details are connected in parallel on main transmission line, the amendment
Symmetric double detail includes: open circuit conductor, short-circuit conductor, electrical connection transmission line；Wherein, open circuit conductor is mutually equal with short-circuit conductor
Row and symmetrical, one end open circuit for conductor of opening a way, one end ground connection of short-circuit conductor, the other end of conductor of opening a way and short-circuit conductor it is another
One end passes through electrical connection transmission line and connect with main transmission line.
3. symmetric double detail bandpass filter according to claim 2, which is characterized in that parallel to each other and symmetrical open circuit
Conductor and short-circuit conductor pass through decoupling and are combined into symmetric double detail parallel resonator.
4. symmetric double detail bandpass filter according to claim 2, which is characterized in that the bandpass filter also wraps
It includes: dielectric substrate, cavity；Open a way conductor and short-circuit conductor is arranged on dielectric substrate, open a way conductor and short-circuit conductor and its attached
Dielectric substrate be respectively provided in the cavity.
5. symmetric double detail bandpass filter according to claim 2, which is characterized in that symmetrical parallel open circuit conductor with
Spacing between short-circuit conductor is S0, S0Range be greater than equal to 0.5mm.
6. symmetric double detail bandpass filter according to claim 2, which is characterized in that several amendment symmetric double details are equal
Positioned at the same side of main transmission line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224207A (en) * | 2020-01-13 | 2020-06-02 | 电子科技大学 | Broadband power divider |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111224207A (en) * | 2020-01-13 | 2020-06-02 | 电子科技大学 | Broadband power divider |
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