CN107403982A - Broadband variable band-pass filter based on step impedance resonator and preparation method thereof - Google Patents
Broadband variable band-pass filter based on step impedance resonator and preparation method thereof Download PDFInfo
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- CN107403982A CN107403982A CN201710695562.6A CN201710695562A CN107403982A CN 107403982 A CN107403982 A CN 107403982A CN 201710695562 A CN201710695562 A CN 201710695562A CN 107403982 A CN107403982 A CN 107403982A
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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
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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
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Abstract
The invention discloses a kind of broadband variable band-pass filter based on step impedance resonator and preparation method thereof,Wave filter includes the step impedance resonator of two varactor loadings of mirror image each other,There is a coupling gap between two step impedance resonators,Each step impedance resonator includes four/wavelength transmission line,Four/the wavelength transmission line is made up of the high-impedance transmission line and low impedance transmission line being electrically connected to each other,High-impedance transmission line end connects a variable capacitance,The variable capacitance includes the varactor and lumped parameter electric capacity,The low-impedance transmission thread end short circuit,Wherein,High-impedance transmission line accounts for the 0.6 of the physical length of whole four/wavelength transmission line,The routine that the impedance of the high-impedance transmission line is more than corresponding to it presets impedance,The routine that the impedance of low impedance transmission line is less than corresponding to it presets impedance.The present invention can widen frequency-adjustable scope, enable to the adjustable extent of the resonant frequency of the resonator to reach a maximum.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of broadband adjustable band based on step impedance resonator
Bandpass filter and preparation method thereof.
Background technology
Due to wireless communication technology now fast development, it is necessary to communication system can be operated in multiple frequency ranges small to meet
The purpose of type, integrated and reduced cost, so adjustable/reconfigurable system is the study hotspot of radio communication now, and
Tunable filter is got the attention as an indispensable part in communication system.Evaluate the master of tunable filter performance
Index is wanted there are two：(1) adjustable extent of centre frequency；(2) bandwidth is controlled in the range of frequency-adjustable.Recently, it is right
It is concentrated mainly in the research of tunable filter and is controlled for bandwidth, is had accordingly many constant absolute or relative bandwidth
Design is suggested, and widens not corresponding theoretical direction for the frequency-adjustable scope of tunable filter.So research
It is a kind of can instruct to widen frequency-adjustable scope method be present Research on Tunable Filters important directions.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided one kind is hindered based on step
Broadband variable band-pass filter of antiresonance device and preparation method thereof.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of width based on step impedance resonator
Band variable band-pass filter, include the step impedance resonator of two varactor loadings of mirror image each other, two steps
There is a coupling gap, each step impedance resonator includes four/wavelength transmission line, and this four between electric impedance resonator
/ wavelength transmission line is made up of the high-impedance transmission line and low impedance transmission line being electrically connected to each other, and high-impedance transmission line end connects
A variable capacitance is connect, the variable capacitance includes the varactor and lumped parameter electric capacity, the low-impedance transmission thread end
Short circuit, wherein, the high-impedance transmission line accounts for the 0.6 of the physical length of whole four/wavelength transmission line, and the high impedance passes
The routine that the impedance of defeated line is more than corresponding to it presets impedance, and the routine that the impedance of low impedance transmission line is less than corresponding to it is preset
Impedance.
Wherein, high-impedance transmission line, low impedance transmission line are formed by non-coupled portion and coupling part, and a Stepped Impedance is humorous
Shake the high-impedance transmission line of device, low impedance transmission line coupling part and another step impedance resonator high-impedance transmission line,
Form the coupling gap between the coupling part of low impedance transmission line, incoming feeder/output feeder is from the high-impedance transmission line
Non-coupled portion predetermined point FD feed to the step impedance resonator.
Preferably, a variable capacitance is also associated between the predetermined point and incoming feeder/output feeder.
A kind of preparation method of broadband variable band-pass filter is also claimed in the present invention, and method includes：
S100, two step impedance resonators are provided, wherein, each step impedance resonator includes four/wavelength
Transmission line, the four/wavelength transmission line are made up of the high-impedance transmission line and low impedance transmission line being electrically connected to each other, wherein, institute
High-impedance transmission line accounts for the physical length of whole four/wavelength transmission line 0.6 is stated, the impedance of the high-impedance transmission line is big
Impedance is preset in the routine corresponding to it, the routine that the impedance of low impedance transmission line is less than corresponding to it presets impedance；
S200, the setting by two step impedance resonators mirror image each other, and make to have between two step impedance resonators
There is a coupling gap；
S300, by high-impedance transmission line end connect a variable capacitance, the variable capacitance include the varactor and
Lumped parameter electric capacity, the low-impedance transmission thread end short circuit.
Wherein, the bias voltage of the variable capacitance of high-impedance transmission line end connection is the first DC voltage；Methods described
Also include：Frequency-adjustable is realized by changing the first DC voltage.
Wherein, high-impedance transmission line, low impedance transmission line are formed by non-coupled portion and coupling part, and a Stepped Impedance is humorous
Shake the high-impedance transmission line of device, low impedance transmission line coupling part and another step impedance resonator high-impedance transmission line,
Form the coupling gap between the coupling part of low impedance transmission line, incoming feeder/output feeder is from the high-impedance transmission line
Non-coupled portion predetermined point FD feed to the step impedance resonator；Methods described also includes：By setting coupling slot
The length of the width and high-impedance transmission line of gap, the coupling part of low impedance transmission line, makes the coupling between step impedance resonator
Syzygy number keeps constant.
Preferably, it is the second direct current that a bias voltage is also associated between the predetermined point and incoming feeder/output feeder
The variable capacitance of voltage；Methods described also includes：It is straight apart from the distance in the coupling gap and second by setting predetermined point
The size of voltage is flowed, the external sort factor of step impedance resonator is kept constant.
Implement broadband variable band-pass filter based on step impedance resonator and preparation method thereof of the present invention, have with
Lower beneficial effect：The present invention can reach the effect for widening frequency-adjustable scope of the step impedance resonator based on variable capacitance loading
Fruit, by increasing the impedance of high-impedance transmission line, reduce the impedance of low impedance transmission line, and the accounting by high-impedance transmission line
0.6 is set to, enables to the adjustable extent of the resonant frequency of the resonator to reach a maximum.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings：
Fig. 1 is the structural representation of broadband variable band-pass filter；
Fig. 2 is variable capacitance Cv1Load on the schematic diagram of resonator；
Fig. 3 is fixed Z1For 100 Ω, change Z2And the Rf curve maps that u is obtained；
Fig. 4 is fixed Z2For 50 Ω, change Z1And the Rf curve maps that u is obtained；
Fig. 5 is to work as Z1For 100 Ω, Z2When being immobilized for 50 Ω, change the Rf curve maps that u and total length l is obtained；
Fig. 6 is to work as Z1For 100 Ω, Z2When being immobilized for 50 Ω, change u and Cv1Obtained Rf curve maps；
Fig. 7 is to work as g1During=0.5mm, different L3And L4In the case of K12Change schematic diagram；
Fig. 8 is in different frequency and L5The Q extractedeSchematic diagram；
Fig. 9 is in different frequency and Cv2The Q extractedeSchematic diagram；
Figure 10 is emulation and the test result comparison diagram of a specific embodiment median filter.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the exemplary embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is made to the disclosure more thorough and comprehensive.
It should be noted that term as used herein " vertically ", " horizontal ", "left", "right" and similar table
State for illustrative purposes only.Word " identical " " constant " or other similar terms, are not limited to exhausted in mathematical term
Can be close on engineering significance or acceptable when implementing right described in this patent to equal or identical, constant
In error range.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
In order to be better understood from technical scheme, below in conjunction with Figure of description and specific embodiment
Upper technical scheme is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment
It is the detailed description to technical scheme, rather than the restriction to technical scheme, in the case where not conflicting,
Technical characteristic in the embodiment of the present invention and embodiment can be mutually combined.
The broadband variable band-pass filter of the present invention includes：The step impedance resonator of two varactor loadings, i.e.,
Two SIR.With reference to figure 1, a coupling gap 100 is formed between two SIR, and two SIR are on coupling gap 100 each other
Mirror image, by taking the SIR on the left side in Fig. 1 as an example, each SIR includes four/wavelength transmission line, and the four/wavelength transmission line is by phase
The high-impedance transmission line 10 and low impedance transmission line 20 mutually electrically connected is formed, and high-impedance transmission line 10 and low impedance transmission line 20 are equal
For the microstrip line of bending.
Specifically, high-impedance transmission line 10 is made up of horizontally disposed non-coupled portion 11 and the coupling part 12 being vertically arranged,
Low impedance transmission line 20 is formed by horizontally disposed non-coupled portion 21 and the coupling part 22 that is vertically arranged, and coupling part 12 is from non-coupling
The right-hand member in conjunction portion 11 extends to be formed downward vertically, and coupling part 22 extends vertically to be formed upwards from the right-hand member in non-coupled portion 21, coupling
Portion 12, coupling part 22 dock.Institute is formed between one of SIR coupling part 12,22 and another SIR coupling part 12,22
State coupling gap 100.
Wherein, the end direct short-circuit of low impedance transmission line 20, i.e., the left end short circuit in non-coupled portion 21.High-impedance transmission line 10
End, i.e., the left end in non-coupled portion 11, connect a variable capacitance Cv1, it is to be understood that the mode of ground connection is not limited, can be with
It is to be connected by metallization VIA with the metal of medium substrate bottom.
With reference to figure 2, specifically, variable capacitance Cv1Including radio frequency obstructing instrument RFC, varactor Cbi, lumped capacity Cai,
Varactor CbiPlus earth, varactor CbiNegative pole via lumped capacity CaiConnect high-impedance transmission line 10
End, varactor CbiNegative pole also receive DC voltage V via radio frequency obstructing instrument RFC1, DC voltage V1As transfiguration two
Pole pipe CbiBias voltage.By changing V1Size can change varactor CbiCapacitance, and then realize frequency-adjustable.
It is understood that C can also be dispensedai, lumped capacity CaiAddition primarily to preventing direct current signal V1Enter to transmit
Line influences radiofrequency signal.
In order to improve Cv1Tunability, high-impedance transmission line 10 accounts for the physical length of whole transmission line in the present embodiment
0.6, the routine that the impedance of high-impedance transmission line 10 is more than corresponding to it presets impedance, and the impedance of low impedance transmission line 20 is less than it
Corresponding routine presets impedance, and in theory, the impedance of high-impedance transmission line 10 is bigger, and the impedance of low impedance transmission line 20 is got over
Small, effect is better.
With continued reference to Fig. 1, P1, P2 represent access radio frequency incoming feeder, the terminal of radio frequency output feeder in figure.As preferred
Scheme, incoming feeder/output feeder can pass through another variable capacitance Cv2Believe from the predetermined point feed-in of high-impedance transmission line 10
Number to SIR, variable capacitance Cv2Structure and variable capacitance Cv1It is identical, only difference is that varactor CbiBiased electrical
Press as DC voltage V2.Variable capacitance C can certainly be dispensedv2, variable capacitance Cv2Addition be used for adjust external sort
Factor.Because in Coupled resonator filter, a good passband is to be cooperated by the coefficient of coup and external sort factor,
Changing frequency i.e. Cv1During change, the coefficient of coup can change, and at this time change Cv2To change external sort factor
Coordinate the coefficient of coup, the passband that can have been formed.
Describe the analysis process and effect of the present embodiment in detail below in conjunction with the accompanying drawings.
With reference to figure 1, the total length of high-impedance transmission line 10 and low impedance transmission line 20 is designated as L respectively1、L2, impedance difference
It is designated as Z1、Z2, electrical length is designated as θ respectively1、θ2.Coupling part 12, the length of coupling part 22 are designated as L respectively3、L4.With reference in figure 2, Yin
Illustrate SIR input admittance.It is C that dashed rectangle is interior in Fig. 2v1Concrete structure, C in figureaiBoth it had been used to obstruct DC voltage V1,
And can enough adjusts Cv1Total capacitance.According to transmission line theory, above-mentioned SIR input admittance can be expressed as：
In formula (2), εreFor the effective dielectric constant of medium substrate, β is propagation constant.Therefore C is worked asv1During change, f0's
Tuning range can be by condition of resonance Im [Yin]=0 is calculated.F in the present invention0Tuning range be defined as：
Wherein, f0hAnd f0lRepresent the f in whole frequency tuning range0Peak and minimum.
In a specific embodiment, it is ε to employ relative dielectric constantr=3.38 and thickness be h=0.813mm Jie
Matter substrate RO4003C.Compare for convenience, the whole physical length of resonator is fixed as L1+L2=30mm, define u=L1/(L1
+L2), work as Cv1Excursion when being fixed as from 0.5pF to 3pF, by different u and ZiThe R that (i=1 or 2) is calculatedfDraw
Into as shown in Figure 3,4.
If SIR characteristic impedance is Z1=Z2, the resonator will be changed into uniform impedance resonator (UIR), i.e., no matter u
How to change, RfAll keep constant, but it can increase with the increase of characteristic impedance, such as the horizontal linear institute table in Fig. 3,4
Show.In order to obtain result corresponding with SIR, following two situations are studied：The first situation, as shown in figure 3, changing Z2And consolidate
Determine Z1=100 Ω are constant, then RfValue can change with u change, and the R of every curvefThere is maximum.In addition, institute
Some maximums are both present in about at u=0.6, and with Z2The increase of value and increase.Another situation is to change Z1,
And Z2=50 Ω keep constant.It is also shown in FIG. 4 to calculate Rf, maximum is still in u=0.6, and with Z1The increase of value and
Increase.By comparing Fig. 3,4, it can be determined that draw, high characteristic impedance line Z1Pair with adjustment RfChange in occupy an leading position,
And in u=0.6, the adjustable extent of the resonator can reach the maximum of Theoretical Design.
On the other hand, Fig. 3,4 are built upon L1+L2In the case that=30mm is constant.If impedance value is adjusted to Z1=100
Ω and Z2=50 Ω are constant, and adjust total physical length, it is possible to obtain total physical length and between adjustable extent close
System, i.e., as shown in Figure 5.It is not difficult to draw, total length is longer, and adjustable extent is narrower.Likewise, the as shown in fig. 6, change of variable capacitance
Change scope is bigger, and adjustable extent is also equally applicable to more greatly the present invention.
Therefore, in order to obtain more broadly frequency tuning range, above-mentioned optimize can be selected in tunable filter design
Four/wavelength SIR based on varactor loading, and smaller Z2, bigger Z1And u=0.6 enables to it
Reach bigger adjustable extent.
It is discussed above in order to verify, in a specific embodiment, the SIR characteristic resistance as used in Fig. 1 wave filter
Anti- selection is Z1=100 Ω and Z2=50 Ω, that is, mean W1=0.45mm and W2=1.8mm, and whole resonator
Physical length is L1+L2=30mm.Meanwhile TOSHIBA JDV2S71E have been used as varactor Cbi, the change of its capacitance
Change scope is 6.5pF to 0.67pF.Lumped capacity have chosen Ca1=5pF, Ca2=10pF, and Cvi=CaiCbi/(Cai+Cbi), institute
With Cv1Excursion be from 0.6pF to 2.8pF, Cv2Excursion is 0.6pF to 4pF.Therefore, as u=0.6, RfMost
Big value can be calculated as 53.4%.Broadly required based on constant opposite band, in whole tuning range, two resonators it
Between coefficient of coup K12With external sort factor QeNeed to be kept approximately constant.Therefore, in order to realize 6%0.04dB corrugated ribbon
Width, K12And QeValue need to be K12=0.097 and Qe=11.3.
K12Coupling regime (L between by two coupling SIR3And L4) and coupling gap (g1) influence.In general, g1
It is main to influence K12The size of value, and L3And L4Effect can embody in the figure 7.As shown in fig. 7, at different frequencies, L3
And L4K can effectively be changed12Size and slope.Pass through appropriate selection L3, L4And g1, can be in whole tuning range
It is interior to obtain the desired K for being capable of constant relative bandwidth12Value.QeMainly determined, and can passed through by the feed placement of feeder line
C is adjusted during frequency tuningv2To cause QeReach desired value, as shown in Figure 8,9.Therefore, in whole frequency-adjustable model
In enclosing, constant relative bandwidth can be realized.
After optimization, the physical parameter of wave filter is defined as L1=18mm, L2=12mm, L3=7mm, L4=7mm, L5=3mm,
W1=0.45mm, W2=1.8mm, g1=0.5mm.The overall size of wave filter is 0.19 λg×0.19λg, wherein λgRefer to most
Guide wavelength during low frequency.Figure 10 is the comparison diagram of the emulation and test of the wave filter, and paired numeral illustrates partially in figure
Put voltage V1, V2 size.Simulation result is obtained by HFSS, and test result passes through Agilent Agilent E8363C networks point
Analyzer obtains.The bias voltage V used in actual testiFor V1=0-30V and V2=2.8-9V so that two can power transformation
The excursion of capacitance is Cv1=2.8-0.6pF and Cv2=2.7-1.2pF.As a result show, the frequency tuning model of the wave filter
Enclose from 0.6GHz to 1.015GHz, i.e. Rf=51.4%.When frequency changes from high to low, its pass band insertion loss change from
1.1dB to 2.8dB, 3-dB relative bandwidth change from 15.2% to 15.9%.The wave filter generates two biographies passband is high-end
Defeated zero point.Transmission zero compared with low frequency is by from variable capacitance Cv1(including Cv1) arrive feeder line feed point (i.e. foregoing predetermined point)
Between the resonance of λ/4 that has of transmission line caused by, higher-frequency is then by from feed point position to resonator short-circuit end
The resonance of λ/2 that has of transmission line caused by.The third order intermodulation and 1-dB positioned at 0.8GHz centre frequencies of test compress
Point is respectively 27dBm and 18dBm.
Based on conceiving with one side, the invention also discloses a kind of preparation method of broadband variable band-pass filter, including：
S100, two step impedance resonators are provided, wherein, each step impedance resonator includes four/wavelength
Transmission line, the four/wavelength transmission line are made up of the high-impedance transmission line and low impedance transmission line being electrically connected to each other, wherein, institute
High-impedance transmission line accounts for the physical length of whole four/wavelength transmission line 0.6 is stated, the impedance of the high-impedance transmission line is big
Impedance is preset in the routine corresponding to it, the routine that the impedance of low impedance transmission line is less than corresponding to it presets impedance；
S200, the setting by two step impedance resonators mirror image each other, and make to have between two step impedance resonators
There is a coupling gap；
S300, by high-impedance transmission line end connect a variable capacitance, the variable capacitance include the varactor and
Lumped parameter electric capacity, the low-impedance transmission thread end short circuit.
Wave filter after being made is as shown in figure 1, concrete structure repeats no more.
Preferably, methods described also includes：By changing the first DC voltage V1Adjust variable capacitance Cv1Capacitance with
Realize frequency-adjustable.
Preferably, methods described also includes：Passed by the width and high-impedance transmission line, Low ESR that set coupling gap
The length of the coupling part of defeated line, the coefficient of coup between step impedance resonator is set to keep constant.
Preferably, methods described also includes：It is straight apart from the distance in the coupling gap and second by setting predetermined point
Flow voltage V2Size, make step impedance resonator external sort factor keep it is constant.
In summary, broadband variable band-pass filter based on step impedance resonator and its making side of the present invention is implemented
Method, have the advantages that：The frequency of widening that the present invention can reach the step impedance resonator based on variable capacitance loading can
The effect of scope is adjusted, by increasing the impedance of high-impedance transmission line, reduces the impedance of low impedance transmission line, and high impedance is passed
The accounting of defeated line is set to 0.6, enables to the adjustable extent of the resonant frequency of the resonator to reach a maximum.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (7)
1. a kind of broadband variable band-pass filter based on step impedance resonator, it is characterised in that including two mirror images each other
Varactor loading step impedance resonator, there is a coupling gap, each between two step impedance resonators
The step impedance resonator includes four/wavelength transmission line, and the four/wavelength transmission line is by the high impedance that is electrically connected to each other
Transmission line and low impedance transmission line are formed, and high-impedance transmission line end connects a variable capacitance, and the variable capacitance includes the change
Holding diode and lumped parameter electric capacity, the low-impedance transmission thread end is short-circuit, wherein, the high-impedance transmission line accounts for whole four
The 0.6 of the physical length of/wavelength transmission line, the impedance of the high-impedance transmission line are more than the pre- handicapping of routine corresponding to it
Anti-, the routine that the impedance of low impedance transmission line is less than corresponding to it presets impedance.
2. the broadband variable band-pass filter according to claim 1 based on step impedance resonator, it is characterised in that high
Impedance transmission lines, low impedance transmission line are formed by non-coupled portion and coupling part, and the high impedance of a step impedance resonator passes
Defeated line, the high-impedance transmission line of coupling part and another step impedance resonator of low impedance transmission line, low impedance transmission line
The coupling gap is formed between coupling part, incoming feeder/output feeder is believed from the predetermined point feed-in of the high-impedance transmission line
Number to the step impedance resonator.
3. the broadband variable band-pass filter according to claim 2 based on step impedance resonator, it is characterised in that institute
State and a variable capacitance is also associated between predetermined point and incoming feeder/output feeder.
A kind of 4. preparation method of broadband variable band-pass filter, it is characterised in that including：
Two step impedance resonators are provided, wherein, each step impedance resonator includes four/wavelength transmission line, should
Four/wavelength transmission line is made up of the high-impedance transmission line and low impedance transmission line being electrically connected to each other, wherein, the high impedance
Transmission line accounts for the 0.6 of the physical length of whole four/wavelength transmission line, and the impedance of the high-impedance transmission line is right more than its institute
The routine answered presets impedance, and the routine that the impedance of low impedance transmission line is less than corresponding to it presets impedance；
By the setting of two step impedance resonators mirror image each other, and make that there is a coupling slot between two step impedance resonators
Gap；
High-impedance transmission line end is connected into a variable capacitance, the variable capacitance includes varactor and lumped parameter electric capacity,
The low-impedance transmission thread end short circuit.
5. the preparation method of broadband variable band-pass filter according to claim 4, it is characterised in that high-impedance transmission line
The bias voltage of the variable capacitance of end connection is the first DC voltage；
Methods described also includes：Frequency-adjustable is realized by changing the first DC voltage.
6. the preparation method of broadband variable band-pass filter according to claim 5, it is characterised in that high impedance transmits
Line, low impedance transmission line are formed by non-coupled portion and coupling part, high-impedance transmission line, the low-resistance of a step impedance resonator
The coupling part of anti-transmission line and the high-impedance transmission line of another step impedance resonator, low impedance transmission line coupling part between
The coupling gap is formed, incoming feeder/output feeder is believed from the predetermined point feed-in in the non-coupled portion of the high-impedance transmission line
Number to the step impedance resonator；
Methods described also includes：By the width and high-impedance transmission line, the coupling of low impedance transmission line that set coupling gap
The length in portion, the coefficient of coup between step impedance resonator is set to keep constant.
7. the preparation method of broadband variable band-pass filter according to claim 6, it is characterised in that the predetermined point with
The variable capacitance that a bias voltage is the second DC voltage is also associated between incoming feeder/output feeder；
Methods described also includes：By set predetermined point apart from it is described coupling gap distance and the second DC voltage it is big
It is small, the external sort factor of step impedance resonator is kept constant.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108493533A (en) * | 2018-05-21 | 2018-09-04 | 南通大学 | It is a kind of that there is the tunable filter for stablizing Wide stop bands |
| CN108832237A (en) * | 2018-05-08 | 2018-11-16 | 南京理工大学 | A kind of two-band reconfigurable filter based on SIR load PIN diode structure |
| CN109921761A (en) * | 2019-03-18 | 2019-06-21 | 南通大学 | It is a kind of to reconcile the reconfigurable filter of switchable function with passband |
| CN111465947A (en) * | 2017-12-15 | 2020-07-28 | 谷歌有限责任公司 | Transmission line resonator coupling |
| CN113422182A (en) * | 2021-07-02 | 2021-09-21 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN115241366A (en) * | 2022-08-03 | 2022-10-25 | 量子科技长三角产业创新中心 | Superconducting quantum chip and parameter determination method thereof |
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| CN111465947A (en) * | 2017-12-15 | 2020-07-28 | 谷歌有限责任公司 | Transmission line resonator coupling |
| CN111465947B (en) * | 2017-12-15 | 2023-12-05 | 谷歌有限责任公司 | Transmission line resonator coupling |
| CN108832237A (en) * | 2018-05-08 | 2018-11-16 | 南京理工大学 | A kind of two-band reconfigurable filter based on SIR load PIN diode structure |
| CN108493533A (en) * | 2018-05-21 | 2018-09-04 | 南通大学 | It is a kind of that there is the tunable filter for stablizing Wide stop bands |
| CN109921761A (en) * | 2019-03-18 | 2019-06-21 | 南通大学 | It is a kind of to reconcile the reconfigurable filter of switchable function with passband |
| CN109921761B (en) * | 2019-03-18 | 2023-05-05 | 南通大学 | Reconfigurable filter with passband adjustable and switchable functions |
| CN113422182A (en) * | 2021-07-02 | 2021-09-21 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN113422182B (en) * | 2021-07-02 | 2022-04-01 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN115241366A (en) * | 2022-08-03 | 2022-10-25 | 量子科技长三角产业创新中心 | Superconducting quantum chip and parameter determination method thereof |
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