CN105762466B - A kind of tool there are two can electricity adjust three band-pass filters of passband - Google Patents
A kind of tool there are two can electricity adjust three band-pass filters of passband Download PDFInfo
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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
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Abstract
The invention discloses a kind of tool there are two can electricity adjust passband three band-pass filters, microstrip line construction including upper layer, the medium substrate in middle layer, the grounding plate and metal throuth hole of lower layer, the microstrip line construction includes a pair of symmetrical multimode resonator and a pair of symmetrical input/output feed line, each multimode resonator includes a split-ring resonator and a minor matters structure, the opening of split-ring resonator passes through one group of concatenated varactor connection, minor matters structure is in " towel " font, and it loads on the outside of the center with opening opposite edge of split-ring resonator, the side minor matters line end of the minor matters structure loads a varactor, center minor matters line lower end by bending twice；Every section of input/output feed line includes a section termination short-circuit micro-band line and section termination open circuit microstrip line.First and second passband of the invention is electric can independently to adjust, and third fixed passband is controllable, and the bandwidth of three passbands is also controllable.
Description
Technical field
It is especially a kind of applied to the three restructural radio-frequency front-end systems of frequency the present invention relates to a kind of three band-pass filters
Tool there are two can electricity adjust passband three band-pass filters, belong to technical field of micro communication.
Background technique
During the rapid development of modern wireless communication systems, to multiple frequency ranges can be compatible with, multiple business are realized
System demand is increasing.And important component of the radio frequency electrically adjusted filter as radio-frequency front-end system, and there is body
The advantages such as small, the at low cost and flexibility of product, are paid more and more attention.Therefore, while multiple frequency ranges being compatible with, bandwidth is controllable, and
Centre frequency can be more attractive with the bandpass filter of flexible modulation, has weight to the research of three frequency band variable band-pass filters
Big meaning.
One-segment tunable filter has currently obtained extensive research, also has part double frequency variable band-pass filter to be reported
Road, but since three frequency band tunable filter design difficulties are big, it is more difficult to each passband of independent control, so few about more than two
The report of three frequency band tunable filters of a frequency range.
2013, Chan-Keong Chio et al. was delivered in Microwave Symposium Digest (IMS) meeting
" Novel reconfigurable multiple-band quasi-elliptic bandpass filter using
Defected ground structure " proposes the three frequency range switchable filters based on defect ground structure, the filter
It can arbitrarily switch in three working frequency range, but can not achieve the continuous fast tunable of centre frequency.
2015, Roberto G ó mez-Garc í a et al. was delivered on IEEE Transaction on MTT
" Reconfigurable multi-band microwave filters ", the multifrequency for proposing a kind of more than two frequency range can
Adjusted band-pass filter, but adjustable range is smaller, volume is larger.
In conclusion the article or patent delivered are related to one-segment variable band-pass filter more and small part is related to
Double frequency variable band-pass filter, and the report for being related to three frequency range variable band-pass filters is then few, mentioned method and structure and
The limited capacity realized.The centre frequency for not requiring nothing more than the passband of filter in practical application is controllable, also requires filter
Bandwidth be also controllable.Also, with the rapid development of mobile communication system, the demand to the miniaturization of device is also increasingly
Greatly, therefore three frequency band variable band-pass filters of Highgrade integration have biggish application prospect.
Summary of the invention
The purpose of the present invention is to solve the defect of the above-mentioned prior art, provide a kind of tool there are two can electricity adjust passband
Three band-pass filters, first and second passband of the filter be it is independent can electricity adjust, third fixed passband is controllable
, and the bandwidth of three passbands be also it is controllable, due to only with a pair of symmetrical multimode resonator, so small-sized
Change aspect to have great advantages.
The purpose of the present invention can be reached by adopting the following technical scheme that:
A kind of tool there are two can electricity adjust three band-pass filters of passband, Jie of microstrip line construction, middle layer including upper layer
Matter substrate, lower layer grounding plate and metal throuth hole, the metal throuth hole sequentially pass through microstrip line construction, medium substrate and
Grounding plate makes to connect between microstrip line construction and grounding plate by medium substrate, it is characterised in that: the microstrip line
Structure includes a pair of symmetrical multimode resonator and a pair of symmetrical input/output feed line, each multimode resonance
Device includes a split-ring resonator and a minor matters structure, and the opening of the split-ring resonator passes through one group of concatenated change
Hold diode connection, the minor matters structure is in " towel " font, and load split-ring resonator in opening opposite edge
On the outside of the heart.
As a preferred embodiment, logical among one group of the opening of the split-ring resonator concatenated varactor
It crosses a biasing resistor and connects the first DC voltage source.
As a preferred embodiment, the center minor matters line lower end of the minor matters structure increases in band by bending twice
Couple the freedom degree of control.
As a preferred embodiment, the minor matters structure in the multimode resonator on the left side be the first minor matters structure, the right it is more
Minor matters structure in mould resonator is the second minor matters structure, the right side minor matters line end of the first minor matters structure and the second minor matters
The left side minor matters line end of structure loads a varactor respectively.
As a preferred embodiment, the left side of the right side minor matters line end of the first minor matters structure and the second minor matters structure
Minor matters line end also loads a fixed capacity respectively；Wherein, the right side minor matters line end of the first minor matters structure loads
Fixed capacity is located at before the varactor of right side minor matters line end load of the first minor matters structure, the second minor matters structure
Left side minor matters line end load fixed capacity be located at the second minor matters structure left side minor matters line end load two pole of transfiguration
Before pipe.
As a preferred embodiment, the varactor and consolidate that the right side minor matters line end of the first minor matters structure loads
Determine between the varactor and fixed capacity of between the capacitor and left side minor matters line end of the second minor matters structure load respectively
The second DC voltage source is connect by a biasing resistor.
As a preferred embodiment, the split-ring resonator in the multimode resonator on the left side is the first split-ring resonator,
Split-ring resonator in the multimode resonator on the right is the second split-ring resonator, first split-ring resonator and second
Split-ring resonator with opening opposite edge center inside load a ground connection radio-frequency choke respectively.
As a preferred embodiment, the pair of symmetrical input/output feed line is respectively the first input/output
Feed line and the second input/output feed line, the first input/output feed line and the second input/output feed line wrap
Include a section termination short-circuit micro-band line and section termination open circuit microstrip line；
The first input/output feed line is located on the left of the multimode resonator on the left side, in the first input/output feed line
In, the short-circuit end of terminal short circuit microstrip line is located at the top of the first split-ring resonator, the open end position of open-end microstrip line
In the lower section of the first split-ring resonator；
The second input/output feed line is located on the right side of the multimode resonator on the right, in the second input/output feed line
In, the short-circuit end of terminal short circuit microstrip line is located at the top of the second split-ring resonator, the open end position of open-end microstrip line
In the lower section of the second split-ring resonator.
As a preferred embodiment, the left side of the first input/output feed line is equipped with the first input/output end port,
The right side of the second input/output feed line is equipped with the second input/output end port.
As a preferred embodiment, between first input/output end port and the first input/output feed line, and
A fixed capacity is respectively connected between second input/output end port and the second input/output feed line.
The present invention have compared with the existing technology it is following the utility model has the advantages that
1, present invention employs a pair of symmetrical multimode resonator, each multimode resonator includes that a split ring is humorous
Vibration device and " towel " font minor matters structure, and split-ring resonator and " towel " font minor matters structure are all loaded with two pole of transfiguration
Pipe, by this to multimode resonator realize tool there are two can independent electrical adjust passband, the centre frequency and band of three frequency bands
Wide three controllable band band-pass filters, solve and are related to restructural single-frequency bandpass filter more, are related to being applied to three display systems
Variable band-pass filter it is relatively fewer, the problem of mentioned method and structure and the limited capacity realized.
2, the tool that designs of the present invention there are two can electricity adjust three band band-pass filters of passband, due to only with a pair
Multimode resonator (two multimode resonators), has great advantages in terms of size, meets in practical application and wirelessly communicate
Requirement of the system to device miniaturization.
Detailed description of the invention
Fig. 1 is the multimode resonator structure chart of the embodiment of the present invention 1.
Fig. 2 is the odd mould equivalent circuit diagram of the multimode resonator of the embodiment of the present invention 1.
Fig. 3 is the even mould equivalent circuit diagram of the multimode resonator of the embodiment of the present invention 1.
Fig. 4 is the odd mould equivalent circuit diagram of Fig. 3 circuit.
Fig. 5 is the even mould equivalent circuit diagram of Fig. 3 circuit.
Fig. 6 is three band-pass filter structure charts of the embodiment of the present invention 2.
Fig. 7 is that second and third passband of three band-pass filters of the embodiment of the present invention 3 is fixed, the adjustable S of the first passband21It is imitative
True curve graph.
Fig. 8 is that second and third passband of three band-pass filters of the embodiment of the present invention 3 is fixed, the adjustable S of the first passband11It is imitative
True curve graph.
Fig. 9 is that three the first and third passbands of band-pass filter of the embodiment of the present invention 3 are fixed, the adjustable S of the second passband21It is imitative
True curve graph.
Figure 10 is that three the first and third passbands of band-pass filter of the embodiment of the present invention 3 are fixed, the adjustable S of the second passband11It is imitative
True curve graph.
Wherein, 1- microstrip line construction, the first split-ring resonator of 2-, 3- the first minor matters structure, 4- the second split ring resonance
Device, 5- the second minor matters structure, 6- are grounded radio-frequency choke, 7- the first input/output feed line, the second input/output of 8- feed
Line.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment 1:
As shown in Figure 1, the present embodiment proposes a kind of multimode resonator, which includes a split ring resonance
Device and a minor matters structure, a varactor C of the opening (two opening terminals) of the split-ring resonatorV1Connection
Get up, the minor matters structure is in " towel " font, and is loaded at the center of split-ring resonator, the two sides minor matters line end of minor matters structure
End loads a varactor C respectivelyV2, the multimode resonator proposed in this way forms " a hanging " font on the whole, due to
The multimode resonator is symmetrical about PP' plane, therefore can carry out mode point to it with analysis method of odd-even model
Analysis.
For the ease of analysis, it is assumed that the characteristic admittance Y of microstrip line4=4Y1=2Y2=2Y3, physical length L1+L2=L3, such as
Shown in Fig. 2 and Fig. 3, the respectively odd mould of multimode resonator and even mould equivalent circuit.From figure 2 it can be seen that multimode resonator
Odd mould equivalent circuit be equivalent to an open end and be loaded with varactor CV1Quarter-wave resonance device, resonance frequency f1
With L1+ΔL1It is inversely proportional, wherein Δ L1For varactor CV1Equivalent micro-strip line length；Therefore, resonance frequency f1It can be by varactor
CV1It is adjusted.From figure 3, it can be seen that the even mould equivalent circuit of resonator be also it is symmetrical, therefore, can be further
It is analyzed using odd-even mode analytical method, the odd mould of Fig. 3 circuit and even mould equivalent circuit distinguish as shown in Figure 4 and Figure 5, Fig. 4 institute
The equivalent circuit shown is traditional quarter-wave resonance device, resonance frequency f3With the physical length L of microstrip line3(namely L1+
L2) be inversely proportional, equivalent circuit shown in fig. 5 is that one end is loaded with varactor CV2Half-wave resonator, resonance frequency
f2With L3+L4+L5+ΔL2It is inversely proportional, wherein Δ L2For varactor CV2Equivalent micro-strip line length；Therefore, resonance frequency f3It can be with
Varactor CV2By being adjusted.
Embodiment 2:
According to " W.Tang and J.-S.Hong, " Varactor-tuned dual-mode bandpass
Filters ", IEEE Trans.Microw.Theory Tech., vol.58, no.8, pp.2213's -2219, Aug.2010. "
Analysis, if load(ing) point of the load minor matters on main transmission line be it is symmetrical about input/output end port, no matter load in minor matters
On varactor be asymmetrical loading or asymmetrical load, the design effect reached be it is the same, in order to reduce varactor
Use number, by the varactor C on the left of the minor matters structure in the multimode resonator of above-described embodiment 1V2It removes, forms branch
The asymmetrical loading of varactor in section structure.
As shown in fig. 6, three band-pass filters of the present embodiment include the medium base of the microstrip line construction 1 on upper layer, middle layer
Plate (not shown), the grounding plate (not shown) of lower layer and metal throuth hole (not shown), micro-strip knot
Structure 1 and grounding plate are all attached on medium substrate, the metal throuth hole sequentially pass through microstrip line construction 1, medium substrate and
Grounding plate makes to connect between microstrip line construction 1 and grounding plate by medium substrate, and the microstrip line construction 1 includes
A left side is presented in a pair of symmetrical multimode resonator and a pair of symmetrical input/output feed line, entire microstrip line construction 1
It is right symmetrical；
In the pair of symmetrical multimode resonator, the multimode resonator on the left side includes the first split-ring resonator 2
With the first minor matters structure 3, the multimode resonator on the right includes the second split-ring resonator 4 and the second minor matters structure 5, and described first
The opening of split-ring resonator 2 and the second split-ring resonator 4 passes through one group of (two) concatenated varactor CV1Connection,
The first minor matters structure 3 and the second minor matters structure 5 are in " towel " font, wherein the load of the first minor matters structure 3 is in the first opening
On the outside of the center with opening opposite edge of ring resonator 2, the second minor matters structure 5 is loaded the of the first split-ring resonator 2
On the outside of the center with opening opposite edge of two split-ring resonators 4, first split-ring resonator 2 and the second split ring are humorous
Vibration device 4 loads a ground connection radio-frequency choke 6 with the center inside of opening opposite edge respectively, the ground connection work of radio-frequency choke 6
For DC earthing use, and radiofrequency signal can be prevented to be shorted to the ground of DC power supply；
The concatenated varactor C of one group of the opening of first split-ring resonator 2V1It centre and first opens
The concatenated varactor C of one group of the opening of choma resonator 2V1The first DC voltage source is connect by a biasing resistor
VCC1, the first DC voltage source VCC1It can be varactor CV1Bias voltage is provided, while the biasing resistor also functions to radio frequency
The effect of chokes；
The center minor matters line lower end of the first minor matters structure 3 and the second minor matters structure 5 increases band by bending twice
The freedom degree of interior coupling control, the right side minor matters line end of the first minor matters structure 3 load a fixed capacity CDCWith a transfiguration
Diode CV2, the left side minor matters line end of the second minor matters structure 5 also loads a fixed capacity CDCWith a varactor
CV2, fixed capacity CDCPositioned at varactor CV2Before, play the role of blocking；
The varactor C of the right side minor matters line end load of the first minor matters structure 3V2With fixed capacity CDCBetween,
And second minor matters structure 5 left side minor matters line end load varactor CV2With fixed capacity CDCBetween pass through respectively
One biasing resistor meets the second DC voltage source VCC2, the second DC voltage source VCC2It can be varactor CV2Biased electrical is provided
Pressure, while the biasing resistor also functions to the effect of radio frequency choke；
The pair of symmetrical input/output feed line is respectively that the first input/output feed line 7 and second is defeated
Enter/export feed line 8, the first input/output feed line 7 and the second input/output feed line 8 include that a section termination is short
Road microstrip line and section termination open circuit microstrip line, increase the freedom degree for extracting external sort factor；
The first input/output feed line 7 is located on the left of the multimode resonator on the left side, feeds in the first input/output
In line 7, the short-circuit end of terminal short circuit microstrip line is located at 2 tops of the first split-ring resonator, the open circuit of open-end microstrip line
End is located at the lower section of the first split-ring resonator 2；The multimode resonator that the second input/output feed line 8 is located at the right is right
Side, in the second input/output feed line 8, the short-circuit end of terminal short circuit microstrip line is located at the upper of the second split-ring resonator 4
Side, the open end of open-end microstrip line are located at the lower section of the second split-ring resonator 4；
The left side of the first input/output feed line 7 is equipped with the first input/output end port Port1, and described second is defeated
The right side for entering/exporting feed line 8 is defeated equipped with the second input/output end port Port2, the first input/output end port Port1 and first
Enter/export between feed line 7 and is all connected between the second input/output end port Port2 and the second input/output feed line 8
There is a fixed capacity Cin, fixed capacity CinIt can also be used to adjust external sort factor.
First passband of three band-pass filters of the present embodiment is humorous by the equivalent quarter-wave resonance device in Fig. 3
Vibration frequency f1It is formed, with the micro-strip line length L in Fig. 61+L2+L3With varactor CV1It is related, varactor can be passed through
CV1Bias voltage (the first DC voltage source VCC1For varactor CV1Bias voltage is provided) carry out electric adjusting, it is evident that
The coefficient of coup of first passband can be by coupling length L1With coupling gap S1It is controlled；The third of three band-pass filters is logical
Band by traditional quarter-wave resonance device in Fig. 4 resonance frequency f3It is formed, with the micro-strip line length L in Fig. 61+L2+L3+
L4+L5+L6+L7It is related, not with varactor CV1And CV2Variation and change, belong to fixed passband；As can be seen that third is logical
The coefficient of coup and coupling length L of band1、L7With coupling gap S1、S2It is related, work as L1And S1After determination, namely it has been determined that first is logical
The coefficient of coup of the coefficient of coup of band, third passband can pass through L7And S2It is separately adjustable；Second passband of three band-pass filters
By the resonance frequency f of the equivalent half-wave resonator in Fig. 52It is formed, not only the physical length with microstrip lines all in Fig. 6 has
It closes, and by varactor CV2It influences, not by varactor CV1Influence；Therefore, the second passband can pass through two pole of transfiguration
Pipe CV2Bias voltage (the second DC voltage source VCC2For varactor CV2Bias voltage is provided) independent electrical adjusting is carried out, and
The coefficient of coup and coupling length L of second passband1、L7、L9With coupling gap S1、S2、S3It is related, work as L1、L7、S1And S2It determines, i.e.,
The coefficient of coup of the first passband and third passband is determined, then the coefficient of coup of the second passband can be by L9And S3It is separately adjustable.It is comprehensive
On, the centre frequency of three band-pass filters of proposition can be separately adjustable, and independent electricity may be implemented in the first and second passband
Adjust, also, to a certain extent for, three passbands are individually controllable with the interior coefficient of coup.
By analyzing above it is found that the present invention is by implementing a pair of novel multimode resonator, using suitable feed structure,
It realizes centre frequency and bandwidth is controllable, and the first and second passband can electric three band band-pass filters adjusted.Institute of the present invention
Include is that there are two the centre frequencies of passband electric can independently adjust for tool, and the design of three controllable band band-pass filters of bandwidth is former
Reason, the design structure can be micro-strip, coaxial line or other structures.
Embodiment 3:
Three band-pass filter structures are as shown in fig. 6, business electromagnetic simulation software used in the present embodiment is Agilent
The Advanced Design System (ADS) of company.Three band-pass filters select processing dielectric constant be 2.55, thickness
On the medium substrate for being 0.0029 for 0.8mm, loss angle tangent, the specific size of filter construction shown in Fig. 6 such as the following table 1 institute
Show；Fixed capacity uses the product of Murata, varactor C in the present embodimentV2The fixed capacity C of frontDCIt plays
The effect of blocking, CDC=7pF, and the fixed capacity C of input/output end portin=2.2pF.CV1Select Skyworks company
The varactor of SMV1405-074 model, CV2Select two pole of transfiguration of the SMV1405-079LF model of Skyworks company
Pipe.
1 three band band-pass filter size of table
If Fig. 7~Figure 10 is respectively the simulation curve of three band-pass filters.Fig. 7 and shown in Fig. 8, respectively second,
Three passbands are fixed, the adjustable S of the first passband21(S21Positive transmission coefficient of the expression input port to output port) and S11(|S11|
Indicate the return loss of input port) simulation curve, it can be seen that the centre frequency of the second passband and third passband is fixed respectively
At 2.65GHz and 3.5GHz, the centre frequency of the first passband can be adjusted by 1.25GHz to 1.73GHz, opposite adjustable extent
It is 32.2%, insertion loss 1.39-1.97dB, return loss is greater than 15dB；In adjustment process, the 3dB of the first passband is absolute
Bandwidth is 135 ± 18MHz；Fig. 9 and shown in Fig. 10, respectively the first and third passband is fixed, the adjustable S of the second passband21And S11
Simulation curve, it can be seen that first and the centre frequency of third passband be separately fixed at 1.58GHz and 3.5GHz, second is logical
The centre frequency of band can be adjusted by 2.41GHz to 2.72GHz, and relative adjustment range is 12.1%, insertion loss 2.13dB-
2.93dB, return loss are greater than 15dB；In adjustment process, the 3dB absolute bandwidth of the second passband is 129 ± 10MHz, third passband
3dB absolute bandwidth be 150MHz, filter overall performance goes out preferable performance.
In conclusion the present invention it is innovative propose tool there are two can electricity adjust three band band-pass filters of passband, fill out
A part of blank for having mended current reconfigurable filter technical research, improves the integrated level of system, which not only has
Two can electricity adjust passband, the centre frequency of its three frequency bands be all it is individually controllable, and bandwidth be also it is controllable, more
Have flexibility, can preferably meet the application of the existing restructural wireless communication system of three frequency ranges.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (9)
1. a kind of tool there are two can electricity adjust passband three band-pass filters, the medium of microstrip line construction, middle layer including upper layer
Substrate, lower layer grounding plate and metal throuth hole, the metal throuth hole sequentially passes through microstrip line construction, medium substrate and connects
Ground metal plate makes to connect between microstrip line construction and grounding plate by medium substrate, it is characterised in that: the micro-strip knot
Structure includes a pair of symmetrical multimode resonator and a pair of symmetrical input/output feed line, each multimode resonator
Including a split-ring resonator and a minor matters structure, the opening of the split-ring resonator passes through one group of concatenated transfiguration
Diode connection, the concatenated varactor centre of the group connect the first DC voltage source by a biasing resistor；The minor matters
Structure is in " towel " font, and is loaded on the outside of the center with opening opposite edge of split-ring resonator.
2. a kind of tool according to claim 1 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
The center minor matters line lower end of minor matters structure is stated by bending twice.
3. a kind of tool according to claim 1 there are two can electricity adjust three band-pass filters of passband, it is characterised in that: it is left
Minor matters structure in the multimode resonator on side is the first minor matters structure, and the minor matters structure in the multimode resonator on the right is second
Section structure, the right side minor matters line end of the first minor matters structure and the left side minor matters line end of the second minor matters structure load respectively
One varactor.
4. a kind of tool according to claim 3 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
The left side minor matters line end of the right side minor matters line end and the second minor matters structure of stating the first minor matters structure also loads one admittedly respectively
Determine capacitor；Wherein, the fixed capacity of the right side minor matters line end load of the first minor matters structure is located at the first minor matters structure
Before the varactor of right side minor matters line end load, the fixation of the left side minor matters line end load of the second minor matters structure
Capacitor is located at before the varactor of left side minor matters line end load of the second minor matters structure.
5. a kind of tool according to claim 4 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
State the first minor matters structure right side minor matters line end load varactor and fixed capacity between and the second minor matters structure
Left side minor matters line end load varactor and fixed capacity between the second direct current is connect by a biasing resistor respectively
Voltage source.
6. a kind of tool according to claim 1 there are two can electricity adjust three band-pass filters of passband, it is characterised in that: it is left
Split-ring resonator in the multimode resonator on side is the first split-ring resonator, and the split ring in the multimode resonator on the right is humorous
Vibration device is the second split-ring resonator, first split-ring resonator and the second split-ring resonator with opening opposite edge
Center inside load a ground connection radio-frequency choke respectively.
7. a kind of tool according to claim 6 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
Stating a pair of symmetrical input/output feed line is respectively the first input/output feed line and the second input/output feed
Line, the first input/output feed line and the second input/output feed line include a section termination short-circuit micro-band line and one section
Open-end microstrip line；
The first input/output feed line is located on the left of the multimode resonator on the left side, in the first input/output feed line,
The short-circuit end of terminal short circuit microstrip line is located at the top of the first split-ring resonator, and the open end of open-end microstrip line is located at the
The lower section of one split-ring resonator；
The second input/output feed line is located on the right side of the multimode resonator on the right, in the second input/output feed line,
The short-circuit end of terminal short circuit microstrip line is located at the top of the second split-ring resonator, and the open end of open-end microstrip line is located at the
The lower section of two split-ring resonators.
8. a kind of tool according to claim 7 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
The left side for stating the first input/output feed line is equipped with the first input/output end port, the right side of the second input/output feed line
Side is equipped with the second input/output end port.
9. a kind of tool according to claim 8 there are two can electricity adjust passband three band-pass filters, it is characterised in that: institute
State between the first input/output end port and the first input/output feed line and the second input/output end port and second input/
A fixed capacity is respectively connected between output feed line.
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| CN108574130B (en) * | 2017-03-13 | 2019-08-02 | 电子科技大学 | Micro-strip filter circuit, micro-strip duplexer and related electronic devices |
| CN107086340B (en) * | 2017-04-18 | 2019-03-19 | 电子科技大学 | A kind of tri-band bandpass filter with highly selective pass band tunable |
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| CN114759323B (en) * | 2021-11-12 | 2022-09-09 | 电子科技大学 | Phase shifter integrating reconfigurable filtering and amplitude control |
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