CN106207335A - A kind of adjustable reconfigurable band filter - Google Patents
A kind of adjustable reconfigurable band filter Download PDFInfo
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- CN106207335A CN106207335A CN201610716050.9A CN201610716050A CN106207335A CN 106207335 A CN106207335 A CN 106207335A CN 201610716050 A CN201610716050 A CN 201610716050A CN 106207335 A CN106207335 A CN 106207335A
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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
Abstract
The invention provides a kind of adjustable reconfigurable band filter, including substrate, and the first resonant element, the second resonant element, the 3rd resonant element, the 4th resonant element, input and outfan on the substrate is set；Described first resonant element, described second resonant element, described 3rd resonant element is identical with the resonant frequency of described 4th resonant element and is of coupled connections successively, described input is of coupled connections with described first resonant element, and described outfan is of coupled connections with described 4th resonant element；One end of described first resonant element, described second resonant element, described 3rd resonant element and described 4th resonant element is respectively arranged with a transfiguration circuit；The other end of described second resonant element and described 3rd resonant element is respectively arranged with an on-off circuit.The band filter of the present invention can realize that resonance passband is adjustable and restructural characteristic, simple to operate, easy to use.
Description
Technical field
The present invention relates to technical field of micro communication, more particularly, it relates to a kind of adjustable reconfigurable band filter.
Background technology
Along with developing rapidly of modern wireless communication systems, the contradiction of spectrum congestion.In order to improve frequency spectrum money
The availability in source, many passbands, expand the spectrum technology such as frequency hopping and dynamic frequency allocation be used widely, this is greatly facilitated soon
Speed electricity is adjusted or the development of electricity reconfigurable filter.Meanwhile, the developing rapidly radio-based electronic devices of modern wireless communication technique
Multi-functional, miniaturization proposes the highest design requirement.
But the filter combination that traditional fixed filters typically requires multiple different frequency range makes for realizing frequency range
Adjustable.But the volume that this mode not only makes RF transceiver doubles, and adding its power consumption and cost, this does not meets
Present receiving machine RF front-end circuit miniaturization, the main trend of low cost.Meanwhile, when making wave filter in this way,
When need not use some frequency range, complex operation, it is impossible to be adjusted at once.
Summary of the invention
The technical problem to be solved in the present invention is, for deficiency of the prior art, it is provided that a kind of adjustable reconfigurable
Band filter.
The present invention solves the technical scheme of the problems referred to above and there is provided a kind of adjustable reconfigurable band filter, including:
Substrate, and arrange the first resonant element on the substrate, the second resonant element, the 3rd resonant element, the
Four resonant elements, input and outfan；
Described first resonant element and the described 3rd symmetrical setting of resonant element, described second resonant element and institute
State the 4th symmetrical setting of resonant element, described first resonant element, described second resonant element, described 3rd resonance list
The resonant frequency of first and described 4th resonant element is identical and is of coupled connections successively, described input and described first resonant element
Being of coupled connections, described outfan is of coupled connections with described 4th resonant element；
Described first resonant element, described second resonant element, described 3rd resonant element and described 4th resonant element
One end be respectively arranged with a transfiguration circuit, described transfiguration circuit changes described first humorous according to the different bias voltage of input
Shake unit, described second resonant element, described 3rd resonant element and the resonant frequency of described 4th resonant element, and then change
The mid frequency of described band filter；
The other end of described second resonant element and described 3rd resonant element is respectively arranged with an on-off circuit, described in open
Close the two ends of circuit respectively with described second resonant element or the other end of described 3rd resonant element and with reference to be connected, institute
State on-off circuit and control the resonant frequency of described second resonant element and described 3rd resonant element and described first resonant element
Identical or different with the resonant frequency of the 4th resonant element, so that described first resonant element, described second resonant element, institute
State the 3rd resonant element and described 4th resonant element coupling forms a resonance passband or coupling cannot form a resonance passband,
And then realize reconfigurable resonance passband.
Wherein, described transfiguration circuit include varactor, electric capacity, the first resistance, connect terminal, voltage input-terminal and
First ground terminal, wherein, one end of described electric capacity be connected to described first resonant element or described second resonant element or
3rd resonant element described in person or one end of described 4th resonant element, the other end of described electric capacity, described varactor
One end and one end of described first resistance be connected to described connection terminal, the other end of described first resistance is connected to described
Voltage input-terminal, the other end of described varactor is connected to described first ground terminal；At described voltage input-terminal
During external different bias voltage, described varactor obtains different capacitances, and then changes described first resonant element
Or described second resonant element or described 3rd resonant element or the resonant frequency of described 4th resonant element.
Wherein, described band filter also includes that one first ground plane, described first ground plane are arranged on the substrate
And flush with the lateral edges of described substrate, described first ground terminal is connected on described first ground plane.
Wherein, described on-off circuit includes mems switch, the second resistance and the second ground terminal, the of described mems switch
One terminal is connected with the other end of described second resonant element or described 3rd resonant element, the second terminal is through described second
Resistance is connected to described second ground terminal, controls the external direct current signal of end.
Wherein, described band filter also includes that one second ground plane, described second ground plane are arranged on the substrate
And flush with the lateral edges of described substrate, described second ground terminal is connected on described second ground plane.
Wherein, described first resonant element, described second resonant element, described 3rd resonant element and described 4th resonance
Unit is spiral resonator
Wherein, described spiral resonator is formed by half-wavelength uniform impedance microstrip line spiral.
Wherein, described input is provided with an input limit coupling line, and described outfan is provided with an output limit coupling line, institute
State input limit coupling line and the symmetrical setting of coupling line of described output limit, described first limit coupling line and described first resonance
Unit is of coupled connections, and described second limit coupling line is of coupled connections with described 4th resonant element.
Wherein, described substrate is high-temperature superconductor medium substrate.
The invention have the benefit that the adjustable reconfigurable band filter of the present invention is by all of resonant element
One end transfiguration circuit is set to realize the change of the resonant frequency of resonant element, and then realize the adjustable spy of band filter
Property, and only regulable center frequency, in use, the bias voltage that can input this different transfiguration circuit can change passband filtering
The mid frequency of device, simple in construction and miniaturization.Meanwhile, switch electricity is set by the other end of some resonant elements wherein
Road so that the resonant frequency of all resonant elements is different or identical, and then off resonance or resonance between all resonant elements, from
And realize restructural characteristic, in use, Guan Bi or disconnection on-off circuit can make the electromagnetic signal of corresponding mid frequency
Pass through, simple to operate, and in use, it is not necessary to or can be adjusted at once when needing to use some frequency range.
Additionally, use this adjustable reconfigurable band filter of high-temperature superconductor Jie's substrate manufacture, it is lost little.
Accompanying drawing explanation
Fig. 1 is the structural representation of the adjustable reconfigurable band filter of the embodiment of the present invention.
Fig. 2 is that on-off circuit changes the different reflection coefficient that varactor bias voltage obtains when being in closure state
Curve chart.
Fig. 3 is that on-off circuit changes the different transmission coefficient that varactor bias voltage obtains when being in closure state
Curve chart.
Fig. 4 is mems switch Guan Bi and the scattering parameter curve chart under disconnection.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
As it is shown in figure 1, the structural representation of the adjustable reconfigurable band filter of the embodiment of the present invention, adjustable restructural
The symmetrical setting of band filter, including substrate 100, and arrange the first resonant element 1 on the substrate 100, the
Two resonant element the 2, the 3rd resonant element the 3, the 4th resonant elements 4, input 5 and outfan 6.First resonance list the 1, second resonance
One end of unit the 2, the 3rd resonant element 3 and the 4th resonant element 4 is respectively arranged with a transfiguration circuit 7；Second resonant element 2 He
The other end of the 3rd resonant element 3 is respectively arranged with an on-off circuit 8.
First resonant element 1 and the 3rd symmetrical setting of resonant element 3, the second resonant element 2 and the 4th resonance list
Unit's 4 symmetrical settings, first resonant element the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4
Resonant frequency is identical and is of coupled connections successively, and input 5 is of coupled connections with the first resonant element 4, outfan 3 and the 4th resonance list
Unit 4 is of coupled connections.In the present embodiment, the first resonant element 1 and the second resonant element 2, the second resonant element 2 and the 3rd resonance
Unit 3, and the 3rd resonant element 3 all uses the mode of slot-coupled to be of coupled connections with the 4th resonant element 4, wherein,
Its coupling gap is respectively labeled as d12, d23, d34.Input 5 and the first resonant element and outfan 6 and the 4th resonance list
Unit 4 the most all uses the mode of slot-coupled to be of coupled connections, and its coupling gap is respectively labeled as din and dout.Input 5 is presented
Entering electromagnetic signal, outfan 6 feeds out electromagnetic signal, now, by coupling gap d12, d23 and d34 by the first resonant element 1,
Second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4 carry out resonance, to form a resonance passband.
With reference to Fig. 1, transfiguration circuit 7 changes first resonant element the 1, second resonance list according to the different bias voltage of input
Unit's the 2, the 3rd resonant element 3 and resonant frequency of the 4th resonant element 4, and then change the mid frequency of band filter.At this
In embodiment, by different bias voltages, transfiguration circuit 7 exports different capacitances, different capacitances and the first resonance
Unit 1 or the second resonant element 2 or the 3rd resonant element 3 or the 4th resonant element 4 one work and carry out resonance, quite
In changing the first resonant element 1 or the second resonant element 2 or the 3rd resonant element 3 or resonance of the 4th resonant element 4
Frequency, and then change the mid frequency of band filter, i.e. achieve the characteristic of regulable center frequency.Bias voltage when input
During for a certain numerical value, the resonance frequency of first resonant element the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4
Rate one changes, and the size of change is identical, now, by coupling gap d12, d23 and d34 by the first resonant element 1, second
Resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4 carry out resonance, and the mid frequency of band filter becomes the most therewith
Change.As shown in Figures 2 and 3, when the bias voltage of input is respectively 2V, 8V, 16V and 30V, the mid frequency of band filter
Change, it can be seen that bias voltage is the biggest, and the mid frequency of band filter is the biggest, i.e. bias voltage is the biggest, is equivalent to first
The equivalent electric length of resonant element 1 or the second resonant element 2 or the 3rd resonant element 3 or the 4th resonant element 4 is the shortest,
It should be noted that Fig. 2 and Fig. 3 is when on-off circuit 8 is in closure state.
With reference to Fig. 1, the two ends of on-off circuit 8 respectively with the second resonant element 2 or the other end of the 3rd resonant element 3 and
Connecting with reference to ground, on-off circuit 8 controls resonant frequency and first resonant element 1 of the second resonant element 2 and the 3rd resonant element 3
It is identical or different with the resonant frequency of the 4th resonant element 4, so that first resonant element the 1, second resonant element the 2, the 3rd is humorous
Shake the unit 3 and coupling of the 4th resonant element 4 forms a resonance passband or coupling cannot form a resonance passband, and then realize can
The resonance passband of reconstruct.In the present embodiment, when on-off circuit 8 is in closure state, the second resonant element 2 and the 3rd resonance
Unit 3 connects with reference to ground, and now, the second resonant element 2 and the 3rd resonant element 3 are equivalent to quarter-wave resonance, and the
One resonant element 1 and the 4th resonant element 4 are not connected with, with reference to ground, being equivalent to half-wavelength resonance, and then the second resonant element 2 and the
The resonant frequency of three resonant elements 3 is different, by 1/4th from the resonant frequency of the first resonant element 1 and the 4th resonant element 4
Wave resonance understands with half-wavelength resonance, and both resonant frequency differences are relatively big, i.e. 1/4th wavelength, and then the first resonance
Off resonance, the electricity of input 5 feed-in is caused between unit the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4
Magnetic signal is difficult to couple between the second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4, and then cannot be formed humorous
Shake passband, is equivalent to this band filter and electromagnetic signal cannot be made to pass through, be i.e. in off position.At on-off circuit 6
When off-state, the second resonant element 2 and the 3rd resonant element 3 are not connected with reference to ground, now, and the second resonant element 2 and the
Three resonant elements 3 are equivalent to half-wavelength resonance, identical with the first resonant element 1 and the 4th resonant element 4, and then the second resonance list
Unit 2 is identical with the resonant frequency of the first resonant element 1 and the 4th resonant element 4 with the resonant frequency of the 3rd resonant element 3, and then
Between first resonant element the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4 by coupling gap d12,
D23 and d34, carries out coupled resonance, to form a resonance passband.It can be seen that when band filter works, by controlling
On-off circuit 8 i.e. may control whether to form resonance passband, to carry out whether electromagnetic signal is passed through, applies in radio-frequency (RF) receiving and transmission module
Time, easy to operate.
Further, in the present embodiment, first resonant element the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th
Resonant element 4 is spiral resonator, decreases band filter overall dimensions, it is achieved small size performance.This screw type is humorous
The device that shakes is formed by half-wavelength uniform impedance microstrip line spiral, and in the present embodiment, this spiral resonator uses and screws in rotary-out type,
The i.e. two ends of this spiral resonator are threaded in outside it respectively, it should be noted that in other embodiments, and this screw type
Resonator also can be formed by half-wavelength non-homogeneous impedance micro-strip spiral, such as, half-wavelength Stepped Impedance microstrip line, should in design
During band filter, its mid frequency is mainly determined by the electrical length of half-wavelength uniform impedance microstrip line.Further, this
Time, transfiguration circuit 7 output different capacitances work with this spiral resonator one carry out resonance time, different electric capacity
Value is equivalent to change the equivalent electric length of this spiral resonator, and different equivalent electric length, its resonant frequency is different, and then
Change the resonant frequency of this spiral resonator.Meanwhile, when transfiguration circuit 7 exports a certain capacitance, now, on-off circuit 8
When being in closure state, the spiral resonator that the second resonant element 2 and the 3rd resonant element 3 use is equivalent to quarter-wave
Long resonator, and the spiral resonator that the first resonant element 1 and the 4th resonant element 4 use is equivalent to half-wave resonator.
Further, with reference to Fig. 1, input 5 is provided with an input limit coupling line 11, and outfan 6 is provided with an output limit
Coupling line 12, input limit coupling line 11 and the output limit symmetrical setting of coupling line 12, the first limit coupling line 11 is humorous with first
The unit 1 that shakes is of coupled connections, and the second limit coupling line 12 is of coupled connections with the 4th resonant element 4.In the present embodiment, the first limit coupling
Line 11 and the first resonant element 1 and the second limit coupling line 12 and the 4th resonant element 4 use the mode of slot-coupled to carry out coupling
Closing and connect, its coupling gap is also respectively labeled as din and dout.Increased by the first limit coupling line 11 and the second limit coupling line 12
Stiffness of coupling between input 5 and the first resonant element 1, and coupling between outfan 6 with the 4th resonant element 4 is strong
Degree.
Further, in the present embodiment, with reference to Fig. 1, transfiguration circuit 7 includes varactor 71, electric capacity the 72, first electricity
Resistance 73, connection terminal 74, voltage input-terminal 75 and the first ground terminal 76, wherein, it is humorous that one end of electric capacity 72 is connected to first
Shake unit 1 or second resonant element 2 or the 3rd resonant element 3 or one end of the 4th resonant element 4, another of electric capacity 72
One end of end, one end of varactor 71 and the first resistance 73 is connected to connect terminal 74, the other end of the first resistance 73
Being connected to voltage input-terminal 75, the other end of varactor 71 is connected to the first earth terminal 76；At voltage input-terminal 75
During external different bias voltage, varactor 71 obtains different capacitances, and then changes the first resonant element 1 or the
Two resonant element 2 or the 3rd resonant element 3 or the resonant frequencies of the 4th resonant element 4.
Further, band filter also include one first ground plane 9, the first ground plane 9 arrange on the substrate 100 and with
The lateral edges of substrate 100 flushes, and the first ground terminal 76 is connected on the first ground plane 9.It should be noted that in order to this band leads to
The topological structure of wave filter is simple, and succinctly, the first ground plane 9 is arranged on the transfiguration electric capacity 7 side relative to substrate 100.?
In other embodiments, the first ground terminal 76 can be connected to reference to ground by hole knockout, now, needs to inject metal material in hole
Material, such as silver, copper etc..
Further, in the present embodiment, with reference to Fig. 1, on-off circuit 8 includes mems switch the 81, second resistance 82 and the
Two ground terminals 83, the first terminal of mems switch 81 and the other end of the second resonant element 2 or the 3rd resonant element 3 are even
Connect, the second terminal is connected to the second ground terminal 83 through the second resistance 82, controls the external direct current signal of end 84, i.e. controls end 84
External DC voltage.When transfiguration circuit 7 exports a certain capacitance, mems switch 81 closes, and on-off circuit 8 is in closed form
State, now, the electromagnetic signal of input 5 feed-in is between the second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4
It is difficult to couple, and then resonance passband cannot be formed, as shown in Figure 4.When mems switch 81 disconnects, on-off circuit 8 is in disconnection shape
State, now, by coupling between first resonant element the 1, second resonant element the 2, the 3rd resonant element 3 and the 4th resonant element 4
Gap d12, d23 and d34, carry out coupled resonance, to form a resonance passband, as shown in Figure 4.
Further, band filter also include one second ground plane 10, the second ground plane 10 arrange on the substrate 100 and
Flushing with the lateral edges of substrate 100, the second ground terminal 83 is connected on the second ground plane 10.It should be noted that for this
The topological structure of band filter is simple, and succinctly, the second ground plane 10 is arranged on on-off circuit 8 relative to the one of substrate 100
Side.In other embodiments, the second ground terminal 83 can be connected to reference to ground by hole knockout, now, needs to inject in hole
Metal material, such as silver, copper etc..
Further, with reference to Fig. 1, in the present embodiment, substrate 1 is high-temperature superconductor medium substrate, and its dielectric constant is
9.78, thickness is 0.5mm, and this high-temperature superconductor medium substrate is made up of magnesium oxide, the upper and lower surface of this high-temperature superconductor medium substrate
Being made up of yttrium barium copper oxide superconducting film, in the present embodiment, the yttrium barium copper oxide at the upper surface of this high-temperature superconductor medium substrate surpasses
Lead thin film and etch first resonant element the 1, second resonant element the 2, the 3rd resonant element the 3, the 4th resonant element by photoetching process
4, input 5, outfan the 6, first earthed surface the 9, second earthed surface the 10, first limit coupling line the 11, second limit coupling line 12,
In above-mentioned transfiguration circuit 7 connect in terminal 74, voltage input-terminal 75 and the first ground terminal 76 and on-off circuit 8 the
Two ground terminals 83.Due to high-temperature superconductor medium substrate, the loss of this band filter is little.
Summary, the adjustable reconfigurable band filter of the present invention is by arranging transfiguration in one end of all of resonant element
Circuit realizes the change of the resonant frequency of resonant element, and then realizes the tunable characteristic of band filter, and only mid frequency
Adjustable, in use, the bias voltage that can input this different transfiguration circuit can change the mid frequency of pass filter, knot
Structure is simple and miniaturization.Meanwhile, on-off circuit is set by the other end of some resonant elements wherein so that all resonance lists
The resonant frequency of unit is different or identical, and then off resonance or resonance between all resonant elements, thus realizes restructural characteristic,
In use, Guan Bi or disconnection on-off circuit can make the electromagnetic signal of corresponding mid frequency pass through, simple to operate, and
During use, it is not necessary to or can be adjusted at once when needing to use some frequency range.
Above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all answer
Contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (9)
1. an adjustable reconfigurable band filter, it is characterised in that including:
Substrate, and the first resonant element on the substrate, the second resonant element, the 3rd resonant element, the 4th humorous is set
Shake unit, input and outfan；
Described first resonant element and the described 3rd symmetrical setting of resonant element, described second resonant element and described the
The four symmetrical settings of resonant element, described first resonant element, described second resonant element, described 3rd resonant element and
The resonant frequency of described 4th resonant element is identical and is of coupled connections successively, and described input couples with described first resonant element
Connecting, described outfan is of coupled connections with described 4th resonant element；
Described first resonant element, described second resonant element, described 3rd resonant element and the one of described 4th resonant element
End is respectively arranged with a transfiguration circuit, and described transfiguration circuit changes described first resonance list according to the different bias voltage of input
Second resonant element first, described, described 3rd resonant element and the resonant frequency of described 4th resonant element, and then change described
The mid frequency of band filter；
The other end of described second resonant element and described 3rd resonant element is respectively arranged with an on-off circuit, described switch electricity
The two ends on road respectively with described second resonant element or the other end of described 3rd resonant element and with reference to be connected, described in open
Close circuit and control the resonant frequency of described second resonant element and described 3rd resonant element and described first resonant element and the
The resonant frequency of four resonant elements is identical or different so that described first resonant element, described second resonant element, described
Three resonant elements and described 4th resonant element coupling formation one resonance passband or coupling cannot form a resonance passband, and then
Realize reconfigurable resonance passband.
2. according to the band filter described in claim 1, it is characterised in that described transfiguration circuit include varactor,
Electric capacity, the first resistance, connection terminal, voltage input-terminal and the first ground terminal, wherein, one end of described electric capacity is connected to institute
State the first resonant element or described second resonant element or described 3rd resonant element or described 4th resonant element
One end, one end of the other end of described electric capacity, one end of described varactor and described first resistance is connected to described company
Connecting terminal, the other end of described first resistance is connected to described voltage input-terminal, and the other end of described varactor connects
In described first ground terminal；When the external different bias voltage of described voltage input-terminal, described varactor obtains
Different capacitances, and then change described first resonant element or described second resonant element or described 3rd resonance list
First or the resonant frequency of described 4th resonant element.
3. according to the band filter described in claim 2, it is characterised in that described band filter also includes that one first connects
Ground, described first ground plane arranges on the substrate and flushes with the lateral edges of described substrate, described first ground terminal
It is connected on described first ground plane.
4. according to the band filter described in claim 1, it is characterised in that described on-off circuit include mems switch,
Two resistance and the second ground terminal, the first terminal of described mems switch and described second resonant element or described 3rd resonance
The other end of unit connects, the second terminal is connected to described second ground terminal through described second resistance, to control end external directly
Stream signal.
5. according to the band filter described in claim 4, it is characterised in that described band filter also includes that one second connects
Ground, described second ground plane arranges on the substrate and flushes with the lateral edges of described substrate, described second ground terminal
It is connected on described second ground plane.
6. according to the band filter described in claim 1, it is characterised in that described first resonant element, described second humorous
Shake unit, described 3rd resonant element and described 4th resonant element is spiral resonator.
7. according to the band filter described in claim 6, it is characterised in that described spiral resonator is uniform by half-wavelength
Impedance micro-strip spiral forms.
8. according to the band filter described in claim 1, it is characterised in that described input is provided with an input limit coupling
Line, described outfan is provided with an output limit coupling line, and described input limit coupling line is that left and right is right with described output limit coupling line
Claiming to arrange, described first limit coupling line is of coupled connections with described first resonant element, described second limit coupling line and the described 4th
Resonant element is of coupled connections.
9. according to the band filter described in claim 1, it is characterised in that described substrate is high-temperature superconductor medium substrate.
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| CN110783671A (en) * | 2019-11-13 | 2020-02-11 | 电子科技大学 | Reconfigurable band-pass filter |
| CN116454574A (en) * | 2023-06-20 | 2023-07-18 | 无锡频岢微电子有限公司 | Reconfigurable band-stop filter |
| CN116454574B (en) * | 2023-06-20 | 2023-09-12 | 无锡频岢微电子有限公司 | Reconfigurable band-stop filter |
| CN117477195A (en) * | 2023-12-27 | 2024-01-30 | 成都宏科电子科技有限公司 | Broadband parallel coupling filter for inhibiting 2-frequency multiplication harmonic wave |
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Effective date of registration: 20190822 Address after: 710048 Xianning West Road, Shaanxi, China, No. 28, No. Patentee after: Xi'an Jiaotong University Address before: 330013 Changbei Economic and Technological Development Zone, Nanchang City, Jiangxi Province, 808 Shuanggang Moving East Street Patentee before: East-China Communication Univ |