CN106788313A - A kind of feed circuit of wave filter and the device based on the feed circuit - Google Patents
A kind of feed circuit of wave filter and the device based on the feed circuit Download PDFInfo
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- CN106788313A CN106788313A CN201710109140.6A CN201710109140A CN106788313A CN 106788313 A CN106788313 A CN 106788313A CN 201710109140 A CN201710109140 A CN 201710109140A CN 106788313 A CN106788313 A CN 106788313A
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- Prior art keywords
- transmission line
- feed circuit
- wave filter
- switch
- input
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/52—One-way transmission networks, i.e. unilines
Abstract
The embodiment of the invention provides the feed circuit and the device based on the feed circuit of a kind of wave filter, the feed circuit includes input port, one end is connected with input port, first transmission line of other end ground connection, one end is connected with the first transmission line, second transmission line and electric capacity of other end ground connection, and the first transmission line and/or the second transmission line are connected with electric capacity, it is used to by capacitance connection resonator, and for resonator is powered.The metal wire that feed circuit provided in an embodiment of the present invention is grounded by the use of end is used as transmission line, while realizing transferring signals to resonator, low frequency signal has been transferred on the ground by ground connection also, i.e. equivalent to introducing grounded inductor in feed circuit, so that the wave filter comprising the feed circuit can produce transmission zero in passband low side, the rectangular degree of wave filter low side and the Out-of-band rejection ability of low side are effectively increased.
Description
Technical field
The present invention relates to frequency microwave communication and Radar Technology field, more particularly to a kind of wave filter feed circuit and base
In the device of the feed circuit.
Background technology
Wave filter can be effectively filtered out to the frequency beyond the frequency of CF or the frequency, obtain a spy
Determine the signal of frequency, or eliminate the signal after a CF, outside its effect for primarily serving FREQUENCY CONTROL, i.e. rejection band
Noise, eliminate garbage signal reducing the interference that garbage signal is produced to useful signal.
With the fast development of the communication technology, the application of various microwave/radio-frequency devices is more and more extensive, in microwave system letter
In the transmitting procedure of breath, wave filter as the device for producing by suppressing set specific frequency signal high-quality signal of communication, its
Characteristic has large effect, and the feed circuit of wave filter to overall microwave system as the part of wave filter, to filtering
The influence of device performance is very important.
The content of the invention
A kind of feed circuit The embodiment provides wave filter and the device based on the feed circuit, the feed
Circuit effectively increases the rejection ability to filter passband low side while resonator is transmitted energy to, and employs this
The high-pass type bandpass filter of feed circuit improves the Out-of-band rejection ability to low side, and then based on the high-pass type bandpass filtering
The switch filtering device assembly and switch integrated signal preselector of device also correspondingly improve the rectangular degree of low side.
To reach above-mentioned purpose, a kind of feed circuit of wave filter of embodiments of the invention, including input port, one end
It is connected with input port, the first transmission line of other end ground connection, one end is connected with the first transmission line, the second biography of other end ground connection
Defeated line and electric capacity, the first transmission line and/or the second transmission line are connected with electric capacity, are used to by capacitance connection resonator, and
For resonator is powered.
Alternatively, the first above-mentioned transmission line is grounded by the first via, and the second transmission line is grounded by the second via.
Alternatively, the first transmission line and/or the second transmission line are shaped as spirality.
Alternatively, one end of the connection input port of the first transmission line is connected after bending up or down with the first via
Connect.
Alternatively, it is connected with the first via after one end of the ground connection of the first transmission line bends up or down.
Alternatively, the second transmission line has bending between one end of the first transmission line of connection and earth terminal.
The embodiment of the present invention additionally provides a kind of high-pass type bandpass filter based on above-mentioned feed circuit, the wave filter bag
Feed circuit described above and at least two resonators are included, feed circuit is connected with resonator, for being powered for resonator,
Resonator is used to filter.
The embodiment of the present invention additionally provides a kind of switch filtering device assembly, including by least two above-mentioned high-pass type band logicals
Wave filter group into wave filter group, input radio frequency interface, export radio frequency interface, input radio frequency switch, export RF switch, and
Switch control module；The input of input radio frequency switch is connected with the output end of input radio frequency interface, and it is defeated that input radio frequency is switched
Go out end to be connected with wave filter group, export one end connection wave filter group of RF switch, other end connection output radio frequency interface.Switch
Control module is switched with input radio frequency and output RF switch is connected, for switching switch to select the frequency range of filtering.
The embodiment of the present invention additionally provides a kind of switch integrated signal preselector, including by least two above-mentioned high-pass types
The wave filter group of bandpass filter composition, input, output end, low noise amplifier module, at least two attenuators composition
Attenuator group and control module；One end of low noise amplifier module is connected with input, and the other end is connected with attenuator group；
One end of attenuator group is connected with low noise amplifier module, and the other end is connected with wave filter group, for selecting decay path；Filter
One end of ripple device group is connected with attenuator group, and the other end is connected with output end, the frequency range for selecting filtering；Control module with it is low
Noise amplifier module, attenuator group, wave filter group is connected, for being controlled to filtered switch.
Alternatively, low noise amplifier module includes through path and low noise amplification path, through path and low noise
Amplify path selects two switch to be selected by one one.
To sum up, feed circuit provided in an embodiment of the present invention is being realized passing signal using the metal wire of end ground connection
It is defeated to resonator while, also by a part of signal transmission arrived on the ground, i.e., equivalent to introduced in feed circuit ground connection electricity
Sense, so that the wave filter comprising the feed circuit can produce transmission zero in passband low side, it is also possible to so that bag
Switch filtering device assembly and switch integrated signal preselector containing the wave filter produce transmission zero in low side, so as to effectively carry
The rectangular degree and Out-of-band rejection ability of the device of the above-mentioned feed circuit provided based on the embodiment of the present application high.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be in embodiment or description of the prior art
The required accompanying drawing for using is briefly described, it should be apparent that, drawings in the following description are only some realities of the invention
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the circuit diagram of feed circuit provided in an embodiment of the present invention；
Fig. 2A is one of plane structure chart of feed circuit provided in an embodiment of the present invention；
Fig. 2 B are the three-dimensional structure diagram of feed circuit corresponding with Fig. 1 provided in an embodiment of the present invention；
Fig. 3 A are one of plane structure chart of feed circuit provided in an embodiment of the present invention；
Fig. 3 B are the three-dimensional structure diagram of feed circuit corresponding with Fig. 1 provided in an embodiment of the present invention；
Fig. 4 A are one of plane structure chart of feed circuit provided in an embodiment of the present invention；
Fig. 4 B are the three-dimensional structure diagram of feed circuit corresponding with Fig. 1 provided in an embodiment of the present invention；
Fig. 5 A are one of plane structure chart of feed circuit provided in an embodiment of the present invention；
Fig. 5 B are the three-dimensional structure diagram of feed circuit corresponding with Fig. 1 provided in an embodiment of the present invention；
Fig. 6 is a kind of circuit diagram of wave filter provided in an embodiment of the present invention；
Fig. 7 A are a kind of plane structure chart of wave filter provided in an embodiment of the present invention；
Fig. 7 B are a kind of three-dimensional structure diagram of wave filter provided in an embodiment of the present invention；
Fig. 8 is a kind of structural representation of switch filtering device assembly provided in an embodiment of the present invention；
Fig. 9 is a kind of structural representation for switching integrated signal preselector provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Signal is generally fed directly into resonator by current wave filter feed circuit in the form of tap line, using this
The wave filter of structure often has rectangular degree low, the defect such as Out-of-band rejection effect difference.In order to improve the rectangular degree of wave filter, this Shen
A kind of feed circuit of wave filter please be provide, its circuit diagram is shown in Fig. 1, including input port IN, one end and input port IN phases
Even, the first transmission line 1 of other end ground connection, one end is connected with the first transmission line 1, the second transmission line 5 that the other end is grounded and
Electric capacity, the resonator that the feed circuit passes through capacitance connection wave filter, gives the energy to resonator.Alternatively, the first transmission
Line can be grounded by the first via, and the second transmission line can be grounded by the second via.
The corresponding structure chart of the feed circuit is shown in Fig. 2A and Fig. 2 B, including transmission line 2, and the transmission line 2 is connection input
The transmission line of mouth and the first transmission line, 1 and 5 are respectively the first transmission line and the second transmission line, the first via 6 and the second via 7
And electric capacity 3.Because the first transmission line 1 and the second transmission line 5 are grounded, therefore inductance element is functionally equivalent to, that is, filtered
Low frequency signal, and then cause that high-frequency signal passes through, transmission line 2 is connected with the first transmission line 1 and the second transmission line 5, and first passes
Defeated line 1 is grounded by the first via 6, and the second transmission line 5 is grounded by the second via 7, and the second transmission line 5 is by electric capacity 3 and filter
The resonator of ripple device is connected.After signal is by the feed-in of transmission line 2, low frequency signal is distinguished by the first transmission line 1 and the second transmission line 5
Ground is transferred to via the first via 6 and the second via 7, high-frequency signal is transferred on resonator 4 by electric capacity 3, and other signals are anti-
It is emitted back towards, it is achieved thereby that feeding function, and filtered out low frequency signal by transmission line ground connection so that high-frequency signal passes through.
It should be noted that the first above-mentioned transmission line 1 and the second transmission line 5 can be same transmission lines, it is also possible to
It is two separate transmission lines, is not especially limited herein.And, although the first transmission line in structure chart 2A and Fig. 2 B
To be connected with input port by transmission line 2, but reflection in circuit diagram, be still presented as one end of the first transmission line with
Input port is connected.
Also, it should be noted that be that the second transmission line is connected with electric capacity when being described above, when practical operation,
Can also be that the first transmission line is connected with electric capacity, or the first transmission line and the second transmission line are connected with electric capacity.
The metal wire that the embodiment of the present application is grounded using end, i.e. the first transmission line 1 and second in Fig. 2A and Fig. 2 B
Transmission line 5, low frequency signal is transferred on the ground, is just equivalent to and grounded inductor is introduced in feed circuit, by this structure
Feed circuit is powered for the resonator of wave filter, enables to wave filter to produce transmission zero in the low side of passband, improves filtering
The Out-of-band rejection ability of device, so as to improve the rectangular degree of wave filter low side.
It should be noted that resonator is not belonging to a part for feed circuit, for convenience, the embodiment of the present application exists
Resonator is introduced in Fig. 2A and Fig. 2 B.
The first transmission line 1 and/or the second transmission line 5 in the embodiment of the present application twist can also be connected with via,
By the first transmission line 1 twist as a example by, as shown in Figure 3 A and Figure 3 B, the first transmission line 1 twist connects via the first via 6
Ground, the second transmission line 5 is grounded via the second via 7, and the second transmission line 5 is connected by electric capacity 3 with resonator 4, signal by
After the feed-in of transmission line 2, low frequency signal is by the second transmission line 5 and the first transmission line 1 respectively via the second via 7 and the first via
6 are transferred on the ground, and high-frequency signal is transferred on resonator via electric capacity 3, and other signal reflexs are gone back, it is achieved thereby that feed work(
Energy.Certainly, the second transmission line twist can also be grounded via via, and transmission line twist, can cause biography more long
Defeated line takes less space in circuit, on the premise of circuit volume is not increased, realizes the function of supplying power of feed circuit.
Alternatively, as shown in Figure 4 A and 4 B shown in FIG., one end of the connection input port of the first transmission line 1 is folded upward at a spacing
It is connected from the first via 6, certainly, one end of the connection input port of the first transmission line 1 can also downwards bend certain distance
Be connected (not shown) with the first via 6 again, when transmission line is more long, can reduce transmission line by bending and take circuit
Volume.
Alternatively, as shown in Figure 5 A and 5B, one end of the via of connection first of the first transmission line 1 is folded upward at certain distance
It is connected with the second via 7.Certainly, one end of the via of connection first of the first transmission line 1 can also downwards bend certain distance again
Be connected (not shown) with the second via 7, equally, when transmission line is more long, the first via is connected by the first transmission line 1
One end is folded upward at, it is possible to reduce transmission line takes the volume of circuit.
Further, the second transmission line can also exist curved between one end and one end of ground connection for connecting the first transmission line
Folding, both can be connect the first transmission line one end be folded upward at or downwards bend, or be grounded one end be bent up
Folding bends downwards (not shown).
Based on identical inventive concept, the embodiment of the present application additionally provides a kind of high-pass type bandpass filter, including above-mentioned
Feed circuit resonator, be illustrated in figure 6 the equivalent circuit diagram of wave filter, the part that dotted line frame is identified is respectively input
Feed circuit and output feed circuit, wherein input feed circuit include input transmission line, two ground connection transmission lines and one
Electric capacity, output feed circuit includes output transmission line, and two transmission lines and electric capacity of ground connection, input feed circuit and output feed
Circuit is connected by electric capacity with the resonator of wave filter.
It is described as a example by comprising 8 wave filters of resonator below, wave filter is generally divided into upper-layer micro-strip structure, in
Between medium substrate and underlying metal base plate three-decker, be as shown in Figure 7 A the plane structure chart of wave filter, Fig. 7 B are wave filter
Three-dimensional structure diagram, from the two figures as can be seen that wave filter include feed circuit resonator, resonator is by resonant rod 8
Constituted with ground hole 9, resonant rod 8 is connected by ground hole 9 in medium substrate surface with the back side of medium substrate.Signal is by defeated
Enter the transmission line feed-in of feed circuit, wherein low frequency signal is transferred on the ground by the transmission line of feed circuit via via, high
Frequency signal via the capacitive transmission of feed circuit on resonator, go back, and is transferred to the signal on resonator by other signal reflexs
Coupled by between resonator again, resonance realizes filtering.
Because in above-mentioned wave filter, after signal is by input transmission line feed-in, low frequency signal has been transferred to ground, equivalent to
Grounded inductor is introduced in feed circuit, transmission zero is introduced so as to the passband low side in wave filter, it is logical to wave filter
Frequency with low side is eliminated, and improves the Out-of-band rejection ability of wave filter.
Based on above-mentioned high-pass type bandpass filter, the embodiment of the present application additionally provides a kind of switch filtering device assembly, such as
Shown in Fig. 8, the filter assembly includes the wave filter group being made up of above-mentioned high-pass type bandpass filter, and shown in Fig. 8 is 4
High-pass type bandpass filter F1, F2, F3, F4 constitute wave filter group, and input radio frequency interface IN exports radio frequency interface OUT, input
RF switch S1, exports RF switch S2, and switch control module, as illustrated, the input of S1 is with input radio frequency IN's
Output end is connected, and the output end of S1 is connected with wave filter group, and one end connection wave filter group of S2, other end connection output radio frequency connects
Mouth OUT, and switch control module is connected with S1 and S2, to select the frequency range to be filtered by controlling S1 and S2.
Above-mentioned filter assembly because employ the high-pass type bandpass filter described in the embodiment of the present invention, therefore
The rectangular degree of component low side and the Out-of-band rejection of component low side are improve, so as to be effectively improved multi-channel switch filter assembly
Filtering characteristic.
As shown in figure 9, the embodiment of the present invention additionally provides a kind of switch integrated signal preselector, including by it is above-mentioned at least
The wave filter group that two high-pass type bandpass filters are constituted, is illustrated in figure 9 high-pass type bandpass filter F1, F2, F3, F4 tetra-
Wave filter constitutes wave filter group, input IN, output end OUT, low noise amplifier module, at least two attenuators composition
Attenuator group and control module, are exactly as shown in Figure 9 four attenuator groups of attenuator A1, A2, A3, A4 composition；Low noise
One end of amplifier module is connected with input, and the other end is connected with attenuator group；One end of attenuator group and low noise amplification
Device module is connected, and the other end is connected with wave filter group, for selecting decay path；One end of wave filter group and attenuator group phase
Even, the other end is connected with output end, the frequency range for selecting filtering；Control module and low noise amplifier module, attenuator group,
Wave filter group is connected, for being controlled to filtered switch.
Above-mentioned low noise amplifier module includes through path and low noise amplification path, and two paths pass through one one
Two switch is selected to be selected.
Preselector is applied to transmitting and/or the receiving portion of communication system, can effectively suppress signal and be produced in path
Raw harmonic wave, image frequency and other spurious signals, the preselector in the embodiment of the present application have used above-mentioned in signal receiving part point
High-pass type bandpass filter, therefore the rectangular degree and the Out-of-band rejection ability to low side of preselector low side can be improved.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the division of unit,
It is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can be with
With reference to or be desirably integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or discussed
Coupling each other or direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, be shown as unit
Part can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple networks
On unit.Some or all of unit therein can be according to the actual needs selected to realize the purpose of this embodiment scheme.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that the independent physics of unit includes, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list
Unit can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can store and be deposited in an embodied on computer readable
In storage media.Above-mentioned SFU software functional unit storage is in a storage medium, including some instructions are used to so that a computer
Equipment (can be personal computer, server, or network equipment etc.) performs the part step of each embodiment method of the invention
Suddenly.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-Only Memory, abbreviation ROM), with
Machine access memory (Random Access Memory, abbreviation RAM), magnetic disc or CD etc. are various can be with store program codes
Medium.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of feed circuit of wave filter, it is characterised in that including input port, one end is connected with the input port, separately
First transmission line of one end ground connection, one end is connected with first transmission line, second transmission line and electric capacity of other end ground connection,
First transmission line and/or the second transmission line are connected with the electric capacity, are used to by the capacitance connection resonator, and be
The resonator is powered.
2. feed circuit according to claim 1, it is characterised in that first transmission line is grounded by the first via,
Second transmission line is grounded by the second via.
3. according to any described feed circuit of claim 1 or 2, it is characterised in that first transmission line and/or described the
Two transmission lines are shaped as spirality.
4. feed circuit according to claim 2, it is characterised in that the connection input port of first transmission line
One end bend up or down after be connected with first via.
5. feed circuit according to claim 2, it is characterised in that one end of the ground connection of first transmission line upwards or
It is connected with first via after bending downwards.
6. according to any described feed circuit of claim 1 or 2, it is characterised in that second transmission line is described in connection
There is bending between one end of first transmission line and earth terminal.
7. a kind of high-pass type bandpass filter, it is characterised in that including any described feed electricity of claim 1 or 2 or 4 or 5
Road and at least two resonators, the feed circuit are connected with the resonator, for being powered for the resonator, the resonance
Device is used to filter.
8. a kind of switch filtering device assembly, it is characterised in that including by least two high-pass type band logicals as claimed in claim 7
Wave filter group into wave filter group, input radio frequency interface, export radio frequency interface, input radio frequency switch, export RF switch, and
Switch control module；The input of the input radio frequency switch is connected with the output end of the input radio frequency interface, the input
The output end of RF switch is connected with the wave filter group, and one end of the output RF switch connects the wave filter group, separately
One end connects the output radio frequency interface.The switch control module is switched and the output RF switch with the input radio frequency
Connection, for switching switch to select the frequency range of filtering.
9. it is a kind of to switch integrated signal preselector, including by least two high-pass type bandpass filters as claimed in claim 7
The wave filter group of composition, input, output end, low noise amplifier module, at least two attenuators composition attenuator group with
And control module；
One end of the low noise amplifier module is connected with the input, and the other end is connected with the attenuator group；
One end of the attenuator group is connected with the low noise amplifier module, and the other end is connected with the wave filter group, uses
In selection decay path；
One end of the wave filter group is connected with the attenuator group, and the other end is connected with the output end, for selecting to filter
Frequency range；
The control module and the low noise amplifier module, the attenuator group, the wave filter group are connected, for right
Filtered switch is controlled.
10. it is according to claim 9 to switch integrated signal preselector, it is characterised in that the low noise amplifier module
Including through path and low noise amplification path, the through path and the low noise amplification path select two by one one
Switch is selected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077121 | 2017-02-13 | ||
| CN201710077121X | 2017-02-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106788313A true CN106788313A (en) | 2017-05-31 |
| CN106788313B CN106788313B (en) | 2023-10-10 |
Family
ID=58960867
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720176915.7U Withdrawn - After Issue CN206878789U (en) | 2017-02-13 | 2017-02-27 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
| CN201710109140.6A Active CN106788313B (en) | 2017-02-13 | 2017-02-27 | Feed circuit of filter and device based on feed circuit |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720176915.7U Withdrawn - After Issue CN206878789U (en) | 2017-02-13 | 2017-02-27 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN206878789U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612520A (en) * | 2017-09-20 | 2018-01-19 | 戴承萍 | Bandpass filter |
| CN111010141A (en) * | 2019-11-15 | 2020-04-14 | 天津大学 | Filter, radio frequency front-end circuit and communication device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206878789U (en) * | 2017-02-13 | 2018-01-12 | 石家庄创天电子科技有限公司 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
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- 2017-02-27 CN CN201710109140.6A patent/CN106788313B/en active Active
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| US20100026420A1 (en) * | 2008-07-29 | 2010-02-04 | Industrial Technology Research Institute | Band-pass filter circuit and multi-layer structure and method thereof |
| TW201220591A (en) * | 2010-11-11 | 2012-05-16 | Mezzalingua John Ass | Filter circuit |
| CN102522615A (en) * | 2011-12-01 | 2012-06-27 | 华南理工大学 | Miniature dual-band band-pass filter with adjustable low band |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107612520A (en) * | 2017-09-20 | 2018-01-19 | 戴承萍 | Bandpass filter |
| CN111010141A (en) * | 2019-11-15 | 2020-04-14 | 天津大学 | Filter, radio frequency front-end circuit and communication device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106788313B (en) | 2023-10-10 |
| CN206878789U (en) | 2018-01-12 |
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