CN208539072U - Bandstop filter and communication cavity device - Google Patents
Bandstop filter and communication cavity device Download PDFInfo
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- CN208539072U CN208539072U CN201821164609.2U CN201821164609U CN208539072U CN 208539072 U CN208539072 U CN 208539072U CN 201821164609 U CN201821164609 U CN 201821164609U CN 208539072 U CN208539072 U CN 208539072U
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Abstract
The utility model relates to a kind of bandstop filter and communication cavity device, bandstop filter includes that outer conductor, transmission line, multiple resonant columns and multiple impedances convert detail.Outer conductor is equipped with multiple resonant cavities along first direction side by side.Resonant column bottom end and resonant cavity bottom wall are electrically connected, and resonance top end and resonant cavity roof interval are arranged.Impedance converts detail and transmission line is electrically connected, and impedance transformation detail is wound around resonant column side wall perimeter, and impedance, which converts, is equipped with interval between detail and resonant column side wall.Above-mentioned bandstop filter, since impedance transformation detail is wound around resonant column side wall perimeter, such impedance transformation detail and resonant column side wall can form biggish coupling amount, pass through the impedance magnitude of cooperation adjustment transmission line, just can be small and the demanding transmission signal of belt resistance inhibitor system plays preferable filter action to passband and stopband interval, again while suitable for the wider transmission signal of bandwidth of rejection.
Description
Technical field
The utility model relates to wave filter technology fields, more particularly to a kind of bandstop filter and communication cavity device.
Background technique
Traditional bandstop filter includes transmission line, coupling disc and resonant column.Coupling disc and transmission line are electrically connected, coupling
Disk forms coupled capacitor between the side wall and resonant column of resonant column.Energy after coupled capacitor is combined with the impedance on transmission line
Enough play the role of being filtered the transmission signal on transmission line.However, passband and resistance when the transmission signal on transmission line
Spaced smaller (relative bandwidth be lower than 2%) and when inhibiting to require high (30dB or more) to stopband, traditional stop-band filter
It can be poor to the filter effect for transmitting signal on transmission line.
Summary of the invention
Based on this, it is necessary to overcome the deficiencies of existing technologies, provide a kind of bandstop filter and communication cavity device, it is right
Passband and stopband interval is small and the good wave filtering effect of the demanding transmission signal of belt resistance inhibitor system.
Its technical solution is as follows: a kind of bandstop filter, comprising: outer conductor and transmission line, the outer conductor is along first party
To multiple resonant cavities are equipped with side by side, the opposite end of the outer conductor in said first direction is respectively arranged with the first connecting pin
Mouthful with second connection end mouth, described transmission line one end and first connectivity port be electrically connected, the transmission line other end with
The second connection end mouth is electrically connected, and the resonant cavity side wall is equipped with thread passing port, and the transmission line is along the first direction
Sequentially pass through the thread passing port；Multiple resonant columns and multiple impedances convert detail, and multiple resonant columns, multiple impedances become
Change detail to the resonant cavity is corresponding one by one is arranged, the resonant column and impedance transformation detail are respectively positioned on the resonant cavity
Interior, the resonant column bottom end and the resonant cavity bottom wall are electrically connected, the resonance top end and resonant cavity roof interval
Setting, the impedance transformation detail and the transmission line are electrically connected, and the impedance transformation detail is wound around the resonant column side
Wall periphery is equipped with interval between the impedance transformation detail and the resonant column side wall.
A kind of communication cavity device, including the bandstop filter.
Above-mentioned bandstop filter and cavity devices, since impedance transformation detail is wound around resonant column side wall perimeter, so
Impedance transformation detail and resonant column side wall can form biggish coupling amount, by the impedance magnitude of cooperation adjustment transmission line, just can
It reaches small to passband and stopband interval and the demanding transmission signal of belt resistance inhibitor system plays preferable filter action, again while suitable
For the wider transmission signal of bandwidth of rejection.
Further, the impedance transformation detail is the arc shape being adapted with the resonant column side wall perimeter, alternatively, institute
Stating impedance transformation detail is the coupling ring for being wound around the resonant column side wall perimeter.
Further, the resonant column is equipped with step, and the impedance transformation detail is disposed adjacent with the step, and institute
State impedance transformation detail and the step Insulation Coordination.
Further, Insulation Coordination is kept by insulating isolation ring between the impedance transformation detail and the step；Institute
It states insulating isolation ring to be set in outside the resonant column and be located on the step, the wherein one side of the insulating isolation ring is around institute
It states insulating isolation ring and is circumferentially provided with annular groove, the impedance transformation detail is installed in the annular groove.
Further, the bandstop filter further includes insulation board, the insulation board include the first support plate and with it is described
Connected multiple second support plates of first support plate, first support plate sequentially pass through the side of the resonant cavity along the first direction
Wall, the transmission line are arranged on first support plate；Second support plate to the resonant cavity is corresponding one by one is arranged, described
Two support plates are equipped with first through hole corresponding with the resonant column, and second support plate is set on the resonant column, and described the
Two support plates are located on the step, and the impedance transformation detail is located on second support plate.
Further, resonant column bottom end end face and the resonant cavity bottom wall are equipped with interval, resonant column bottom end end
Face has extended to form blind hole along the resonant column axial direction, and the resonant cavity bottom wall is equipped with conducting boss, the conductive stud
Platform extend into the blind hole with the blind hole bottom wall be electrically connected, between the blind hole side wall and the conducting boss side wall between
Every setting.
Further, the outer conductor top surface opposite with the resonant cavity bottom wall is equipped with dismountable lid；The lid
Body is equipped with the second through-hole, is equipped with liftable tuning plug in second through-hole.
Further, the bandstop filter further includes the nut being fixed on the lid, the nut
Screw hole is corresponding to the through-hole to be arranged, and the tuning plug is the screw rod or screw matched with the nut, and the tuning plug is worn
The screw hole and second through-hole for crossing the nut are extend into the resonant cavity.
Further, the resonant column towards the tuning plug top end face be equipped with recess portion, the recess portion with it is described
Tuning plug is accordingly arranged.
Detailed description of the invention
Fig. 1 is the decomposition diagram of bandstop filter described in an embodiment of the present invention；
Fig. 2 is the schematic cross-section of bandstop filter described in an embodiment of the present invention；
Fig. 3 is the measured drawing of bandstop filter described in an embodiment of the present invention.
Appended drawing reference:
10, outer conductor, 11, resonant cavity, the 12, first connectivity port, 13, second connection end mouth, 14, conducting boss, 15, lid
Body, 16, tuning plug, 17, nut, 20, transmission line, 30, resonant column, 31, step, 32, blind hole, 33, recess portion, 40, impedance transformation
Detail, 50, insulating isolation ring, 51, annular groove.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.Many details are explained in the following description in order to abundant
Understand the utility model.But the utility model can be implemented with being much different from other way described herein, this field
Technical staff can do similar improvement without prejudice to the utility model connotation, therefore the utility model is not by following public affairs
The limitation for the specific embodiment opened.
In the description of the present invention, it should be understood that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include at least one of the features.In the description of the present invention,
The meaning of " plurality " is at least two, such as two, three etc., unless otherwise specifically defined.
In the description of the present invention, it should be understood that when an element is considered as " connection " another element,
It can be directly to another element or may be simultaneously present intermediary element.On the contrary, when element be referred to as " direct " and
When another element connects, intermediary element is not present.
In one embodiment, Fig. 1 and Fig. 2, a kind of bandstop filter are please referred to, comprising: outer conductor 10, transmission line 20,
Multiple resonant columns 30 convert detail 40 with multiple impedances.The outer conductor 10 is equipped with multiple resonant cavities 11 along first direction side by side,
The opposite end of the outer conductor 10 in said first direction is respectively arranged with the first connectivity port 12 and second connection end mouth
13.In order to enable the volume of bandstop filter is as small as possible, outer conductor 10 is specially rectangular-shape, and first direction is specially to grow
The longitudinal direction of cube, so that resonant cavity 11 is set gradually along the longitudinal direction of cuboid, can improve space utilization rate,
Space utilization is reasonable.Certainly, outer conductor 10 not being limited yet and being set to rectangular-shape, outer conductor 10 is also possible to cube-shaped, column
Body shape, gengon shape etc..
Described 20 one end of transmission line and first connectivity port 12 are electrically connected, 20 other end of transmission line with it is described
Second connection end mouth 13 is electrically connected.11 side wall of resonant cavity is equipped with thread passing port, and the transmission line 20 is along the first party
To sequentially passing through the thread passing port.Specifically, when two neighboring resonant cavity 11 is completely separated by 11 side wall of resonant cavity, it should
Thread passing port can be the cable hole being opened on 11 side wall of resonant cavity；When 11 side wall of resonant cavity between two neighboring resonant cavity 11
When end is reserved with opening, which is interconnected by the reserved opening, at this time without in resonance
Cable hole is opened up on 11 side wall of chamber, by reserved opening directly as thread passing port.
Multiple resonant columns 30, multiple impedances transformation detail 40 to the resonant cavity 11 is corresponding one by one is arranged.
The resonant column 30 is respectively positioned in the resonant cavity 11 with impedance transformation detail 40,30 bottom end of resonant column with it is described humorous
11 bottom wall of chamber that shakes is electrically connected, and 30 top of resonant column and the 11 roof interval of resonant cavity are arranged.The impedance transformation branch
Section 40 is electrically connected with the transmission line 20, and the impedance transformation detail 40 is wound around 30 side wall perimeter of resonant column, described
Impedance, which converts, is equipped with interval between detail 40 and 30 side wall of the resonant column.
Above-mentioned bandstop filter, since impedance transformation detail 40 is wound around 30 side wall perimeter of resonant column, such impedance becomes
Biggish coupling amount can be formed by changing detail 40 and 30 side wall of resonant column, pass through the impedance magnitude of cooperation adjustment transmission line 20.It please one
And refering to Fig. 3, by carrying out emulation experiment to bandstop filter, it is found which small to passband and stopband interval and stopband presses down
The demanding transmission signal of system plays preferable filter action, again while being suitable for the wider transmission signal of bandwidth of rejection.
Further, referring again to Fig. 1, the impedance transformation detail 40 is to be adapted with 30 side wall perimeter of resonant column
Arc shape, alternatively, the impedance transformation detail 40 be the coupling ring for being wound around 30 side wall perimeter of resonant column.Wherein, it hinders
The arc range that resistance changes detail 40 is determined according to coupling amount, when impedance converts the arc range difference of detail 40, often
The coupling amount power of a chamber is different.In the case where guaranteeing the consistency of thickness of impedance transformation detail 40, if by coupling ring
The weak region of coupling amount cut away and can realize bigger high Low ESR transformation range, while also ensuring stronger coupling amount
Transmission.In this way, passband and stopband interval smaller (relative bandwidth is lower than 2%) may be implemented and inhibit to require to stopband high
The index request of (30dB or more)).
Specifically, when impedance transformation detail 40 is the arc shape being adapted with 30 side wall perimeter of resonant column, i.e.,
Impedance transformation detail 40 is wound around outside resonant column 30 in such as 60 degree, 90 degree or 180 degree, and impedance converts detail 40 and resonant column 30
It is larger that coupling amount is formed by between side wall；When impedance transformation detail 40 is the coupling for being wound around 30 side wall perimeter of resonant column
When ring, i.e., impedance converts 40 360 degree of detail and is wound around outside resonant column 30, and impedance converts between detail 40 and 30 side wall of resonant column
It is bigger than coupling amount caused by the impedance of arc shape transformation detail 40 to be formed by coupling amount.In order to passband and stopband interval
The transmission signal of hour plays preferable filter action, and each impedance transformation detail 40 and the stiffness of coupling of resonant column 30 are different
It causes, so impedance can be converted into detail 40 and be designed to different shapes, such as four illustrated in figure impedance converts detail
40 are followed successively by 120 degree of arc shapes, 180 degree arc shape, coupling ring and 240 degree of arc shapes from left to right.Specifically how to be arranged can be with
It is obtained according to the actual situation by emulation experiment.
In one embodiment, the resonant column 30 is equipped with step 31.The impedance transformation detail 40 and the step
31 are disposed adjacent, and impedance transformation detail 40 and 31 Insulation Coordination of step.In this way, not due to impedance transformation detail 40
Only cooperate with 30 sidewall coupling of resonant column, cooperation is also coupled with step 31, such impedance transformation detail 40 is with resonant column 30 humorous
Shake column 30 axial direction and have coupling amount in the radial direction, so as to increase coupling width, bandreject filtering can be made
The phase width of device reaches 30% or more coupling width.In addition, apparatus structure is simple, the whole body of bandstop filter can be reduced
Product, meets the dilatation needs under extreme condition, low in cost, is suitble to integrated and miniaturization.
Specifically, impedance transformation detail 40 can both be located at 31 top of step, can be with 31 phase coupling of step on step 31
It closes, and can be convenient for being installed in resonant column 30；Impedance, which converts detail 40, can also be located at 31 lower section of step, below step 31
Be able to achieve and be coupled with step 31, specifically can by viscose glue it is viscous set be installed on resonant column 30 or by being fixed on it is humorous
It shakes on column 30.
In one embodiment, insulation is kept to match by insulating isolation ring between the impedance transformation detail and the step
It closes.Specifically, the insulating isolation ring 50 is set in outside the resonant column 30 and is located on the step 31, described to be dielectrically separated from
The wherein one side of ring 50 is circumferentially provided with annular groove 51 around the insulating isolation ring 50.The impedance transformation detail 40 is installed in
In the annular groove 51.Keep apart in this way, insulating isolation ring 50 can convert impedance between detail 40 and resonant column 30, thus
Realize the coupling ring Insulation Coordination between step 31, resonant column 30 respectively.Insulating isolation ring 50 is specifically situated between using polytetrafluoroethylene (PTFE)
Matter ring.In one embodiment, and it is not provided with insulating isolation ring 50, but is converted on detail 40 or 30 side wall of resonant column in impedance
It is provided with coatings layer or insulating blanket, impedance transformation detail 40 can also be made to match respectively with step 31, the insulation of resonant column 30
It closes.It in one embodiment, is not setting annular groove 51 on the wherein one side of the insulating isolation ring 50, but, insulation
U-lag is set on the side of isolation ring 50 or section is L-shaped mounting groove or other shapes of mounting groove.
In another embodiment, the bandstop filter further includes insulation board.The insulation board includes the first support plate
And multiple second support plates being connected with first support plate.First support plate sequentially passes through described humorous along the first direction
The side wall of vibration chamber 11, the transmission line 20 are arranged on first support plate.Second support plate and the resonant cavity 11 are one by one
Corresponding setting, second support plate are equipped with first through hole corresponding with the resonant column 30, and second support plate is set in described
On resonant column 30, and second support plate is located on the step 31, and the impedance transformation detail 40 is located at second support plate
On.It is separated by this way, insulation board can make transmission line 20 insulate with outer conductor 10, and makes impedance transformation detail 40 and resonant column
30 insulation are separated by, and transmission line 20 and impedance transformation detail 40 may each be the conductive sheet or microstrip line being laid on insulation board, energy
So that the structure of bandstop filter simplifies, packaging efficiency is higher.In addition, insulation board, transmission line 20 and impedance transformation detail 40 can
To process to obtain by circuit board manufacturing process.
Further, the 30 bottom end end face of resonant column and 11 bottom wall of resonant cavity are equipped with interval, the resonant column 30
Bottom end end face has extended to form blind hole 32 along 30 axial direction of resonant column.11 bottom wall of resonant cavity is equipped with conducting boss
14.The conducting boss 14 extend into the blind hole 32 with 32 bottom wall of blind hole be electrically connected, 32 side wall of blind hole with
Setting is spaced between 14 side wall of conducting boss.In this way, after conducting boss 14 is set in the blind hole 32 of resonant column 30, it can
The resonance frequency of bandstop filter is greatly reduced, so as to reduce the overall volume of bandstop filter, meets under extreme condition
Dilatation need.Specifically, when the spacing between 11 lateral wall of 30 lateral wall of resonant column and resonant cavity is smaller, outside resonant column 30
The coupled capacitor of side wall and 11 lateral wall of resonant cavity is bigger, and as formed resonance frequency will be smaller.
Further, the outer conductor 10 top surface opposite with 11 bottom wall of resonant cavity is equipped with dismountable lid 15.
The lid 15 is equipped with the second through-hole, is equipped with liftable tuning plug 16 in second through-hole.In this way, by adjusting tuning plug
16 extend into the depth in resonant cavity 11, just can change the resonance frequency of bandstop filter.
Further, the bandstop filter further includes the nut 17 being fixed on the lid 15.The spiral shell
The screw hole of mother 17 is corresponding to the through-hole to be arranged.The tuning plug 16 is the screw rod or screw matched with the nut 17, institute
Tuning plug 16 is stated to extend into the resonant cavity 11 across the screw hole of the nut 17 and second through-hole.In this way, rotation is adjusted
Humorous bar 16 can control the depth that tuning plug 16 is inserted into resonant cavity 11, more conveniently so as to bandreject filtering
The resonance frequency of device is adjusted.In addition, first through hole can not have to the threaded hole for being designed as cooperating with tuning plug 16, reduce
The difficulty of processing of lid 15.
Optionally, without on lid 15 be arranged nut 17, second through-hole be screw hole, the tuning plug 16 for institute
State the screw rod or screw that screw hole matches.In this way, rotation tuning bar 16, can control tuning plug 16 and be inserted into more conveniently
Depth in resonant cavity 11 is adjusted so as to the resonance frequency to bandstop filter.
It optionally, is damping cooperation between tuning plug 16 and first through hole side wall, push-and-pull tuning plug 16 in this way arrives resonant cavity
Behind predetermined depth position in 11, due to having certain frictional force between tuning plug 16 and first through hole side wall, in frictional force
Under the action of tuning plug 16 can be made to be arranged on lid 15 relatively fixedly.
Further, the resonant column 30 is equipped with recess portion 33, the recess portion towards the top end face of the tuning plug 16
33 settings corresponding to the tuning plug 16.In this way, recess portion 33 makes as evacuation position when tuning plug 16 is pushed into resonant cavity 11
Tuning plug 16 will not be contacted by obtaining resonant column 30, and the depth that tuning plug 16 extend into resonant cavity 11 is relatively large, guarantee bandreject filtering
The relatively wide adjusting range of the resonance frequency of device, so as to the volume of opposite reduction low-frequency range bandstop filter.
In one embodiment, a kind of communication cavity device, including bandstop filter described in any of the above-described embodiment.On
The communication cavity device stated, due to include the bandstop filter, technical effect is identical as the bandstop filter, not into
Row repeats.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of bandstop filter characterized by comprising
Outer conductor and transmission line, the outer conductor are equipped with multiple resonant cavities along first direction side by side, and the outer conductor is described
Opposite end on one direction is respectively arranged with the first connectivity port and second connection end mouth, described transmission line one end and described the
One connectivity port is electrically connected, and the transmission line other end and the second connection end mouth are electrically connected, the resonant cavity side wall
Equipped with thread passing port, the transmission line sequentially passes through the thread passing port along the first direction；
Multiple resonant columns and multiple impedances convert detail, multiple resonant columns, multiple impedance transformation details with it is described
Resonant cavity is accordingly arranged one by one, and the resonant column and impedance transformation detail are respectively positioned in the resonant cavity, the resonant column
Bottom end and the resonant cavity bottom wall are electrically connected, and the resonance top end and resonant cavity roof interval are arranged, the impedance
It converts detail and the transmission line is electrically connected, the impedance transformation detail is wound around the resonant column side wall perimeter, the resistance
Resistance, which changes, is equipped with interval between detail and the resonant column side wall.
2. bandstop filter according to claim 1, which is characterized in that impedance transformation detail is and the resonant column
The adaptable arc shape of side wall perimeter, alternatively, impedance transformation detail is the coupling for being wound around the resonant column side wall perimeter
Ring.
3. bandstop filter according to claim 1, which is characterized in that the resonant column is equipped with step, the impedance
Transformation detail is disposed adjacent with the step, and impedance transformation detail and the step Insulation Coordination.
4. bandstop filter according to claim 3, which is characterized in that between the impedance transformation detail and the step
Insulation Coordination is kept by insulating isolation ring；The insulating isolation ring is sheathed on the step, the insulating isolation ring its
Middle one side is circumferentially provided with annular groove around the insulating isolation ring, and the impedance transformation detail is installed in the annular groove.
5. bandstop filter according to claim 3, which is characterized in that further include insulation board, the insulation board includes the
One support plate and multiple second support plates being connected with first support plate, first support plate are sequentially passed through along the first direction
The side wall of the resonant cavity, the transmission line are arranged on first support plate；Second support plate and the resonant cavity are one by one
Corresponding setting, second support plate are equipped with first through hole corresponding with the resonant column, and second support plate is set in described humorous
It shakes on column, and second support plate is located on the step, the impedance transformation detail is located on second support plate.
6. bandstop filter according to claim 1, which is characterized in that resonant column bottom end end face and the resonant cavity
Bottom wall is equipped with interval, and resonant column bottom end end face has extended to form blind hole, the resonance along the resonant column axial direction
Bottom of chamber wall is equipped with conducting boss, and the conducting boss is extend into the blind hole to be electrically connected with the blind hole bottom wall, described blind
Setting is spaced between hole side wall and the conducting boss side wall.
7. bandstop filter according to claim 1, which is characterized in that the outer conductor is opposite with the resonant cavity bottom wall
Top surface be equipped with dismountable lid；The lid is equipped with the second through-hole, is equipped with liftable tuning plug in second through-hole.
8. bandstop filter according to claim 7, which is characterized in that further include the spiral shell being fixed on the lid
Mother, the screw hole of the nut is corresponding to the through-hole to be arranged, and the tuning plug is the screw rod or screw matched with the nut,
The tuning plug passes through the screw hole of the nut and second through-hole is extend into the resonant cavity.
9. bandstop filter according to claim 7 or 8, which is characterized in that the resonant column is towards the tuning plug
Top end face is equipped with recess portion, and the recess portion is corresponding to the tuning plug to be arranged.
10. a kind of communication cavity device, which is characterized in that including bandreject filtering as claimed in any one of claims 1 to 9
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821164609.2U CN208539072U (en) | 2018-07-23 | 2018-07-23 | Bandstop filter and communication cavity device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821164609.2U CN208539072U (en) | 2018-07-23 | 2018-07-23 | Bandstop filter and communication cavity device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208539072U true CN208539072U (en) | 2019-02-22 |
Family
ID=65386604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821164609.2U Active CN208539072U (en) | 2018-07-23 | 2018-07-23 | Bandstop filter and communication cavity device |
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| Country | Link |
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| CN (1) | CN208539072U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879050A (en) * | 2018-07-23 | 2018-11-23 | 京信通信系统（中国）有限公司 | Bandstop filter and communication cavity device |
| CN111988012A (en) * | 2020-08-24 | 2020-11-24 | 武汉博畅通信设备有限责任公司 | 270-plus 678MHz frequency hopping filter |
-
2018
- 2018-07-23 CN CN201821164609.2U patent/CN208539072U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879050A (en) * | 2018-07-23 | 2018-11-23 | 京信通信系统（中国）有限公司 | Bandstop filter and communication cavity device |
| CN108879050B (en) * | 2018-07-23 | 2024-01-30 | 京信通信技术(广州)有限公司 | Band-stop filter and communication cavity device |
| CN111988012A (en) * | 2020-08-24 | 2020-11-24 | 武汉博畅通信设备有限责任公司 | 270-plus 678MHz frequency hopping filter |
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Effective date of registration: 20200115 Address after: 510730 Guangdong city of Guangzhou province Guangzhou economic and Technological Development Zone Jinbi Road No. 6 Patentee after: Jingxin Communication Technology (Guangzhou) Co., Ltd. Address before: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Co-patentee before: Jingxin Communication Technology (Guangzhou) Co., Ltd. Patentee before: Jingxin Communication System (China) Co., Ltd. Co-patentee before: Jingxin Communication System (Guangzhou) Co., Ltd. Co-patentee before: TIANJIN COMBA TELECOM SYSTEMS CO., LTD. |