CN208548439U - Cavity body filter - Google Patents
Cavity body filter Download PDFInfo
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- CN208548439U CN208548439U CN201820987059.8U CN201820987059U CN208548439U CN 208548439 U CN208548439 U CN 208548439U CN 201820987059 U CN201820987059 U CN 201820987059U CN 208548439 U CN208548439 U CN 208548439U
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- cavity
- body filter
- cavity body
- threaded portion
- cover board
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Abstract
The utility model discloses a kind of cavity body filters, comprising: the upper end of cavity, the cavity has opening；Resonant rod, the resonant rod are placed in the cavity, and the resonant rod has the resonance plate towards the opening；Cover board, the cover board covers the opening of the cavity, and the cover board offers the through-hole being connected to the cavity at the position of the correspondence resonance plate；Disk is tuned, the tuning disk is installed in the through-hole and has the adjusting freedom degree on the axial direction of the through-hole；Wherein, the diameter of the tuning disk is less than the diameter of the resonance plate.Based on the utility model, power capacity can be effectively improved, tuning amount is increased and reduces the height of cavity body filter.
Description
Technical field
The utility model relates to the communication technology, in particular to a kind of cavity body filter.
Background technique
Filter is the device that a kind of pair of electromagnetic wave signal has processing to act on, and main function is: useful signal being allowed to the greatest extent may be used
Zero-decrement it can pass through, the reflection as big as possible to garbage signal.Cavity body filter is generallyd use in base station system at present to hair
It penetrates signal or receives signal and carry out frequency selection.As shown in Figure 1, cavity body filter generally includes cavity 11, resonant rod 12, tuning
Screw rod 13 and cover board 14.Cavity is equipped with cavity, and resonant rod on the boss 15 of cavity, and is contained in conjunction with cavity
In cavity, cover board is installed on the opening of cavity, and cover board is equipped with screw hole, and the position of screw hole is corresponding with resonant rod.Tune spiral shell
Bar is matched with screw hole, and one end protrudes into resonant rod after passing through cover board.By adjusting tuning screw under certain power
The length of resonant rod is protruded into adjust the frequency of filter.
With the fast development of microwave radio commu, wireless telecommunications it is universal, operator to the miniaturization of cavity body filter,
Lightweight demand is more more and more intense.
For above-mentioned existing cavity body filter since screw rod is thinner, it is shorter to go deep into active path in resonant rod, leads to frequency tune
Harmonic quantity is less than normal, since miniaturization resonant rod bore depth direction is limited, can not provide enough tuning paths.In addition, resonant rod
Groove internal diameter it is larger so that resonant rod disk is less than normal from cover board face capacitive coupling, cause resonance frequency higher, while resonant rod
Outer diameter is thicker, inductance it is smaller (Wherein, f0For resonance frequency, L is inductance, and C is capacitor), but also resonance frequency
Rate is also higher, and needs to increase filter height if reducing resonance frequency, in this way, will lead to the height of cavity body filter compared with
It is high.
Utility model content
One embodiment of the utility model provides a kind of cavity body filter, can be improved power capacity, increases tuning
Amount advantageously reduces the height of cavity body filter, and the cavity body filter includes:
A kind of cavity body filter, comprising:
The upper end of cavity, the cavity has opening；
Resonant rod, the resonant rod are placed in the cavity, and the resonant rod has the resonance towards the opening
Disk；
Cover board, the cover board covers the opening of the cavity, and the cover board is in the position of the correspondence resonance plate
The place of setting offers the through-hole being connected to the cavity；
Disk is tuned, the tuning disk is installed in the through-hole and has the adjusting on the axial direction of the through-hole
Freedom degree；
Wherein, the diameter of the tuning disk is less than the diameter of the resonance plate.
It optionally, further comprise shell-like component, the shell-like component is fixed on the cover board and connects with the through-hole
It is logical；Also, it is formed between the tuning disk and the shell-like component and being threadedly engaged for the adjusting freedom degree is provided.
Optionally, the shell-like component is embedded in the cover board and around the through-hole.
Optionally, the tuning disk has the self-locking mechanism with the screw-internal thread fit of the shell-like component, described from lock machine
Structure includes the first threaded portion and the second threaded portion being separated from each other, and first threaded portion and second threaded portion have and institute
State the matched external screw thread of internal screw thread of shell-like component, the axial mistake of the external screw thread of first threaded portion and second threaded portion
Position.
Optionally, first threaded portion and second threaded portion are arranged in described along the axis direction of the tuning disk
The outer peripheral surface of disk is tuned, and the outer peripheral surface of the tuning disk is formed between first threaded portion and second threaded portion
There is space.
Optionally, the resonance plate has the smooth surface towards the tuning disk.
Optionally, the resonance plate is equipped with columned groove in center towards the surface of the tuning disk, described
The diameter of groove is less than the diameter of the tuning disk.
Optionally, the diameter range of the groove is 1.5~2mm.
It optionally, further comprise supporting element, the supporting element is placed in the cavity, and the bar portion of the resonant rod is fixed
In the supporting element.
Optionally, the top end surface of the shell-like component is not less than the top surface of the cover board, the thickness of the shell-like component
Range is 2~3mm, and the thickness range of the tuning disk is 2~3mm, and the thickness range of the cover board is 1~3mm.
As above as it can be seen that being based on the above embodiments, the tuning screw of existing cavity body filter is replaced using tuning disk, by adjusting
Humorous disk matches forming face and face capacitive coupling with the resonance plate of resonant rod, in this way, increasing compared to existing tuning screw
The capacitive coupling face being tuned to increase frequency tuning amount, and can make magnetic distribution uniform, improve power and hold
Amount, in this manner it is possible to realize stronger capacitive load under spacing identical as conventional scheme, obtain lower resonance frequency, Jin Erke
To reduce the spacing between tuning disk and resonant rod, the whole height of cavity body filter is reduced.
Detailed description of the invention
Fig. 1 is the schematic diagram of internal structure of existing cavity body filter structure；
Fig. 2 is the cavity body filter schematic diagram of internal structure one of the utility model embodiment；
Fig. 3 is the cavity body filter schematic diagram of internal structure two of the utility model embodiment；
Fig. 4 is the shell-like modular construction schematic diagram of the utility model embodiment；
Fig. 5 is the tuning dish structure schematic diagram of the utility model embodiment.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, develop simultaneously implementation referring to the drawings
The utility model is further described in example.
Fig. 2 and Fig. 3 is respectively the cavity body filter inside configuration cross-sectional view one and two of an embodiment.Referring also to Fig. 2 and
Fig. 3, in one embodiment, cavity body filter includes:
The upper end of cavity 21, the cavity has opening.
Resonant rod 22, the resonant rod 22 are placed in the cavity 21, and the resonant rod 22 have towards described in open
The resonance plate 221 of mouth.
Cover board 23, the cover board 23 covers the opening of the cavity 21, and the cover board 23 is described humorous in correspondence
The through-hole being connected to the cavity 21 is offered at the position of vibration plate 221.
Disk 24 is tuned, the tuning disk 24 is installed in the through-hole and has on the axial direction of the through-hole
Freedom degree is adjusted, as tuned disk 24 in Fig. 2 and Fig. 3 shown in the different location on the through-hole axial direction.
Wherein, the diameter of the tuning disk 24 is less than the diameter of the resonance plate 221.
In above structure, the tuning screw of existing cavity body filter is replaced with into tuning disk, and makes the diameter for tuning disk
Less than the diameter of resonance plate, in this way, carrying out tuned filter by adjusting position of the tuning disk on cover plate through hole axial direction
Frequency when, tuning disk 24 do not need to extend into resonant rod 22, but utilize tuning disk and resonant rod resonance disk phase
The capacitive coupling cooperatively formed, to realize tuning.In this way, increasing the capacitor being tuned compared to existing tuning screw
Coupling surface to increase frequency tuning amount (still having larger tuning amount when tuning disk and being higher than cover board face), and can make
Magnetic distribution is uniform, improves power capacity, in this manner it is possible under spacing identical as conventional scheme, realize stronger capacitive load,
Lower resonance frequency is obtained, and then the whole height of cavity body filter can be reduced.In addition, passing through the capacitor of forming face and face
Coupling, can be to avoid the probability of tuning screw tip power disruption when being tuned in existing scheme.
When implementing above structure, it can be threadedly engaged by setting screw thread and tuning disk 24 in through-holes, general
Tuning disk 24 is installed in the through-hole, also be can use a special component and is installed in disk 24 is tuned in the through-hole, and is had
Body method is as follows:
Further, in above structure can also include shell-like component, the shell-like component be fixed on the cover board 23 and with
The through-hole connection；Also, it is formed between the tuning disk 24 and the shell-like component and the screw thread for adjusting freedom degree is provided
Cooperation.
Preferably, in order to further decrease the whole height of cavity body filter, the shell-like component can be embedded in cover board
In 23 and around the through-hole.Specifically, the shell-like component can be embedded in the cover board 23 by the way of pressing.
In practical applications, the shell-like component can be nut.Preferably, in order to exempt the secondary locking of tuning screw
Operation, to improve the efficiency of filter debugging, the shell-like component can be self-locking nut 25, as shown in figs. 2 to 4.
Correspondingly, as shown in figure 5, the tuning disk 24 will have with the screw-internal thread fit of the shell-like component from lock machine
Structure, the self-locking mechanism include the first threaded portion 241 and the second threaded portion 242 being separated from each other, first threaded portion 241 and institute
Stating the second threaded portion 242 has a matched external screw thread of internal screw thread with the shell-like component, and first threaded portion and described
The external screw thread axile displacement of second threaded portion, to realize self-locking function.
Preferably, first threaded portion 241 and second threaded portion 242 are along the tune in order to realize self-locking function
The axis direction of humorous disk 24 is arranged in the outer peripheral surface of the tuning disk 24, and the outer peripheral surface of the tuning disk 24 is described first
Space is formed between threaded portion 241 and second threaded portion 242.
Further, the tuning disk 24 falls off above the cover board in order to prevent, and the shell-like component, which has, to be used for
The limiting section for preventing the tuning disk 24 from falling off above the cover board.
Preferably, the resonance plate 221 has the smooth surface towards the tuning disk 24, in this way, can be utmostly
Ground expansion is used to form capacity coupled resonance disk.It should be noted that recessed due to not needing to be equipped in resonant rod 22 here
Therefore slot can farthest reduce the outer diameter of resonance plate lower pole, avoid higher resonance frequency, and then not need to lead to
Increase resonant rod height is crossed to reduce resonance frequency, so as to which the height of cavity body filter is effectively reduced.
Preferably, the surface of the resonance plate 221 towards the tuning disk 24 can be in center for the ease of assembly
Equipped with columned groove 222, the diameter of the groove 222 is less than the diameter of the tuning disk.
Preferably, 1.5~2mm can be set by the diameter range of the groove.In this way, the bar of resonant rod can be made
Portion's outer diameter is smaller, it is ensured that lower resonance frequency is obtained, so as to pass through the height for reducing resonant rod, to reach reduction cavity
The purpose of filter height.
Preferably, can further include the supporting element 26 for fixing resonant rod 22, supporting element 26 in above structure
It is placed in the cavity, the bar portion of the resonant rod 22 is fixed on the supporting element 26.Specifically, the supporting element can be convex
Platform.
Preferably, in order to further decrease the height of cavity body filter, can by reducing the thickness of the shell-like component,
The height of cavity body filter is reduced, for example, the thickness range of the shell-like component can be 2~3mm, the thickness of the tuning disk
Degree may range from 2~3mm, and the thickness range of the cover board can be 1~3mm, and the top end surface of the shell-like component is not low
In the top surface of the cover board.
Using the above structure, compared to existing cavity body filter, resonance frequency can be greatly lowered under same volume,
To reduce the whole height of cavity body filter, while there is biggish frequency tuning amount.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent substitution, improvement and etc. done should be included in the utility model
Within the scope of protection.
Claims (10)
1. a kind of cavity body filter characterized by comprising
The upper end of cavity, the cavity has opening；
Resonant rod, the resonant rod are placed in the cavity, and the resonant rod has the resonance plate towards the opening；
Cover board, the cover board covers the opening of the cavity, and the cover board is at the position of the correspondence resonance plate
Offer the through-hole being connected to the cavity；
Disk is tuned, the tuning disk is installed in the through-hole and has the adjusting on the axial direction of the through-hole free
Degree；
Wherein, the diameter of the tuning disk is less than the diameter of the resonance plate.
2. cavity body filter according to claim 1, which is characterized in that it further comprise shell-like component, the shell-like portion
Part is fixed on the cover board and is connected to the through-hole；Also, it is formed between the tuning disk and the shell-like component and institute is provided
It states and adjusts being threadedly engaged for freedom degree.
3. cavity body filter according to claim 2, which is characterized in that the shell-like component is embedded in the cover board simultaneously
Around the through-hole.
4. cavity body filter according to claim 2, which is characterized in that the tuning disk has and the shell-like component
The self-locking mechanism of screw-internal thread fit, the self-locking mechanism include the first threaded portion and the second threaded portion being separated from each other, and described
One threaded portion and second threaded portion have the matched external screw thread of internal screw thread with the shell-like component, first threaded portion
With the external screw thread axile displacement of second threaded portion.
5. cavity body filter according to claim 4, which is characterized in that first threaded portion and second threaded portion
The outer peripheral surface of the tuning disk is arranged in along the axis direction of the tuning disk, and the outer peripheral surface of the tuning disk is described the
Space is formed between one threaded portion and second threaded portion.
6. cavity body filter according to claim 1, which is characterized in that the resonance plate has towards the tuning disk
Smooth surface.
7. cavity body filter according to claim 1, which is characterized in that the resonance plate towards it is described tuning disk surface
It is equipped with columned groove in center, the diameter of the groove is less than the diameter of the tuning disk.
8. cavity body filter according to claim 7, which is characterized in that the diameter range of the groove is 1.5~2mm.
9. cavity body filter according to claim 1, which is characterized in that further comprise supporting element, the supporting element is set
In in the cavity, the bar portion of the resonant rod is fixed on the supporting element.
10. cavity body filter according to claim 2, which is characterized in that the top end surface of the shell-like component is not less than
The top surface of the cover board, the thickness range of the shell-like component are 2~3mm, and the thickness range of the tuning disk is 2~3mm, institute
The thickness range for stating cover board is 1~3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820987059.8U CN208548439U (en) | 2018-06-26 | 2018-06-26 | Cavity body filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820987059.8U CN208548439U (en) | 2018-06-26 | 2018-06-26 | Cavity body filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208548439U true CN208548439U (en) | 2019-02-26 |
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ID=65423431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820987059.8U Active CN208548439U (en) | 2018-06-26 | 2018-06-26 | Cavity body filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534854A (en) * | 2019-07-26 | 2019-12-03 | 苏州诺泰信通讯有限公司 | A kind of Novel Filter frequency reducing structure |
| CN111725594A (en) * | 2020-06-17 | 2020-09-29 | 大富科技(安徽)股份有限公司 | Cavity filter structure and base station filter |
-
2018
- 2018-06-26 CN CN201820987059.8U patent/CN208548439U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534854A (en) * | 2019-07-26 | 2019-12-03 | 苏州诺泰信通讯有限公司 | A kind of Novel Filter frequency reducing structure |
| CN111725594A (en) * | 2020-06-17 | 2020-09-29 | 大富科技(安徽)股份有限公司 | Cavity filter structure and base station filter |
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