CN213845467U - Miniaturized metal cavity filter - Google Patents
Miniaturized metal cavity filter Download PDFInfo
- Publication number
- CN213845467U CN213845467U CN202022807513.7U CN202022807513U CN213845467U CN 213845467 U CN213845467 U CN 213845467U CN 202022807513 U CN202022807513 U CN 202022807513U CN 213845467 U CN213845467 U CN 213845467U
- Authority
- CN
- China
- Prior art keywords
- cover plate
- metal cavity
- tuning screw
- cavity filter
- axial hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model relates to a microwave filter technical field, more specifically relates to a miniaturized metal cavity filter. A miniaturized metal cavity filter comprising: the metal cavity is internally provided with a resonance column, and an axial hole is formed in the resonance column; the cover plate covers the metal cavity, a cover plate boss corresponding to the axial hole is arranged on the lower surface of the cover plate, threaded holes are formed in the cover plate and the cover plate boss, and at least one part of the cover plate boss extends into the axial hole; the tuning screw is arranged in an axial hole of the resonance column and is in threaded connection with the threaded hole in the cover plate boss, and a self-locking thread is arranged at one end of the tuning screw, which is connected with the cover plate boss. The utility model obtains a miniaturized metal cavity filter which has the functions of reducing the size of the filter and reducing the resonant frequency; the altitude mixture control scope of tuning screw is big, consequently the utility model discloses a miniaturized metal cavity filter's the range of falling frequency is big.
Description
Technical Field
The utility model relates to a microwave filter technical field, more specifically relates to a miniaturized metal cavity filter.
Background
The microwave filter is widely applied to a communication base station system and is mainly used for selecting communication signals and filtering clutter or interference signals outside the frequency of the communication signals. Because the cavity filter is very suitable for large-scale production and the cost is very low, the cavity filter is mostly adopted in the base station system. In the prior art, a cavity filter includes a cavity, a resonant rod, a cover plate and an adjusting screw arranged on the cover plate, and in order to reduce resonant frequency, a structure that a capacitor disc is loaded at the tail end of the resonant rod is usually used to increase capacitance and reduce frequency; or the frequency is reduced by increasing the size of a single cavity of the cavity.
In practical applications, with the increasing application of tiny base stations and the co-location among systems, how to put a plurality of devices or apparatuses in a limited volume becomes a major problem of the current systems. The microwave radio frequency filter is used as an essential important component of a system, and an important problem of how to effectively reduce the development of a volume filter of a cavity filter is also that the size of a single cavity and the diameter of a capacitor disc cannot be too large due to the influence of the structural size of the filter.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it is not enough to aim at overcoming above-mentioned prior art at least, provides a miniaturized metal cavity filter for solve the too big problem of filter volume that leads to for reducing resonant frequency and enlarge the diameter of single chamber size and electric capacity disc.
The utility model adopts the technical proposal that:
a miniaturized metal cavity filter comprising:
the metal cavity is internally provided with a resonance column, and an axial hole is formed in the resonance column;
the cover plate covers the metal cavity, a cover plate boss corresponding to the axial hole is arranged on the lower surface of the cover plate, threaded holes are formed in the cover plate and the cover plate boss, and at least one part of the cover plate boss extends into the axial hole;
the tuning screw is arranged in an axial hole of the resonance column and is in threaded connection with the threaded hole in the cover plate boss, and a self-locking thread is arranged at one end of the tuning screw, which is connected with the cover plate boss.
In this technical scheme, through extending to the axial of resonance post with apron boss part, play the effect that reduces resonant frequency. The tuning screw rod with the self-locking thread is matched with the threaded hole in the cover plate boss, the tuning screw rod can be well fixed after being installed in the cover plate boss, the debugging screw rod is not higher than the cover plate surface in a self-locking mode, the overall height of the metal cavity is reduced, meanwhile, the vertical adjustable range of the tuning screw rod is increased through the height of the cover plate boss, and therefore the frequency modulation amplitude is improved. The technical scheme obtains the miniaturized metal cavity filter with the functions of reducing the size of the filter and reducing the resonant frequency.
Preferably, the length of the tuning screw is greater than the height of the cover plate boss, the tuning screw is in an inverted T shape, the upper end of the tuning screw is provided with a self-locking thread, and the lower end of the tuning screw extends out of the lower surface of the cover plate boss and extends into the axial hole of the resonance column.
Preferably, the axial hole is located at an axial center of the resonant column.
Preferably, an insulating medium layer is sleeved at one end of the tuning screw rod, which extends into the axial hole of the resonance column. In the technical scheme, the lower end of the tuning screw rod is provided with the insulating medium layer, so that the frequency reduction effect can be achieved. The insulating medium layer is arranged on the protruding part of the inverted T shape and used for preventing the screw rod from being in direct contact with the vibration adjusting column.
Further preferably, a gap exists between the insulating medium layer and the inner surface of the resonance column. A gap exists between the insulating medium layer and the inner surface of the resonance column, so that the height of the tuning screw rod is convenient to adjust.
Still more preferably, the insulating medium layer is a heat shrink tube or an insulating material spray coating.
Preferably, the hole at the boss of the cover plate is a central through hole with threads arranged inside, and is used for fixing the tuning screw rod. In the technical scheme, the cover plate is communicated with the holes of the cover plate boss and is a central through hole provided with threads, and the cover plate boss extends into the axial hole of the resonance column, so that the frequency modulation amplitude is further improved. Because the upper end of the tuning screw rod is provided with the self-locking thread and can be screwed into the central hole of the lug boss of the cover plate, in practical application, the tuning screw rod can rotate downwards and upwards along the axial hole of the resonance column to further finely adjust the frequency, and the vertical rotation range of the tuning screw rod is the height of the lug boss of the cover plate.
Preferably, the resonant column becomes gradually wider from top to bottom.
Preferably, the resonant column is integrally formed with the metal cavity; or the resonance column is fixed at the bottom of the metal cavity through screw connection. Among this technical scheme, when resonance post and metal cavity integrated into one piece, the resonance post setting that from top to bottom widens gradually and set up makes in the course of working the mould more convenient. The resonant column can also be in a form of independent molding of a single part and then is fixedly installed at the bottom of the metal cavity, so that the operation process is more flexible.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model obtains a miniaturized metal cavity filter which has the functions of reducing the size of the filter and reducing the resonant frequency;
(2) the miniaturized metal cavity filter of the utility model can play the role of frequency reduction by arranging the insulating medium layer at the lower end of the tuning screw rod;
(3) the miniaturized metal cavity filter of the utility model can play the role of reducing the frequency by designing the lug boss on the cover plate;
(4) the utility model discloses a tuning screw's altitude mixture control scope is big among the miniaturized metal cavity filter, therefore the frequency modulation range of wave filter is big.
Drawings
Fig. 1 is a schematic cross-sectional view of the miniaturized metal cavity filter of this embodiment 1.
Fig. 2 is an exploded view of the miniaturized metal cavity filter of this embodiment 1.
Fig. 3 is an exploded view of the miniaturized metal cavity filter of this embodiment 1 from another angle.
Description of reference numerals: a metal chamber 100; a cover plate 200; a tuning screw 300; an insulating dielectric layer 400; a resonant column 500; a cover plate boss 600.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1-3, the miniaturized metal cavity filter of this embodiment 1 includes a metal cavity 100 and a cover plate 200 covering the metal cavity 100, wherein a resonant column 500 is disposed in the metal cavity 100, an axial hole is disposed in the resonant column 500, and the axial hole is located at an axial center of the resonant column 500; the lower surface of the cover plate 200 is provided with a cover plate boss 600 corresponding to the axial hole of the resonance column 500, a threaded hole is formed in the cover plate boss 600, and at least one part of the cover plate boss 600 extends into the axial hole of the resonance column 500; the axial hole of the resonance column 500 is internally provided with a tuning screw 300, the tuning screw 300 is in threaded connection with the threaded hole in the cover plate boss 600, and one end of the tuning screw 300 connected with the cover plate boss 600 is provided with a self-locking thread.
In the embodiment 1, the cover boss 600 partially extends into the axial hole of the resonant post 500, so as to reduce the resonant frequency. The tuning screw 300 with the self-locking thread is matched with the threaded hole in the cover plate boss 600, so that the tuning screw 300 can be well fixed after being installed on the cover plate 200 through thread engagement, and the debugging screw 300 is not higher than the cover plate surface through a self-locking mode, the overall height of the metal cavity 100 is reduced, and meanwhile, the vertical adjustable range of the tuning screw 300 is increased through the height of the cover plate boss 600, and the frequency modulation amplitude is increased. This embodiment 1 is a miniaturized metal cavity filter having both a function of reducing the size of the filter and a function of lowering the resonance frequency.
In this embodiment 1, the length of the tuning screw 300 is greater than the height of the cover plate boss 600, and the lower end of the tuning screw 300 extends out of the lower surface of the cover plate boss 600 and into the axial hole of the resonant column 500. Meanwhile, an insulating medium layer 400 is sleeved at one end of the tuning screw 300 extending into the axial hole of the resonant column 500, and the insulating medium layer 400 is a heat-shrinkable tube and can play a role in reducing the frequency. In this embodiment 1, the tuning screw 300 is in the shape of an inverted T, the self-locking thread is disposed at the upper end of the inverted T, and the insulating medium layer 400 is disposed at the protruding portion of the inverted T. A gap exists between the insulating medium layer 400 and the inner surface of the resonant column 500, so that the height of the tuning screw 300 can be conveniently adjusted.
The cover plate boss 600 is internally provided with a threaded central hole, and the frequency reduction amplitude is further improved due to the design that the cover plate boss 600 partially extends into the axial hole of the resonance column 500. In this embodiment 1, the tuning screw 300 is provided with a self-locking thread, which can be screwed into a threaded hole at the boss 600 of the cover plate to lock the cover plate 200. In practical applications, the tuning screw 300 can rotate up and down along the axial hole of the resonant column 500 to further fine-tune the frequency, and the up-and-down rotation range of the tuning screw 300 is the height of the cover plate boss 600.
The height of resonance post 500 is slightly less than the height of metal cavity 100, and in this embodiment 1, resonance post 500 and metal cavity 100 integrated into one piece, and resonance post 500 from top to bottom widen gradually, when resonance post 500 and metal cavity 100 integrated into one piece, the setting of down gradually widening on the resonance post 500 makes in the course of working the back mould more convenient.
Example 2
A miniaturized metal cavity filter comprises a metal cavity and a cover plate covering the metal cavity, wherein a resonant column is arranged in the metal cavity, an axial hole is formed in the resonant column, and the axial hole is located at the axial center of the resonant column; the lower surface of the cover plate is provided with a cover plate boss corresponding to the axial hole of the resonance column, a threaded hole is formed in the cover plate boss, and at least one part of the cover plate boss extends into the axial hole of the resonance column; and a tuning screw rod is arranged in the axial hole of the resonance column, the tuning screw rod is in threaded connection with a threaded hole in the cover plate boss, and a self-locking thread is arranged at one end of the tuning screw rod connected with the cover plate boss.
In the embodiment 2, the cover plate boss part extends into the axial hole of the resonance column, so that the function of reducing the resonance frequency is achieved. The tuning screw rod is matched with a threaded hole in the cover plate boss, so that the tuning screw rod can be well fixed through thread engagement after being installed in the cover plate boss, the debugging screw rod is not higher than the cover plate surface through a self-locking mode, the overall height of the metal cavity is reduced, meanwhile, the vertical adjustable range of the tuning screw rod is increased through the height of the cover plate boss, and the frequency modulation amplitude is improved. This embodiment 2 is a miniaturized metal cavity filter having both a function of reducing the size of the filter and a function of lowering the resonance frequency.
In this embodiment 2, the length of tuning screw is greater than the height of apron boss, and the tuning screw lower extreme extends to outside the apron boss lower surface, and stretches into the axial hole of resonance post. Meanwhile, an insulating medium layer is sleeved at one end, extending into the axial hole of the resonant column, of the tuning screw, the insulating medium layer is an insulating material spraying layer, and the spraying material is polytetrafluoroethylene PTFE and can play a role in secondary frequency reduction. In this embodiment 2, the tuning screw is in the shape of an inverted T, the self-locking thread is disposed at the upper end of the inverted T, and the insulating medium layer is disposed at the protruding portion of the inverted T. A gap exists between the insulating medium layer and the inner surface of the resonance column, so that the height of the tuning screw rod is convenient to adjust.
The cover plate boss is internally provided with a threaded center hole, the center hole on the cover plate is a center hole which can be in threaded connection with the tuning screw, and the thread in the center hole of the cover plate is the same as the inner diameter of the thread in the thread hole of the cover plate boss, so that in the embodiment 2, the tuning screw can pass through the threaded hole of the cover plate boss and be screwed into the center hole of the cover plate, the height adjusting range of the tuning screw is further enlarged, and the frequency reduction amplitude is further improved.
The height of resonance post is a little less than the height of metal cavity, and in this embodiment 2, the resonance post is the part of independent shaping, and the resonance post is fixed in metal cavity bottom through screwed connection, and the operation process has more the flexibility.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. A miniaturized metal cavity filter, comprising:
the metal cavity is internally provided with a resonance column, and an axial hole is formed in the resonance column;
the cover plate covers the metal cavity, a cover plate boss corresponding to the axial hole is arranged on the lower surface of the cover plate, threaded holes are formed in the cover plate and the cover plate boss, and at least one part of the cover plate boss extends into the axial hole;
the tuning screw is arranged in an axial hole of the resonance column and is in threaded connection with the threaded hole in the cover plate boss, and a self-locking thread is arranged at one end of the tuning screw, which is connected with the cover plate boss.
2. The miniaturized metal cavity filter of claim 1, wherein the tuning screw has a length greater than the height of the cover plate boss, the tuning screw has an inverted T-shape, and has an upper end provided with a self-locking thread and a lower end extending out of the lower surface of the cover plate boss and into the axial hole of the resonant column.
3. The miniaturized metal cavity filter of claim 1, wherein an end of the tuning screw extending into the axial hole of the resonant column is sleeved with an insulating medium layer.
4. A miniaturized metal cavity filter as claimed in claim 3, characterized in that said dielectric layer is spaced from the inner surface of said resonator rod.
5. The miniaturized metal cavity filter of claim 3, wherein the insulating medium layer is a heat shrink tube or a sprayed insulating material layer.
6. The miniaturized metal cavity filter of claim 1 wherein the hole at the boss of the cover plate is a threaded central through hole for securing the tuning screw.
7. The miniaturized metal cavity filter of claim 1 wherein the resonator posts are gradually wider from top to bottom.
8. The miniaturized metal cavity filter of claim 1 wherein the resonating posts are integrally formed with the metal cavity.
9. The miniaturized metal cavity filter of claim 1 wherein the resonating posts are fixed to the bottom of the metal cavity by screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022807513.7U CN213845467U (en) | 2020-11-27 | 2020-11-27 | Miniaturized metal cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022807513.7U CN213845467U (en) | 2020-11-27 | 2020-11-27 | Miniaturized metal cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213845467U true CN213845467U (en) | 2021-07-30 |
Family
ID=76994297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022807513.7U Active CN213845467U (en) | 2020-11-27 | 2020-11-27 | Miniaturized metal cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213845467U (en) |
-
2020
- 2020-11-27 CN CN202022807513.7U patent/CN213845467U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102025008B (en) | Dielectric filter, dielectric syntony pole installation structure and communication equipment | |
| EP3561948B1 (en) | Cavity resonator, filter and communication device | |
| CN201533009U (en) | Device for loading electric capacity of coaxial resonant cavity | |
| CN213845467U (en) | Miniaturized metal cavity filter | |
| CN104900952A (en) | Coupling structure of dual-mode medium resonator and metal resonator | |
| CN106159395A (en) | Cavity body filter, duplexer and radio frequency remote equipment | |
| CN204668441U (en) | The bimodulus dielectric resonant apparatus that frequency difference is adjustable | |
| CN101922495B (en) | Screw device and cavity filter using same | |
| CN108336460A (en) | A kind of microminiature 5G filters | |
| CN108493538B (en) | Cavity filter capable of adjusting coupling strength | |
| CN201946724U (en) | Medium filter, mounting structure of medium resonant pole and communication equipment | |
| CN207719375U (en) | A kind of cavity metal medium bar hybrid resonant structure and filter | |
| CN219286628U (en) | Metal filter | |
| CN101922493B (en) | Screw device and cavity filter using same | |
| CN105470617A (en) | Dual-mode resonator | |
| CN208939120U (en) | A kind of filter tuner structure | |
| CN201412426Y (en) | Screw device and chamber wave filter applying same | |
| CN205303633U (en) | Filter | |
| CN108987861A (en) | A kind of adjustable coaxial filter | |
| CN109786907B (en) | Capacitive coupling structure of cavity filter and cavity filter | |
| CN212571288U (en) | Filter | |
| CN208548439U (en) | Cavity body filter | |
| CN207852877U (en) | A kind of microminiature 5G filters | |
| CN209266540U (en) | A kind of resonant column, filter and communication equipment | |
| CN209389184U (en) | A kind of adjustable coaxial filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |