CN203386872U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
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- CN203386872U CN203386872U CN201320398224.3U CN201320398224U CN203386872U CN 203386872 U CN203386872 U CN 203386872U CN 201320398224 U CN201320398224 U CN 201320398224U CN 203386872 U CN203386872 U CN 203386872U
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- cavity
- connecting rod
- low pass
- dielectric
- cover plate
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Abstract
The utility model discloses a cavity filter comprising a cavity bottom part, a cavity side wall, a cavity which is formed by the cavity bottom part and the cavity side wall, a resonator which is arranged inside the cavity, an installation groove which is communicated with the cavity, a low pass assembly which is arranged inside the installation groove and a cover plate which covers the cavity and the installation groove. The resonator is connected with the low pass assembly. The cavity filter further comprises an adjusting assembly which is used for adjusting impedance of the low pass assembly. The adjusting assembly is arranged on the cover plate, on the bottom part of the cavity or on the side wall of the cavity. Compared with cavity filers in the prior art, when a connecting rod is relatively long, a screw rod of the adjusting assembly is screwed in so that push force is given to an insulation medium by the screw rod, the connecting rod is driven to bend and deform, and thus time delay instability and interference resonance caused by matching imbalance in the installation groove are effectively counteracted, debugging is simplified and time consumption of debugging and optimization is greatly shortened.
Description
Technical field
The utility model relates to a kind of cavity body filter.
Background technology
Microwave filter is widely used in the communications field as a kind of frequency selection device, in communication base station system, is mainly used in selecting signal of communication, clutter or interference signal that the filtering communication signal frequency is outer.It can be divided into microstrip filter, interdigital filter, coaxial cavity filter, waveguide filter, pectinate line cavity filter, helical cavity filter, small-sized lumped wave filter, Ceramic Dielectric Filter, SIR (Stepped Impedance resonator) filter, high temperature superconducting materia etc.Because coaxial cavity filter is applicable to large-scale production very much, and cost is also very cheap, therefore, mostly adopts coaxial cavity filter in base station system.
In order to meet the filtering requirements of cavity body filter, also be provided with low pass filter in the part cavity body filter, low pass filter allows that low frequency signal passes through.Typical low pass filter is a kind ofly useful signal is passed through and to suppress the electronic installation of unwanted frequency signal simultaneously, and in information processing, data transmit and suppress to disturb etc. and automatically control, in communication and other electronic system with extensively.For realizing this function, usually can realize this function in a low pass of connector one end series connection.
In the prior art, as shown in Figure 1, described cavity body filter comprises cavity 101, is located at described cavity 101 interior resonator 102, the mounting groove 103 be communicated with described cavity 101, is located at the interior low pass assembly of described mounting groove 103 and the cover plate 104 of the described cavity 101 of capping and described mounting groove 103, and described resonator 102 is connected with described low pass assembly; Described low pass assembly comprises low pass filter 105 and connecting rod 106, described low pass filter 105 1 ends are connected with described resonator 102, the other end is connected with described connecting rod 106, described connecting rod 106 is connected with the inner wire of connector on the sidewall that is installed on described cavity 101 away from an end of described low pass filter 102, to carry out the transmission of signal.
In the research and practice process to prior art, inventor of the present utility model finds, in above-mentioned prior art: due to mounting groove, the requirement on machining accuracy of low pass filter and connecting rod is higher, the size of part, the obvious effect of the slight errors such as linearity to the coupling of low pass assembly, particularly when the mounting groove inside connecting rod is longer, connecting rod is mounted in mounting groove and can makes connecting rod crooked uneven, cause the connecting rod impedance can not reach desirable value, can cause mounting groove and low pass filter, coupling imbalance between mounting groove and connecting rod, make delay data unstable, thereby make in mounting groove to produce and disturb resonance, finally cause cavity body filter in debug process, be difficult to reach desirable radio-frequency (RF) index, need solve above problem by changeing the optimization tap line, take out the end of a thread the optimization of filter is wasted time and energy but often change to optimize, just can't optimize even at all, be difficult to the output qualified products.
The utility model content
Because mismachining tolerance or other reasons cause coupling imbalance between mounting groove and low pass filter, mounting groove and connecting rod, delay data is unstable afterwards in order to solve in prior art for the utility model, and cause that in mounting groove, the defects such as resonance are disturbed in generation, a kind of cavity body filter is provided.
For realizing above-mentioned utility model purpose, the utility model by the following technical solutions:
A kind of cavity body filter, it is characterized in that: comprise cavity bottom, cavity wall, the cavity formed by described cavity bottom and cavity wall, be located at resonator, the mounting groove be communicated with described cavity in described cavity, be located at low pass assembly in described mounting groove and the cover plate of the described cavity of capping and described mounting groove, described resonator is connected with described low pass assembly, also comprise that described adjusting part is located on described cover plate, described cavity bottom or described cavity wall for regulating the adjusting part of described low pass assembly impedance.
Described low pass assembly comprises low pass filter and connecting rod, and described low pass filter one end is connected with described resonator, and the other end is connected with described connecting rod.
Described adjusting part comprises nut and the screw rod of being located on described cover plate, described cavity bottom or described cavity wall.
Described adjusting part also comprises dielectric, and described dielectric is cylindrical shape, in the side of this dielectric, is provided with a through hole, described connecting rod through described through hole and with this through hole interference fit.
Described screw rod one end penetrates described nut and cover plate successively, and to be provided with an end of through hole relative and establish with described dielectric.
Be provided with the tank be communicated with it on described mounting groove, the other end of described dielectric be installed in described tank and with this tank matched in clearance.
Distance between described dielectric and described tank bottom is less than the distance between described connecting rod and described mounting groove bottom.
Described adjusting part is located on the described cavity bottom relative with described connecting rod, and described connecting rod is arranged with dielectric on the position relative with described screw rod.
Described adjusting part is located on described cavity wall, described screw rod one end penetrates described nut and described cavity wall successively, and stretch between described cover plate and described connecting rod or between described cavity bottom and described connecting rod, to regulate distance between described connecting rod and described cover plate or the distance between described connecting rod and described cavity bottom.
Described screw rod is coniform, and the position that described connecting rod is relative with described screw rod is provided with dielectric.
A kind of cavity body filter of the utility model, with respect to prior art, at described cover plate, described cavity bottom or described cavity wall are provided with adjusting part, when connecting rod is longer, screw rod by the precession adjusting part, described screw rod is arrived to be sheathed on the dielectric of described connecting rod, at this moment described screw rod is given thrust of described dielectric or extruding force, drive described connecting rod by this thrust or extruding force and produce Bending Deformation, so that described connecting rod is to cover plate or the skew of cavity bottom direction, thereby it is unstable and disturb resonance effectively to offset in mounting groove the caused time delay of coupling imbalance, and then debugging is oversimplified, greatly shortened the consuming time of debugging optimization.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described.
Fig. 1 is a kind of cavity body filter schematic diagram in prior art;
Fig. 2 is mono-one kinds of cavity body filter schematic diagrames of the utility model embodiment;
Fig. 3 is mono-one kinds of cavity body filter partial schematic diagrams of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of the utility model protection.
Embodiment mono-
A kind of cavity body filter is provided, as shown in Figure 2, comprise cavity bottom, cavity wall, the cavity 201 formed by described cavity bottom and described cavity wall, be located at the resonator 202 in described cavity 201, the mounting groove 203 be communicated with described cavity 201, be located at the interior low pass assembly of described mounting groove 203 and the cover plate 204 of the described cavity 201 of capping and described mounting groove 203, described resonator 202 is connected with described low pass assembly, in order to signal is transferred to described resonator 202, be provided with a plurality of resonators 202 in the present embodiment in cavity, described low pass assembly with its hithermost resonator 202, be connected, so that signal is transferred to next resonator 202 from hithermost resonator 202, finally be transferred to output.Described cavity body filter also comprises for regulating the adjusting part of described low pass assembly impedance, described adjusting part is located on described cover plate 204, described cavity bottom or described cavity wall, because the error of described low pass assembly processing dimension will cause that the impedance of low pass assembly can not reach desirable value, to cause the coupling imbalance between low pass assembly and mounting groove, therefore, need the impedance of described low pass assembly be transferred to desirable value by adjusting part, so that cavity body filter reaches desirable radio-frequency (RF) index in debug process.
Cavity body filter according to the present embodiment, described low pass assembly comprises low pass filter 205 and connecting rod 206, described low pass filter 205 1 ends are connected with described resonator 202, the other end is connected with described connecting rod 206, be that signal transfers to described low pass filter 205 by described connecting rod 206, transfer to again the described resonator 202 of the most close described low pass filter 205, finally transfer to output; Preferably, described low pass filter 205 1 ends are connected with described resonator 202 by tap line 2010, with the signal by described low pass filter 205, transfer to described resonator 202, transfer to the resonator of the most close described low pass filter 205; Certainly in other embodiments, can carry out the transmission of signal by the mode of coupling.
Cavity body filter according to the present embodiment, described adjusting part comprises nut 208 and the screw rod 209 of being located on described cover plate 204, described cavity bottom or described cavity wall, preferably, described nut 208 is one-body molded with described cover plate, or pushes and be fixed on described cover plate by external force.
The first execution mode, described adjusting part is located on the described cover plate 204 relative with described connecting rod 206, described adjusting part also comprises dielectric 207, described dielectric 207 is cylindrical shape, be provided with a through hole in the side of this dielectric 207, be that described through hole is opened to the other end from an end of described dielectric 207 sides, described connecting rod 206 through described through hole and with this through hole interference fit, thereby can prevent that described dielectric 207 from rotating around described connecting rod 206, certainly, in other embodiments, also can be by described dielectric 207 and described connecting rod 206 integrated injection moldings, by being set, this dielectric 207 can prevent from being short-circuited between described connecting rod 206 and described cover plate 204 or described cavity bottom.
According to the cavity body filter of the present embodiment, described screw rod 209 1 ends penetrate described nut 208 and cover plate 204 successively, and to be provided with an end of through hole relative and establish with described dielectric 207.Because described connecting rod 206 mismachining tolerances can cause that described connecting rod 206 is longer, after described connecting rod 206 is mounted to described mounting groove, can cause described connecting rod 206 injustice that bends, to make the impedance of whole low pass assembly can not reach desirable value, finally cause the coupling imbalance between low pass assembly and mounting groove 203, therefore, can be by the described screw rod 209 of precession, after screw rod 209 reaches described dielectric 207, continue to screw in, will be to 207 1 downward thrusts of described dielectric, drive described connecting rod 206 toward pressing down concurrent living Bending Deformation by this thrust, thereby described connecting rod 206 is offset downward, to offset the coupling imbalance between low pass assembly and described mounting groove 203, make the delay data of cavity body filter stable, finally make the radio-frequency (RF) index of cavity body filter in debug process meet the demands.
Cavity body filter according to the present embodiment, be provided with the tank 2061 be communicated with described mounting groove 203 on described mounting groove 203, vertically toward the sidewall of described cavity 201, output described tank 2061 from the bottom of described mounting groove 203, the other end of described dielectric 207 be installed in described tank 2061 and with these tank 2061 matched in clearance, be that described dielectric 207 is located in described tank 2061 away from an end of described through hole, and the side of this dielectric 207 coordinates with the side clearance of this tank 2061, so that described dielectric 207 is carried out to axial location.
Cavity body filter according to the present embodiment, distance between described dielectric 207 and described tank 2061 bottoms is less than the distance between described connecting rod 206 and described mounting groove 203 bottoms, in the present embodiment, the thrust that is subject to screw rod 209 due to described connecting rod 206 constantly offsets downward, if will be short-circuited to described mounting groove 203 bottoms, therefore make the distance between described dielectric 207 and described tank 2061 bottoms be less than the distance between described connecting rod 206 and described mounting groove bottom, just can prevent that described connecting rod 206 from contacting with described mounting groove 203 bottoms.
Certainly, in other embodiments, also can, at the sheathed plastics gum cover of the outer peripheral face of whole connecting rod 206, also can prevent that described connecting rod 206 from contacting caused short circuit with described cover plate 204 or described mounting groove 203 bottoms.
The second execution mode, described adjusting part is located on the described cavity bottom relative with described connecting rod 206, described connecting rod 206 is arranged with dielectric on the position relative with described screw rod 209, the reason same with the first execution mode, sheathed dielectric is to contact with described cover plate 204 or described mounting groove 203 bottoms for fear of described connecting rod 206; In other embodiments, also can be at the sheathed plastics gum cover of the outer peripheral face of whole connecting rod 206.
A kind of cavity body filter of the utility model, with respect to prior art, be provided with adjusting part on the cover plate of relatively described connecting rod or cavity bottom, described adjusting part comprises screw rod and nut, cause that when connecting rod is longer because of mismachining tolerance described connecting rod is installed in described mounting groove the injustice that bends, particularly crooked when more to described cover plate or described cavity bottom direction at institute's connecting rod, screw rod by the precession adjusting part, screw rod is arrived to be sheathed on the dielectric of described connecting rod, at this moment described screw rod is given thrust of described dielectric, drive described connecting rod by this thrust and produce Bending Deformation, so that described connecting rod is to described cavity bottom or the skew of described cover plate direction, thereby it is unstable and disturb resonance effectively to offset in mounting groove the caused time delay of coupling imbalance, and then debugging is oversimplified, greatly shortened the consuming time of debugging optimization.
The third execution mode, described adjusting part is located on described cavity wall, described screw rod 209 1 ends penetrate described nut 208 and described cavity wall successively, and stretch between described cover plate 204 and described connecting rod 206 or between described cavity bottom and described connecting rod 206, to regulate distance between described connecting rod 206 and described cover plate 204 or the distance between described connecting rod 206 and described cavity bottom.
Cavity body filter according to the present embodiment, preferably, described screw rod 209 is coniform, in order to prevent described screw rod 209 and described cover plate 204 or described cavity bottom, is short-circuited, and at described connecting rod 206, on the position relative with described screw rod 209, is provided with dielectric 207.Preferably, the diameter of described screw rod 209 increases gradually from an end toward its other end, near the segment section diameter of the described screw rod 209 of diameter smallest end be less than between described connecting rod 206 and described cover plate 204 apart from or described connecting rod 206 and described cavity bottom between distance, so that described screw rod 209 can stretch between described cover plate 204 and described connecting rod 206 or between described cavity bottom and described connecting rod 206, along with screw rod 209 constantly screws in, the diameter of the screw rod 209 contacted with described connecting rod 206 increase to gradually be greater than between described connecting rod 206 and described cover plate 204 the distance or described connecting rod 206 and described cavity bottom between distance, described screw rod 209 will push described connecting rod 206, make the direction skew of described connecting rod 206 toward described cavity bottom or described cover plate 204.
A kind of cavity body filter of the utility model, with respect to prior art, be provided with adjusting part on the cavity wall of relatively described connecting rod, described adjusting part comprises screw rod and nut, described screw rod stretches between described cover plate and described connecting rod or between described cavity bottom and described connecting rod, cause that when connecting rod is longer because of mismachining tolerance described connecting rod is installed in described mounting groove the injustice that bends, particularly crooked when more to described cover plate or described cavity bottom direction at institute's connecting rod, screw rod by the precession adjusting part, along with the screw diameter of precession constantly increases, described screw rod will push described connecting rod, so that described connecting rod is to the direction skew of described cover plate or described cavity bottom, thereby it is unstable and disturb resonance effectively to offset in mounting groove the caused time delay of coupling imbalance, and then debugging is oversimplified, greatly shortened the consuming time of debugging optimization.
Cavity body filter according to the present embodiment, the sidewall of described cavity is provided with connector, described connector comprises outer conductor 2011 and is located at the inner wire 2012 in described outer conductor 2011, described connecting rod 206 is connected with described inner wire 2012 away from an end of described low pass filter 205, be that signal transfers to the end of described connecting rod 206 away from described low pass filter 205 from the inner wire of described inner wire 2012, described connecting rod 206 transfers to signal described low pass filter 205 again.
Cavity body filter according to the present embodiment, be inserted with tuning screw 2013 on the cover plate 204 relative with described resonator 202, by the described tuning screw 2013 of spinning in and out, to regulate the distance of described adjusting screw(rod) 2013 and described resonator 202, finally be adjusted to required radio-frequency (RF) index.
According to the cavity body filter of the present embodiment, described cavity body filter mainly contains tower amplifier, duplexer, mixer and power splitter.
Applied specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present utility model and core concept thereof; , for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model simultaneously.
Claims (10)
1. a cavity body filter, it is characterized in that: comprise cavity bottom, cavity wall, the cavity formed by described cavity bottom and cavity wall, be located at resonator, the mounting groove be communicated with described cavity in described cavity, be located at low pass assembly in described mounting groove and the cover plate of the described cavity of capping and described mounting groove, described resonator is connected with described low pass assembly, also comprise that described adjusting part is located on described cover plate, described cavity bottom or described cavity wall for regulating the adjusting part of described low pass assembly impedance.
2. cavity body filter according to claim 1, it is characterized in that: described low pass assembly comprises low pass filter and connecting rod, and described low pass filter one end is connected with described resonator, and the other end is connected with described connecting rod.
3. cavity body filter according to claim 2, it is characterized in that: described adjusting part comprises nut and the screw rod of being located on described cover plate, described cavity bottom or described cavity wall.
4. cavity body filter according to claim 3, it is characterized in that: described adjusting part also comprises dielectric, described dielectric is cylindrical shape, in the side of this dielectric, is provided with a through hole, described connecting rod through described through hole and with this through hole interference fit.
5. cavity body filter according to claim 4, it is characterized in that: described screw rod one end penetrates described nut and cover plate successively, and to be provided with an end of through hole relative and establish with described dielectric.
6. cavity body filter according to claim 4 is characterized in that: be provided with the tank be communicated with it on described mounting groove, the other end of described dielectric be installed in described tank and with this tank matched in clearance.
7. cavity body filter according to claim 6 is characterized in that: the distance between described dielectric and described tank bottom is less than the distance of described connecting rod between bottom described mounting groove.
8. cavity body filter according to claim 3, it is characterized in that: described adjusting part is located on the described cavity bottom relative with described connecting rod, and described connecting rod is arranged with dielectric on the position relative with described screw rod.
9. cavity body filter according to claim 3, it is characterized in that: described adjusting part is located on described cavity wall, described screw rod one end penetrates described nut and described cavity wall successively, and stretch between described cover plate and described connecting rod or between described cavity bottom and described connecting rod, to regulate distance between described connecting rod and described cover plate or the distance between described connecting rod and described cavity bottom.
10. cavity body filter according to claim 9, it is characterized in that: described screw rod is coniform, and the position that described connecting rod is relative with described screw rod is provided with dielectric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320398224.3U CN203386872U (en) | 2013-07-05 | 2013-07-05 | Cavity filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320398224.3U CN203386872U (en) | 2013-07-05 | 2013-07-05 | Cavity filter |
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| CN203386872U true CN203386872U (en) | 2014-01-08 |
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| CN201320398224.3U Expired - Lifetime CN203386872U (en) | 2013-07-05 | 2013-07-05 | Cavity filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123843A (en) * | 2017-06-20 | 2017-09-01 | 深圳市国人射频通信有限公司 | A kind of wave filter |
| WO2019232728A1 (en) * | 2018-06-06 | 2019-12-12 | 深圳市大富科技股份有限公司 | Signal filter apparatus and signal transceiver device |
| CN111987410A (en) * | 2020-08-26 | 2020-11-24 | 广东通宇通讯股份有限公司 | Modular AFU structure |
-
2013
- 2013-07-05 CN CN201320398224.3U patent/CN203386872U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123843A (en) * | 2017-06-20 | 2017-09-01 | 深圳市国人射频通信有限公司 | A kind of wave filter |
| WO2019232728A1 (en) * | 2018-06-06 | 2019-12-12 | 深圳市大富科技股份有限公司 | Signal filter apparatus and signal transceiver device |
| CN111987410A (en) * | 2020-08-26 | 2020-11-24 | 广东通宇通讯股份有限公司 | Modular AFU structure |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |