CN206259468U - A kind of tunable filter - Google Patents
A kind of tunable filter Download PDFInfo
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- CN206259468U CN206259468U CN201621212642.9U CN201621212642U CN206259468U CN 206259468 U CN206259468 U CN 206259468U CN 201621212642 U CN201621212642 U CN 201621212642U CN 206259468 U CN206259468 U CN 206259468U
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- tunable filter
- support
- activator
- flexure type
- tuning screw
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Abstract
The utility model embodiment provides a kind of tunable filter, is related to filter field, solves the problems, such as that the coupling assembly complexity in the prior art between tuning screw and servo motor causes tuning precision not high.The tunable filter includes cavity, the cavity is provided with cover plate, the cover plate has been connected through a screw thread tuning screw, the upper surface of the cover plate is provided with support, flexure type piezo-activator is connected with the support, the part that the tuning screw is located at outside the cavity is fixed and is arranged with driver plate, the piezoelectric patches of the flexure type piezo-activator and the periphery of the driver plate against.
Description
Technical field
The utility model is related to filter field, more particularly to a kind of tunable filter.
Background technology
Tunable filter is one of common equipment in microwave telecommunication system, be can be used for when before antenna in transmitters
Rear class filtering, and tunable filter is located at after antenna in receivers, can curb all of interference signal, and will be useful
Signal spectrum chosen from all frequency spectrums received by antenna.
Reference picture 1, tunable filter includes cavity 01, and cover plate 02 is set on cavity 01, and screwed hole, spiral shell are opened up on cover plate 02
Tuning screw 03 is installed in pit, resonant rod 04 is provided with the cavity 01, tuning screw 03 forms structure electricity with resonant rod 04
Hold, one end of adjusting screw 03 is connected with servo motor (not shown) by coupling assembly, and servo motor can drive
Threadingly hole axle, to cavity 01 is threaded in or out, is changed tuning screw 03 by adjusting the length of the screw-in cavity 01 of tuning screw 03
Become the frequency filtering of wave filter.
Tuning screw 03 is connected with servo motor by coupling assembly in the prior art, the mechanical structure of coupling assembly
More complicated, mutual cooperation has gap, causes tuning precision not high, and error easily occurs in the automatic tuning of tunable filter.
Utility model content
Embodiment of the present utility model provides a kind of tunable filter, solves tuning screw in the prior art and servo horse
Coupling assembly complexity between reaching causes tuning precision problem not high.
To reach above-mentioned purpose, embodiment of the present utility model is adopted the following technical scheme that：
First aspect, there is provided a kind of tunable filter, including cavity, is provided with cover plate on cavity, the cover plate passes through screw thread
Tuning screw is connected with, the part that tuning screw is located at outside cavity is fixed and is arranged with driver plate, and the upper surface of cover plate is provided with branch
Frame, the support is connected with flexure type piezo-activator, the piezoelectric patches of flexure type piezo-activator and the periphery of driver plate against.
Relative to prior art, the tuning screw in the tunable filter of the utility model embodiment is located at the portion outside cavity
Fixation is divided to be arranged with driver plate, the upper surface of cover plate sets support, and flexure type piezo-activator is connected with the support, by this
The piezoelectric patches of flexure type piezo-activator is leant with the periphery of driver plate, and tuning screw is driven by flexure type piezo-activator
Rotation, because flexure type piezo-activator directly leans with driver plate, does not connect back to gap, the control essence of tuning screw between the two
Degree is higher, this improves the tuning precision of tunable filter so that the automatic tuning of tunable filter is not easy mistake occur
Difference.
In the first mode in the cards, with reference in a first aspect, offer pilot hole on support, tuning screw it is upper
End is slidably matched with pilot hole, and tuning screw can be prevented stuck.
In second mode in the cards, with reference to any one mode in the cards of first aspect, adjustable filtering
Device also includes the first elastic component, and pretightning force can be provided to tuning screw by the first elastic component, reduces the factors such as vibrations, percussion and leads
Wave filter is caused the problem of the electrical performance indexes such as Insertion Loss, echo loss occur.
In the third mode in the cards, with reference to second mode in the cards of first aspect, above-mentioned
One elastic component is spring leaf, and the upper end of tuning screw is passed the top surface of support, and the edge of spring leaf is connected with the top surface of support,
And the middle part of spring leaf is pressurizeed downwards the upper end of tuning screw, so as to be embodied as that pretightning force is provided between tuning screw and cover plate.
In the 4th kind of mode in the cards, with reference to any one mode in the cards of first aspect, flexure type pressure
Electric actuator is connected by the second elastic component with rack elasticity, and second elastic component extrudes flexure type pressure near the direction of driver plate
Electric actuator, the second elastic component provides the pretightning force between flexure type piezo-activator and driver plate, prevents piezoelectric patches with driver plate
Periphery departs from.
In the 5th kind of mode in the cards, with reference to the 4th kind of mode in the cards of first aspect, above-mentioned
Two elastic components are spring leaf, and the two ends of the second elastic component be connecteds with support, flexure type piezo-activator respectively, spring leaf with prop up
Frame, flexure type piezo-activator connection installation operation it is simple, can be to provide reliable between flexure type piezo-activator and driver plate
Pretightning force.
In the 6th kind of mode in the cards, with reference to any one mode in the cards of first aspect, above-mentioned bending
The piezoelectric patches of type piezo-activator is two, and two piezoelectric patches alternately stir driver plate rotation, improve the rotary speed of tuning screw.
In the 7th kind of mode in the cards, with reference to second mode in the cards of first aspect, above-mentioned
One elastic component is spring, by spring housing on the tuning screw, and spring two ends respectively with support, driver plate against the first bullet
Property part and tuning screw install simple, and be embodied as between tuning screw and cover plate providing the simple structure of pretightning force, both it
Between pretightning force reliability.
In the 8th kind of mode in the cards, with reference to first aspect the first to any in the cards in the 7th kind
Mode, support includes supporting plate, and the lower end of supporting plate is connected with cover plate, and the upper end of supporting plate is connected with top board, and pilot hole is located at
On top board, driver plate is located between top board and cover plate, and flexure type piezo-activator is relative with driver plate position.
In the 9th kind of mode in the cards, may be realized with reference to the 5th kind of first aspect or the 6th kind or the 8th kind
Mode, flexure type piezo-activator also include base, piezoelectric patches is fixed on base, the second elastic component is connected with base.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, embodiment or prior art will be retouched below
The accompanying drawing to be used needed for stating is briefly described, it should be apparent that, drawings in the following description are only the utility model
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structural representation of tunable filter in the prior art；
The structural representation of the tunable filter that Fig. 2 is provided for the utility model embodiment；
Piezoelectric patches drives the schematic diagram that driver plate is rotated in the tunable filter that Fig. 3 is provided for the utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
Reference picture 2~3, the tunable filter of the utility model embodiment includes cavity 1, and cover plate 2 is provided with cavity 1,
Tuning screw 3 is connected through a screw thread in the upper surface of cover plate 2, the part being located at outside cavity 1 in tuning screw 3 is fixed to be arranged and dialled
Disk 4, and support 5 is set on cover plate 2, flexure type piezo-activator 6 is connected on support 5, by flexure type piezo-activator 6
The periphery of piezoelectric patches 61 and driver plate 4 against, wherein, the arrow in Fig. 3 in driver plate 4 is the direction of rotation of driver plate 4, piezoelectric patches 61
The arrow on side is the bending direction of piezoelectric patches.
Relative to prior art, the tuning screw 3 in the tunable filter of the utility model embodiment is located at outside cavity 1
Part fixation is arranged with driver plate 4, and the upper surface of cover plate 2 sets support 5, and flexure type piezo-activator is connected on the support 5
6, the piezoelectric patches 61 of the flexure type piezo-activator 6 and the periphery of driver plate 4 are leant, by flexure type piezo-activator 6
Drive tuning screw 3 to rotate, because flexure type piezo-activator 6 directly leans with driver plate 4, gap do not connected back between the two,
The control accuracy of tuning screw is higher, this improves the tuning precision of tunable filter so that the automatic tune of tunable filter
It is humorous to be not easy error occur.
Specifically, the utility model embodiment is connected flexure type piezo-activator 6 with the controller of tunable filter
Connect, it is not necessary to which resonance is matched, actuating speed and driving force can just only be adjusted by software control flexure type piezo-activator 6,
It is easy to extensive, High Density Integration, can be realized on high-frequency band filter, and can realizes being adjusted while bandwidth and frequency
Section.
If the upper end freedom of tuning screw 3, when flexure type piezo-activator 6 drives tuning screw 3 to rotate, the side of driving force
To somewhat there is deviation, then it is stuck to be easily caused tuning screw, therefore, one embodiment of the present utility model is opened up on support 5
Pilot hole (not shown), the upper end of tuning screw 3 and pilot hole are slidably matched so that tuning screw 3 can be along pilot hole
Mobile, tuning screw is difficult stuck.
It is connected through a screw thread in view of tuning screw 3 and cavity 1, between the two without pretightning force, is received in tunable filter
When vibrations or percussion, tuning screw 3 easily axially movable, causes wave filter the electrical performance indexes such as Insertion Loss, echo occur and damages
Lose, wave filter adjusts the poor problem of repeatability, therefore, one embodiment of the present utility model also includes the first elastic component 7, leads to
Crossing the first elastic component 7 can provide pretightning force to tuning screw 3, improve the anti-percussion ability of tunable filter, reduce wave filter
Electrical performance indexes occur loss possibility.
The first above-mentioned elastic component 7 can be using spring leaf, spring etc., alternatively, in one embodiment of the present utility model
First elastic component 7 is spring leaf, and the upper end of tuning screw 3 is passed the top surface of support 5, the edge of spring leaf and the top of support 5
Face is connected, and the middle part of spring leaf is pressurizeed downwards the upper end of tuning screw 3, as shown in Figure 2.When tuning screw 3 is adjusted, spring
Piece pushes down tuning screw 3 down all the time, tuning screw 3 is kept certain pretightning force with support 5 all the time, if tunable filter goes out
Now vibrations or when the problems such as by clashing into, make tuning screw 3 movement tendency vertically occur, because the first elastic component 7 pairs is tuned
The pressure of screw 3 so that tuning screw 3 is maintained at setting position, this improves the anti-percussion ability of tunable filter, can
Prevent from wave filter from occurring electrical performance indexes because being clashed into or shaking to lose.
Alternatively, first elastic component 7 is spring in another embodiment of the present utility model, by spring housing located at tuning spiral shell
Nail 3 on, and spring two ends respectively with support 5, driver plate 4 against, when rotary tuning screw 3 towards away from cavity 1 direction motion
When, driver plate 4 by spring compression on support 5 so as to provide pretightning force, the first elastic component 7 between tuning screw 3 and cover plate 2
It is directly sleeved on tuning screw 3, installation operation is simple, is the pretightning force reliability provided between tuning screw 3 and cover plate 2.
When wave filter is given a shock or taps, the piezoelectric patches 61 of flexure type piezo-activator 6 and the circle of driver plate 4 may be made
Side face departs from, and causes flexure type piezo-activator 6 to fail, it is impossible to drive tuning screw to rotate, therefore, in the utility model one
Individual embodiment by flexure type piezo-activator 6 and support 5 by the elastic connection of the second elastic component 8, to close dial by the second elastic component 8
The direction of disk 4 extrudes flexure type piezo-activator 6, when running into vibrations or tapping, the piezoelectric patches 61 of flexure type piezo-activator 6
Occur towards the direction movement tendency away from driver plate 4, effect of second elastic component 8 to the piezoelectric patches 61 of flexure type piezo-activator 6
Power makes the piezoelectric patches 61 of flexure type piezo-activator and driver plate 4 be maintained at abutment condition, so as to prevent flexure type piezo-activator
Failure, it is impossible to the problem for driving tuning screw to rotate.
The second above-mentioned elastic component 8 can be using structures such as spring leaf, springs, in the utility model an optional embodiment
Second elastic component 8 uses spring leaf, and one end of the second elastic component 8 is connected with support 5, the other end and flexure type piezo-activator
6 connections, as shown in Fig. 2 spring leaf is cheap, and spring leaf 6 device piezoelectric actuated with support 5, flexure type is by screw
Can connect, installation operation is simple.
In order to improve the movement velocity of tuning screw, the piezoelectric patches 61 in above-mentioned flexure type piezo-activator 6 can be multiple,
Piezoelectric patches 61 is two for being arranged side by side in one embodiment of the present utility model, and two piezoelectric patches 61 are alternately stirred driver plate 4 and revolved
Turn, so as to improve the rotary speed of tuning screw, and then accelerate the tuned speed of tunable filter.Additionally, the piezoelectric patches
Made using piezoceramic material.
Specifically, the utility model embodiment medium-height trestle 5 includes supporting plate 51, and the lower end of supporting plate 51 is connected with cover plate 2,
The upper end of supporting plate 51 is connected with top board 52, and pilot hole is located on top board 52, and driver plate 4 is located between top board 52 and cover plate 2, bending
Type piezo-activator 6 is relative with the position of driver plate 4.
Above-mentioned supporting plate 51 can use one or two, if supporting plate 51 is one, supporting plate 51 is in top board 52
90 °, i.e. support 5 can use L-shaped, as shown in Fig. 2 or supporting plate 51 also can be in other angles of non-90 degree with top board 52；If support
Plate 51 is two, then two supporting plates 51, top board 52 and cover plates 2 can form the accommodating chamber for accommodating driver plate 4, and flexure type piezoelectricity is caused
Dynamic device 6 is also disposed in the accommodating chamber.Support 5 in the utility model embodiment uses L-shaped, and also cost is relatively low for convenient making.
Additionally, flexure type piezo-activator 6 also includes base 62 in the utility model embodiment, piezoelectric patches 61 is fixed on
On base 62, the second elastic component 8 is connected with base 62.Global design scheme small volume in the utility model embodiment, can
In the spatially realization of 10mm*20mm*15mm, facilitate the Miniaturization Design of tunable filter.
Finally it should be noted that：Above example is only used to illustrate the technical solution of the utility model, rather than its limitations；
Although being described in detail to the utility model with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from each embodiment technology of the utility model
The spirit and scope of scheme.
Claims (10)
1. a kind of tunable filter, including cavity, the cavity is provided with cover plate, and the cover plate has been connected through a screw thread tuning spiral shell
Nail, it is characterised in that the upper surface of the cover plate is provided with support, and flexure type piezo-activator is connected with the support, described
The part that tuning screw is located at outside the cavity is fixed and is arranged with driver plate, the piezoelectric patches of the flexure type piezo-activator with it is described
The periphery of driver plate against.
2. tunable filter according to claim 1, it is characterised in that pilot hole, the tune are offered on the support
The upper end of humorous screw is slidably matched with the pilot hole.
3. tunable filter according to claim 1 and 2, it is characterised in that also including the first elastic component, first bullet
Property part can to the tuning screw provide pretightning force.
4. tunable filter according to claim 3, it is characterised in that the upper end of the tuning screw passes the support
Top surface, first elastic component is spring leaf, and the edge of the spring leaf is connected with the top surface of the support, the spring leaf
Middle part be pressed down against the upper end of the tuning screw.
5. tunable filter according to claim 1, it is characterised in that the flexure type piezo-activator and the support
By the second elastic component elastic connection, second elastic component extrudes the flexure type piezoelectricity cause near the direction of the driver plate
Dynamic device.
6. tunable filter according to claim 5, it is characterised in that second elastic component is spring leaf, described the
One end of two elastic components is connected with the support, and the other end is connected with the flexure type piezo-activator.
7. tunable filter according to claim 1, it is characterised in that the piezoelectric patches is two for being arranged side by side.
8. tunable filter according to claim 3, it is characterised in that first elastic component is spring, the spring
Be sheathed on the tuning screw, one end of the spring and the support against, the other end and the driver plate against.
9. tunable filter according to claim 2, it is characterised in that the support includes supporting plate, the supporting plate
Lower end be connected with the cover plate, the upper end of the supporting plate is connected with top board, and the pilot hole is located on the top board, described
Driver plate is located between the top board and the cover plate, and the flexure type piezo-activator is relative with the driver plate position.
10. tunable filter according to claim 6, it is characterised in that the flexure type piezo-activator also includes bottom
Seat, the piezoelectric patches is fixed on the base, and second elastic component is connected with the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621212642.9U CN206259468U (en) | 2016-11-10 | 2016-11-10 | A kind of tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621212642.9U CN206259468U (en) | 2016-11-10 | 2016-11-10 | A kind of tunable filter |
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| Publication Number | Publication Date |
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| CN206259468U true CN206259468U (en) | 2017-06-16 |
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ID=59024879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621212642.9U Active CN206259468U (en) | 2016-11-10 | 2016-11-10 | A kind of tunable filter |
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| CN (1) | CN206259468U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109219227A (en) * | 2018-11-01 | 2019-01-15 | 中国科学院近代物理研究所 | Tuner and Superconducting cavity LINAC with it |
| CN113410591A (en) * | 2021-06-03 | 2021-09-17 | 昆山立讯射频科技有限公司 | Radio frequency device |
-
2016
- 2016-11-10 CN CN201621212642.9U patent/CN206259468U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109219227A (en) * | 2018-11-01 | 2019-01-15 | 中国科学院近代物理研究所 | Tuner and Superconducting cavity LINAC with it |
| CN109219227B (en) * | 2018-11-01 | 2021-07-27 | 中国科学院近代物理研究所 | Tuning device and superconducting accelerating cavity with same |
| CN113410591A (en) * | 2021-06-03 | 2021-09-17 | 昆山立讯射频科技有限公司 | Radio frequency device |
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