CN206742469U - A kind of medium interdigital filter - Google Patents
A kind of medium interdigital filter Download PDFInfo
- Publication number
- CN206742469U CN206742469U CN201720062210.2U CN201720062210U CN206742469U CN 206742469 U CN206742469 U CN 206742469U CN 201720062210 U CN201720062210 U CN 201720062210U CN 206742469 U CN206742469 U CN 206742469U
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- Prior art keywords
- medium
- interdigital filter
- accessory
- groove
- coaxial dielectric
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Abstract
The utility model provides a kind of medium interdigital filter, including at least two coaxial dielectric resonators, the coaxial dielectric resonator includes open circuit surface and closed circuit face, the open circuit surface and closed circuit face are symmetrical relative to a median plane, adjacent coaxial dielectric resonator it is in opposite direction, the adjacent side of adjacent coaxial dielectric resonator, which is provided with, shares groove, and the shared groove is symmetrical relative to the median plane.Medium interdigital filter provided by the utility model, can effectively increase coupling amount, have preferable distal end inhibition, while can also adjust coupling amount in real time according to the demand of bandwidth, reduce production cost, improve production efficiency.
Description
Technical field
Filter field is the utility model is related to, more particularly to a kind of medium interdigital filter.
Background technology
Dielectric filter is low-loss, high-k, frequency-temperature coefficient and the thermal expansion using medium ceramic material
Coefficient is small, can bear what the features such as high power designed and produced, by several elongated resonator longitudinal direction plural serial stages or parallel connection it is trapezoidal
Railway superstructures.It is characterized in that insertion loss is small, resistance to power is good, narrow bandwidth, is widely used in portable phone, automobile telephone, nothing
In the equipment such as line earphone, wireless microphone, radio station, wireless phone and integrated duplexer.With the hair of science and technology
Exhibition, to the performance of dielectric filter, also more and more higher, the coefficient of coup are the important performance indexes of wave filter, and the coefficient of coup is bigger,
It is better to represent the effect of coupling, represents that coupling amount is bigger, and bandwidth is also wider.
Traditional dielectric filter is technical scheme disclosed in the CN101179144A mainly used at present, such medium
The coefficient of coup of wave filter is relatively small, and coupling amount is also smaller, so as to cause narrower bandwidth, can not meet the need of actual wide bandwidth
Ask；And the effect that distal end suppresses is also bad, the requirement of actual use can not be met.
Therefore, how to improve the problem of dielectric filter has turned into achievement urgent need to resolve.
Utility model content
The purpose of this utility model is to provide a kind of medium interdigital filter and can provide have than traditional dielectric filter
There is the bigger coefficient of coup, so as to have bigger bandwidth, and the effect that distal end suppresses can be improved, while can be according to band
Wide different performance requirement, adjusts coupling amount, reduces production cost, improves efficiency.
A kind of medium interdigital filter, including at least two coaxial dielectric resonators, the coaxial dielectric resonator include
Open circuit surface and closed circuit face, the open circuit surface and closed circuit face are symmetrical relative to a median plane, the side of adjacent coaxial dielectric resonator
To on the contrary, the adjacent side of adjacent coaxial dielectric resonator, which is provided with, shares groove, the shared groove is relative to the center
Face is symmetrical.
Optionally, the medium interdigital filter also includes accessory and tuned cell, and the accessory is filled in the groove
Interior, the tuned cell is arranged on the accessory.
Optionally, the tuned cell is tuning screw, and the accessory is threadedly coupled with tuning screw.
Optionally, the groove is multiple to set accessory specification in each recess identical, be arranged on each accessory
Tuning screw specification it is identical.
Optionally, the accessory and the groove are of similar shape and volume.
Optionally, the accessory accessory is made of material of the dielectric constant less than 3.7.
Optionally, the tuning screw is in the center of the accessory.
Optionally, the outer surface of the medium interdigital filter has metal level.
Optionally, the metal level is silver layer.
Optionally, the medium interdigital filter both ends have an input and output electrode, input and output electrode phase each other
It is mutually symmetrical.
In medium interdigital filter provided by the utility model, conversely placed by two neighboring coaxial dielectric resonator,
And symmetrical groove is opened up in adjacent side, so as to increase the coefficient of coup, improve the effect that distal end suppresses, while by groove
Increase tuned cell, in that context it may be convenient to adjust coupling amount, reduce production cost.
Brief description of the drawings
Fig. 1 is the structure chart of medium interdigital filter provided by the utility model；
Fig. 2 is the HFSS of traditional dielectric filter analogous diagram；
Fig. 3 is the HFSS analogous diagrams of medium interdigital filter provided by the utility model；
Fig. 4 is the attenuation characteristic figure of traditional dielectric filter；
Fig. 5 is the attenuation characteristic figure of medium interdigital filter provided by the utility model.
Label in figure：The coaxial dielectric resonators of 1- first；The coaxial dielectric resonators of 2- second；The coaxial dielectric resonance of 3- the 3rd
Device；The tuning screws of 4- first；5- second tune screws；The grooves of 6- first；The grooves of 7- second；The accessories of 8- first；The accessories of 9- second；
10- median planes；The open circuit surface of the coaxial dielectric resonators of 11- first；The closed circuit face of 12- coaxial dielectric resonators；21- second is coaxial
The open circuit surface of dielectric resonator；The closed circuit face of the coaxial dielectric resonators of 22- second；The open circuit surface of the coaxial dielectric resonators of 31- the 3rd；
The closed circuit face of the coaxial dielectric resonators of 32- the 3rd.
Embodiment
Below in conjunction with the drawings and specific embodiments to the utility model proposes medium interdigital filter make further it is detailed
Explanation.According to following explanation and claims, advantages and features of the present utility model will become apparent from.It should be noted that accompanying drawing
Non- accurately ratio is used using very simplified form and, only to convenience, lucidly aid in illustrating the utility model
The purpose of embodiment.
The utility model provides a kind of medium interdigital filter, including at least two coaxial dielectric resonators, described coaxial
Dielectric resonator includes open circuit surface and closed circuit face, and the open circuit surface and closed circuit face are symmetrical relative to a median plane, and adjacent is coaxial
Dielectric resonator it is in opposite direction, the adjacent side of adjacent coaxial dielectric resonator is provided with shared groove, the groove phase
It is symmetrical for the median plane.
As shown in Fig. 2 the medium interdigital filter includes the first coaxial dielectric resonator 1, the second coaxial dielectric resonance
Device 2, the 3rd coaxial dielectric resonator 3, first coaxial dielectric resonator 1 includes open circuit surface 11 and closed circuit face 12, described to open
Road surface 11 and closed circuit face 12 are symmetrical relative to median plane 10, and second coaxial dielectric resonator 2 includes open circuit surface 21 and closed circuit
Face 22, the open circuit surface 21 and closed circuit face 22 are symmetrical relative to median plane 10, and the 3rd coaxial dielectric resonator 3 includes open circuit
Face 31 and closed circuit face 32, the open circuit surface 31 and closed circuit face 32 are symmetrical relative to median plane 10.
In opposite direction, i.e. the first coaxial dielectric of the coaxial dielectric resonator 2 of first coaxial dielectric resonator 1 and second
The open circuit surface 11 of resonator is adjacent with the closed circuit face 22 of the second coaxial dielectric resonator 2, the first coaxial dielectric resonator it is closed circuit
Face 12 is adjacent with the open circuit surface 21 of the second coaxial dielectric resonator 2；The coaxial dielectric of second coaxial dielectric resonator 2 and the 3rd
Resonator 3 it is in opposite direction, i.e., the coaxial dielectric resonator 3 of closed circuit face 22 and the 3rd of described second coaxial dielectric resonator 2
Open circuit surface 31 is adjacent, the phase of closed circuit face 32 of the coaxial dielectric resonator 3 of open circuit surface 21 and the 3rd of the second coaxial dielectric resonator 2
It is adjacent.
The centre position of the adjacent side of the coaxial dielectric resonator 2 of first coaxial dielectric resonator 1 and second is provided with
First groove 6, first groove 6 are symmetrical relative to the median plane 10；Second coaxial resonator 2 and the 3rd is coaxial humorous
The shake centre position of adjacent side of device 3 is provided with the second groove 7, and second groove 7 is symmetrical relative to median plane 1, and shown the
One groove 6 and the second groove 7 are same grooves.
The medium interdigital filter also includes the first accessory 8, the second accessory 9, the first tuning screw 4 and second tune spiral shell
Nail 5, first accessory 8 matches with the first groove 6, i.e., the first accessory 8 can be embedded just below in first groove 6,
The groove 7 of second accessory 9 and second matches, i.e., the second accessory 9 can be embedded just below in second groove 7, described
First accessory 8 and the second accessory 9 are all made up of the material of low dielectric constant, for example, it may be dielectric constant is less than 3.7 material
Matter, preferably it is made of polytetrafluoroethylene (PTFE), can also uses other materials such as polystyrene, paraffin etc., described first matches somebody with somebody
The accessory 9 of part 8 and second is the accessory of same specification.
First tuning screw 4 is connected by screw thread with accessory 8, and the tuning screw 5 is connected by screw thread and accessory 9
Connect, the tuning screw 4 and the screw that tuning screw 5 is same specification.
The tuning screw 4 is in the center of accessory 8, and the tuning screw 5 is in the center of accessory 9.
Metalized is done in the outer surface of described medium interdigital filter, forms metal covering, preferably plates last layer
The metal of the conductive energy of silver-colored or other metals such as aluminium, copper, gold etc., makes tuning screw be contacted with metal covering, reaches
To the purpose of ground connection.
The both ends of the medium interdigital filter have input and output electrode (not shown), the input and output electrode
The opposite face of side where groove, the electrode can both do input, can also do output end, and two input and output electricity
It is extremely symmetrical.
Tuned cell is by taking tuning screw as an example or other devices in the present embodiment, such as nut, bolt etc..
The beneficial effects of the utility model will be illustrated by experimental data below.It should be noted that the utility model
The medium interdigital filter and conventional filter provided is made up of same dielectric constant material, has identical size, in
Frequency of heart is all by taking 2GHz as an example.
Fig. 2 is HFSS (the high-frequency structure simulator high-frequency structures of traditional dielectric filter
Simulation program) analogous diagram, its abscissa represents the size (mm) of groove, and ordinate represents the coefficient of coup, and curve can be with from figure
Find out, coefficient of coup maximum can reach 0.038.
Fig. 3 is the HFSS analogous diagrams of medium interdigital filter provided by the utility model, and curve can be seen that from figure
Coefficient of coup maximum can reach 0.053, and the coefficient of coup increases 40% compared to traditional dielectric filter.
Fig. 4 is the attenuation characteristic figure of traditional dielectric filter, and Fig. 5 is medium interdigital filter provided by the utility model
Attenuation characteristic figure, wherein abscissa represent amplitude (dB), ordinate represent frequency (GHz), can by Fig. 4 and Fig. 5 contrast
To find out, Fig. 5's has preferably distal end suppression, i.e., medium interdigital filter provided by the utility model has preferably remote
Hold inhibition.
Medium interdigital filter provided by the utility model, can effectively increase coupling amount, have preferably distal end
Inhibition, while coupling amount can also be adjusted in real time according to the demand of bandwidth, production cost is reduced, improves production efficiency.
Embodiment provided by the utility model is by taking three coaxial dielectric resonators as an example, it is to be understood that includes three
The embodiment of individual above coaxial dielectric resonator is also within the scope of protection of the utility model.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the scope of the utility model
Calmly, any change, the modification that the those of ordinary skill in the utility model field does according to the disclosure above content, belonging to right will
Seek the protection domain of book.
Claims (10)
1. a kind of medium interdigital filter, it is characterised in that including at least two coaxial dielectric resonators, the coaxial dielectric is humorous
The device that shakes includes open circuit surface and closed circuit face, and the open circuit surface and closed circuit face are symmetrical relative to a median plane, and adjacent coaxial dielectric is humorous
Shake the in opposite direction of device, the adjacent side of adjacent coaxial dielectric resonator is provided with shared groove, and the groove is relative to institute
It is symmetrical to state median plane.
2. medium interdigital filter as claimed in claim 1, it is characterised in that the medium interdigital filter also includes accessory
And tuned cell, the accessory are filled in the groove, the tuned cell is arranged on the accessory.
3. medium interdigital filter as claimed in claim 2, it is characterised in that the tuned cell is tuning screw, described
Accessory is threadedly coupled with tuning screw.
4. medium interdigital filter as claimed in claim 2, it is characterised in that the groove is multiple, is arranged on each recessed
Accessory specification in groove is identical, and the tuning screw specification being arranged on each accessory is identical.
5. medium interdigital filter as claimed in claim 4, it is characterised in that the shape and body of the accessory and the groove
Product matches.
6. medium interdigital filter as claimed in claim 4, it is characterised in that the accessory is less than 3.7 using dielectric constant
Material be made.
7. medium interdigital filter as claimed in claim 4, it is characterised in that the tuning screw is at the center of the accessory
Position.
8. medium interdigital filter as claimed in claim 1, it is characterised in that the appearance mask of the medium interdigital filter
There is metal level.
9. medium interdigital filter as claimed in claim 8, it is characterised in that the metal level is silver layer.
10. medium interdigital filter as claimed in claim 1, it is characterised in that the medium interdigital filter both ends have
Input and output electrode, the input and output electrode are symmetrical each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062210.2U CN206742469U (en) | 2017-01-18 | 2017-01-18 | A kind of medium interdigital filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062210.2U CN206742469U (en) | 2017-01-18 | 2017-01-18 | A kind of medium interdigital filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206742469U true CN206742469U (en) | 2017-12-12 |
Family
ID=60556142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720062210.2U Expired - Fee Related CN206742469U (en) | 2017-01-18 | 2017-01-18 | A kind of medium interdigital filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206742469U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785262A (en) * | 2017-01-18 | 2017-05-31 | 苏州富电通讯有限公司 | A kind of medium interdigital filter |
| CN110459841A (en) * | 2019-08-14 | 2019-11-15 | 苏州波发特电子科技有限公司 | A kind of dielectric filter |
-
2017
- 2017-01-18 CN CN201720062210.2U patent/CN206742469U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785262A (en) * | 2017-01-18 | 2017-05-31 | 苏州富电通讯有限公司 | A kind of medium interdigital filter |
| CN110459841A (en) * | 2019-08-14 | 2019-11-15 | 苏州波发特电子科技有限公司 | A kind of dielectric filter |
| CN110459841B (en) * | 2019-08-14 | 2020-12-08 | 苏州波发特电子科技有限公司 | Dielectric filter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 215100 room C, block C of Cao Hu Science Park, West Jiaotang Road, 1 Kwun Tong Road, Xiangcheng economic and Technological Development Zone, Suzhou City, Jiangsu Patentee after: SUZHOU FUDIAN COMMUNICATION Co.,Ltd. Address before: 215129 Jiangsu city of Suzhou province high tech Zone No. 253 Hua Feng Lu Patentee before: SUZHOU FUDIAN COMMUNICATION Co.,Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171212 Termination date: 20220118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |