CN209487675U - A kind of capacitive coupling structure for dielectric filter - Google Patents
A kind of capacitive coupling structure for dielectric filter Download PDFInfo
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- CN209487675U CN209487675U CN201821870631.9U CN201821870631U CN209487675U CN 209487675 U CN209487675 U CN 209487675U CN 201821870631 U CN201821870631 U CN 201821870631U CN 209487675 U CN209487675 U CN 209487675U
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Abstract
The utility model discloses a kind of capacitive coupling structures for dielectric filter, including dielectric filter ontology and set on two the first blind holes of dielectric filter body surface, each first blind hole and the medium filled around it form dielectric resonator, and each first blind hole is used to debug the resonance frequency of place dielectric resonator, second blind hole there are two being set between two dielectric resonators, two the second blind holes are respectively arranged on the upper and lower surfaces of dielectric filter ontology, and the axis of two the second blind holes coincides, the location of each second blind hole is connected with two dielectric resonators, two the second blind holes and the medium being filled between two blind holes constitute capacitive coupling structure, dielectric filter body surface, first blind hole surface and the second blind hole surface are coated with conductive layer.A kind of capacitive coupling structure for dielectric filter of the utility model realizes the control for distal end parasitic passband frequency while realizing capacitive coupling.
Description
Technical field
The utility model relates to a kind of capacitive coupling structures for dielectric filter.
Background technique
Modern Communication System is higher and higher to filter volume requirement, advantage of the dielectric filter in terms of performance and volume
It is more and more obvious.Currently, realize that the structure of capacitive coupling (or negative coupling) is complex in solid medium filter, technique
It realizes that difficulty is big, and the nearlyr frequency of passband is easy to cause to generate parasitic passband.
Utility model content
It is structurally reasonable the purpose of this utility model is to provide a kind of capacitive coupling structure for dielectric filter,
While realizing capacitive coupling, the control for distal end parasitic passband frequency is realized, to improve the suppression to parasitic passband
System.
To achieve the above object, the technical solution of the utility model is to design a kind of capacitive coupling for dielectric filter
Structure, including dielectric filter ontology and set on two the first blind holes of dielectric filter body surface, each described first
Blind hole and the medium filled around it form dielectric resonator, and each first blind hole is for dielectric resonator where debugging
Resonance frequency, set between two dielectric resonators there are two the second blind hole, which is respectively arranged on medium
The upper and lower surfaces of filtering body, and the axis of two second blind holes coincides, locating for each second blind hole
Position be connected with described two dielectric resonators, two second blind holes and the medium structure being filled between two blind holes
At capacitive coupling structure, the dielectric filter body surface, the first blind hole surface and the second blind hole surface are coated with conduction
Layer.
Preferably, the conductive layer is metallic silver.
Preferably, the dielectric resonator is ceramic dielectric resonator.
Preferably, the shape of first blind hole is round, ellipse or rectangle.
Preferably, the shape of second blind hole is round, ellipse or rectangle.
The working principle of the utility model are as follows: two the second blind holes constitute diplopore coupled structures, in principle the second blind hole with
The medium filled around it forms the structure for being similar to resonator, when its native resonant frequency f1 is lower than connected to it two
When the resonance frequency f0 of a dielectric resonator, in resonance frequency f0, input impedance imaginary part is negative value, so capacitive is presented,
Realize capacitive coupling (negative coupling).Simultaneously in the high-frequency parasitic resonance frequency of diplopore coupled structure, input impedance 0, phase
Even two dielectric resonators are fully on, form parasitic passband f2, and the frequency f2 of parasitic passband corresponds to diplopore coupled structure
High-frequency parasitic resonance frequency.
Since the high-frequency parasitic resonance frequency f2 of diplopore coupled structure is inversely proportional to hole depth, reach same intrinsic cavity frequency
Rate f1, it is more shallow than single hole coupling hole depth that diplopore couples each hole depth, therefore diplopore coupling couples height with higher compared with single hole
Frequency undesire frequency f2.
As resonance frequency f0 of the native resonant frequency f1 of diplopore coupled structure from two dielectric resonators connected to it
When remoter, input impedance imaginary part is bigger, therefore the coupling value that generates of the structure measures that smaller (admittance is inversely proportional to resistance with admittance
It is anti-), therefore adjust f1 and also have an impact to coupling value, coupling value depend on simultaneously diplopore coupled structure and two dielectric resonators it
Between distance, it is bigger apart from smaller coupling from electromagnetic theory, therefore appropriate simultaneously reduce itself and two dielectric resonators
Distance and reduce f1 coupling value coupling value can be maintained constant, thus realize f1's while realizing suitable coupling value
Control.Itself and two can be changed by changing simultaneously two the second blind holes or only changing the form parameter of one of them the second blind hole
Relative distance size between a dielectric resonator.
The utility model has the following beneficial effects: realizing while realizing capacitive coupling for distal end parasitic passband frequency
The control of rate, to improve the inhibition to parasitic passband.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of the utility model.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is further described.Implement below
Example is only used for clearly illustrating the technical solution of the utility model, and cannot be used as a limitation the protection model of limitation the utility model
It encloses.
The technical solution of the utility model specific implementation is:
As shown in Figure 1, a kind of capacitive coupling structure for dielectric filter, including dielectric filter ontology 1 and set
Two the first blind holes 2 in 1 surface of dielectric filter ontology, each first blind hole 2 are formed with the medium filled around it
Dielectric resonator 3, and each first blind hole 2 is used to debug the resonance frequency of place dielectric resonator 3, two media
Set between resonator 3 there are two the second blind hole 4, this two the second blind holes 4 be respectively arranged on dielectric filter ontology 1 upper surface and
Lower surface, and the axis of this two the second blind holes 4 coincides, the location of each described second blind hole 4 and described two Jie
Matter resonator 3 is connected, and two second blind holes 4 and the medium being filled between two blind holes 4 constitute capacitive coupling structure,
1 surface of dielectric filter ontology, 2 surface of the first blind hole and 4 surface of the second blind hole are coated with conductive layer.
Above-mentioned conductive layer is metallic silver.
Above-mentioned dielectric resonator 3 is ceramic dielectric resonator.
The shape of above-mentioned first blind hole 2 is round, ellipse or rectangle.
The shape of above-mentioned second blind hole 4 is round, ellipse or rectangle.
The working principle of the utility model are as follows: two the second blind holes 4 constitute diplopore coupled structure, the second blind hole 4 in principle
The structure for being similar to resonator is formed with the medium filled around it, when its native resonant frequency f1 is lower than connected to it
When the resonance frequency f0 of two dielectric resonators 3, in resonance frequency f0, input impedance imaginary part is negative value, is held so presenting
Property, realize capacitive coupling (negative coupling).Simultaneously diplopore coupled structure high-frequency parasitic resonance frequency, input impedance 0,
Two dielectric resonators 3 that are connected are fully on, form parasitic passband f2, and the frequency f2 of parasitic passband corresponds to diplopore coupled structure
High-frequency parasitic resonance frequency.
Since the high-frequency parasitic resonance frequency f2 of diplopore coupled structure is inversely proportional to hole depth, reach same intrinsic cavity frequency
Rate f1, it is more shallow than single hole coupling hole depth that diplopore couples each hole depth, therefore diplopore coupling couples height with higher compared with single hole
Frequency undesire frequency f2.
As resonance frequency f0 of the native resonant frequency f1 of diplopore coupled structure from two dielectric resonators 3 connected to it
When remoter, input impedance imaginary part is bigger, therefore the coupling value that generates of the structure measures that smaller (admittance is inversely proportional to resistance with admittance
It is anti-), therefore adjust f1 and also have an impact to coupling value, coupling value depends on diplopore coupled structure and two dielectric resonators 3 simultaneously
The distance between, it is bigger apart from smaller coupling from electromagnetic theory, therefore appropriate simultaneously reduce itself and two dielectric resonances
The distance and reduction f1 coupling value of device 3 can maintain coupling value constant, thus realize while realizing suitable coupling value
The control of f1.Can by change simultaneously two the second blind holes 4 or only change one of them the second blind hole 4 form parameter change
Its relative distance size between two dielectric resonators 3.
The utility model has the following beneficial effects: realizing while realizing capacitive coupling for distal end parasitic passband frequency
The control of rate, to improve the inhibition to parasitic passband.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change
It also should be regarded as the protection scope of the utility model into retouching.
Claims (1)
1. a kind of capacitive coupling structure for dielectric filter, which is characterized in that including dielectric filter ontology and be set to
Two the first blind holes of dielectric filter body surface, each first blind hole and the medium formation medium filled around it are humorous
Shake device, and each first blind hole is used to debug the resonance frequency of place dielectric resonator, two dielectric resonators it
Between set there are two the second blind hole, which is respectively arranged on the upper and lower surfaces of dielectric filter ontology, and should
The axis of two the second blind holes coincides, and the location of each described second blind hole is connected with described two dielectric resonators,
Two second blind holes and the medium being filled between two second blind holes constitute capacitive coupling structure, the dielectric filter
Device body surface, the first blind hole surface and the second blind hole surface are coated with conductive layer, and the conductive layer is metallic silver, are given an account of
Matter resonator is ceramic dielectric resonator, and the shape of first blind hole is round, oval or rectangle, second blind hole
Shape is round, ellipse or rectangle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821870631.9U CN209487675U (en) | 2018-11-14 | 2018-11-14 | A kind of capacitive coupling structure for dielectric filter |
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| CN201821870631.9U CN209487675U (en) | 2018-11-14 | 2018-11-14 | A kind of capacitive coupling structure for dielectric filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029781A (en) * | 2019-12-02 | 2020-04-17 | 成都雷电微力科技有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN111613858A (en) * | 2020-06-30 | 2020-09-01 | 瑞声精密制造科技(常州)有限公司 | Dielectric waveguide filter |
| CN113690560A (en) * | 2020-05-18 | 2021-11-23 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
-
2018
- 2018-11-14 CN CN201821870631.9U patent/CN209487675U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029781A (en) * | 2019-12-02 | 2020-04-17 | 成都雷电微力科技有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN111029781B (en) * | 2019-12-02 | 2022-03-29 | 成都雷电微力科技股份有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN113690560A (en) * | 2020-05-18 | 2021-11-23 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| CN111613858A (en) * | 2020-06-30 | 2020-09-01 | 瑞声精密制造科技(常州)有限公司 | Dielectric waveguide filter |
| WO2022000592A1 (en) * | 2020-06-30 | 2022-01-06 | 瑞声声学科技(深圳)有限公司 | Dielectric waveguide filter |
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