CN111106419A - Dielectric filter - Google Patents
Dielectric filter Download PDFInfo
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- CN111106419A CN111106419A CN202010014726.6A CN202010014726A CN111106419A CN 111106419 A CN111106419 A CN 111106419A CN 202010014726 A CN202010014726 A CN 202010014726A CN 111106419 A CN111106419 A CN 111106419A
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- Prior art keywords
- dielectric
- capacitive coupling
- dielectric filter
- coupling hole
- filter
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- 230000008878 coupling Effects 0.000 claims abstract description 111
- 238000010168 coupling process Methods 0.000 claims abstract description 111
- 238000005859 coupling reaction Methods 0.000 claims abstract description 111
- 238000002955 isolation Methods 0.000 claims description 15
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 4
- 238000010923 batch production Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
The invention is suitable for the technical field of communication, and provides a dielectric filter which comprises a dielectric main body, wherein at least two dielectric resonators are arranged on the dielectric main body, each dielectric resonator comprises at least one tuning blind hole for adjusting resonant frequency, the tuning blind holes are arranged on the upper surface of the dielectric main body, two adjacent resonators are selected, a coupling connecting bridge of the two adjacent resonators is arranged in the dielectric main body and penetrates through two capacitive coupling holes communicated with each other, one capacitive coupling hole extends towards the inside of the dielectric main body from the upper surface or the lower surface of the dielectric main body, and the other capacitive coupling hole extends inwards from the side wall of the dielectric main body. Therefore, the coupling form of the coupling connection bridge is capacitive coupling, and the mode for realizing the capacitive coupling has the characteristics of simple adjustment mode and convenience in processing, and is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a dielectric filter.
Background
The development speed of modern communication technology is faster and faster, and with the continuous development of multi-frequency systems, the requirements on the frequency selection characteristic and the out-of-band rejection characteristic of the filter are higher and higher. The introduction of capacitive coupling is an important method for improving the frequency selection characteristic and the out-of-band rejection characteristic of the filter, and the most common method for realizing the capacitive coupling is to introduce a metal coupling probe. For dielectric waveguide filters, the introduction of coupling probes is difficult.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a dielectric filter, in which two capacitive coupling holes penetrating and communicating with each other inside a dielectric body are formed on a coupling bridge between two adjacent dielectric resonators, so that the coupling form of the coupling bridge is capacitive coupling, and the dielectric filter has the characteristics of simple implementation and easy and convenient debugging.
In order to achieve the above object, the present invention provides a dielectric filter, which includes a dielectric body, at least two dielectric resonators are disposed on the dielectric body, each dielectric resonator includes at least one tuning blind hole for adjusting a resonant frequency, the tuning blind hole is opened on an upper surface of the dielectric body, a coupling bridge is disposed between two adjacent dielectric resonators, the coupling bridge is provided with two capacitive coupling holes penetrating and communicating inside the dielectric body, one of the capacitive coupling holes extends from the upper surface or the lower surface of the dielectric body to the inside of the dielectric body, and the other capacitive coupling hole extends from a sidewall of the dielectric body to the inside.
According to the dielectric filter of the present invention, the cross section of the capacitive coupling hole is circular or square.
According to the dielectric filter, the aperture of the capacitive coupling hole is gradually reduced or reduced in a step manner from outside to inside.
According to the dielectric filter of the present invention, two capacitive coupling holes extend and cross each other to form an "L" shape, a "ten" shape, or a "T" shape.
According to the dielectric filter of the present invention, the dielectric body is formed of a ceramic material.
According to the dielectric filter of the present invention, the surface of the dielectric body and the inner surface of the capacitive coupling hole are covered with the metal plating layer.
According to the dielectric filter, the non-plating area is arranged in the capacitive coupling hole.
According to the dielectric filter of the present invention, the dielectric filter is provided with the isolation window for dividing the dielectric filter into the plurality of individual dielectric resonators, the isolation window penetrating the upper surface and the lower surface of the dielectric filter.
According to the dielectric filter of the present invention, the isolation window has an "I" shape, an "L" shape, a "T" shape, or a "ten" shape.
According to the dielectric filter of the present invention, the dielectric filter is partitioned by the isolation window to form six resonance units.
The two capacitive coupling holes which are communicated with each other in a penetrating way are arranged on the coupling connection bridge between two adjacent dielectric resonators on the dielectric filter, wherein one capacitive coupling hole extends from the upper surface or the lower surface of the dielectric body to the inside of the dielectric body, and the other capacitive coupling hole extends inwards from the side wall of the dielectric body, so that the coupling form of the coupling connection bridge is capacitive coupling. The invention can obtain capacitive coupling only by simply adjusting the coupling window structure formed by the conventional coupling connection bridge, thereby realizing the required frequency characteristic of the filter. The mode for realizing capacitive coupling provided by the invention has the characteristics of simple adjustment mode and convenience in processing, and is suitable for batch production.
Drawings
FIG. 1 is a perspective view of one embodiment of a dielectric filter of the present invention;
FIG. 2 is a perspective view of the dielectric filter of FIG. 1;
FIG. 3 is a cross-sectional view of a portion A-A of the dielectric filter of FIG. 1;
figure 4 is a cross-sectional view of another embodiment of a dielectric filter of the present invention;
figure 5 is a cross-sectional view of another embodiment of a dielectric filter of the present invention;
figure 6 is a cross-sectional view of another embodiment of a dielectric filter of the present invention;
figure 7 is a cross-sectional view of yet another embodiment of a dielectric filter of the present invention;
fig. 8 is a graph of the frequency response of the dielectric filter of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, a dielectric filter 100 according to an embodiment of the present invention includes a dielectric body 10, where at least two dielectric resonators 20 are disposed on the dielectric body 10, and six dielectric resonators are disposed on the dielectric body 10 as an example in the embodiment of the present invention. Each dielectric resonator 20 comprises at least one tuning blind hole 21 for adjusting the resonance frequency, the tuning blind hole 21 opening onto the upper surface 11 of the dielectric body 10. The coupling bridge 30 is provided between two adjacent dielectric resonators 20, and the coupling bridge 30 is provided with a first capacitive coupling hole 22 and a second capacitive coupling hole 23 which are communicated through the inside of the dielectric body 10. Wherein the first capacitive coupling hole 22 extends from the upper surface 11 or the lower surface 12 of the dielectric body 10 towards the inside of the dielectric body 10 and the second capacitive coupling hole 23 extends from the sidewall 13 of the dielectric body 10 inwards. The first and second capacitive coupling holes 22 and 23 are formed by blind holes penetrating each other, and the first and second capacitive coupling holes 22 and 23 are only communicated with each other, and do not penetrate the dielectric body 10. Thereby, the coupling form of the coupling bridge 30 is capacitive coupling, and the frequency response characteristic of the dielectric filter 100 is realized, as shown in fig. 8. And has the characteristics of simple implementation mode and simple and convenient debugging.
As shown in fig. 1, the dielectric filter 100 is provided with a dielectric isolation window 16 for dividing the dielectric filter 100 into six individual dielectric resonators 20, the dielectric isolation window 16 penetrating the upper surface 11 and the lower surface 12 of the dielectric filter 100. The isolation window 16 separates the six tuning blind holes 21, thereby forming a single resonant cavity around the tuning blind holes 21. In the present embodiment, the shape of the isolation window 16 is "T" and "ten", and it is obvious that the isolation window may also be "I" shaped, "L" shaped, circular, square, or formed in other shapes as needed.
The tuning blind hole 21 extends from the upper surface 11 of the dielectric body 10 to the inside of the dielectric body 10, and the depth of the tuning blind hole 21 can be formed to different depths according to the requirement of the resonant frequency. Each tuning blind hole 21 may be set to the same depth or may be set to a different depth.
The dielectric body 10 is preferably integrally formed of a ceramic material, which not only can serve as a signal transmission function, but also can serve as a structural support, and the dielectric body 10 can also be formed of other high dielectric constant materials, such as glass, electrically insulating high molecular polymers, and the like. It is obvious that the dielectric filter 100 may be formed by assembling a plurality of resonators.
The surface of the dielectric body 10 is covered with a metal plating, and the surface of the dielectric body 10 includes the inner surface of the tuning blind hole 21 and the inner surface of the isolation window 16. The inner surfaces of the first capacitive coupling hole 22 and the second capacitive coupling hole 23 are also covered with a metal plating layer, and a high conductivity metal layer such as silver plating or copper plating is generally used to improve the performance.
In the present embodiment, as shown in fig. 1 to 3, the cross-section of the first capacitive coupling hole 22 and the second capacitive coupling hole 23 is circular, and in other embodiments, the cross-section of the first capacitive coupling hole 22 and/or the second capacitive coupling hole 23 may be square, oval or other shapes. The first capacitive coupling hole 22 and the second capacitive coupling hole 23 are formed in an 'L' shape to cross. And the aperture of the first capacitive coupling hole 22 and the aperture of the second capacitive coupling hole 23 are substantially the same, of course, the aperture of the first capacitive coupling hole 22 and the aperture of the second capacitive coupling hole 23 may be set to be different according to the requirement.
In one embodiment, as shown in fig. 4, the first capacitive coupling hole 22 and the second capacitive coupling hole 23 extend and cross each other to form a "T" shape. The aperture of the second capacitive coupling hole 23 is reduced in a stepwise manner.
In another embodiment, as shown in fig. 5, the first capacitive coupling hole 22 and the second capacitive coupling hole 23 extend to cross each other to form a cross shape.
In another embodiment, as shown in fig. 6, the aperture diameters of the first capacitive coupling hole 22 and the second capacitive coupling hole 23 are reduced in a stepwise manner.
Thus, the first capacitive coupling hole 22 and the second capacitive coupling hole 23 may extend and cross each other to form an "L" shape, a "ten" shape, a "T" shape, or other shapes.
In the embodiment shown in fig. 4 and 6, the aperture of the first capacitive coupling hole 22 and/or the second capacitive coupling hole 23 is reduced stepwise from outside to inside, so that the side cross-section of the first capacitive coupling hole 22 and/or the second capacitive coupling hole 23 is formed in a trapezoidal shape. The aperture of the first capacitive coupling hole 22 and the second capacitive coupling hole 23 is related to the amount of capacitive coupling. Obviously, the aperture of the first capacitive coupling hole 22 and/or the second capacitive coupling hole 23 may also be gradually increased from the outside to the inside, or may be increased in a stepwise manner, or in other variations. . The first capacitive coupling hole 22 and the second capacitive coupling hole 23 are formed by mutually penetrating blind holes, and the depth thereof is also related to the capacitive coupling amount.
In another embodiment, as shown in FIG. 7, an electroless-plated region 231 is disposed in the second coupling hole 23, and is shaded in FIG. 7. The location, area, number, size and shape of the non-plated regions 231 can be selected according to the strength of the capacitive coupling. It is obvious that an electroless plated area can also be provided in the first coupling hole 22.
Therefore, the aperture, shape and depth of the first capacitive coupling hole 22 and the second capacitive coupling hole 23, and the non-plating region can be adjusted comprehensively according to the actual design size and the engineering realization difficulty to obtain the required capacitive coupling amount, so as to realize the designed filter frequency response characteristic.
In the specific design and manufacture, the dielectric body 10 with the tuning blind hole 21, the isolation window 16, the first capacitive coupling hole 22 and the second capacitive coupling hole 23 can be obtained by integral molding, and then the surface metallization, such as surface plating, is performed on the body to obtain the dielectric filter 100, so that the processing process thereof can be simpler.
Finally, the two capacitive coupling holes which are communicated with each other in the dielectric body are arranged on the coupling connection bridge between two adjacent dielectric resonators on the dielectric filter, wherein one of the capacitive coupling holes extends from the upper surface or the lower surface of the dielectric body to the inside of the dielectric body, and the other capacitive coupling hole extends inwards from the side wall of the dielectric body, so that the coupling form of the coupling connection bridge is capacitive coupling. The invention can obtain capacitive coupling only by simply adjusting the coupling window structure formed by the conventional coupling connection bridge, thereby realizing the required frequency characteristic of the filter. The mode for realizing capacitive coupling provided by the invention has the characteristics of simple adjustment mode and convenience in processing, and is suitable for batch production.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A dielectric filter comprises a dielectric body, at least two dielectric resonators are arranged on the dielectric body, each dielectric resonator comprises at least one tuning blind hole for adjusting resonant frequency, the tuning blind hole is arranged on the upper surface of the dielectric body, a coupling connection bridge is arranged between two adjacent dielectric resonators, and the dielectric filter is characterized in that,
the coupling connection bridge is provided with two capacitive coupling holes which are communicated in the medium body in a penetrating way, wherein one capacitive coupling hole extends from the upper surface or the lower surface of the medium body to the inside of the medium body, and the other capacitive coupling hole extends inwards from the side wall of the medium body.
2. The dielectric filter of claim 1, wherein the capacitive coupling hole is circular or square in cross-section.
3. The dielectric filter of claim 1, wherein the aperture of the capacitive coupling hole is gradually reduced or stepwise reduced from outside to inside.
4. The dielectric filter of claim 1, wherein the two capacitive coupling holes extend and cross each other to form an "L" shape, a "ten" shape, or a "T" shape.
5. The dielectric filter of claim 1, wherein the dielectric body is formed of a ceramic material.
6. A dielectric filter as recited in claim 1, wherein the dielectric body surface and the inner surface of the capacitive coupling hole are coated with a metal plating.
7. A dielectric filter as recited in claim 6, wherein the capacitive coupling aperture has an electroless plated region disposed therein.
8. The dielectric filter according to claim 1, wherein the dielectric filter is provided with an isolation window for dividing the dielectric filter into a plurality of individual dielectric resonators, the isolation window penetrating upper and lower surfaces of the dielectric filter.
9. The dielectric filter of claim 8, wherein the isolation window is "I" -shaped, "L" -shaped, "T" -shaped, or "ten" -shaped.
10. The dielectric filter of claim 8, wherein the dielectric filter is partitioned by the isolation window to form six resonant cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014726.6A CN111106419A (en) | 2020-01-07 | 2020-01-07 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014726.6A CN111106419A (en) | 2020-01-07 | 2020-01-07 | Dielectric filter |
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| Publication Number | Publication Date |
|---|---|
| CN111106419A true CN111106419A (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010014726.6A Pending CN111106419A (en) | 2020-01-07 | 2020-01-07 | Dielectric filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839160A (en) * | 2020-06-23 | 2021-12-24 | 大富科技(安徽)股份有限公司 | Communication equipment and dielectric waveguide filter thereof |
| WO2022110854A1 (en) * | 2020-11-27 | 2022-06-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Dielectric filter |
-
2020
- 2020-01-07 CN CN202010014726.6A patent/CN111106419A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839160A (en) * | 2020-06-23 | 2021-12-24 | 大富科技(安徽)股份有限公司 | Communication equipment and dielectric waveguide filter thereof |
| CN113839160B (en) * | 2020-06-23 | 2023-06-13 | 大富科技(安徽)股份有限公司 | Communication equipment and dielectric waveguide filter thereof |
| WO2022110854A1 (en) * | 2020-11-27 | 2022-06-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Dielectric filter |
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