CN111682291B - Medium filter coupling conversion structure and communication equipment - Google Patents
Medium filter coupling conversion structure and communication equipment Download PDFInfo
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- CN111682291B CN111682291B CN202010722569.4A CN202010722569A CN111682291B CN 111682291 B CN111682291 B CN 111682291B CN 202010722569 A CN202010722569 A CN 202010722569A CN 111682291 B CN111682291 B CN 111682291B
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- blind hole
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- 230000008878 coupling Effects 0.000 title claims abstract description 60
- 238000010168 coupling process Methods 0.000 title claims abstract description 60
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 238000004891 communication Methods 0.000 title claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000001465 metallisation Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000001629 suppression Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000024241 parasitism Effects 0.000 abstract description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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
- H01P1/2002—Dielectric waveguide filters
Abstract
The invention discloses a dielectric filter coupling conversion structure, which comprises a ceramic dielectric body, wherein a first resonance blind hole, a second resonance blind hole and a coupling blind hole are formed in the ceramic dielectric body, and metal shielding layers are formed on the surfaces of the ceramic dielectric body, the first resonance blind hole, the second resonance blind hole and the coupling blind hole through metallization treatment; the second resonance blind hole is a step hole, and the depth of the second resonance blind hole is larger than or equal to the depth of the coupling blind hole; the invention also discloses a communication device. The stepped resonant holes are formed in the invention, and the resonant frequency of the higher-order mode can be adjusted by adjusting the radius ratio of the stepped holes and the height difference of the steps, so that the attenuation of far-end parasitism is increased, and the out-of-band suppression of the far end of the medium filter with the full blind hole structure is improved; the processing technology is simple, the realization is convenient, and the use effect is good.
Description
Technical Field
The present invention relates to the field of dielectric filters, and in particular, to a dielectric filter coupling conversion structure and a communication device.
Background
Filters are indispensable electronic components in microwave communication systems, the performance of which determines the quality of the communication system. With the advent of 5G communication technology, the number of 5G base station antenna ports increases from the traditional 8 ports to 64 ports and 128 ports, thereby greatly increasing the filter requirement. Therefore, a small-sized, lightweight, high-performance filter has been and is imperative. The dielectric filter combines the excellent performances of the cavity filter and the traditional dielectric filter, so that the dielectric filter becomes the best choice in 5G communication equipment. Along with the increasing requirement of communication systems on out-of-band rejection, in order to realize high rejection of filter stop band, the dielectric filter generally needs to be cross-coupled to introduce transmission zero points so as to improve the filter stop band rejection, but the existing dielectric filter generally adopts a full blind hole structure, and the far-end parasitism is larger, so that the filtering effect of the far-end is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dielectric filter coupling conversion structure and communication equipment which can well inhibit far-end parasitism and improve the far-end filtering effect.
The technical scheme of the invention is as follows:
a dielectric filter coupling conversion structure comprises a ceramic dielectric body, wherein a first resonance blind hole, a second resonance blind hole and a coupling blind hole are formed in the ceramic dielectric body, and metal shielding layers are formed on the surfaces of the ceramic dielectric body, the first resonance blind hole, the second resonance blind hole and the coupling blind hole through metallization treatment; the first resonance blind hole and the second resonance blind hole are formed in the upper surface of the ceramic dielectric body, the coupling blind hole is formed between the first resonance blind hole and the second resonance blind hole, and a coupling window is formed between the first resonance blind hole and the second resonance blind hole; the second resonance blind hole is a step hole, and the depth of the second resonance blind hole is larger than or equal to the depth of the coupling blind hole.
Further, the second resonance blind hole comprises a second main resonance hole formed in the upper surface of the ceramic dielectric body and a second auxiliary resonance hole formed in the center of the bottom surface of the second main resonance hole, the second main resonance hole and the second auxiliary resonance hole are cylindrical holes, and the diameter of the second main resonance hole is larger than that of the second auxiliary resonance hole.
Further, the first resonance blind hole is a cylindrical hole, the depth of the first resonance blind hole is smaller than the depth of the coupling blind hole, and the depth of the second main resonance hole is smaller than the depth of the first resonance blind hole.
Further, the first resonance blind hole is a step hole, and the depth of the first resonance blind hole is larger than or equal to the depth of the coupling blind hole; the first resonance blind hole comprises a first main resonance hole formed in the upper surface of the ceramic dielectric body and a first auxiliary resonance hole formed in the center of the bottom surface of the first main resonance hole, the first main resonance hole and the first auxiliary resonance hole are cylindrical holes, and the diameter of the first main resonance hole is larger than that of the first auxiliary resonance hole.
Further, the coupling blind hole is round, rectangular, kidney-shaped or oval.
Furthermore, the coupling blind hole is formed on the upper surface of the ceramic dielectric body.
Furthermore, the coupling blind hole is formed on the lower surface of the ceramic dielectric body.
A communication device comprising a dielectric filter employing a dielectric filter coupling switching structure as described in any one of the preceding claims.
The beneficial effects are that: in the invention, the step-shaped resonant holes are arranged, and the resonant frequency of the higher-order mode can be adjusted by adjusting the radius ratio of the step holes and the height difference of the steps, so that the attenuation of parasitic far-end is increased, and the out-of-band suppression of the far-end of the medium filter with the full blind hole structure is improved; the processing technology is simple, the realization is convenient, and the use effect is good.
Drawings
Fig. 1 is a top view of a dielectric filter coupling conversion structure according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a graph showing the comparison of attenuation curves of a conventional resonant blind via coupling conversion structure according to an embodiment of the present invention;
FIG. 4 is a graph showing the variation of coupling with frequency according to the first embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a dielectric filter coupling conversion structure according to a second embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a dielectric filter coupling conversion structure according to a third embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a dielectric filter coupling conversion structure according to a fourth embodiment of the present invention.
In the figure: 1. the ceramic dielectric body comprises a first resonance blind hole, a second resonance blind hole, a coupling blind hole, a ceramic dielectric body, a first main resonance hole, a first auxiliary resonance hole, a second main resonance hole and a second auxiliary resonance hole.
Detailed Description
In order to better understand the technical solution in the embodiments of the present invention and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solution in the embodiments of the present invention is described in further detail below with reference to the accompanying drawings.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the term "connected" should be interpreted broadly, and for example, it may be a mechanical connection or an electrical connection, or may be a connection between two elements, or may be a direct connection or may be an indirect connection through an intermediary, and it will be understood to those skilled in the art that the specific meaning of the term may be interpreted according to the specific circumstances.
Example 1
As shown in fig. 1, a dielectric filter coupling conversion structure provided in the first embodiment of the present invention includes a ceramic dielectric body 10, a first resonant blind hole 1, a second resonant blind hole 2 and a coupling blind hole 3 are disposed on an upper surface of the ceramic dielectric body 10, and metal shielding layers are formed on surfaces of the ceramic dielectric body 10, the first resonant blind hole 1, the second resonant blind hole 2 and the coupling blind hole 3 through metallization.
The coupling blind hole 3 is arranged between the first resonance blind hole 1 and the second resonance blind hole 2, and a coupling window is formed between the first resonance blind hole 1 and the second resonance blind hole 2; the first blind resonant hole 1 is preferably a cylindrical hole, and the depth of the first blind resonant hole 1 is smaller than the depth of the blind coupling hole 3; the second resonant blind hole 2 is a stepped hole, and comprises a second main resonant hole 21 formed on the upper surface of the ceramic dielectric body 10 and a second auxiliary resonant hole 22 formed at the center of the bottom surface of the second main resonant hole 21, wherein the depth of the second main resonant hole 21 is preferably smaller than that of the first resonant blind hole 1; the second main resonance hole 21 and the second sub resonance hole 22 are preferably cylindrical holes, and the diameter of the second main resonance hole 21 is larger than that of the second sub resonance hole 22. The depth of the second resonance blind hole 2 (i.e. the sum of the depths of the second main resonance hole 21 and the second auxiliary resonance hole 22) is larger than or equal to the depth of the coupling blind hole 3; the coupling blind hole 3 is circular, rectangular, kidney-shaped or oval, preferably circular.
The present embodiment can adjust the size of the resonant frequency by adjusting the shape, aperture and depth of the coupling blind hole 3, and the aperture and depth of the first resonant blind hole 1, the second main resonant hole 21 and the second auxiliary resonant hole 22. The resonance frequency of the higher order mode can be adjusted by adjusting the radius ratio of the step holes, so that the attenuation of the parasitic far-end is increased, and the out-of-band suppression of the far-end of the medium filter with the full blind hole structure is improved. As shown in fig. 3, in the present embodiment, the attenuation curve of the dielectric filter structure is compared with that of the prior art, and after one resonant blind hole is changed into a stepped hole, the high-end stop band suppression is higher. As shown in fig. 4, a graph of the coupling versus frequency for the coupling conversion structure of the present invention is shown.
Example two
As shown in fig. 5, the difference between the coupling conversion structure of the dielectric filter provided in the second embodiment of the present invention and the first embodiment is that: in this embodiment, the coupling blind hole 3 is formed on the lower surface of the ceramic dielectric body 10, and other structures are the same as those of the first embodiment.
The working principle of this embodiment is the same as that of the first embodiment, and the attenuation curve and the coupling-dependent frequency variation curve are similar to those of the first embodiment.
Example III
As shown in fig. 6, the difference between the dielectric filter coupling conversion structure provided in the third embodiment of the present invention and the first embodiment is that: in this embodiment, the first resonant blind hole 1 is a stepped hole, and includes a first main resonant hole 11 formed on the upper surface of the ceramic dielectric body 10 and a first auxiliary resonant hole 12 formed at the center of the bottom surface of the first main resonant hole 11, where the first main resonant hole 11 and the first auxiliary resonant hole 12 are cylindrical holes, and the diameter of the first main resonant hole 11 is greater than that of the first auxiliary resonant hole 12; the depth of the first blind resonance hole 1 (i.e. the sum of the depths of the first main resonance hole 11 and the first auxiliary resonance hole 12) is greater than or equal to the depth of the blind coupling hole 3.
The working principle of this embodiment is the same as that of the first embodiment, and the attenuation curve and the coupling-dependent frequency variation curve are similar to those of the first embodiment.
Example IV
As shown in fig. 7, the fourth embodiment of the present invention provides a dielectric filter coupling conversion structure, which is different from the third embodiment in that: in this embodiment, the coupling blind hole 3 is formed on the lower surface of the ceramic dielectric body 10, and other structures are the same as those of the embodiment.
The working principle of this embodiment is the same as that of the embodiment three, and the attenuation curve and the coupling-to-frequency curve are similar to those of the embodiment one.
Example five
The embodiment provides a communication device, which comprises a dielectric filter, wherein the dielectric filter adopts the dielectric filter coupling conversion structure according to any one of the embodiments. The communication device may be a passive communication device such as an antenna or an active communication device such as a transceiver.
The undescribed portions of the invention are consistent with the prior art and are not described in detail herein.
The foregoing is only the embodiments of the present invention, and therefore, the patent scope of the invention is not limited thereto, and all equivalent structures made by the description of the invention and the accompanying drawings are directly or indirectly applied to other related technical fields, which are all within the scope of the invention.
Claims (4)
1. The dielectric filter coupling conversion structure comprises a ceramic dielectric body, and is characterized in that a first resonance blind hole, a second resonance blind hole and a coupling blind hole are formed in the ceramic dielectric body, and metal shielding layers are formed on the surfaces of the ceramic dielectric body, the first resonance blind hole, the second resonance blind hole and the coupling blind hole through metallization treatment; the first resonance blind hole and the second resonance blind hole are formed in the upper surface of the ceramic dielectric body, the coupling blind hole is formed between the first resonance blind hole and the second resonance blind hole, and a coupling window is formed between the first resonance blind hole and the second resonance blind hole; the coupling blind holes are round, rectangular, waist-shaped or oval; the second resonance blind hole is a step hole, and the depth of the second resonance blind hole is larger than or equal to the depth of the coupling blind hole;
the second resonance blind hole comprises a second main resonance hole formed in the upper surface of the ceramic dielectric body and a second auxiliary resonance hole formed in the center of the bottom surface of the second main resonance hole, the second main resonance hole and the second auxiliary resonance hole are cylindrical holes, and the diameter of the second main resonance hole is larger than that of the second auxiliary resonance hole;
the first resonance blind hole is a cylindrical hole, the depth of the first resonance blind hole is smaller than that of the coupling blind hole, and the depth of the second main resonance hole is smaller than that of the first resonance blind hole.
2. The coupling conversion structure of claim 1, wherein the coupling blind hole is formed on an upper surface of the ceramic dielectric body.
3. The coupling conversion structure of claim 1, wherein the coupling blind hole is formed on a lower surface of the ceramic dielectric body.
4. A communication device comprising a dielectric filter, characterized in that the dielectric filter employs a dielectric filter coupling conversion structure as claimed in any one of claims 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010722569.4A CN111682291B (en) | 2020-07-24 | 2020-07-24 | Medium filter coupling conversion structure and communication equipment |
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| CN202010722569.4A CN111682291B (en) | 2020-07-24 | 2020-07-24 | Medium filter coupling conversion structure and communication equipment |
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| CN111682291A CN111682291A (en) | 2020-09-18 |
| CN111682291B true CN111682291B (en) | 2024-03-12 |
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| CN112635950B (en) * | 2020-12-30 | 2022-12-27 | 京信射频技术(广州)有限公司 | Dielectric waveguide filter and method for manufacturing the same |
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