CN109546269B - Dielectric waveguide filter - Google Patents
Dielectric waveguide filter Download PDFInfo
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- CN109546269B CN109546269B CN201811484428.2A CN201811484428A CN109546269B CN 109546269 B CN109546269 B CN 109546269B CN 201811484428 A CN201811484428 A CN 201811484428A CN 109546269 B CN109546269 B CN 109546269B
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- transmission channel
- waveguide filter
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- 230000008054 signal transmission Effects 0.000 claims abstract description 104
- 239000002184 metal Substances 0.000 claims description 33
- 238000009713 electroplating Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 7
- 238000006880 cross-coupling reaction Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Classifications
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
Abstract
The invention relates to a dielectric waveguide filter, which comprises a first dielectric resonator and a second dielectric resonator. Because the first dielectric resonator and the second dielectric resonator are respectively provided with the first signal transmission channel and the second signal transmission channel, signals can be conducted between the first dielectric resonator and the second dielectric resonator, and cross coupling can be formed between the two resonators. Therefore, attenuation poles can be generated at the two ends of the frequency response passband of the dielectric waveguide filter, thereby further improving the frequency selection characteristic of the dielectric waveguide filter. In addition, when the frequency selection characteristic is improved, the additional cavity structure is not needed, and only the first medium body and the second medium body are improved in structure, so that the volume is not increased. Therefore, the dielectric waveguide filter is advantageous in miniaturization of the product.
Description
Technical Field
The invention relates to the technical field of microwave radio frequency devices, in particular to a dielectric waveguide filter.
Background
The filter is a frequency selective device and is an integral part of the communication equipment. With the rapid development of communication systems, miniaturization of devices is a key for development of communication equipment, and miniaturization, high performance and low power consumption of filters are key for miniaturization of 5G equipment. Compared with the traditional waveguide filter, the dielectric waveguide filter has great advantages, so the dielectric waveguide filter has wide application prospect in 5G communication equipment.
The dielectric waveguide filter improves the air filling form of the traditional waveguide filter into high dielectric constant ceramic material filling, and the ceramic dielectric material plays roles of transmitting signals and supporting structures through die casting. The metal material is attached to the surface of the porcelain dielectric material and serves as an electric wall to play a role of electromagnetic shielding. To improve the frequency selective characteristics of dielectric waveguide filters, a zero-cavity structure is typically used to form poles outside the frequency response passband. The zero-cavity structure refers to that a dielectric single cavity with resonant frequency at the high end or the low end of the passband of the filter is added outside the dielectric waveguide filter, and the zero-cavity structure is coupled with an input/output connector through the dielectric single cavity.
However, the number of poles is consistent with the number of zero cavities that are added, but the added zero cavities result in an increase in the size of the dielectric waveguide filter, while adding weight and cost. Therefore, the mode of improving the frequency selection characteristic of the conventional dielectric waveguide filter is not beneficial to miniaturization of products.
Disclosure of Invention
Based on this, it is necessary to provide a dielectric waveguide filter against the problem that the conventional dielectric waveguide filter is disadvantageous for miniaturization of the product.
The dielectric waveguide filter comprises a first dielectric resonator and a second dielectric resonator which is laminated with the first dielectric resonator, wherein the first dielectric resonator comprises a first dielectric body and a first metal wall coated on the outer surface of the first dielectric body, the second dielectric resonator comprises a second dielectric body and a second metal wall coated on the outer surface of the second dielectric body, and one sides of the first metal wall and the second metal wall which are opposite to each other are respectively a first contact surface and a second contact surface;
the first dielectric body and the second dielectric body are internally provided with a first signal transmission channel and a second signal transmission channel which are electrically connected with the first signal transmission channel respectively, and the first signal transmission channel and the second signal transmission channel are insulated from the first contact surface and the second contact surface respectively.
In one embodiment, the first signal transmission channel and the second signal transmission channel penetrate through the first dielectric body and the second dielectric body, respectively.
In one embodiment, the first signal transmission channel extends through the first dielectric body, and the second signal transmission channel does not extend through the second dielectric body.
In one embodiment, neither the first signal transmission channel nor the second signal transmission channel extends through the first dielectric body and the second dielectric body.
In one embodiment, the first signal transmission channel is arranged coaxially with the second signal transmission channel.
In one embodiment, the first contact surface is provided with a first window exposing the first dielectric body, the second contact surface is provided with a second window exposing the second dielectric body, the first window and the second window are at least partially overlapped, and the first signal transmission channel and the second signal transmission channel pass through the area where the first window and the second window are overlapped.
In one embodiment, the first window and the second window are circular and completely overlap.
In one embodiment, the first signal transmission channel and the second signal transmission channel extend in a direction perpendicular to the first contact surface and the second contact surface, respectively.
In one embodiment, the first signal transmission channel and the second signal transmission channel are metallized channels.
In one embodiment, the metallized channels have a circular cross-section.
In the dielectric waveguide filter, the first signal transmission channel and the second signal transmission channel are respectively formed in the first dielectric resonator and the second dielectric resonator, so that signals can be conducted between the first dielectric resonator and the second dielectric resonator, and cross coupling is formed between the first resonator and the second resonator. Therefore, attenuation poles can be generated at the two ends of the frequency response passband of the dielectric waveguide filter, thereby further improving the frequency selection characteristic of the dielectric waveguide filter. In addition, when the frequency selection characteristic is improved, the additional cavity structure is not needed, and only the first medium body and the second medium body are improved in structure, so that the volume is not increased. Therefore, the dielectric waveguide filter is advantageous in miniaturization of the product.
Drawings
FIG. 1 is a schematic diagram of a dielectric waveguide filter according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a laminated structure of a first dielectric resonator and a second dielectric resonator according to a first embodiment;
FIG. 3 is a cross-sectional view of the laminate structure of FIG. 2;
FIG. 4 is a schematic diagram of a laminated structure of a first dielectric resonator and a second dielectric resonator according to a second embodiment;
FIG. 5 is a cross-sectional view of the laminate structure of FIG. 4;
FIG. 6 is a schematic diagram of a laminated structure of a first dielectric resonator and a second dielectric resonator according to a third embodiment;
FIG. 7 is a cross-sectional view of the laminate structure of FIG. 6;
fig. 8 is a graph showing the frequency response of the dielectric waveguide filter according to the preferred embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a dielectric waveguide filter 100 according to a preferred embodiment of the present invention includes a first dielectric resonator 110 and a second dielectric resonator 120.
The first dielectric resonator 110 and the second dielectric resonator 120 are stacked. Dielectric waveguide filter 100 generally includes a plurality of dielectric resonators that may be distributed in two or more layers, and each layer may also be distributed with a plurality of dielectric resonators. The first dielectric resonator 110 and the second dielectric resonator 120 are not particularly limited to any two dielectric resonators, but generally refer to two dielectric resonators satisfying a mutual lamination relationship among all the plurality of dielectric resonators constituting the dielectric waveguide filter 100.
For example, as shown in fig. 1, the dielectric waveguide filter 100 includes four stacked dielectric resonators, two dielectric resonators are distributed in each layer, and two dielectric resonators in the same layer are coupled to each other. Then, the first dielectric resonator 110 may be any one of four resonators, and the second resonator 120 is a dielectric resonator stacked with the first dielectric resonator 110.
In order to input and output signals, a signal connector 130 is further provided to a dielectric resonator constituting the dielectric waveguide filter 100.
Referring to fig. 2 to fig. 7, the first dielectric resonator 110 includes a first dielectric body 111 and a first metal wall 113, and the first metal wall 113 is coated on an outer surface of the first dielectric body 111. Specifically, a metal film may be plated on the outer surface of the first dielectric body 111 by electroplating, so as to form the first metal wall 113. The outer contour of the first dielectric resonator 110 is generally cubic, so the first metal wall 113 is also cubic in structure.
The second dielectric resonator 120 has substantially the same structure as the first dielectric resonator 110. The second dielectric resonator 120 includes a second dielectric body 121 and a second metal wall 123 coated on an outer surface of the second dielectric body 121. Since the first dielectric resonator 110 and the second dielectric resonator 120 are stacked, one of the surfaces of the first metal wall 113 and the second metal wall 123 faces and contacts each other, and the opposite sides of the first metal wall 113 and the second metal wall 123 are respectively a first contact surface (not shown) and a second contact surface (not shown). For a dielectric resonator having a cube structure, the first contact surface and the second contact surface are rectangular planes.
The first dielectric body 111 has a first signal transmission channel 115 formed therein, and the second dielectric body 121 has a second signal transmission channel 125 electrically connected to the first signal transmission channel 115. Both the first signal transmission channel 115 and the second signal transmission channel 125 can realize signal transmission. Thus, signals may be conducted between the first dielectric resonator 110 and the second dielectric resonator 120 through the first signal transmission channel 115 and the second signal transmission channel 125.
In one embodiment, the first signal transmission channel 115 and the second signal transmission channel 125 are metallized channels.
The metallized channels may be through holes or blind holes depending on the different forms of the first signal transmission channel 115 and the second signal transmission channel 125. The metallized channels are formed as follows: the first dielectric body 111 and the second dielectric body 121 are drilled, and then liquid metal is filled into the holes and solidified, so that the hole walls are covered with a metal layer to realize conduction, and a first signal transmission channel 115 and a second signal transmission channel 125 capable of transmitting signals are formed in the first dielectric body 111 and the second dielectric body 121.
Since the metal layer in the metallized pore canal and the pore wall are adhered tightly to form the metal pore wall, gaps between the first signal transmission channel 115 and the second signal transmission channel 125 and the first dielectric body 111 and the second dielectric body 121 can be avoided, and the functions of the dielectric waveguide filter 100 are prevented from being affected by the capacitive effect.
Further, for ease of processing and forming, in one embodiment, the metallized channels are circular in cross-section.
It should be noted that, in other embodiments, the first signal transmission channel 115 and the second signal transmission channel 125 are not limited to be in a form of metallized channels, for example, the first signal transmission channel 115 and the second signal transmission channel 125 may also be metal probes embedded in the first dielectric body 111 and the second dielectric body 121, and only the metal probes need to be closely embedded in the first dielectric body 111 and the second dielectric body 121.
In one embodiment, the first signal transmission channel 115 is disposed coaxially with the second signal transmission channel 125.
In particular, the coaxial arrangement is more convenient for processing. Taking fig. 1 as an example, when forming the first signal transmission channel 115 and the second signal transmission channel 125, only one operation of drilling and filling with liquid metal is needed to be performed simultaneously.
It should be noted that the first signal transmission channel 115 and the second signal transmission channel 125 may be offset from each other by a certain distance, and only the contact of the metal hole wall portions of the metallized holes constituting the first signal transmission channel 115 and the second signal transmission channel 125 is ensured.
In one embodiment, the first signal transmission channel 115 and the second signal transmission channel 125 extend in a direction perpendicular to the first contact surface and the second contact surface, respectively. In the case where the first dielectric resonator 110 and the second dielectric resonator 120 are sized, it is advantageous to reduce the lengths of the first signal transmission channel 115 and the second signal transmission channel 125.
In addition, the first signal transmission channel 115 and the second signal transmission channel 125 are insulated from the first contact surface and the second contact surface, respectively. Therefore, the first signal transmission channel 115 and the second signal transmission channel 125 can be prevented from being directly connected to the first contact surface and the second contact surface. Moreover, since signals may be conducted between the first dielectric resonator 110 and the second dielectric resonator 120, cross coupling may be formed between the two resonators.
In one embodiment, the first contact surface is provided with a first window 101 exposing the first dielectric body 111, and the second contact surface is provided with a second window 102 exposing the second dielectric body 121. The first window 101 and the second window 102 at least partially overlap, and the first signal transmission channel 115 and the second signal transmission channel 125 pass through the region where the first window 101 and the second window 102 overlap.
Specifically, the first window 101 and the second window 102 are respectively an opening structure obtained by partially hollowing out the metal of the first contact surface and the second contact surface. The first window 101 and the second window 102 may be overlapped entirely or partially, and it is only necessary to ensure that the first signal transmission channel 115 and the second signal transmission channel 125 do not contact the first metal wall 113 and the second metal wall 123 when passing through the overlapped area.
Therefore, the first signal transmission channel 115 and the second signal transmission channel 125 can be insulated from the first contact surface and the second contact surface by the first window 101 and the second window 102, respectively. Since the insulating mode does not introduce a new insulating device, it is advantageous to simplify the structure of the dielectric waveguide filter 100 and reduce the processing difficulty and cost.
Further, to further reduce the processing difficulty, the opening sizes of the first window 101 and the second window 102 are reduced. In one embodiment, the first window 101 and the second window 102 are circular and completely overlap.
As shown in fig. 8, since cross coupling can be formed between the two resonators. Therefore, one attenuation pole can be generated at each end of the frequency response passband of the dielectric waveguide filter 100, thereby further improving the frequency selective characteristics of the dielectric waveguide filter 100. Compared with the zero cavity structure, the frequency selection characteristic is improved without additionally increasing the cavity structure, and only the first dielectric body 111 and the second dielectric body 121 are required to be structurally improved. Therefore, the elements of the dielectric waveguide filter 100 are not increased and the volume is not increased.
In addition, compared with a mode of forming a window by adopting an air gap and further generating an attenuation pole outside a frequency response channel, the first signal transmission channel 115 and the second signal transmission channel 125 do not need to be positioned accurately, so that the processing difficulty is greatly reduced, and the processing efficiency is improved.
Further, when the forms of the first signal transmission channel 115 and the second signal transmission channel 125 are adjusted, the coupling polarity and the coupling amount generated between the first dielectric resonator 110 and the second dielectric resonator 120 can be correspondingly adjusted, so that the intensity of the attenuation pole can be changed, and the precise adjustment of the frequency selection characteristic can be realized.
As shown in fig. 2 and 3, in the first embodiment, the first signal transmission channel 115 and the second signal transmission channel 125 respectively penetrate the first dielectric body 111 and the second dielectric body 121.
Specifically, when the first signal transmission channel 115 and the second signal transmission channel 125 are metallized channels, the first signal transmission channel 115 and the second signal transmission channel 125 are through holes. At this time, the first dielectric resonator 110 and the second dielectric resonator 120 are capacitively coupled. The coupling quantity between the two dielectric resonators can be adjusted by adjusting the positions of the through holes, so that the intensity of the attenuation pole is changed.
As shown in fig. 4 and 5, in the second embodiment, the first signal transmission channel 115 penetrates the first dielectric body 111, and the second signal transmission channel 125 does not penetrate the second dielectric body 121.
Specifically, when the first signal transmission channel 115 and the second signal transmission channel 125 are metallized channels, the first signal transmission channel 115 is a through hole, and the second signal transmission channel 125 is a blind hole. At this time, the first dielectric resonator 110 and the second dielectric resonator 120 are inductively coupled. The coupling quantity between the two dielectric resonators can be adjusted by adjusting the positions of the through holes and the blind holes and the depth of the blind holes, so that the intensity of an attenuation pole is changed.
As shown in fig. 6 and 7, in the third embodiment, neither the first signal transmission channel 115 nor the second signal transmission channel 125 penetrates the first dielectric body 111 nor the second dielectric body 121.
Specifically, when the first signal transmission channel 115 and the second signal transmission channel 125 are metallized channels, the first signal transmission channel 115 and the second signal transmission channel 125 are blind holes. At this time, the first dielectric resonator 110 and the second dielectric resonator 120 are capacitively coupled. The coupling quantity between the two dielectric resonators can be adjusted by adjusting the position and the depth of the blind hole, so that the intensity of an attenuation pole is changed.
In the dielectric waveguide filter 100, the first signal transmission channel 115 and the second signal transmission channel 125 are formed in the first dielectric resonator 110 and the second dielectric resonator 120, respectively, so that signals can be conducted between the first dielectric resonator 110 and the second dielectric resonator 120, and cross coupling can be formed between the two resonators. Therefore, attenuation poles can be generated at both ends of the frequency response passband of the dielectric waveguide filter 100, thereby further improving the frequency selective characteristics of the dielectric waveguide filter 100. In addition, when the frequency selection characteristic is improved, the additional cavity structure is not required, and only the first dielectric body 111 and the second dielectric body 121 are required to be structurally improved, so that the volume is not increased. Therefore, the dielectric waveguide filter 100 described above is advantageous in downsizing of the product.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The dielectric waveguide filter is characterized by comprising a first dielectric resonator and a second dielectric resonator which is laminated with the first dielectric resonator, wherein the first dielectric resonator comprises a first dielectric body and a first metal wall coated on the outer surface of the first dielectric body, the second dielectric resonator comprises a second dielectric body and a second metal wall coated on the outer surface of the second dielectric body, and one sides of the first metal wall and the second metal wall which are opposite to each other are respectively a first contact surface and a second contact surface;
the first dielectric body and the second dielectric body are internally provided with a first signal transmission channel and a second signal transmission channel electrically connected with the first signal transmission channel respectively, the first signal transmission channel and the second signal transmission channel are insulated from the first contact surface and the second contact surface respectively, the second signal transmission channel does not penetrate through the second dielectric body, and the first signal transmission channel and the second signal transmission channel are coaxially arranged.
2. The dielectric waveguide filter according to claim 1, wherein the first metal wall is a metal film plated on the outer surface of the first dielectric body by electroplating; the outer contour of the first dielectric resonator is cube-shaped, and the outer contour of the first metal wall is cube-shaped.
3. The dielectric waveguide filter of claim 1, wherein the first signal transmission channel extends through the first dielectric body.
4. The dielectric waveguide filter of claim 1, wherein the first signal transmission channel does not extend through the first dielectric body.
5. The dielectric waveguide filter according to claim 1, wherein the second metal wall is a metal film plated on the outer surface of the second dielectric body by electroplating; the outer contour of the second dielectric resonator is cube-shaped, and the outer contour of the second metal wall is cube-shaped.
6. The dielectric waveguide filter of claim 1, wherein the first contact surface is provided with a first window exposing the first dielectric body, the second contact surface is provided with a second window exposing the second dielectric body, the first window and the second window at least partially overlap, and the first signal transmission channel and the second signal transmission channel pass through an area where the first window and the second window overlap.
7. The dielectric waveguide filter of claim 6, wherein the first window and the second window are circular and completely overlap.
8. The dielectric waveguide filter of claim 1, wherein the first and second signal transmission channels extend in a direction perpendicular to the first and second contact surfaces, respectively.
9. The dielectric waveguide filter of any of claims 1-8, wherein the first signal transmission channel and the second signal transmission channel are metallized channels.
10. The dielectric waveguide filter of claim 9, wherein the metallized channels have a circular cross-section.
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| CN201811484428.2A CN109546269B (en) | 2018-12-06 | 2018-12-06 | Dielectric waveguide filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811484428.2A CN109546269B (en) | 2018-12-06 | 2018-12-06 | Dielectric waveguide filter |
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| CN109546269A CN109546269A (en) | 2019-03-29 |
| CN109546269B true CN109546269B (en) | 2024-02-27 |
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| CN110224210B (en) * | 2019-05-30 | 2024-04-26 | 江苏灿勤科技股份有限公司 | Laminated dielectric filter comprising negative coupling structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682924A (en) * | 2018-05-29 | 2018-10-19 | 广东曼克维通信科技有限公司 | Substrate integral wave guide filter |
| CN209183692U (en) * | 2018-12-06 | 2019-07-30 | 京信通信系统（中国）有限公司 | Dielectric waveguide filter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682924A (en) * | 2018-05-29 | 2018-10-19 | 广东曼克维通信科技有限公司 | Substrate integral wave guide filter |
| CN209183692U (en) * | 2018-12-06 | 2019-07-30 | 京信通信系统（中国）有限公司 | Dielectric waveguide filter |
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