CN111313131A - Dielectric waveguide filter - Google Patents
Dielectric waveguide filter Download PDFInfo
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- CN111313131A CN111313131A CN202010212443.2A CN202010212443A CN111313131A CN 111313131 A CN111313131 A CN 111313131A CN 202010212443 A CN202010212443 A CN 202010212443A CN 111313131 A CN111313131 A CN 111313131A
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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
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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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
The invention provides a dielectric waveguide filter, which comprises a dielectric block, a resonant cavity group, an input port, an output port and a negative coupling hole structure, wherein a layer of metal silver is covered on the surface of the dielectric block, and the input port and the output port are arranged on the surface of one side of the dielectric block in parallel; meanwhile, the coupling structure is a special-shaped groove structure which is sequentially arranged along the length direction of the dielectric block, and the grooves are flexibly arranged, so that the coupling effect among various cavities is realized, and a filter with asymmetric left and right transmission zeros is realized; in addition, the invention can realize the coupling structure of the adjacent resonant cavities and the cross coupling structure of the non-adjacent resonant cavities, namely, the cross coupling between the cross resonant cavities is realized, the problem that the transmission zero point with stronger coupling can not be realized is avoided, and the whole structure is stable and reliable.
Description
Technical Field
The invention belongs to the technical field of filters, and particularly relates to a dielectric waveguide filter.
Background
At present, in the 5G era, the requirement of Massive MIMO (Massive antenna technology) on the integration of a Massive antenna is limited, a filter needs to be more miniaturized and integrated, and under the condition of limiting the size of a cavity, due to the loss of materials of the filter, the metal coaxial cavity filter and the metal cavity dielectric filter cannot obtain a very high Q value, so that various performance indexes are limited. In order to meet the requirement of the 5G base station filter on miniaturization, a ceramic dielectric filter which is easier to miniaturize becomes a mainstream solution. The electromagnetic wave resonance in the ceramic dielectric filter occurs in the dielectric material, the traditional metal cavity is replaced by the metal coating, so the volume is smaller, the weight is lighter, and in addition, the dielectric filter has the advantages of high Q value, good frequency selection characteristic, good working frequency stability, small insertion loss, small high and low temperature drift characteristics and the like.
The electromagnetic principle of the existing dielectric waveguide filter is the same as that of the traditional metal cavity waveguide filter, and the difference is that the dielectric waveguide filter generally adopts functional ceramic medium or other dielectric materials, and the traditional metal cavity waveguide filter adopts air; in the functional ceramic dielectric, the ceramic dielectric is taken as an example for explanation, and is not limited to only that the dielectric constants of the ceramic dielectric and air are different. The key design technology of the dielectric waveguide filter as a new type of waveguide filter lies in the realization of a topological structure and a transmission zero point realized by a new negative coupling structure. However, in the conventional dielectric waveguide filter, one of the structures thereof is provided with a plurality of parallel symmetrical resonant cavities; secondly, the resonant cavity is a T-shaped groove or a cross-shaped groove or a straight-line-shaped groove;
thirdly, the coupling quantity between two adjacent cavities is adjusted through a T-shaped groove or a cross-shaped groove or a straight-shaped groove; fourthly, in addition, the frequency is adjusted by adjusting the size and the depth of the holes at the resonant cavities;
and fifthly, coupling among the cavities on one side is realized through the T-shaped groove on one side to realize two transmission zeros, and coupling among the cavities on the other side is realized through the T-shaped groove on the other side to realize two transmission zeros.
The existing dielectric waveguide filter has the following defects:
firstly, the left and right transmission zeros realized by the structure are symmetrical and only can be suitable for a filter with lower requirements on out-of-band near-end rejection and more symmetrical out-of-band rejection;
secondly, due to structural limitation, the existing scheme can not realize cross coupling between cross resonant cavities, so that a transmission zero point with stronger coupling can not be realized;
thirdly, for the filter performance that the near-end rejection is high, the zero requirement is high, and the transmission zero is asymmetric left and right, for example, the zero is high left and low right, and high left and low right, the existing structure can not meet the requirement.
Disclosure of Invention
The invention aims to provide a dielectric waveguide filter which adopts a topological structure realized by a novel negative coupling structure, has simple and novel structure, is accurate and efficient, ensures various performance indexes, meets higher use requirements, better meets the modernization requirements and has stronger practicability.
In order to achieve the purpose, the invention adopts the technical scheme that: a dielectric waveguide filter comprises a dielectric block, a resonant cavity group, an input port, an output port and a negative coupling hole structure, wherein a layer of metal silver is covered on the surface of the dielectric block, the input port and the output port are arranged on the surface of one side of the dielectric block in parallel, the resonant cavity group is arranged on the dielectric block, a plurality of special-shaped groove structures penetrating through the end face of the dielectric block are sequentially arranged on the end face of the dielectric block along the length direction, the resonant cavity group comprises a plurality of resonant cavities which are dispersedly distributed on the upper side and the lower side of the special-shaped groove structures, the negative coupling hole structures are selectively distributed at the peripheral positions of each special-shaped groove structure, the special-shaped groove structures are used for adjusting the coupling amount between the adjacent resonant cavities, and the negative coupling hole structures are used for adjusting the cross;
a plurality of frequency modulation blind holes for adjusting the frequency of the filter are also selectively distributed on the upper side and the lower side of the plurality of special-shaped groove structures, and the height of the negative coupling hole structure is 1.2-2 times of that of the frequency modulation blind holes.
Furthermore, the special-shaped groove structure is a special-shaped penetrating structure which is formed by any one or more of a special-shaped groove, a blind hole and a through hole and penetrates through the end face of the dielectric block.
Further, the irregular grooves include, but are not limited to, T-shaped grooves, multi-layer sinking grooves, cross-shaped grooves and Z-shaped grooves.
Further, the negative coupling hole structure is a special-shaped penetrating or non-penetrating structure composed of any one or more of a groove, a blind hole and a through hole.
Further, the surface of the dielectric block is covered by a method including, but not limited to, silver spraying, vacuum silver plating, silver electroplating, and silver water plating.
Furthermore, the input port and the output port are cylindrical blind holes.
Further, the dielectric material of the waveguide filter includes, but is not limited to, ceramic and plastic.
Compared with the prior art, the invention has the beneficial effects that: the dielectric waveguide filter has the advantages of simple and novel structure, accuracy and high efficiency, ensures various performance indexes, meets higher use requirements, better meets the modernization requirements, and has stronger practicability. The method has the following advantages:
firstly, a topological structure of a new negative coupling structure is adopted, and a plurality of cross coupling structures are easy to realize by the scattered resonant cavities;
secondly, the coupling structure is a special-shaped groove structure which is sequentially arranged along the length direction of the dielectric block, and the grooves are flexibly arranged, so that the coupling effect among various cavities is realized, and a filter with asymmetrical left and right transmission zeros is realized;
thirdly, the coupling structure of adjacent resonant cavities can be realized, the cross coupling structure of non-adjacent cavities can also be realized, namely, the cross coupling between cross resonant cavities is realized, the problem that the transmission zero point with stronger coupling can not be realized is avoided, and the whole structure is stable and reliable.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic diagram of the distribution of the negative coupling hole structure in the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 4 is a rear view of the present invention;
FIG. 5 is a schematic plan view and a schematic sectional view of various combinations of the irregular groove structure in the embodiment;
FIG. 6 is a schematic plan and cross-sectional view of a negative coupling aperture structure in an embodiment;
the labels in the figure are: 1. a dielectric block, 21, a first irregular groove structure, 22, a second irregular groove structure, 23, a third irregular groove structure, 24, a fourth irregular groove structure, 31, a first negative coupling hole structure, 32, a first frequency modulation blind hole, 33, a second frequency modulation blind hole, 34, a third frequency modulation blind hole, 35, a second negative coupling hole structure, 36, a third negative coupling hole structure, 37, a fourth negative coupling hole structure, 38, a fifth negative coupling hole structure, 39, a sixth negative coupling hole structure, 40, a seventh negative coupling hole structure, 41, an eighth negative coupling hole structure, 42, a ninth negative coupling hole structure, 43, a tenth negative coupling hole structure, 44, an eleventh negative coupling hole structure, 45, a twelfth negative coupling hole structure, 61, an input port, 62, and an output port.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
A dielectric waveguide filter comprises a dielectric block, a resonant cavity group, an input port, an output port and a negative coupling hole structure, wherein a layer of metal silver is covered on the surface of the dielectric block, the input port and the output port are arranged on the surface of one side of the dielectric block in parallel, the resonant cavity group is arranged on the ceramic dielectric block, a plurality of special-shaped groove structures penetrating through the end face of the dielectric block are sequentially arranged on the end face of the dielectric block along the length direction, the resonant cavity group comprises a plurality of resonant cavities which are dispersedly distributed on the upper side and the lower side of the special-shaped groove structures, the negative coupling hole structures are selectively distributed at the peripheral positions of each special-shaped groove structure, the special-shaped groove structures are used for adjusting the coupling amount between the adjacent resonant cavities, and the negative coupling hole structures are used for adjusting the cross;
a plurality of frequency modulation blind holes for adjusting the frequency of the filter are also selectively distributed on the upper side and the lower side of the plurality of special-shaped groove structures, and the height of the negative coupling hole structure is 1.2-2 times of that of the frequency modulation blind holes.
According to the scheme, the special-shaped groove structure is a special-shaped penetrating structure which is formed by any one or more of a special-shaped groove, a blind hole and a through hole and penetrates through the end face of the dielectric block.
Further optimize this scheme, dysmorphism groove includes but not limited to T type groove, the heavy groove of multilayer, cross slotted hole and Z type slotted hole.
According to the scheme, the negative coupling hole structure is a special-shaped penetrating or non-penetrating structure formed by any one or more of grooves, blind holes and through holes.
Further optimizing the scheme, the surface covering mode of the dielectric block comprises but is not limited to silver spraying, vacuum silver plating, silver electroplating and water silver plating.
According to the scheme, the input port and the output port are cylindrical blind holes.
Further optimizing the present solution, the dielectric material of the waveguide filter includes, but is not limited to, ceramic and plastic.
The invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1 to 4, a dielectric waveguide filter, which adopts a new topology of negative coupling structure, is arranged with resonant cavities that easily realize a plurality of cross-coupling structures, the resonant cavity comprises a ceramic dielectric block 1, a resonant cavity group, an input port 61, an output port 62 and a negative coupling hole structure, wherein a layer of metal silver is covered on the surface of the dielectric block 1, the input port 61 and the output port 62 are arranged on the surface of one side of the dielectric block in parallel, the resonant cavity group is arranged on the dielectric block, and the end surface of the dielectric block is sequentially provided with a plurality of special-shaped groove structures penetrating through the end surface of the dielectric block along the length direction, the resonant cavity group comprises a plurality of resonant cavities distributed on the upper and lower sides of the plurality of special-shaped groove structures, wherein, the resonant cavities are not shown in the figure because the resonant cavities are arranged in a conventional manner in the art. The negative coupling hole structures are selectively distributed at the peripheral positions of each special-shaped groove structure, the special-shaped groove structures are used for adjusting the coupling amount between adjacent resonant cavities, and the negative coupling hole structures are used for realizing adjustment of cross coupling amount;
the upper side and the lower side of the special-shaped groove structures are also selectively provided with a plurality of frequency modulation blind holes for adjusting the frequency of the filter, the height of the negative coupling hole structure is 1.2-2 times of the height of the frequency modulation blind holes, and it needs to be noted that the height of the existing negative coupling hole structure is generally higher, is several times of the height of the frequency modulation blind holes, has higher requirement on the thickness of a medium plate, and is not beneficial to the miniaturization of the filter.
According to the scheme, the special-shaped groove structure is a special-shaped penetrating structure which is formed by any one or more of a special-shaped groove, a blind hole and a through hole and penetrates through the end face of the dielectric block, and further, the special-shaped groove comprises but is not limited to a T-shaped groove, a multilayer sink groove, a cross-shaped groove hole and a Z-shaped groove hole, the special-shaped groove structure is flexibly arranged, the coupling effect among various cavities is realized, and therefore a filter with asymmetrical left and right transmission zeros is realized;
according to the scheme, the negative coupling hole structure is a special-shaped penetrating or non-penetrating structure formed by any one or more of grooves, blind holes and through holes.
Further optimizing the scheme, the surface covering mode of the medium block comprises but is not limited to silver spraying, vacuum silver plating, silver electroplating and water silver plating.
According to the scheme, the input port and the output port are cylindrical blind holes, the parts around the blind holes are not covered by the silver layer and are feed pins or low-pass connection pads, and the areas of the parts which are not covered by the silver layer are related to the resonant frequency of the dielectric resonant cavity where the debugging holes are located.
Further optimizing the present solution, the dielectric material of the waveguide filter includes, but is not limited to, ceramic and plastic.
In this embodiment, the special-shaped groove structure may specifically adopt the following structure, specifically as shown in fig. 5, (1) a special-shaped groove penetrating structure; (2) a penetrating structure formed by the blind holes and the through holes or a plurality of layers of blind holes; (3) a penetrating structure formed by the multilayer sink groove and the groove; (4) a penetrating structure formed by the groove and the sinking non-blind hole; (5) a penetrating structure formed by non-blind holes or special-shaped holes; (6) the cross slot hole and the Z-shaped slot hole form a penetrating structure.
Compared with a linear groove and a Z-shaped groove which are used for adjusting the coupling amount between adjacent resonant cavities, the special-shaped groove structure has the advantages that the structure is more variable, and the adaptability is stronger, so that the adjustment of the coupling amount between the adjacent resonant cavities can be more flexibly realized by using the special-shaped groove structure.
The negative coupling hole structure can specifically adopt the following structure, specifically as shown in fig. 6, (1) a multilayer blind hole + a through hole or an opposite-nature through hole + a special-shaped multilayer blind hole; (2) multilayer blind holes and special-shaped multilayer blind holes; (3) blind holes + grooves or special-shaped blind holes + special-shaped grooves; (4) blind holes and through holes; (5) non-blind holes and special-shaped blind holes; (6) multilayer blind hole + through-hole + groove or dysmorphism groove.
Compared with a linear groove and a Z-shaped groove which are used for adjusting the cross coupling amount, the negative coupling hole structure is more flexible and changeable in structure, and can be combined and arranged according to needs, so that the cross coupling amount can be adjusted more flexibly.
The technical scheme of the invention can realize the adjacent cavity coupling structure and the non-adjacent cavity cross coupling structure, namely, the cross coupling between the cross resonant cavities is realized, the problem that the transmission zero point with stronger coupling can not be realized is avoided, and the whole structure is stable and reliable.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a dielectric waveguide filter, includes dielectric block, resonant cavity group, input port, output port and negative coupling pore structure, the surface cover of dielectric block is equipped with one deck metallic silver, the parallel arrangement on the surface of dielectric block one side have input port and output port, its characterized in that:
the resonant cavity group is arranged on the dielectric block, a plurality of special-shaped groove structures penetrating through the end face of the dielectric block are sequentially arranged on the end face of the dielectric block along the length direction, the resonant cavity group comprises a plurality of resonant cavities which are dispersedly distributed on the upper side and the lower side of the special-shaped groove structures, a plurality of negative coupling hole structures are selectively distributed at the peripheral positions of each special-shaped groove structure, the special-shaped groove structures are used for adjusting the coupling amount between the adjacent resonant cavities, and the negative coupling hole structures are used for realizing the adjustment of the cross coupling amount;
a plurality of frequency modulation blind holes for adjusting the frequency of the filter are also selectively distributed on the upper side and the lower side of the plurality of special-shaped groove structures, and the height of the negative coupling hole structure is 1.2-2 times of that of the frequency modulation blind holes.
2. A dielectric waveguide filter according to claim 1, wherein: the special-shaped groove structure is a special-shaped penetrating structure which is formed by any one or more of a special-shaped groove, a blind hole and a through hole and penetrates through the end face of the dielectric block.
3. A dielectric waveguide filter according to claim 2, wherein: the special-shaped groove comprises but is not limited to a T-shaped groove, a multi-layer sinking groove, a cross-shaped groove hole and a Z-shaped groove hole.
4. A dielectric waveguide filter according to claim 1, wherein: the negative coupling hole structure is a special-shaped penetrating or non-penetrating structure consisting of any one or more of a groove, a blind hole and a through hole.
5. A dielectric waveguide filter according to claim 1, wherein: the surface of the dielectric block is covered by silver spraying, vacuum silver plating, electroplating silver and water silver plating.
6. A dielectric waveguide filter according to claim 1, wherein: the input port and the output port are cylindrical blind holes.
7. A dielectric waveguide filter according to any one of claims 1 to 6, wherein: the dielectric materials of the waveguide filter include, but are not limited to, ceramics and plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212443.2A CN111313131A (en) | 2020-03-24 | 2020-03-24 | Dielectric waveguide filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212443.2A CN111313131A (en) | 2020-03-24 | 2020-03-24 | Dielectric waveguide filter |
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| CN111313131A true CN111313131A (en) | 2020-06-19 |
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| CN202010212443.2A Pending CN111313131A (en) | 2020-03-24 | 2020-03-24 | Dielectric waveguide filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213974A (en) * | 2021-03-29 | 2021-08-06 | 无锡市高宇晟新材料科技有限公司 | Method for metallizing silver coating on dielectric device and dielectric device |
| WO2022126393A1 (en) * | 2020-12-15 | 2022-06-23 | 华为技术有限公司 | Dielectric filter, transceiver, and base station |
| WO2022203567A1 (en) * | 2021-03-24 | 2022-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Port coupling for wide band ceramic waveguide filter unit |
-
2020
- 2020-03-24 CN CN202010212443.2A patent/CN111313131A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126393A1 (en) * | 2020-12-15 | 2022-06-23 | 华为技术有限公司 | Dielectric filter, transceiver, and base station |
| WO2022203567A1 (en) * | 2021-03-24 | 2022-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Port coupling for wide band ceramic waveguide filter unit |
| CN113213974A (en) * | 2021-03-29 | 2021-08-06 | 无锡市高宇晟新材料科技有限公司 | Method for metallizing silver coating on dielectric device and dielectric device |
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