CN112164850A - High-stability laminated ceramic dielectric filter - Google Patents
High-stability laminated ceramic dielectric filter Download PDFInfo
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- CN112164850A CN112164850A CN202011191427.6A CN202011191427A CN112164850A CN 112164850 A CN112164850 A CN 112164850A CN 202011191427 A CN202011191427 A CN 202011191427A CN 112164850 A CN112164850 A CN 112164850A
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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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Abstract
The invention discloses a high-stability laminated ceramic dielectric filter which comprises a first dielectric resonator body and a second dielectric resonator body which are arranged in an up-down laminated mode, wherein a boss is arranged on the lower surface of the first dielectric resonator body, a demetallized first annular strip is arranged on the boss, and a demetallized second annular strip is arranged on the upper surface of the second dielectric resonator body. The invention reduces the flatness difference between the dielectric resonator bodies by arranging the lug bosses on the dielectric resonator bodies, improves the stability of the coupling bandwidth of the laminated ceramic dielectric filter, reduces the manufacturing difficulty and cost, and has high manufacturing pass rate and excellent and stable performance.
Description
Technical Field
The invention relates to the field of ceramic filters, in particular to a laminated ceramic dielectric filter with high stability.
Background
With the continuous development of communication technology, the miniaturization requirement of base station equipment is higher and higher, and the miniaturization of filters is also important, the conventional metal filters are difficult to meet the current miniaturization requirement, and particularly have wide application in 5G communication, and with the higher requirement on miniaturization, the filter technology with small size, high performance, high power and low cost is particularly important for filters in wireless communication application.
The ceramic waveguide filter has the advantages of good performance, small volume and light weight, but in the current ceramic waveguide filter industry, the number of the superimposed products of the ceramic waveguide filter is small, mainly because of the manufacturing difficulty and the low yield, however, the reason for causing the above problems is that the superimposed products can involve the coupling problem in the signal transmission, generally speaking, the larger the distance between the ceramic filters is, the smaller the coupling bandwidth of the products is, and the worse the performance of the products is.
The ceramic product can cause the bending of the surface due to the uniform difference of the density during the pressing, sintering and forming, and the larger the area of the product is, the larger the bending degree is, thereby increasing the distance between the ceramic filters, so that the bending degree directly influences the coupling strength of signals, and the consistency of the product performance is poor.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a laminated ceramic dielectric filter with high stability, which can solve the problem of large coupling bandwidth fluctuation of a laminated ceramic filter caused by large flatness difference. The specific technical scheme is as follows:
the invention provides a high-stability laminated ceramic dielectric filter, which comprises a first dielectric resonator body and a second dielectric resonator body which are arranged in an up-down laminated mode, wherein the first dielectric resonator body and the second dielectric resonator body are both made of ceramic materials with metalized surfaces;
the lower surface of the first dielectric resonator body is provided with at least one boss, and the surface of the boss is of a metallization structure;
the surface of the boss is provided with a demetallized first annular strip, the upper surface of the second dielectric resonator body is provided with a demetallized second annular strip, and the first annular strip and the second annular strip are nested to form a coupling window when the second dielectric resonator body and the second boss are in a joint state.
Furthermore, a gap region exists between the first dielectric resonator body and the second dielectric resonator body except for the joint region of the boss and the second dielectric resonator body, and the gap region is filled with a metalized material.
Further, the number of the first annular strips is multiple and is arranged in a nesting mode, and/or the number of the second annular strips is multiple and is arranged in a nesting mode.
Further, the nesting of the first and second circumferential strips is arranged to: a second annular strip is embedded between two adjacent first annular strips, and/or,
a first annular strip is embedded between two adjacent second annular strips.
Further, the first annular strip and the second annular strip are arranged adjacently at equal intervals.
Further, the number of the first annular strips and the number of the second annular strips are multiple, and the distance between the adjacent first annular strips and the adjacent second annular strips is gradually increased in the direction from the center of the coupling window to the outside.
Further, the central vertical axis of the first annular strip coincides with the central vertical axis of the second annular strip.
Further, the boss and the first dielectric resonator body are of an integrally formed structure.
Furthermore, the first dielectric resonator body is further provided with at least one upper frequency hole for debugging the resonant frequency, the second dielectric resonator body is further provided with at least one lower frequency hole for debugging the resonant frequency, and the upper frequency hole and the lower frequency hole are both of blind hole structures with metalized inner walls.
Furthermore, a first signal transmission hole with a blind hole structure is further formed in the first dielectric resonator body, a second signal transmission hole with a blind hole structure is further formed in the second dielectric resonator body, and metal layers are covered on the bottom wall and the side wall of each of the first signal transmission hole and the second signal transmission hole.
The technical scheme of the invention has the beneficial effects that:
a. a boss with a smaller area is added at the coupling position of the laminated surfaces of the two ceramic blocks, so that the fluctuation range of the flatness is reduced, the distance between the coupling positions is reduced, and the coupling bandwidth is improved;
b. the small-size boss can meet the requirement of the coupling bandwidth, so that the superposition ceramic filter can be large-sized, and the manufacturing difficulty and cost are reduced;
c. the laminated ceramic dielectric filter has excellent and stable performance and high pass rate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic perspective view of a stacked ceramic dielectric filter with high stability according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of a high stability laminated ceramic dielectric filter provided by an embodiment of the present invention;
FIG. 3 is a graphical representation of the coupling bandwidth versus spacing for a laminated ceramic dielectric filter;
FIG. 4 shows the frequency bandwidth of the laminated ceramic dielectric filter at a spacing of 0.1 mm;
FIG. 5 shows the frequency bandwidth of the laminated ceramic dielectric filter at a spacing of 0.02 mm;
fig. 6 is a table illustrating the performance simulation results of the stacked ceramic dielectric filter with high stability according to the embodiment of the present invention.
Wherein the reference numbers are as follows: 1-a first dielectric resonator body, 11-a boss, 1101-a first annular strip, 12-an upper frequency hole, 13-a first signal transmission hole, 14-a second upper frequency hole, 2-a second dielectric resonator body, 21-a second annular strip, 22-a lower frequency hole, 23-a second signal transmission hole, 24-a second lower frequency hole.
Detailed Description
In order to make the technical solutions of the present invention better understood and more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment of the present invention, referring to fig. 1, a high-stability laminated ceramic dielectric filter is provided, which includes a first dielectric resonator body 1 and a second dielectric resonator body 2 stacked one above the other, where the first dielectric resonator body 1 and the second dielectric resonator body 2 are both made of a ceramic material with a metallized surface;
the lower surface of the first dielectric resonator body 1 is provided with at least one boss 11, and the surface of the boss 11 is of a metallization structure.
In a preferred embodiment of the present invention, the boss 11 is formed integrally with the first dielectric resonator body 1.
The ceramic material can generate a certain slope of bending when being manufactured and sintered, but because the area of the lug bosses is small, the change of the distance between the two lug bosses caused by the change of the flatness is small, and the adverse effect of the flatness difference of the upper lamination layer and the lower lamination layer of the laminated ceramic dielectric filter on the stability of the coupling bandwidth can be weakened. Fig. 3 reveals the relationship between the coupling bandwidth and the spacing between the dielectric resonators, and fig. 4 and 5 more intuitively represent the difference between the good performance of the ceramic waveguide filter with the smaller stack spacing and the poor performance of the ceramic waveguide filter with the larger stack spacing. Therefore, the laminated ceramic dielectric filter of the embodiment of the present invention can obtain a more stable coupling bandwidth than the laminated ceramic dielectric filter without the boss 11. The boss can be in any form, the position and the area of the boss are defined according to actual design requirements, and the height of the boss is set to be larger than the flatness of the surface of a product so as to ensure that the boss can be in contact with the surface of another dielectric resonator.
In a preferred embodiment of the present invention, a gap region exists between the first dielectric resonator body 1 and the second dielectric resonator body 2 except for a region where the boss 11 is attached to the second dielectric resonator body 2, as shown in fig. 2, and the gap region is filled with a metalized material, that is, a gap between the two dielectric resonator bodies is a gap between the boss and the second dielectric resonator body, because the area of the boss is smaller than the area of the body, a difference in flatness between the upper surfaces of the boss 11 and the second dielectric resonator is much smaller than a difference in surface flatness between the stacked surfaces of the two dielectric resonator bodies without the boss 11, so that a coupling bandwidth between the two dielectric resonator bodies is more stable, as can be further understood from comparison between fig. 4 and fig. 5, the smaller the gap is, the larger the coupling bandwidth is, in summary, in an embodiment of the present invention, the boss is used to reduce the gap between the two dielectric resonator bodies The stability of the wave filter is stronger.
In a preferred embodiment of the present invention, a demetallized first annular strip 1101 is disposed on the surface of the boss 11, a demetallized second annular strip 21 is disposed on the upper surface of the second dielectric resonator body 2, and when the boss 11 and the second dielectric resonator body 2 are in a fitted state, the first annular strip 1101 and the second annular strip 21 are nested to form a coupling window.
In particular, the first annular strips 1101 are in a plurality and nested arrangement, and/or the second annular strips 21 are in a plurality and nested arrangement.
More specifically, the nesting of said first annular strip 1101 with said second annular strip 21 is arranged: and a second annular strip is embedded between two adjacent first annular strips, and/or a first annular strip is embedded between two adjacent second annular strips. For example, taking three first ring bars and three second ring bars as an example (not shown), the first ring bars from small to large are numbered as 1, 3, and 5, and the second ring bars from small to large are numbered as 2, 4, and 6, so that the numbers of the ring bars from inside to outside in the formed coupling window are sequentially numbered as 1, 2, 3, 4, 5, and 6.
The first annular strip 1101 and the second annular strip 21 may be adjacently disposed at equal intervals, or the number of the first annular strip and the second annular strip is multiple, and the distance between the adjacent first annular strip and the adjacent second annular strip is gradually increased in the direction from the center of the coupling window to the outer edge.
In a specific embodiment of the present invention, the central vertical axis of the first annular strip 1101 coincides with the central vertical axis of the second annular strip 21. It should be noted that the shape of the first annular strip 1101 and the second annular strip 21, such as a circle, an ellipse or an irregular shape, is determined by practical needs, and the present invention is not limited thereto, as long as it is ensured that two adjacent annular strips in the coupling window 3 are not in contact.
The first dielectric resonator body 1 is further provided with at least one upper frequency hole 12 for debugging the resonant frequency, the second dielectric resonator body 2 is further provided with at least one lower frequency hole 22 for debugging the resonant frequency, and the upper frequency hole 12 and the lower frequency hole 22 are both of a blind hole structure with metalized inner walls.
The first dielectric resonator body 1 is further provided with a first signal transmission hole 13 with a blind hole structure, the second dielectric resonator body 2 is further provided with a second signal transmission hole 23 with a blind hole structure, and metal layers are covered on the bottom wall and the side wall of the first signal transmission hole 13 and the second signal transmission hole 23.
The shape, depth, inclination direction, etc. of the upper frequency hole, the lower frequency hole, the first signal transmission hole and the second signal transmission hole are not limited in the present invention.
The shape and size of the first dielectric resonator body 1 and the second dielectric resonator body 2 are not limited in the present invention, and may be similar or different.
The present invention does not limit the position and number of the bosses, and the bosses may be located on the first dielectric resonator body or on the second dielectric resonator body, and in fact, the case equivalent to "the bosses are located on the second dielectric resonator body" can be obtained by rotating the laminated ceramic dielectric filter by 180 ° along the horizontal axis, and thus such a case also falls within the scope of the present invention.
In the following, a specific embodiment of the present invention is exemplified, and it should be noted that this is only one embodiment of the present invention and does not cover all embodiments of the present invention.
The laminated ceramic dielectric filter shown in fig. 1 comprises a first dielectric resonator body 1 and a second dielectric resonator body 2 which are stacked up and down, wherein the first dielectric resonator body 1 and the second dielectric resonator body 2 are both made of ceramic materials with metallized surfaces;
the upper surface of the first dielectric resonator body 1 is provided with a first upper frequency hole 12 and a second upper frequency hole 14 which are both in a blind hole structure, and the lower surface of the first dielectric resonator body 1 is provided with two blind holes corresponding to the first upper frequency hole 12 and the second upper frequency hole 14 respectively;
a first lower frequency hole 22 and a second lower frequency hole 24 which are both in a blind hole structure are arranged on the lower surface of the second dielectric resonator body 2, and two blind holes corresponding to the first lower frequency hole 22 and the second lower frequency hole 24 respectively are arranged on the upper surface of the second dielectric resonator body 2;
the upper surface of the first dielectric resonator body 1 is also provided with a first signal transmission hole 13 with a blind hole structure, and the lower surface of the first dielectric resonator body is provided with a corresponding blind hole;
the lower surface of the second dielectric resonator body 2 is also provided with a second signal transmission hole 23 with a blind hole structure, and the upper surface is provided with a corresponding blind hole;
the above blind hole structures are all subjected to metallization treatment, and the number and positions of the specific frequency holes and signal transmission holes should not be taken as the basis for limiting the protection scope of the invention.
As shown in fig. 2, a boss 11 is provided on the lower surface of the first dielectric resonator body 1, the surface of the boss 11 is in a metallization structure, and the gap between the boss and the second dielectric resonator body 2 is narrower;
a demetallized first annular strip 1101 is arranged on the surface of the boss 11, a demetallized second annular strip 21 is arranged on the upper surface of the second dielectric resonator body 2, the boss 11 and the upper surface of the second dielectric resonator body 2 are in a fit state, and the first annular strip 1101 and the second annular strip 21 are nested to form a coupling window;
in the present embodiment, the first annular strip 1101 and the second annular strip 21 are circular in shape, the central vertical axis of the first annular strip 1101 coincides with the central vertical axis of the second annular strip 21, and the first annular strip 1101 is located more inside than the second annular strip 21.
Fig. 6 is a graph showing performance parameters of the multilayer ceramic dielectric filter according to the present embodiment, and it is apparent that the multilayer ceramic dielectric filter according to the present embodiment has excellent performance.
In summary, for the laminated ceramic waveguide filter, the boss is added at the coupling position of the laminated surfaces of the two ceramic blocks, the height and the size of the boss can be adjusted according to the actual situation, and the boss surface has small area, small flatness fluctuation range after ceramic pressing and sintering and high consistency. Therefore, the laminated ceramic dielectric filter provided by the invention can improve the coupling bandwidth, simultaneously relax the limit on the size of the ceramic dielectric filter and reduce the manufacturing difficulty and cost; the laminated ceramic dielectric filter has high pass rate, excellent and stable performance and overcomes the defects of the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A high-stability laminated ceramic dielectric filter is characterized by comprising a first dielectric resonator body (1) and a second dielectric resonator body (2) which are arranged in an up-down laminated mode, wherein the first dielectric resonator body (1) and the second dielectric resonator body (2) are both made of ceramic materials with metalized surfaces;
the lower surface of the first dielectric resonator body (1) is provided with at least one boss (11), and the surface of the boss (11) is of a metallization structure;
the surface of the boss (11) is provided with a demetallized first annular strip (1101), the upper surface of the second dielectric resonator body (2) is provided with a demetallized second annular strip (21), and the boss (11) and the second dielectric resonator body (2) are in a fit state, the first annular strip (1101) and the second annular strip (21) are arranged in a nested mode to form a coupling window.
2. The laminated ceramic dielectric filter according to claim 1, wherein a gap region exists between the first dielectric resonator body (1) and the second dielectric resonator body (2) except for a region where the boss (11) is attached to the second dielectric resonator body (2), and the gap region is filled with a metallized material.
3. The laminated ceramic dielectric filter of claim 1, wherein the first annular strips (1101) are plural in number and are arranged in a nested arrangement, and/or,
the number of the second annular strips (21) is multiple and is nested.
4. The laminated ceramic dielectric filter of claim 3 wherein the nesting of the first (1101) and second (21) annular strips is arranged to: a second annular strip (21) is embedded between two adjacent first annular strips (1101), and/or,
a first annular strip (1101) is embedded between two adjacent second annular strips (21).
5. The high stability laminated ceramic dielectric filter of claim 3 wherein said first annular strip is disposed adjacent to said second annular strip at equal intervals.
6. The high-stability laminated ceramic dielectric filter according to claim 3, wherein the first annular strip (1101) and the second annular strip (21) are provided in a plurality, and the distance between the adjacent first annular strip (1101) and the adjacent second annular strip (21) becomes gradually larger in the direction from the center of the coupling window to the outside.
7. The laminated ceramic dielectric filter of claim 1 wherein a central vertical axis of the first annular strip (1101) coincides with a central vertical axis of the second annular strip (21).
8. The laminated ceramic dielectric filter of claim 1 wherein said boss (11) is of unitary construction with the first dielectric resonator body (1).
9. The laminated ceramic dielectric filter according to claim 1, wherein the first dielectric resonator body (1) is further provided with at least one upper frequency hole (12) for tuning a resonant frequency, the second dielectric resonator body (2) is further provided with at least one lower frequency hole (22) for tuning a resonant frequency, and the upper frequency hole (12) and the lower frequency hole (22) are both of a blind hole structure with metalized inner walls.
10. The laminated ceramic dielectric filter according to claim 1, wherein the first dielectric resonator body (1) is further provided with a first signal transmission hole (13) having a blind via structure, the second dielectric resonator body (2) is further provided with a second signal transmission hole (23) having a blind via structure, and bottom walls and side walls of the first signal transmission hole (13) and the second signal transmission hole (23) are covered with metal layers.
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| CN202011191427.6A CN112164850A (en) | 2020-10-30 | 2020-10-30 | High-stability laminated ceramic dielectric filter |
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| CN202011191427.6A CN112164850A (en) | 2020-10-30 | 2020-10-30 | High-stability laminated ceramic dielectric filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787054A (en) * | 2021-01-07 | 2021-05-11 | 苏州市协诚微波技术有限公司 | Low-loss ceramic dielectric filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787054A (en) * | 2021-01-07 | 2021-05-11 | 苏州市协诚微波技术有限公司 | Low-loss ceramic dielectric filter |
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