CN212062642U - Dielectric filter coupling conversion structure and communication equipment - Google Patents
Dielectric filter coupling conversion structure and communication equipment Download PDFInfo
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- CN212062642U CN212062642U CN202021077844.3U CN202021077844U CN212062642U CN 212062642 U CN212062642 U CN 212062642U CN 202021077844 U CN202021077844 U CN 202021077844U CN 212062642 U CN212062642 U CN 212062642U
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Abstract
The utility model discloses a dielectric filter coupling conversion structure, which comprises a ceramic dielectric body, wherein the ceramic dielectric body is provided with a resonance hole and a coupling blind hole, at least one resonance hole is a resonance through hole, and other resonance holes are resonance through holes or resonance blind holes; forming a metal shielding layer on the surface of the ceramic dielectric body, the inner wall of each resonant hole, the side wall of the coupling blind hole and the bottom of the hole through metallization treatment, wherein an isolation region is arranged on the inner wall of the resonant through hole; the utility model also discloses a communication equipment. In the utility model, the resonance frequency and the coupling size can be adjusted by adjusting the sizes of the coupling blind hole and the resonance hole, the coupling polarity can be conveniently converted by setting the stepped resonance through hole, the cross coupling is realized in the dielectric filter, and the stop band inhibition is improved; the higher-order mode resonant frequency of the filter can be changed, so that the attenuation of far-end parasitic is increased; the processing technology is simple and convenient to realize.
Description
Technical Field
The utility model relates to a dielectric filter field, in particular to dielectric filter coupling transform structure and communication equipment.
Background
Filters are indispensable electronic components in microwave communication systems, and their performance determines the quality of the communication system. With the arrival of 5G communication technology, the number of 5G base station antenna ports is increased from the traditional 8 ports to 64 ports and 128 ports, and the requirement of a filter is greatly increased. Therefore, a small-sized, lightweight, high-performance filter is produced 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.
As communication systems have higher requirements for out-of-band rejection, in order to achieve high rejection of filter stop-band, the dielectric filter usually needs to add cross-coupling to introduce transmission zero, so as to improve the filter stop-band rejection. The cross coupling is that positive coupling and negative coupling are reasonably arranged according to the topological structure of the filter, so that signals of different paths generate phase differences. In order to realize positive coupling and negative coupling in the filter at the same time, a coupling polarity switching structure needs to be introduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a structure and communication equipment convenient to realize dielectric filter just, negative coupling conversion.
The technical scheme of the utility model as follows:
a dielectric filter coupling conversion structure comprises a ceramic dielectric body, wherein at least two resonance holes and at least one coupling blind hole are formed in the ceramic dielectric body, each coupling blind hole is arranged between two adjacent resonance holes, and a coupling window is formed between the two resonance holes; at least one resonance hole is a resonance through hole, and other resonance holes are resonance through holes or resonance blind holes; and the surface of the ceramic dielectric body, the inner wall of each resonant hole, the side wall of the coupling blind hole and the bottom of the coupling blind hole are all metallized to form a metal shielding layer, and the inner wall of the resonant through hole is also provided with at least one isolation region for dividing the metal shielding layer formed on the inner wall of the resonant through hole into at least two parts.
Furthermore, at least one resonance hole is a resonance blind hole, the depth of the resonance blind hole is smaller than that of the coupling blind hole, the resonance blind hole is adjacent to a resonance through hole, at least one coupling blind hole is arranged between the resonance blind hole and the adjacent resonance through hole, a metal shielding layer is formed on the side wall and the bottom of the resonance blind hole through metallization treatment, and an isolation region is arranged at the bottom of the first resonance hole.
Further, at least two adjacent resonance holes are resonance through holes, and at least one coupling blind hole is arranged between the two adjacent resonance through holes.
Furthermore, the resonance through hole comprises a first resonance hole arranged on the bottom surface of the ceramic dielectric body and a second resonance hole arranged on the top surface of the ceramic dielectric body, the first resonance hole and the second resonance hole are communicated, and the diameter of the first resonance hole is larger than that of the second resonance hole; the side wall of the first resonance hole and the side wall of the second resonance hole are both metallized to form a metal shielding layer, an annular isolation area is arranged at the bottom of the first resonance hole, and the isolation area is used for isolating the metal shielding layer formed on the inner wall of the first resonance hole and the metal shielding layer formed on the inner wall of the second resonance hole.
Further, the resonance through hole comprises a third resonance hole formed in the bottom surface of the ceramic dielectric body, a fifth resonance hole formed in the top surface of the ceramic dielectric body, and a fourth resonance hole for communicating the third resonance hole with the fifth resonance hole, wherein the diameters of the third resonance hole and the fifth resonance hole are larger than the diameter of the fourth resonance hole; the side wall of the third resonance hole, the side wall of the fourth resonance hole, the side wall of the fifth resonance hole and the hole bottom are all metallized to form a metal shielding layer, an annular isolation region is arranged at the hole bottom of the third resonance hole, and the isolation region is used for isolating the metal shielding layer formed on the inner wall of the third resonance hole and the metal shielding layer formed on the inner wall of the fourth resonance hole.
Further, the third resonant hole and the fifth resonant hole are symmetrically arranged.
Further, the depth of the resonance blind hole is smaller than that of the coupling blind hole, and the depth of the third resonance hole is smaller than that of the resonance blind hole.
Further, the coupling blind holes are circular, rectangular, kidney-shaped or oval.
Furthermore, the coupling blind hole is formed in the bottom surface of the ceramic dielectric body.
Furthermore, the coupling blind hole is formed in the top surface of the ceramic dielectric body.
A communication device comprising a dielectric filter employing a dielectric filter coupling switching structure as claimed in any one of the above.
Has the advantages that: in the utility model, the resonance frequency and the coupling size can be adjusted by adjusting the sizes of the coupling blind hole and the resonance hole, the coupling polarity can be conveniently converted by setting the stepped resonance through hole, the cross coupling is realized in the dielectric filter, and the stop band inhibition is improved; the higher-order mode resonant frequency of the filter can be changed, so that the attenuation of far-end parasitic is increased; the processing technology is simple and convenient to realize.
Drawings
Fig. 1 is a bottom view of a coupling conversion structure of a dielectric filter according to a fifth embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to an embodiment of the present invention;
fig. 3 is a schematic diagram comparing attenuation curves of a conventional resonant blind hole coupling conversion structure according to an embodiment of the present invention;
fig. 4 is a graph of the coupling versus frequency curve according to the first embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a second embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a third embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a fourth embodiment of the present invention;
fig. 8 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a fifth embodiment of the present invention;
fig. 9 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a sixth embodiment of the present invention;
fig. 10 is a schematic cross-sectional view of a coupling conversion structure of a dielectric filter according to a seventh embodiment of the present invention.
In the figure: 1. the resonator comprises a ceramic dielectric body, 2 resonant through holes, 3 resonant blind holes, 4 coupling blind holes, 21 first resonant holes, 22 second resonant holes, 23 third resonant holes, 24 fourth resonant holes, 25 fifth resonant holes and 26 isolation regions.
Detailed Description
In order to make those skilled in the art understand the technical solutions in the embodiments of the present invention better and make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the following description of the technical solutions in the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the term "connected" is to be interpreted broadly, for example, it may be mechanically or electrically connected, or it may be connected between two elements, directly or indirectly through an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Example one
As shown in fig. 2, a dielectric filter coupling conversion structure provided by the embodiment of the present invention includes a ceramic dielectric body 1, the ceramic dielectric body 1 is provided with at least two resonant holes and at least one coupling blind hole 4, and the coupling blind hole 4 is circular, rectangular, kidney-shaped or oval. In this embodiment, it is preferable that the ceramic dielectric body 1 is provided with two resonant holes and a circular coupling blind hole 4, and certainly, the ceramic dielectric body 1 may also be provided with more resonant holes and more coupling blind holes 4, and the coupling blind holes 4 may also have other shapes. The coupling blind hole 4 is formed in the bottom surface of the ceramic dielectric body 1 and is arranged between the two resonant holes, so that a coupling window is formed between the two resonant holes.
The two resonance holes are both stepped resonance through holes 2; the resonance through hole 2 comprises a first resonance hole 21 arranged on the bottom surface of the ceramic dielectric body 1 and a second resonance hole 22 arranged on the top surface of the ceramic dielectric body 1, the first resonance hole 21 and the second resonance hole 22 are communicated, the first resonance hole 21 and the second resonance hole 22 are cylindrical through holes, and the diameter of an upper end orifice of the first resonance hole 21 is larger than that of a lower end orifice of the second resonance hole 22; forming metal shielding layers on the surface of the ceramic dielectric body 1, the side wall of the first resonant hole 21, the side wall of the second resonant hole 22, the side wall of the coupling blind hole 4 and the bottom of the coupling blind hole through metallization treatment; no metal shielding layer is disposed at the bottom of the first resonant hole 21, so as to form an annular isolation region 26, and the metal shielding layer on the inner wall of the resonant via 2 is divided into an upper part and a lower part.
The embodiment can adjust the size of the resonant frequency by adjusting the shape, the aperture and the depth of the coupling blind hole 4 and adjusting the aperture and the depth of each resonant hole. As shown in fig. 3, which is a comparison graph of attenuation curves of the resonant blind via structure and the resonant blind via structure in the present embodiment, the high-end stop band rejection is higher after the resonant via is changed to the through via. As shown in fig. 4, it can be seen that the resonant frequency of the present embodiment is well maintained for the coupling conversion structure of the present invention. In addition, in the embodiment, a plurality of resonant holes are formed in one ceramic dielectric body 1, so that the bodies of the dielectric resonators included in the dielectric filter are continuous, the dielectric filter can be obtained in an integrated forming mode, and the processing technology of the dielectric filter is simpler; and a coupling blind hole 4 is arranged between the two resonance through holes 2, so that a negative coupling mode can be realized.
Example two
As shown in fig. 5, a dielectric filter coupling conversion structure according to the second embodiment of the present invention is different from the first embodiment in that: in this embodiment, the coupling blind hole 4 is formed in the top surface of the ceramic dielectric body 1, and other structures are the same as those in the first embodiment. The working principle of the present embodiment is also the same as that of the first embodiment, and the attenuation curve and the coupling curve with frequency are similar to those of the first embodiment.
EXAMPLE III
As shown in fig. 6, a third embodiment of the present invention provides a dielectric filter coupling conversion structure, which is different from the first embodiment in that: in this embodiment, the second resonant hole 22 is a through hole with a large top and a small bottom, preferably a conical through hole with a large top and a small bottom, and of course, other through hole structures with a large top and a small bottom may be adopted, and the other structures are the same as the first embodiment. The working principle of the present embodiment is also the same as that of the first embodiment, and the attenuation curve and the coupling curve with frequency are similar to those of the first embodiment.
Example four
As shown in fig. 7, a difference between the coupling and converting structure of a dielectric filter provided in the fourth embodiment of the present invention and the first embodiment of the present invention is: the resonant via 2 is different in structure. In this embodiment, the resonance via-hole 2 includes a third resonance hole 23 opened in the bottom surface of the ceramic dielectric body 1, a fifth resonance hole 25 opened in the top surface of the ceramic dielectric body 1, and a fourth resonance hole 24 for communicating the third resonance hole 23 and the fifth resonance hole 25; the third resonance hole 23, the fourth resonance hole 24 and the fifth resonance hole 25 are all cylindrical through holes, and the third resonance hole 23 and the fifth resonance hole 25 are symmetrically arranged; the diameters of the third resonance hole 23 and the fifth resonance hole 25 are larger than the diameter of the fourth resonance hole 24; the side wall of the third resonant hole 23, the side wall of the fourth resonant hole 24, the side wall of the fifth resonant hole 25 and the bottom of the fifth resonant hole 25 are all metallized to form a metal shielding layer, and no metal shielding layer is arranged at the bottom of the third resonant hole 23, so that an annular isolation region 26 is formed, and the metal shielding layer on the inner wall of the resonant through hole 2 is divided into an upper part and a lower part. The working principle of the present embodiment is the same as that of the first embodiment, and the attenuation curve and the coupling curve with frequency are similar to those of the first embodiment.
EXAMPLE five
As shown in fig. 1 and fig. 8, a fifth embodiment of the present invention provides a dielectric filter coupling conversion structure, which is different from the first embodiment in that: in this embodiment, the two resonance holes are respectively a stepped resonance through hole 2 and a resonance blind hole 3, and the structure of the resonance through hole 2 in this embodiment is the same as that of the resonance through hole 2 in the first embodiment; the depth of the resonance blind hole 3 is smaller than that of the coupling blind hole 4, and the depth of the resonance blind hole 3 is equal to that of the first resonance hole 21. In this embodiment, the coupling blind hole 4 is disposed between the resonant through hole 2 and the resonant blind hole 3, and by replacing one resonant through hole 2 of the first embodiment with the resonant blind hole 3, the polarity of cross coupling can be changed, and the coupling mode of positive coupling is realized.
EXAMPLE six
As shown in fig. 9, a difference between the sixth embodiment of the present invention and the fifth embodiment of the present invention is that: in this embodiment, the second resonant hole 22 is a through hole with a large top and a small bottom, preferably a conical through hole with a large top and a small bottom, and of course, other through hole structures with a large top and a small bottom may be adopted, and the other structures are the same as those of the fifth embodiment. The working principle of the present embodiment is also the same as that of the fifth embodiment, and the attenuation curve and the coupling curve with frequency are similar to those of the first embodiment.
EXAMPLE seven
As shown in fig. 10, a seventh embodiment of the present invention provides a dielectric filter coupling conversion structure, which is different from the fifth embodiment in that: the resonant via 2 is different in structure. In this embodiment, the resonance via-hole 2 includes a third resonance hole 23 opened in the bottom surface of the ceramic dielectric body 1, a fifth resonance hole 25 opened in the top surface of the ceramic dielectric body 1, and a fourth resonance hole 24 for communicating the third resonance hole 23 and the fifth resonance hole 25; the third resonance hole 23, the fourth resonance hole 24 and the fifth resonance hole 25 are all cylindrical through holes, and the third resonance hole 23 and the fifth resonance hole 25 are symmetrically arranged; the diameters of the third resonance hole 23 and the fifth resonance hole 25 are larger than the diameter of the fourth resonance hole 24; the side wall of the third resonant hole 23, the side wall of the fourth resonant hole 24, the side wall of the fifth resonant hole 25 and the bottom of the fifth resonant hole 25 are all metallized to form a metal shielding layer, and no metal shielding layer is arranged at the bottom of the third resonant hole 23, so that an annular isolation region 26 is formed, and the metal shielding layer on the inner wall of the resonant through hole 2 is divided into an upper part and a lower part. The working principle of the present embodiment is the same as that of the fifth embodiment, and the attenuation curve and the coupling curve with frequency are similar to those of the first embodiment.
Can see through seven embodiments above, the utility model discloses a coupling mode of negative coupling can be realized to the resonance through-hole 2 of two echelonments, and the coupling mode of positive coupling can be realized to the resonance through-hole 2 and a resonance blind hole 3 that adopt a echelonment, and the transform of realization coupling polarity that can be convenient through the resonance through-hole 2 that sets up the echelonment, the utility model discloses resonant frequency's retentivity is good to the high-end stop band restraines higher.
Example eight
This embodiment provides a communication device including a dielectric filter that employs a dielectric filter coupling conversion structure as described in any of the above embodiments. The communication device may be a passive communication device such as an antenna, or an active communication device such as a transceiver.
The utility model discloses do not describe the part unanimously with prior art, do not describe herein any more.
The above is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent structures made by the contents of the specification and the drawings are directly or indirectly applied to other related technical fields, all the same principle is within the patent protection scope of the present invention.
Claims (10)
1. A dielectric filter coupling conversion structure comprises a ceramic dielectric body, and is characterized in that at least two resonance holes and at least one coupling blind hole are arranged on the ceramic dielectric body, each coupling blind hole is respectively arranged between two adjacent resonance holes, and a coupling window is formed between the two resonance holes; at least one resonance hole is a resonance through hole, and other resonance holes are resonance through holes or resonance blind holes; and the surface of the ceramic dielectric body, the inner wall of each resonant hole, the side wall of the coupling blind hole and the bottom of the coupling blind hole are all metallized to form a metal shielding layer, and the inner wall of the resonant through hole is also provided with at least one isolation region for dividing the metal shielding layer formed on the inner wall of the resonant through hole into at least two parts.
2. A dielectric filter coupling conversion structure according to claim 1, wherein at least two adjacent resonance holes are resonance through holes, and at least one coupling blind hole is provided between two adjacent resonance through holes.
3. The dielectric filter coupling conversion structure of claim 1, wherein at least one of the resonant holes is a resonant blind hole, the depth of the resonant blind hole is smaller than the depth of the coupling blind hole, the resonant blind hole is adjacent to a resonant through hole, at least one of the coupling blind holes is disposed between the resonant blind hole and the adjacent resonant through hole, and a metal shielding layer is formed on the sidewall and the bottom of the resonant blind hole by metallization.
4. The dielectric filter coupling conversion structure of claim 1, wherein the resonance via holes include a first resonance hole opened on a bottom surface of the ceramic dielectric body and a second resonance hole opened on a top surface of the ceramic dielectric body, the first resonance hole and the second resonance hole are arranged in communication, and an upper end orifice diameter of the first resonance hole is larger than a lower end orifice diameter of the second resonance hole; the side wall of the first resonance hole and the side wall of the second resonance hole are both metallized to form a metal shielding layer, an annular isolation area is arranged at the bottom of the first resonance hole, and the isolation area is used for isolating the metal shielding layer formed on the inner wall of the first resonance hole and the metal shielding layer formed on the inner wall of the second resonance hole.
5. The dielectric filter coupling converting structure of claim 4, wherein said first resonance hole and said second resonance hole are cylindrical through holes.
6. The coupled structure of claim 4, wherein the first resonant hole is a cylindrical through hole, and the second resonant hole is a conical through hole with a large top and a small bottom.
7. The dielectric filter coupling conversion structure of claim 1, wherein the resonance through holes include a third resonance hole formed in a bottom surface of the ceramic dielectric body, a fifth resonance hole formed in a top surface of the ceramic dielectric body, and a fourth resonance hole for communicating the third resonance hole with the fifth resonance hole, the third resonance hole, the fourth resonance hole, and the fifth resonance hole are all cylindrical through holes, and diameters of the third resonance hole and the fifth resonance hole are larger than a diameter of the fourth resonance hole; the side wall of the third resonance hole, the side wall of the fourth resonance hole, the side wall of the fifth resonance hole and the hole bottom are all metallized to form a metal shielding layer, an isolation region is arranged at the hole bottom of the third resonance hole and used for isolating the metal shielding layer formed on the inner wall of the third resonance hole and the metal shielding layer formed on the inner wall of the fourth resonance hole.
8. The dielectric filter coupling conversion structure of claim 1, wherein the coupling blind holes are circular, rectangular, kidney-shaped or oval.
9. The dielectric filter coupling conversion structure of claim 8, wherein the coupling blind via is formed on a bottom surface or a top surface of the ceramic dielectric body.
10. A communication device comprising a dielectric filter, wherein the dielectric filter employs a dielectric filter coupling switching structure as claimed in any one of claims 1 to 9.
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| CN202021077844.3U CN212062642U (en) | 2020-06-12 | 2020-06-12 | Dielectric filter coupling conversion structure and communication equipment |
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| CN202021077844.3U CN212062642U (en) | 2020-06-12 | 2020-06-12 | Dielectric filter coupling conversion structure and communication equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509339A (en) * | 2020-06-12 | 2020-08-07 | 中国电子科技集团公司第二十六研究所 | Dielectric filter coupling conversion structure and communication equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509339A (en) * | 2020-06-12 | 2020-08-07 | 中国电子科技集团公司第二十六研究所 | Dielectric filter coupling conversion structure and communication equipment |
| CN111509339B (en) * | 2020-06-12 | 2024-03-12 | 中国电子科技集团公司第二十六研究所 | Medium filter coupling conversion structure and communication equipment |
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