CN112072240B - Dielectric waveguide filter and manufacturing method thereof - Google Patents
Dielectric waveguide filter and manufacturing method thereof Download PDFInfo
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- CN112072240B CN112072240B CN202010892035.6A CN202010892035A CN112072240B CN 112072240 B CN112072240 B CN 112072240B CN 202010892035 A CN202010892035 A CN 202010892035A CN 112072240 B CN112072240 B CN 112072240B
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
Abstract
The invention provides a dielectric waveguide filter and a manufacturing method thereof, relating to the field of filters. The dielectric waveguide filter comprises a dielectric body, a first frequency modulation blind hole and a second frequency modulation blind hole which are arranged on the dielectric body, and a negative coupling structure arranged on the dielectric body, wherein the negative coupling structure is positioned between the first frequency modulation blind hole and the second frequency modulation blind hole, and a conductive layer is arranged on the surface of the dielectric body; the negative coupling structure comprises a negative coupling blind hole, a negative coupling blind groove and a communicating hole, the axial direction of the negative coupling blind hole is parallel to the axial direction of the first frequency modulation blind hole and the axial direction of the second frequency modulation blind hole, the negative coupling blind groove is arranged on the opposite side of the medium body back to the negative coupling blind hole, the communicating hole is connected between the negative coupling hole and the negative coupling blind groove, and the inner wall of the communicating hole is provided with an insulating ring area. When the overall dimension of the communication hole changes, the shape and dimension of the channel for signal propagation and the insulating ring area change simultaneously, so that the coupling quantity can be adjusted in a wider range, and the performance of the whole filter is better.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a dielectric waveguide filter and a manufacturing method thereof.
Background
In the communications industry, base stations are a key device in the overall mobile communications system, and the products thereof are updated on a rapid basis. The filter in the base station is an element for selecting a radio wave of a specific frequency and suppressing a radio wave of another frequency.
The traditional metal cavity filter cannot meet the requirements of miniaturization, low cost, high integration degree, high Q value and the like, and particularly cannot meet the more severe inhibition requirement of the 5G technology. Then, a novel filter with a transmission zero point is developed, for example, chinese utility model patent with publication number CN210468049U and publication number 2020.05.05 discloses a capacitive coupling structure, a dielectric filter, a communication antenna and a base station, and specifically discloses that the capacitive coupling structure of the dielectric filter includes a solid dielectric body, at least two first blind holes for adjusting resonant frequency are provided on the solid dielectric body, the first blind holes and the solid dielectric filled around the first blind holes form a dielectric resonator, and a negative coupling structure for realizing capacitive coupling of the two dielectric resonators is provided between two adjacent first blind holes; the negative coupling structure comprises a second blind hole and an open slot which are arranged on the solid medium body, at least one end of the two ends of the open slot is of an open structure, and the surface of the solid medium body, the surface of the first blind hole, the surface of the second blind hole and the surface of the open slot are all covered with conductor metal layers. The second blind hole can be processed into a shallow blind hole, the process is easy to control, the rejection rate can be effectively reduced, and the performance of the capacitive coupling structure and the performance of the dielectric filter are ensured.
In the dielectric filter in the prior art, a negative coupling structure of a second blind hole and an open slot is adopted, so that capacitive coupling of two dielectric resonators is realized. However, the coupling quantity of the negative coupling structure can be adjusted only through the shape and size of the second blind hole and the open slot, the adjustment mode of the coupling quantity of the negative coupling structure is limited, the adjustment range of the coupling quantity is small, the negative coupling structure is easily affected by interference in low-frequency-band second harmonic, and the performance of the whole filter is poor.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a dielectric waveguide filter that solves the problems that the adjustment method of the coupling amount of the negative coupling structure is limited, the adjustment range of the coupling amount is small, the filter is easily affected by interference in the second harmonic of the low frequency band, and the performance of the entire filter is poor. Meanwhile, the invention also aims to provide a manufacturing method of the dielectric waveguide filter.
The technical scheme of the dielectric waveguide filter is as follows:
the dielectric waveguide filter comprises a dielectric body, a first frequency modulation blind hole and a second frequency modulation blind hole which are arranged on the dielectric body, and a negative coupling structure arranged on the dielectric body, wherein the negative coupling structure is positioned between the first frequency modulation blind hole and the second frequency modulation blind hole, and a conductive layer is arranged on the surface of the dielectric body;
the negative coupling structure comprises a negative coupling blind hole, a negative coupling blind groove and a communication hole, the negative coupling blind hole and the negative coupling blind groove are respectively arranged on two opposite side surfaces of the medium body, and the communication hole is connected between the negative coupling blind hole and the negative coupling blind groove; the axial direction of the negative coupling blind hole is parallel to the axial direction of the first frequency modulation blind hole and the axial direction of the second frequency modulation blind hole;
and an insulating ring area surrounding the negative coupling blind hole or the negative coupling blind groove is arranged on the surface of the medium body, or an insulating ring area surrounding the communicating hole is arranged on the bottom surface of the negative coupling blind hole or the bottom surface of the negative coupling blind groove, or an insulating ring area is arranged on the inner wall of the communicating hole.
Further, the medium body is of a block structure, and the negative coupling blind hole, the first frequency modulation blind hole and the second frequency modulation blind hole are arranged on the same side of the medium body.
Further, the negative coupling blind hole and the communication hole are cylindrical holes which are coaxially arranged.
Further, the dielectric body is made of a solid dielectric material, and the solid dielectric material is a material with a fixed dielectric constant.
Further, the conducting layer is a metal layer fixedly arranged on the surface of the medium body.
Further, the thickness of the metal layer is any size between 8 μm and 20 μm.
Further, the axial dimension of the communication hole is 0.6mm or more.
Furthermore, the axial size of the negative coupling blind hole is larger than the axial sizes of the first frequency modulation blind hole and the second frequency modulation blind hole, and the diameter of the negative coupling blind hole is smaller than or equal to the diameters of the first frequency modulation blind hole and the second frequency modulation blind hole.
Further, the diameter of the communication hole is smaller than that of the negative coupling blind hole, and the diameter of the communication hole is smaller than the width of the negative coupling blind groove.
Has the advantages that: the negative coupling structure of the dielectric waveguide filter adopts the design forms of a negative coupling blind hole, a negative coupling blind groove and a communication hole, and the space of the negative coupling blind hole is communicated with the space of the negative coupling blind groove through the communication hole. And because the surface of the medium body is provided with the conducting layer and the inner wall of the communicating hole is provided with the insulating ring area, when a signal passes through the communicating hole, the electromagnetic field intensity is higher due to space compression, and the insulating ring area is designed on the inner wall of the communicating hole to play a more remarkable coupling effect.
When the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind hole, the negative coupling blind groove and the communicating hole can be adjusted before the conductive layer is formed, so that the precision of the negative coupling structure is higher; after the conductive layer is formed, the size of the shape of the communication hole can be directly changed to influence the negative coupling amount, and the adjustment mode of the coupling amount of the negative coupling structure is more. More importantly, when the overall dimension of the communication hole changes, the shape and the dimension of the channel for signal propagation and the insulating ring area change simultaneously, and compared with the filter in the prior art, on the premise of reducing subsequent processing as much as possible, the filter realizes the adjustment of coupling quantity in a wider range, thereby improving the anti-interference capability in the second harmonic of a low frequency band, and the performance of the whole filter is better.
The technical scheme of the manufacturing method of the dielectric waveguide filter is as follows:
the manufacturing method of the dielectric waveguide filter comprises the following steps:
preparing raw materials, and preparing a medium body blank with a first frequency modulation blind hole, a second frequency modulation blind hole, a negative coupling blind groove and a communicating hole;
step two, firing the green dielectric body to obtain a dielectric body;
step three, presetting a protective layer on the surface of the medium body;
fourthly, manufacturing and generating a conducting layer on the surface of the medium body in a spraying, dipping, printing or electroplating mode;
removing the protective layer to obtain an insulating ring area at a corresponding position; or, directly performing the fourth step after the second step, and then forming an insulating ring area by adopting a laser engraving mode;
and step six, adjusting the sizes of the negative coupling structure and the insulating ring area according to the performance required by the dielectric waveguide filter.
Has the advantages that: the negative coupling structure of the dielectric waveguide filter adopts the design forms of a negative coupling blind hole, a negative coupling blind groove and a communication hole, and the space of the negative coupling blind hole is communicated with the space of the negative coupling blind groove through the communication hole. And because the surface of the medium body is provided with the conducting layer and the inner wall of the communicating hole is provided with the insulating ring area, when a signal passes through the communicating hole, the electromagnetic field intensity is higher due to space compression, and the insulating ring area is designed on the inner wall of the communicating hole to play a more remarkable coupling effect.
When the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind hole, the negative coupling blind groove and the communicating hole can be adjusted before the conductive layer is formed, so that the precision of the negative coupling structure is higher; after the conductive layer is formed, the size of the shape of the communication hole can be directly changed to influence the negative coupling amount, and the adjustment mode of the coupling amount of the negative coupling structure is more. More importantly, when the overall dimension of the communication hole changes, the shape and the dimension of the channel for signal propagation and the insulating ring area change simultaneously, and compared with the filter in the prior art, on the premise of reducing subsequent processing as much as possible, the filter realizes the adjustment of coupling quantity in a wider range, thereby improving the anti-interference capability in the second harmonic of a low frequency band, and the performance of the whole filter is better.
Drawings
Fig. 1 is a partial perspective view of a dielectric waveguide filter according to an embodiment 1 of the dielectric waveguide filter of the present invention;
FIG. 2 is a schematic cross-sectional view of the dielectric waveguide filter of FIG. 1;
fig. 3 is a schematic perspective view of a dielectric waveguide filter according to embodiment 1 of the dielectric waveguide filter of the present invention;
fig. 4 is a schematic bottom view of a dielectric waveguide filter according to embodiment 1 of the dielectric waveguide filter of the present invention;
FIG. 5 is a frequency response diagram obtained by a simulation test of a negative coupling structure of a conventional filter;
fig. 6 is a frequency response diagram obtained by a simulation test of the dielectric waveguide filter in embodiment 1 of the dielectric waveguide filter according to the present invention;
fig. 7 is a schematic perspective view of a dielectric waveguide filter according to embodiment 2 of the dielectric waveguide filter of the present invention;
FIG. 8 is a schematic cross-sectional view of a dielectric waveguide filter in another embodiment of the dielectric waveguide filter of the present invention;
FIG. 9 is a schematic cross-sectional view of a dielectric waveguide filter in another embodiment of the dielectric waveguide filter of the present invention;
FIG. 10 is a schematic cross-sectional view of a dielectric waveguide filter in another embodiment of the dielectric waveguide filter of the present invention;
fig. 11 is a schematic cross-sectional view of a dielectric waveguide filter in another embodiment of the dielectric waveguide filter of the present invention.
In the figure: the tunable filter comprises a 1-dielectric waveguide filter, a 10-dielectric body, 11-a first frequency modulation blind hole, 12-a second frequency modulation blind hole, a 2-negative coupling structure, 21-a negative coupling blind hole, 22-a negative coupling blind groove, 23-a communication hole, 3-a conductive layer, 4-an insulating ring area, 13-a third frequency modulation blind hole, 130-a signal input port, 131-an input shielding ring area, 14-a fourth frequency modulation blind hole, 140-a signal output port, 141-an output shielding ring area, 15-a fifth frequency modulation blind hole, 16-a sixth frequency modulation blind hole, an A-a second harmonic interference part of the existing filter in a low frequency band, a second harmonic interference part of a B-dielectric waveguide filter in a low frequency band and an S-frequency response curve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, in this embodiment, the dielectric waveguide filter 1 is composed of a resonant structure portion and a negative coupling structure portion, wherein fig. 1 and 2 show a partial configuration including two frequency-modulated blind holes and a negative coupling structure, and fig. 3 and 4 show a complete configuration of the dielectric waveguide filter 1 composed of four frequency-modulated blind holes and a negative coupling structure. The dielectric waveguide filter 1 comprises a dielectric body 10, a first frequency modulation blind hole 11 and a second frequency modulation blind hole 12 which are arranged on the dielectric body 10, and a negative coupling structure 2 arranged on the dielectric body 10, wherein the negative coupling structure 2 is positioned between the first frequency modulation blind hole 11 and the second frequency modulation blind hole 12, and a conducting layer 3 is arranged on the surface of the dielectric body 10.
The negative coupling structure 2 comprises a negative coupling blind hole 21, a negative coupling blind groove 22 and a communication hole 23, the axial direction of the negative coupling blind hole 21 is parallel to the axial direction of the first frequency modulation blind hole 11 and the axial direction of the second frequency modulation blind hole 12, the negative coupling blind hole 21, the first frequency modulation blind hole 11 and the second frequency modulation blind hole 12 are arranged on the same side of the medium body 10, the negative coupling blind groove 22 is arranged on the opposite side of the medium body 10, which is opposite to the negative coupling blind hole 21, the communication hole 23 is connected between the negative coupling blind hole 21 and the negative coupling blind groove 22, and the inner wall of the communication hole 23 is provided with an insulating ring zone 4.
The negative coupling structure 2 of the dielectric waveguide filter 1 adopts the design forms of a negative coupling blind hole 21, a negative coupling blind groove 22 and a communication hole 23, and the space of the negative coupling blind hole 21 is communicated with the space of the negative coupling blind groove 22 through the communication hole 23. And, because the surface of the medium body 10 is provided with the conducting layer 3 and the inner wall of the communication hole 23 is provided with the insulating ring zone 4, when a signal passes through the communication hole 23, the electromagnetic field intensity is larger due to space compression, and the insulating ring zone 4 is designed on the inner wall of the communication hole 23 to play a more remarkable coupling effect.
When the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind hole 21, the negative coupling blind groove 22 and the communicating hole 23 can be adjusted before the conductive layer 3 is formed, so that the precision of the negative coupling structure is higher; it is also possible to directly change the size of the shape of the communication hole 23 after the conductive layer 3 is formed to affect the amount of negative coupling, and the manner of adjusting the amount of coupling of the negative coupling structure 2 is more. More importantly, when the overall dimension of the communication hole 23 changes, the shape and dimension of the channel for signal propagation and the insulating ring region 4 change simultaneously, and compared with the filter in the prior art, on the premise of reducing subsequent processing as much as possible, the filter realizes adjustment of coupling quantity in a wider range, thereby improving the anti-interference capability in the second harmonic of a low frequency band, and the performance of the whole filter is better.
The medium body 10 is of a block structure, the first frequency modulation blind hole 11, the second frequency modulation blind hole 12 and the negative coupling blind hole 21 are formed in the upper side face of the medium body 10, and the negative coupling blind groove 22 is formed in the lower side face of the medium body 10. Also, the dielectric body 10 is made of a solid dielectric material, which is a material having a fixed dielectric constant. Specifically, the dielectric body 10 is made of a ceramic material, and the ceramic material is an insulating material with a stable dielectric constant, and can better adapt to the functional requirements of the filter.
In the embodiment, the insulating ring area 4 is arranged on the inner wall of the communication hole 23 and is formed by directly exposing the medium body 10, and the axial dimension of the communication hole 3 is more than or equal to 0.6 mm. Specifically, the negative coupling blind hole 21 and the communication hole 23 are cylindrical holes coaxially arranged, the axial dimension of the communication hole 23 is 0.6mm, the insulating ring region 4 is in the shape of an annular cylinder, and the diameter of the communication hole 23 can be adjusted according to the requirement of coupling amount. The conductive layer 3 is a metal layer fixedly arranged on the surface of the dielectric body 10, and the thickness of the metal layer is any size between 8 μm and 20 μm. Specifically, the metal layer is made of copper or silver, and the thickness of the metal layer is 10 μm. In order to meet different use requirements, in other embodiments, the thickness of the metal layer may also be 8 μm to 10 μm, or any size between 10 μm and 20 μm.
In addition, the axial size of the negative coupling blind hole 21 is larger than the axial sizes of the first frequency modulation blind hole 11 and the second frequency modulation blind hole 21, and the diameter of the negative coupling blind hole 21 is smaller than or equal to the diameters of the first frequency modulation blind hole 11 and the second frequency modulation blind hole 21. The axial dimensions of the first frequency modulation blind hole 11 and the second frequency modulation blind hole 21 determine the resonance frequency characteristic of the dielectric waveguide filter 1, the resonance frequency characteristic is determined by the volume of a resonance structure part in the filter, the larger the volume of the resonance structure part is, the lower the resonance frequency is, and otherwise, the higher the resonance frequency is; the axial dimension of the frequency modulation blind hole is related to the volume of the resonance structure part, so that the axial dimension of the frequency modulation blind hole influences the size of the resonance frequency.
And, the diameter of the communication hole 23 is smaller than that of the negative coupling blind hole 21, and the diameter of the communication hole 23 is smaller than the width of the negative coupling blind groove 22. For the negative coupling structure 2, according to the principle of the control variables: the smaller the axial size of the negative coupling blind hole 21 is, the smaller the coupling amount is, and the larger the diameter thereof is, the smaller the coupling amount is; ② the larger the axial dimension of the communication hole 23 is, the smaller the coupling amount is, and the larger the diameter thereof is, the smaller the coupling amount is; the smaller the depth of the negative coupling blind groove 22 is, the smaller the coupling amount is, and the larger the width is, the smaller the coupling amount is; and fourthly, the larger the area of the insulating ring area 4 is, the smaller the coupling amount is. The smaller the coupling quantity of the negative coupling structure 2 is, the weaker the coupling zero point is, and the farther the coupling zero point is from the passband, the more the performance requirement of the filter is met.
In this embodiment, four frequency modulation blind holes are formed in the dielectric waveguide filter 1, the other two frequency modulation blind holes are respectively a third frequency modulation blind hole 13 and a fourth frequency modulation blind hole 14, the first frequency modulation blind hole 11, the second frequency modulation blind hole 12, the third frequency modulation blind hole 13 and the fourth frequency modulation blind hole 14 are all disposed on the same side of the dielectric body 10, a signal input port 130 is disposed at a position corresponding to the third frequency modulation blind hole 13 on the opposite side of the dielectric body 10, and an input shield ring area 131 located on the periphery of the signal input port 130, correspondingly, a signal output port 140 is disposed at a position corresponding to the third frequency modulation blind hole 13 on the opposite side of the dielectric body 10, and an output shield ring area 141 located on the periphery of the signal output port 140.
The performance parameters of the dielectric waveguide filter 1 were tested as follows:
(1) performance index
Frequency response curve S: the ordinate represents amplitude and the abscissa represents frequency. The meaning is that the filter passes corresponding signals of a certain section of frequency (in a passband) and filters clutter signals of other frequency bands, and the amplitude refers to the filtering strength and weakness amplitude of the filter and has a unit of dB.
The filter with the negative coupling structure is subjected to simulation test by using HFSS simulation software, and a corresponding frequency response curve S is obtained through continuous optimization, as shown in fig. 6.
(2) Specific process of simulation test
The filter containing the negative coupling structure is subjected to simulation test through HFSS simulation software, a simulation S2P curve graph is derived to perform fitting operation of a coupling matrix in CTS software, so that the coupling quantity of each coupling can be obtained, the coupling performance index is finally achieved, and the requirement of users for out-of-passband suppression is met. In the frequency response curve S of the filter in fig. 6, the portion between the coupling zero a and the coupling zero B is in the passband, the portion other than the coupling zero a and the coupling zero B is out of the passband, and the second harmonic interference portion B of the dielectric waveguide filter in the low frequency band has smaller fluctuation than the second harmonic interference portion a of the conventional filter in the low frequency band, and has better interference resistance to the second harmonic in the low frequency band.
The following describes a method for manufacturing a dielectric waveguide filter, including the steps of:
preparing raw materials, and preparing a medium body green blank with a first frequency modulation blind hole 11, a second frequency modulation blind hole 12, a negative coupling blind hole 21, a negative coupling blind groove 22 and a communicating hole 23;
step two, firing the green dielectric body blank to obtain a dielectric body 10;
step three, presetting a protective layer on the surface of the medium body; specifically, the protective layer is ceramic slurry which is sprayed on the inner wall of the communicating hole 23 and can be washed by water.
Fourthly, manufacturing and generating a conductive layer 3 on the surface of the medium body 10 in a spraying, dipping, printing or electroplating mode;
removing the protective layer to obtain an insulating ring area at a corresponding position; or, directly performing the fourth step after the second step, and then forming an insulating ring area by adopting a laser engraving mode;
and step six, adjusting the sizes of the negative coupling structure and the insulating ring area according to the performance required by the dielectric waveguide filter 1.
In embodiment 2 of the dielectric waveguide filter of the present invention, in order to meet different use requirements, the dielectric waveguide filter may also have a six-hole structure, as shown in fig. 7, that is, six frequency modulation blind holes are formed in the dielectric body, the other four frequency modulation blind holes are respectively a third frequency modulation blind hole 13, a fourth frequency modulation blind hole 14, a fifth frequency modulation blind hole 15, and a sixth frequency modulation blind hole 16, and the first frequency modulation blind hole 11, the second frequency modulation blind hole 21, the third frequency modulation blind hole 13, the fourth frequency modulation blind hole 14, the fifth frequency modulation blind hole 15, and the sixth frequency modulation blind hole 16 are all disposed on the same side of the dielectric body 10. In addition, in other embodiments, the material of the dielectric body may be quartz or sapphire, which is also a solid dielectric material with a fixed dielectric constant.
In other embodiments of the dielectric waveguide filter according to the present invention, in order to meet different requirements, the insulating ring region is not limited to be disposed on the inner wall of the through hole, and as shown in fig. 8, the insulating ring region may be disposed on the surface of the dielectric body and around the aperture position of the negative coupling blind hole. Alternatively, as shown in fig. 9, an insulating ring region may be disposed at the surface of the dielectric body and around the notch position of the negative coupling blind slot. Alternatively, as shown in fig. 10, an insulating ring region may be provided at the bottom surface of the negative coupling blind hole and around the aperture position of the communication hole. Still alternatively, as shown in fig. 11, an insulating ring region may be provided at the bottom surface of the negative coupling blind groove and around the aperture position of the communication hole. The insulating ring area is arranged above the dielectric body, and when the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind hole, the negative coupling blind groove and the communicating hole can be adjusted before the conductive layer is formed, so that the precision of the negative coupling structure is higher; and after the conductive layer is formed, the size of the shape of the insulating ring region is changed to influence the negative coupling quantity, the adjustment mode of the coupling quantity of the negative coupling structure is more, the adjustment of the coupling quantity in a wider range is realized, the anti-interference capability in the second harmonic of a low frequency band is improved, and the performance of the whole filter is better.
In other embodiments of the dielectric waveguide filter according to the present invention, in order to meet different requirements, the design form of the negative coupling structure may be adjusted, for example: the axial direction of the negative coupling blind hole is parallel to the axial direction of the first frequency modulation blind hole and the axial direction of the second frequency modulation blind hole, and the negative coupling blind hole, the first frequency modulation blind hole and the second frequency modulation blind hole are arranged on the opposite sides of the medium body, so that a more remarkable coupling effect can be achieved.
The specific embodiments of the method for manufacturing a dielectric waveguide filter according to the present invention are the same as the specific embodiments of the method for manufacturing a dielectric waveguide filter according to the specific embodiments of the dielectric waveguide filter according to the present invention, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A dielectric waveguide filter is characterized by comprising a dielectric body, a first frequency modulation blind hole and a second frequency modulation blind hole which are arranged on the dielectric body, and a negative coupling structure arranged on the dielectric body, wherein the negative coupling structure is positioned between the first frequency modulation blind hole and the second frequency modulation blind hole, and a conductive layer is arranged on the surface of the dielectric body;
the negative coupling structure comprises a negative coupling blind hole, a negative coupling blind groove and a communication hole, the negative coupling blind hole and the negative coupling blind groove are respectively arranged on two opposite side surfaces of the medium body, and the communication hole is connected between the negative coupling blind hole and the negative coupling blind groove; the axial direction of the negative coupling blind hole is parallel to the axial direction of the first frequency modulation blind hole and the axial direction of the second frequency modulation blind hole;
and an insulating ring area is arranged on the inner wall of the communication hole, and the axial size of the communication hole is more than or equal to 0.6 mm.
2. A dielectric waveguide filter according to claim 1 wherein the dielectric body is of a bulk configuration and the negative coupling blind holes are disposed on the same side of the dielectric body as the first and second tuning blind holes.
3. The dielectric waveguide filter of claim 1, wherein the negative coupling blind hole and the communication hole are cylindrical holes coaxially arranged.
4. A dielectric waveguide filter according to claim 1, wherein the dielectric body is made of a solid dielectric material, the solid dielectric material being a material of fixed dielectric constant.
5. A dielectric waveguide filter according to claim 1, wherein the conductive layer is a metal layer fixedly provided on the surface of the dielectric body.
6. A dielectric waveguide filter according to claim 5, wherein the thickness of the metal layer is any dimension between 8 μm and 20 μm.
7. The dielectric waveguide filter of claim 1, wherein the axial dimension of the negative coupling blind hole is greater than the axial dimensions of the first and second tuning blind holes, and the diameter of the negative coupling blind hole is less than or equal to the diameters of the first and second tuning blind holes.
8. The dielectric waveguide filter according to claim 1, wherein the diameter of the communication hole is smaller than the diameter of the negative coupling blind hole, and the diameter of the communication hole is smaller than the width of the negative coupling blind groove.
9. A method for manufacturing a dielectric waveguide filter is characterized by comprising the following steps:
preparing raw materials, and preparing a medium body blank with a first frequency modulation blind hole, a second frequency modulation blind hole, a negative coupling blind groove and a communicating hole;
step two, firing the green dielectric body to obtain a dielectric body;
step three, presetting a protective layer on the surface of the medium body;
fourthly, manufacturing and generating a conducting layer on the surface of the medium body in a spraying, dipping, printing or electroplating mode;
removing the protective layer to obtain an insulating ring area at a corresponding position; or, directly performing the fourth step after the second step, and then forming an insulating ring area by adopting a laser engraving mode; the insulating ring area is arranged on the inner wall of the communicating hole, and the axial size of the communicating hole is more than or equal to 0.6 mm;
and step six, adjusting the sizes of the negative coupling structure and the insulating ring area according to the performance required by the dielectric waveguide filter.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN110265754A (en) * | 2019-07-16 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
| CN210074111U (en) * | 2019-07-12 | 2020-02-14 | 苏州捷频电子科技有限公司 | Negative coupling structure and dielectric filter |
| CN111403872A (en) * | 2019-12-31 | 2020-07-10 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver apparatus including the same |
| CN111540989A (en) * | 2020-02-26 | 2020-08-14 | 江苏灿勤科技股份有限公司 | Filter with negative coupling structure and manufacturing method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0612841B2 (en) * | 1987-08-08 | 1994-02-16 | 沖電気工業株式会社 | Frequency adjustment method for dielectric filter |
| US7545240B2 (en) * | 2005-05-24 | 2009-06-09 | Cts Corporation | Filter with multiple shunt zeros |
| CN111478003A (en) * | 2020-06-03 | 2020-07-31 | 安徽浩源恒方通信技术有限公司 | Capacitance coupling structure of dielectric waveguide filter |
-
2020
- 2020-08-28 CN CN202010892035.6A patent/CN112072240B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN210074111U (en) * | 2019-07-12 | 2020-02-14 | 苏州捷频电子科技有限公司 | Negative coupling structure and dielectric filter |
| CN110265754A (en) * | 2019-07-16 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
| CN111403872A (en) * | 2019-12-31 | 2020-07-10 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver apparatus including the same |
| CN111540989A (en) * | 2020-02-26 | 2020-08-14 | 江苏灿勤科技股份有限公司 | Filter with negative coupling structure and manufacturing method thereof |
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| CN112072240A (en) | 2020-12-11 |
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