CN112072239A - Dielectric filter and manufacturing method thereof - Google Patents
Dielectric filter and manufacturing method thereof Download PDFInfo
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- CN112072239A CN112072239A CN202010892034.1A CN202010892034A CN112072239A CN 112072239 A CN112072239 A CN 112072239A CN 202010892034 A CN202010892034 A CN 202010892034A CN 112072239 A CN112072239 A CN 112072239A
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- negative coupling
- hole
- blind
- frequency modulation
- blind hole
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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 filter and a manufacturing method thereof, and relates to the field of filters. The dielectric 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 groove and a negative coupling through hole, the negative coupling blind groove, the first frequency modulation blind hole and the second frequency modulation blind hole are arranged on the same side of the medium body, and the negative coupling blind groove is communicated with the first frequency modulation blind hole or the second frequency modulation blind hole; the negative coupling through hole penetrates through the bottom of the negative coupling blind groove, extends to the back side of the medium body, back to the negative coupling blind groove, and is provided with an insulating ring area. The suppression requirement of far-end high frequency is met, the adjustment mode of the coupling quantity of the negative coupling structure is more, 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 filter and a manufacturing method thereof.
Background
With the development of mobile communication technology, update iterations of a base station apparatus occur rapidly. The filter in the base station device is an element for selecting a radio wave of a specific frequency and suppressing a radio wave of another frequency.
The dielectric filter is one of common filters, and a deep blind hole is usually designed in the dielectric filter to be used as a negative coupling structure to realize capacitive coupling, but the negative coupling structure in the form is single in structure due to the large depth of the blind hole, so that later debugging is not facilitated. Subsequently, chinese utility model patent with publication number CN210468049U and publication date 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 amount of the negative coupling structure can be adjusted only by the shape and size of the second blind hole and the open slot, the adjustment mode of the coupling amount of the negative coupling structure is limited, the requirement of far-end high-frequency suppression cannot be met, the filter is easily affected by interference in the second harmonic of a low frequency band, 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 filter that solves the problems that the adjustment method of the coupling amount of the negative coupling structure is limited, the requirement for far-end high-frequency suppression cannot be satisfied, 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 filter.
The technical scheme of the dielectric filter is as follows:
the dielectric 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 groove and a negative coupling through hole, the negative coupling blind groove, the first frequency modulation blind hole and the second frequency modulation blind hole are arranged on the same side of the medium body, and the negative coupling blind groove is communicated with the first frequency modulation blind hole or the second frequency modulation blind hole; the negative coupling through hole penetrates through the bottom of the negative coupling blind groove, extends to the back side of the medium body, back to the negative coupling blind groove, and an insulating ring area is further arranged at the hole opening position of the negative coupling through hole.
Further, the insulating ring region is arranged on the groove bottom of the negative coupling blind groove and surrounds the negative coupling through hole, or the insulating ring region is arranged on the lower side surface of the medium body and surrounds the negative coupling through hole.
Furthermore, the insulating ring area is in a ring shape, the negative coupling through hole is in a cylindrical shape, and the insulating ring area and the negative coupling through hole are concentrically arranged.
Furthermore, the negative coupling blind slot is a long slot, and the length direction of the negative coupling blind slot extends between the first frequency modulation blind hole and the second frequency modulation blind hole.
Furthermore, the negative coupling blind groove is communicated with the first frequency modulation blind hole, and the other end of the negative coupling blind groove is arranged separately from the second frequency modulation blind hole.
Further, the diameter of the negative coupling through hole is smaller than or equal to the width of the negative coupling blind slot.
Furthermore, the width of the negative coupling blind slot is smaller than or equal to the diameter of the first frequency modulation blind hole, and the diameter of the second frequency modulation blind hole is equal to the diameter of the first frequency modulation blind hole.
Furthermore, the depth of the negative coupling blind groove is any multiple between 0.2 and 0.8 times of the depth of the first frequency modulation blind hole.
Has the advantages that: the negative coupling structure of the dielectric filter adopts the structural form of the negative coupling blind groove and the negative coupling through hole, the conductive layer is arranged on the surface of the dielectric body, the insulating ring area is arranged at the orifice position of the negative coupling through hole, the insulating ring area can play a more remarkable coupling effect, and the requirement of inhibiting the far-end high frequency is met. When the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind groove and the negative coupling through hole can be adjusted before the conductive layer is formed, so that the precision of the negative coupling structure is higher; the negative coupling quantity can be influenced by adjusting the shape and size of the insulating ring area at the orifice position of the negative coupling through hole after the conductive layer 3 is formed, more adjustment modes are provided for the coupling quantity of the negative coupling structure, the coupling quantity can be adjusted in a wider range, the anti-interference capability in the second harmonic of a low frequency band is improved, and the performance of the whole filter is better.
The technical scheme of the manufacturing method of the dielectric filter is as follows:
the manufacturing method of the dielectric filter comprises the following steps:
preparing raw materials, and preparing a dielectric body green blank with a first frequency modulation blind hole, a second frequency modulation blind hole, a negative coupling blind groove and a negative coupling through 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 filter adopts the structural form of the negative coupling blind groove and the negative coupling through hole, the conductive layer is arranged on the surface of the dielectric body, the insulating ring area is arranged at the orifice position of the negative coupling through hole, the insulating ring area can play a more remarkable coupling effect, and the requirement of inhibiting the far-end high frequency is met. When the coupling amount is adjusted, the shapes and the sizes of the negative coupling blind groove and the negative coupling through hole can be adjusted before the conductive layer is formed, so that the precision of the negative coupling structure is higher; the negative coupling quantity can be influenced by adjusting the shape and size of the insulating ring area at the orifice position of the negative coupling through hole after the conductive layer 3 is formed, more adjustment modes are provided for the coupling quantity of the negative coupling structure, the coupling quantity can be adjusted in a wider range, the anti-interference capability in the second harmonic of a low frequency band is improved, and the performance of the whole filter is better.
Drawings
Fig. 1 is a partial perspective view of a dielectric filter according to an embodiment 1 of the dielectric filter of the present invention;
fig. 2 is a vertical schematic view of a dielectric filter in embodiment 1 of the dielectric filter of the present invention;
fig. 3 is an overall perspective view of a dielectric filter in embodiment 1 of the dielectric filter of the present invention;
fig. 4 is a frequency response diagram obtained by a simulation test of the dielectric filter in embodiment 1 of the dielectric filter of the present invention;
FIG. 5 is a test chart of far-end high-frequency rejection of a conventional filter;
fig. 6 is a test chart of the far-end high-frequency suppression of the dielectric filter in embodiment 1 of the dielectric filter of the present invention.
In the figure: the filter comprises a medium body 1, a first frequency modulation blind hole 11, a second frequency modulation blind hole 12, a negative coupling structure 2, a negative coupling blind groove 21, a negative coupling through hole 22, an insulating ring area 23, a conductive layer 3, a third frequency modulation blind hole 13, a fourth frequency modulation blind hole 14, a fifth frequency modulation blind hole 15, a sixth frequency modulation blind hole 16, a second harmonic interference part of an A-medium 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.
The negative coupling structure 2 comprises a negative coupling blind groove 21 and a negative coupling through hole 22, the negative coupling blind groove 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 1, and the negative coupling blind groove 21 is communicated with the first frequency modulation blind hole 11 or the second frequency modulation blind hole 12; the negative coupling through hole 22 penetrates through the bottom of the negative coupling blind groove 21, the negative coupling through hole 22 extends to the opposite side of the medium body 1 back to the negative coupling blind groove 21, and an insulating ring area is further arranged at the orifice position of the negative coupling through hole 22.
The negative coupling structure of the dielectric filter adopts the structural form of the negative coupling blind slot 21 and the negative coupling through hole 22, the conducting layer 3 is arranged on the surface of the dielectric body 1, and the insulating ring area is arranged at the orifice position of the negative coupling through hole 22, so that the insulating ring area can play a more remarkable coupling effect, and the requirement of inhibiting the far-end high frequency is met. When the coupling amount is adjusted, the shape and the size of the negative coupling blind groove 21 and the negative coupling through hole 22 can be adjusted before the conductive layer 3 is formed, so that the precision of the negative coupling structure is higher; after the conducting layer 3 is formed, the shape and the size of the insulating ring area at the orifice position of the negative coupling through hole 22 are adjusted to influence the negative coupling quantity, the adjustment mode of the coupling quantity of the negative coupling structure 2 is more, the adjustment of the coupling quantity in a wider range is realized, the anti-interference capacity in the second harmonic of a low frequency band is further improved, and the performance of the whole filter is better.
The medium body 1 is of a block structure, the first frequency modulation blind hole 11, the second frequency modulation blind hole 12 and the negative coupling blind groove 21 are arranged on the upper side face of the medium body 1, and the negative coupling through hole 22 extends to the lower side face of the medium body. And, the dielectric body 1 is made of solid insulating material, specifically, the dielectric body 1 is made of ceramic material, and the ceramic material is insulating material with stable dielectric constant, which can better adapt to the functional requirements of the filter. In this embodiment, the insulating ring area is disposed on the lower side surface of the dielectric body 1 and surrounds the negative coupling through hole 22, specifically, the insulating ring area is the insulating ring area 23, the negative coupling through hole 22 is a cylindrical hole, the insulating ring area 23 is a circular ring, the insulating ring area 23 and the negative coupling through hole 22 are concentrically arranged, the processing operation is convenient, and the transmission zero point generated by the negative coupling structure 2 is more stable.
Further, the negative coupling blind slot 21 is a long slot, and the length direction of the negative coupling blind slot 21 extends between the first frequency modulation blind hole 11 and the second frequency modulation blind hole 12. The negative coupling blind groove 21 is communicated with the first frequency modulation blind hole 11, and the other end of the negative coupling blind groove 21 is arranged in a separated mode with the second frequency modulation blind hole 12. The negative coupling blind groove 21 is communicated with the first frequency modulation blind hole 11, and the negative coupling blind groove 21 is separated from the second frequency modulation blind hole 12, so that the negative coupling structure 2 achieves a better coupling effect.
Moreover, the diameter of the negative coupling through hole 22 is smaller than or equal to the width of the negative coupling blind groove 21, the width of the negative coupling blind groove 21 is smaller than or equal to the diameter of the first frequency modulation blind hole 11, and the diameter of the second frequency modulation blind hole 12 is equal to the diameter of the first frequency modulation blind hole 11. The depth of the negative coupling blind groove 21 is any multiple between 0.2 and 0.8 times of the depth of the first frequency modulation blind hole 11. In the present embodiment, the depth of the negative coupling blind slot 21 is 0.6 times the depth of the first frequency modulation blind hole 11, and the width of the negative coupling blind slot 21 is greater than or equal to the diameter of the negative coupling through hole 22. In order to meet different use requirements, in other embodiments, the depth of the negative coupling blind groove can be 0.2 to 0.6 times the depth of the first frequency modulation blind hole, or any multiple between 0.6 and 0.8 times.
In this embodiment, six frequency modulation blind holes are formed in the dielectric filter, 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 12, 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 arranged on the same side of the dielectric body 1.
It should be noted that the axial dimensions of the first frequency modulation blind hole 11 and the second frequency modulation blind hole 12 determine the resonant frequency characteristic of the dielectric filter, the resonant frequency characteristic is determined by the volume of the resonant structure part in the filter, the larger the volume of the resonant structure part is, the lower the resonant frequency is, and conversely, the higher the resonant 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.
For the negative coupling structure 2, according to the principle of the control variables: the smaller the depth of the negative coupling blind groove 21 is, the smaller the coupling amount is, and the larger the width is, the smaller the coupling amount is; the larger the axial size of the negative coupling through hole 22 is, the smaller the coupling amount is, and the larger the diameter thereof is, the smaller the coupling amount is; and thirdly, the larger the area of the insulating ring region 23 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.
The performance parameters of the dielectric filter 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. 4.
(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. 4, 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 a of the dielectric 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.
For the suppression effect of the far-end high frequency, as shown in fig. 5, the harmonic in the far-end high frequency region of the existing filter is 5.5GHz to 6.0 GHz; as shown in fig. 6, in the far-end high-frequency region of the dielectric filter of the present invention, the harmonic is above 6.0GHz, which can better satisfy the requirement of suppressing the far-end high frequency.
The following explains a method for manufacturing a dielectric filter, including the steps of:
preparing raw materials, and preparing a dielectric body blank with a first frequency modulation blind hole 11, a second frequency modulation blind hole 12, a negative coupling blind groove 21 and a negative coupling through hole 22;
step two, firing the green dielectric body blank to obtain a dielectric body 1;
step three, presetting a protective layer at the orifice position of the negative coupling through hole 22; specifically, the protective layer is water-washable ceramic slurry sprayed at the orifice position of the negative coupling through hole 22;
fourthly, manufacturing and generating a conductive layer 3 on the surface of the medium body 1 in a spraying, dipping, printing or electroplating mode;
removing the protective layer to obtain an insulating ring area at the orifice position of the negative coupling through hole 22; 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 filter.
In other embodiments of the dielectric filter of the present invention, in order to meet different usage requirements, the insulating ring region is disposed on the bottom of the negative coupling blind slot and surrounds the negative coupling through hole, the shape of the negative coupling through hole is not limited to the cylindrical hole in embodiment 1, but may also be a square column hole, an elliptical column hole, a polygonal column hole, or a stepped prism hole, and the like, and in addition, the insulating ring region may also be a square ring shape, an elliptical ring shape, a polygonal ring shape, or an irregular closed ring shape, and the like.
The specific embodiments of the method for manufacturing a dielectric filter according to the present invention are the same as the specific embodiments of the method for manufacturing a dielectric filter according to the specific embodiments of the dielectric 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 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 groove and a negative coupling through hole, the negative coupling blind groove, the first frequency modulation blind hole and the second frequency modulation blind hole are arranged on the same side of the medium body, and the negative coupling blind groove is communicated with the first frequency modulation blind hole or the second frequency modulation blind hole; the negative coupling through hole penetrates through the bottom of the negative coupling blind groove, extends to the back side of the medium body, back to the negative coupling blind groove, and an insulating ring area is further arranged at the hole opening position of the negative coupling through hole.
2. The dielectric filter of claim 1, wherein the insulating ring region is disposed on a bottom surface of the negative coupling blind slot and surrounds the negative coupling through hole, or the insulating ring region is disposed on a lower side surface of the dielectric body and surrounds the negative coupling through hole.
3. The dielectric filter of claim 1, wherein the insulating ring region is annular in shape and the negative coupling via is cylindrical in shape, the insulating ring region being concentrically disposed with the negative coupling via.
4. The dielectric filter of claim 1, wherein the negative coupling blind slot is an elongated slot, the length direction of the negative coupling blind slot extending between the first and second tuning blind holes.
5. The dielectric filter of claim 4, wherein the negative coupling blind slot is in communication with the first tuning blind hole, and the other end of the negative coupling blind slot is spaced apart from the second tuning blind hole.
6. The dielectric filter of claim 1, wherein the diameter of the negative coupling via is equal to or less than the width of the negative coupling blind slot.
7. The dielectric filter of claim 1, wherein the width of the negative coupling blind slot is less than or equal to the diameter of the first tuning blind hole, and the diameter of the second tuning blind hole is equal to the diameter of the first tuning blind hole.
8. The dielectric filter of claim 1, wherein the depth of the negative coupling blind slot is any multiple between 0.2 and 0.8 times the depth of the first tuning blind hole.
9. A method for manufacturing a dielectric filter is characterized by comprising the following steps:
preparing raw materials, and preparing a dielectric body green blank with a first frequency modulation blind hole, a second frequency modulation blind hole, a negative coupling blind groove and a negative coupling through 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010892034.1A CN112072239A (en) | 2020-08-28 | 2020-08-28 | Dielectric filter and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010892034.1A CN112072239A (en) | 2020-08-28 | 2020-08-28 | Dielectric filter and manufacturing method thereof |
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| CN112072239A true CN112072239A (en) | 2020-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615124A (en) * | 2020-12-28 | 2021-04-06 | 京信射频技术(广州)有限公司 | Dielectric waveguide filter and method for processing dielectric ceramic silver layer thereof |
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| 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 |
| CN110534851A (en) * | 2019-09-28 | 2019-12-03 | 江西一创新材料有限公司 | A kind of dielectric filter coupled structure for realizing symmetrical transmission zero point |
| 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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2020
- 2020-08-28 CN CN202010892034.1A patent/CN112072239A/en active Pending
Patent Citations (4)
| 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 |
| CN110534851A (en) * | 2019-09-28 | 2019-12-03 | 江西一创新材料有限公司 | A kind of dielectric filter coupled structure for realizing symmetrical transmission zero point |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615124A (en) * | 2020-12-28 | 2021-04-06 | 京信射频技术(广州)有限公司 | Dielectric waveguide filter and method for processing dielectric ceramic silver layer thereof |
| CN112615124B (en) * | 2020-12-28 | 2023-06-20 | 京信射频技术(广州)有限公司 | Method for processing dielectric ceramic silver layer |
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Application publication date: 20201211 |