CN112234328B - Medium dual-mode filter - Google Patents
Medium dual-mode filter Download PDFInfo
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- CN112234328B CN112234328B CN202011077786.9A CN202011077786A CN112234328B CN 112234328 B CN112234328 B CN 112234328B CN 202011077786 A CN202011077786 A CN 202011077786A CN 112234328 B CN112234328 B CN 112234328B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
- H01P1/2086—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators multimode
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Abstract
The invention provides a dielectric dual-mode filter, which comprises a first metal cavity for inputting radio-frequency signals, a second metal cavity for outputting the radio-frequency signals and a body arranged between the first metal cavity and the second metal cavity, wherein the body comprises one or more dielectric dual-mode resonators, each dielectric dual-mode resonator comprises two resonant cavities, and the two resonant cavities can generate two resonant frequencies. The medium dual-mode filter provided by the invention can reduce the size and weight of the filter, reduce the cost, reduce the insertion loss of the filter, ensure that the out-of-band rejection effect of the filter is good, and greatly meet the requirements of market miniaturization and low loss.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of radio frequency communication, in particular to a medium dual-mode filter.
[ background of the invention ]
A filter is a frequency selective device that is a key component in a communication system and can pass certain desired frequencies of a signal while significantly attenuating other undesired frequencies. With the continuous development of the communication industry, higher requirements are placed on the loss, out-of-band rejection, size, weight and the like of the filter. Smaller size, less loss, better out-of-band rejection characteristics, and lower cost are required. Under the circumstances, the conventional metal filter solution using metal resonators cannot meet the market demand due to the large size and weight.
Accordingly, there is a need to provide an improved filter.
[ summary of the invention ]
The invention mainly aims to provide a dielectric dual-mode filter, which can reduce the volume and the weight of the filter, reduce the insertion loss of the filter and ensure that the out-of-band rejection effect of the filter is good.
In order to achieve the above object, the present invention provides a dielectric dual-mode filter, which includes a first metal cavity for inputting a radio frequency signal, a second metal cavity for outputting a radio frequency signal, and a body installed between the first metal cavity and the second metal cavity, wherein the body includes one or more dielectric dual-mode resonators, and each dielectric dual-mode resonator includes two resonant cavities capable of generating two resonant frequencies.
As a preferable technical scheme, the body includes a plurality of dielectric dual-mode resonators, the plurality of dielectric dual-mode resonators are sequentially arranged along a direction from the first metal cavity to the second metal cavity, and two adjacent dielectric dual-mode resonators are connected together through a connecting member.
As a preferred technical scheme, a first cavity is arranged at one end, close to the body, of the first metal cavity, a first mounting position is arranged at an opening of the first cavity, a second cavity is arranged at one end, close to the body, of the second metal cavity, a second mounting position is arranged at an opening of the second cavity, third cavities are respectively arranged at two ends of the connecting piece, and a third mounting position is arranged at an opening of each third cavity; among the plurality of dielectric dual-mode resonators, one end of the dielectric dual-mode resonator adjacent to the first metal cavity is mounted in the first mounting position, the other end of the dielectric dual-mode resonator is mounted in a third mounting position of an adjacent end of the adjacent connecting piece, one end of the dielectric dual-mode resonator adjacent to the second metal cavity is mounted in the second mounting position, the other end of the dielectric dual-mode resonator is mounted in a third mounting position of an adjacent end of the adjacent connecting piece, and in the rest dielectric dual-mode resonators, two ends of each dielectric dual-mode resonator are respectively mounted in the third mounting positions of the adjacent ends of the adjacent connecting pieces.
As a preferred technical solution, a first coupling structure is arranged at the bottom of the first cavity, and the dielectric dual-mode resonator adjacent to the first metal cavity is coupled with the first metal cavity by energy through the first coupling structure; a second coupling structure is arranged at the bottom of the second cavity, and the dielectric dual-mode resonator adjacent to the second metal cavity is coupled with the second metal cavity through the second coupling structure; and a third coupling structure is arranged between the two third cavities of the connecting piece, and the two adjacent dielectric dual-mode resonators are coupled with energy through the third coupling structure.
As a preferred technical solution, the first coupling structure and the second coupling structure are both a groove.
As a preferred technical solution, the third coupling structure is a through hole, the through hole is respectively communicated with the two third cavities, and the cross section of the through hole is in a shape of a straight line or a cross.
As a preferred technical scheme, at least one end of the dielectric dual-mode resonator is provided with at least one coupling blind slot, and the two resonant cavities are coupled with energy through the coupling blind slot; and a metal layer is arranged on the outer surface of the dielectric dual-mode resonator.
As a preferred technical scheme, two ends of the dielectric dual-mode resonator are respectively provided with a concave position, the bottom of at least one concave position is provided with at least one coupling blind slot, and the two resonant cavities are coupled by energy through the coupling blind slots; and a metal layer is arranged on the outer surface of the dielectric dual-mode resonator.
As a preferred technical scheme, the dielectric dual-mode resonator is cylindrical, four tangent planes are arranged on the outer side surface of the dielectric dual-mode resonator, and the four tangent planes are arranged in pairs in a relative manner.
As a preferred technical solution, the shape of the dielectric dual-mode resonator is a square, a rectangular parallelepiped or a cylinder.
According to the dielectric dual-mode filter provided by the invention, the resonator adopts the dielectric dual-mode resonator capable of generating two resonant frequencies, the size and the weight of the filter can be reduced, the cost is reduced, the insertion loss of the filter can be reduced by utilizing the characteristics of high dielectric constant and high Q value of the medium, the out-of-band rejection effect of the filter is good, and the requirements of market miniaturization and low loss are greatly met.
[ description of the drawings ]
To further disclose the specific technical content of the present disclosure, please refer to the attached drawings, wherein:
fig. 1 is a schematic structural diagram of a dielectric dual-mode filter according to a first embodiment of the present invention;
FIG. 2 is a schematic top view of the dielectric dual-mode filter of FIG. 1;
FIG. 3 is an exploded schematic view of the dielectric dual-mode filter of FIG. 1;
fig. 4 is a schematic structural view of a dielectric dual-mode resonator and a connecting member of the dielectric dual-mode filter shown in fig. 1 mounted together;
fig. 5 is a schematic right-view of a dielectric dual-mode resonator of the dielectric dual-mode filter shown in fig. 1;
fig. 6 is a rear view schematic diagram of a dielectric dual-mode resonator of the dielectric dual-mode filter shown in fig. 1;
fig. 7 is an exploded schematic view of a dielectric dual-mode filter according to a second embodiment of the present invention;
fig. 8 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a third embodiment of the present invention;
fig. 9 is a schematic rear view of the dielectric dual-mode resonator shown in fig. 8;
fig. 10 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a fourth embodiment of the present invention;
fig. 11 is a schematic rear view of the dielectric dual-mode resonator shown in fig. 10;
fig. 12 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a fifth embodiment of the present invention;
figure 13 is a schematic rear view of the dielectric dual-mode resonator of figure 12;
fig. 14 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a sixth embodiment of the present invention;
figure 15 is a schematic rear view of the dielectric dual-mode resonator of figure 14;
fig. 16 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a seventh embodiment of the present invention;
figure 17 is a schematic rear view of the dielectric dual-mode resonator of figure 16;
fig. 18 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to an eighth embodiment of the present invention;
figure 19 is a schematic rear view of the dielectric dual-mode resonator of figure 18;
fig. 20 is a schematic right-view of a dielectric dual-mode resonator of a dielectric dual-mode filter according to a ninth embodiment of the present invention;
fig. 21 is a rear view schematic diagram of the dielectric dual-mode resonator shown in fig. 20.
Description of the symbols:
Dielectric dual-mode resonator 40 coupling blind slot 42
[ detailed description ] embodiments
Referring to fig. 1 to 4, a dielectric dual-mode filter according to a first embodiment of the present invention includes a first metal cavity 10 for inputting a radio frequency signal, a second metal cavity 20 for outputting a radio frequency signal, and a body installed between the first metal cavity 10 and the second metal cavity 20. The body comprises a plurality of dielectric dual-mode resonators 40. The dielectric dual-mode resonator 40 includes two resonant cavities that can generate two resonant frequencies. The resonator of the invention adopts the medium dual-mode resonator 40 which can generate two resonant frequencies, can reduce the volume and the weight of the filter, reduce the cost, and utilize the characteristics of high dielectric constant and high Q value of the medium to reduce the insertion loss of the filter, so that the out-of-band rejection effect of the filter is good, and the requirements of market miniaturization and low loss are greatly met.
The plurality of dielectric dual-mode resonators 40 are sequentially arranged along the direction from the first metal cavity 10 to the second metal cavity 20, and two adjacent dielectric dual-mode resonators 40 are connected together through a connecting piece 60.
The dielectric dual-mode resonator 40 is a ceramic dielectric dual-mode resonator. The outer surface of the dielectric dual-mode resonator 40 is provided with a metal layer, such as a silver layer, a copper layer, or the like. The connector 60 is a metal connector.
Specifically, as shown in fig. 3, a first cavity 12 is disposed at one end of the first metal cavity 10 close to the body, and a first mounting location 122 is disposed at an opening of the first cavity 12. A second cavity (not shown) is arranged at one end of the second metal cavity 20 close to the body, and a second mounting position (not shown) is arranged at the opening of the second cavity. The two ends of the connecting member 60 are respectively provided with a third cavity 62, and the opening of the third cavity 62 is provided with a third mounting position 622. Of the plurality of dielectric dual-mode resonators 40, the dielectric dual-mode resonator 40 adjacent to the first metal cavity 10 has one end mounted in the first mounting location 122 by a fastener such as a screw or the like or by welding, has the other end mounted in the third mounting location 622 of the adjacent end of the adjacent connecting member 60 by a fastener such as a screw or the like or by welding, the dielectric dual-mode resonator 40 adjacent to the second metal cavity 20 has one end mounted in the second mounting location by a fastener such as a screw or the like or by welding, has the other end mounted in the third mounting location 622 of the adjacent end of the adjacent connecting member 60 by a fastener such as a screw or the like or by welding, and in the remaining dielectric dual-mode resonators 40, both ends of each dielectric dual-mode resonator 40 are mounted in the third mounting locations 622 of the adjacent ends of the adjacent connecting members 60 by a fastener such as a screw or the like or by welding, respectively, the installation is convenient, and the manufacture is easy.
The bottom of the first cavity 12 is provided with a first coupling structure 124, and the dielectric dual-mode resonator 40 adjacent to the first metal cavity 10 is coupled with the first metal cavity 10 through the first coupling structure 124. The bottom of the second cavity is provided with a second coupling structure (not shown in the figure), and the dielectric dual-mode resonator 40 adjacent to the second metal cavity 20 is coupled with the second metal cavity 20 through the second coupling structure. A third coupling structure 64 is arranged between the two third cavities 62 of the connecting element 60, and energy is coupled between two adjacent dielectric dual-mode resonators 40 through the third coupling structure 64.
Preferably, the first coupling structure 124 and the second coupling structure are both a groove.
Preferably, the third coupling structure 64 is a through hole, and the through holes are respectively communicated with the two third cavities 62. The cross section of the through hole is in a straight line shape or a cross shape.
In this embodiment, the number of the dielectric dual-mode resonators 40 is four, and the number of the connecting members 60 is three. The four dielectric dual-mode resonators 40 are identical in size and shape. It is understood that in other embodiments, the four dielectric dual-mode resonators 40 may not be identical in size or shape. The size and shape of the connecting member 60 adjacent to the first metal chamber 10 in this embodiment are different from those of the other two connecting members 60. It is understood that the size and shape of the three connectors 60 may be the same in other embodiments. The size and shape of the dielectric dual-mode resonator 40 and the size and shape of the connecting member 60 can be set according to actual situations.
In this embodiment, the cross-sectional shape of the through-hole of the connecting member 60 adjacent to the first metal chamber 10 is cross-shaped, the cross-sectional shape of the through-hole of the connecting member 60 adjacent to the second metal chamber 20 is cross-shaped, and the cross-sectional shape of the through-hole of the connecting member 60 in the middle is in-line shape. It will be appreciated that in other embodiments, the cross-sectional shapes of the through-holes of the three connectors 60 may be the same, such as a straight line or a cross. Alternatively, for example, the cross-sectional shape of the through-hole of the connector 60 adjacent to the first metal chamber 10 and the cross-sectional shape of the through-hole of the connector 60 adjacent to the second metal chamber 20 are both in a straight shape, and the cross-sectional shape of the through-hole of the connector 60 in the middle is in a cross shape. The specific cross-sectional shape of the through-hole of the connecting member 60 can be set according to the actual situation.
Referring to fig. 5 and 6, a coupling blind slot 42 is provided at one end of the dielectric dual-mode resonator 40, and the coupling blind slot 42 is preferably provided at one end of the dielectric dual-mode resonator 40 far from the first metal cavity 10. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the coupling blind slot 42.
In this embodiment, the coupling blind slot 42 is located at the middle of the end of the dielectric dual-mode resonator 40 far from the first metal cavity 10. The cross-sectional shape of the coupling blind groove 42 is a rounded rectangle. It is understood that the cross-sectional shape of the coupling blind groove 42 may also be, for example, an ellipse, a cross, a circle, a square, a polygon, etc., which can be set according to practical situations.
In this embodiment, the dielectric dual-mode resonator 40 is cylindrical and is convenient to manufacture, four cut surfaces 44 (see fig. 5) are arranged on the outer side surface of the dielectric dual-mode resonator 40, and the four cut surfaces 44 are arranged in pairs in an opposite manner. It is understood that the shape of the dielectric dual-mode resonator 40 may also be, for example, a square shape, a rectangular parallelepiped shape, a cylindrical shape, or the like.
Referring to fig. 7, a dielectric dual-mode filter according to a second embodiment of the present invention is different from the first embodiment in that a body includes a dielectric dual-mode resonator 40. One end of the dielectric dual-mode resonator 40 is mounted in the first mounting location 122 of the first metal cavity 10 and the other end is mounted in the second mounting location of the second metal cavity 20.
The first metal cavity 10 and the dielectric dual-mode resonator 40 are coupled in energy through the first coupling structure 124, and the second metal cavity 20 and the dielectric dual-mode resonator 40 are coupled in energy through the second coupling structure.
Referring to fig. 8 and fig. 9, a dielectric dual-mode filter according to a third embodiment of the present invention is different from the first embodiment in that two coupling blind slots 42 are disposed at one end of the dielectric dual-mode resonator 40 away from the first metal cavity 10, and the two coupling blind slots 42 are respectively disposed at two sides of one end of the dielectric dual-mode resonator 40 away from the first metal cavity 10. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the two coupling blind slots 42.
Referring to fig. 10 and fig. 11, a dielectric dual-mode filter according to a fourth embodiment of the present invention is different from the first embodiment in that a coupling blind slot 42 is respectively disposed at the middle positions of two ends of a dielectric dual-mode resonator 40. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the two coupling blind slots 42.
Referring to fig. 12 and fig. 13, a dielectric dual-mode filter according to a fifth embodiment of the present invention is different from the first embodiment in that two ends of a dielectric dual-mode resonator 40 are respectively provided with two coupling blind slots 42, and each two coupling blind slots 42 are respectively located at two sides of a corresponding end of the dielectric dual-mode resonator 40. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the four coupling blind slots 42.
Referring to fig. 14 and fig. 15, a dielectric dual-mode filter according to a sixth embodiment of the present invention is different from the first embodiment in that two ends of a dielectric dual-mode resonator 40 are respectively provided with a concave portion 46, and the cross-sectional shape of the concave portion 46 is preferably the same as the cross-sectional shape of the dielectric dual-mode resonator 40. A coupling blind groove 42 is formed at the middle position of the bottom of one of the recesses 46. Preferably, the coupling blind slot 42 is provided at a middle position of the bottom of the recess 46 away from the first metal chamber 10. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the coupling blind slot 42.
Referring to fig. 16 and fig. 17, a dielectric dual-mode filter according to a seventh embodiment of the present invention is different from the sixth embodiment in that two coupling blind slots 42 are respectively disposed on two sides of the bottom of a concave portion 46 of a dielectric dual-mode resonator 40 away from a first metal cavity 10. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the two coupling blind slots 42.
Referring to fig. 18 and fig. 19, an eighth embodiment of the dielectric dual-mode filter according to the present invention is different from the sixth embodiment in that a coupling blind slot 42 is respectively disposed at the bottom of the concave portions 46 at two ends of the dielectric dual-mode resonator 40. Each coupling blind slot 42 is located at an intermediate position at the bottom of the corresponding recess 46. The two resonant cavities of the dielectric dual-mode resonator 40 are coupled with energy through the two coupling blind slots 42.
Referring to fig. 20 and fig. 21, a ninth embodiment of the dielectric dual-mode filter according to the present invention is different from the sixth embodiment in that two coupling blind slots 42 are respectively disposed on two sides of the bottom of each concave portion 46 of the dielectric dual-mode resonator 40. The two resonant cavities of the dielectric dual-mode resonator are coupled with energy through the four coupling blind slots 42.
In other embodiments, three, four, or more than four coupling blind slots 42 are provided at one end of the dual-mode dielectric resonator 40, or three, four, or more than four coupling blind slots 42 are provided at two ends of the dual-mode dielectric resonator 40, or three, four, or more than four coupling blind slots 42 are provided at the bottom of the recessed position 46 at one end of the dual-mode dielectric resonator 40, or three, four, or more than four coupling blind slots 42 are provided at the bottom of the recessed position 46 at two ends of the dual-mode dielectric resonator 40, and the number and the positions of the coupling blind slots 42 may be set according to actual conditions.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A dielectric dual-mode filter comprises a first metal cavity used for inputting radio frequency signals and a second metal cavity used for outputting the radio frequency signals, and is characterized by further comprising a body arranged between the first metal cavity and the second metal cavity, wherein the body comprises a plurality of dielectric dual-mode resonators which are sequentially arranged along the direction from the first metal cavity to the second metal cavity, each dielectric dual-mode resonator comprises two resonant cavities, and the two resonant cavities can generate two resonant frequencies; at least two coupling blind slots are arranged at one end of the dielectric dual-mode resonator, which is far away from the first metal cavity, and the two resonant cavities are coupled with energy through the coupling blind slots; and a metal layer is arranged on the outer surface of the dielectric dual-mode resonator.
2. The dielectric dual-mode filter according to claim 1, wherein two adjacent dielectric dual-mode resonators are connected together by a connecting member.
3. The dielectric dual-mode filter of claim 2, wherein a first cavity is disposed at one end of the first metal cavity close to the body, a first mounting position is disposed at an opening of the first cavity, a second cavity is disposed at one end of the second metal cavity close to the body, a second mounting position is disposed at an opening of the second cavity, third cavities are disposed at two ends of the connecting member, and a third mounting position is disposed at an opening of the third cavity; among the plurality of dielectric dual-mode resonators, one end of the dielectric dual-mode resonator adjacent to the first metal cavity is mounted in the first mounting position, the other end of the dielectric dual-mode resonator is mounted in a third mounting position of an adjacent end of the adjacent connecting piece, one end of the dielectric dual-mode resonator adjacent to the second metal cavity is mounted in the second mounting position, the other end of the dielectric dual-mode resonator is mounted in a third mounting position of an adjacent end of the adjacent connecting piece, and in the rest dielectric dual-mode resonators, two ends of each dielectric dual-mode resonator are respectively mounted in the third mounting positions of the adjacent ends of the adjacent connecting pieces.
4. The dielectric dual-mode filter of claim 3, wherein a first coupling structure is disposed at a bottom of the first cavity, and the dielectric dual-mode resonator adjacent to the first metal cavity is coupled with the first metal cavity by energy through the first coupling structure; a second coupling structure is arranged at the bottom of the second cavity, and the dielectric dual-mode resonator adjacent to the second metal cavity is coupled with the second metal cavity through the second coupling structure; and a third coupling structure is arranged between the two third cavities of the connecting piece, and the two adjacent dielectric dual-mode resonators are coupled with energy through the third coupling structure.
5. A dielectric dual-mode filter according to claim 4, characterized in that the first coupling structure and the second coupling structure are both a recess.
6. The dielectric dual-mode filter of claim 4, wherein the third coupling structure is a through hole, the through hole is respectively communicated with the two third cavities, and the cross section of the through hole is in a straight shape or a cross shape.
7. The dielectric dual-mode filter according to claim 3, wherein, of the plurality of dielectric dual-mode resonators, the dielectric dual-mode resonator adjacent to the first metal cavity has one end mounted in the first mounting position by a screw, and has the other end mounted in a third mounting position of the adjacent end of the adjacent connecting member by a screw, and the dielectric dual-mode resonator adjacent to the second metal cavity has one end mounted in the second mounting position by a screw, and has the other end mounted in a third mounting position of the adjacent end of the adjacent connecting member by a screw, and in the remaining dielectric dual-mode resonators, both ends of each dielectric dual-mode resonator are respectively mounted in the third mounting position of the adjacent end of the adjacent connecting member by a screw.
8. The dielectric dual-mode filter according to claim 1, wherein two ends of the dielectric dual-mode resonator along a direction from the first metal cavity to the second metal cavity are respectively provided with a concave position, the bottom of at least one concave position is provided with the at least two coupling blind slots, and the two resonant cavities are coupled with energy through the coupling blind slots; and a metal layer is arranged on the outer surface of the dielectric dual-mode resonator.
9. The dielectric dual-mode filter according to claim 1, wherein the dielectric dual-mode resonator has a cylindrical shape, four cut surfaces are provided on an outer side surface of the dielectric dual-mode resonator, and the four cut surfaces are arranged opposite to each other in pairs.
10. The dielectric dual-mode filter according to claim 1, wherein the dielectric dual-mode resonator has a square, rectangular or cylindrical shape.
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| CN202011077786.9A CN112234328B (en) | 2020-10-10 | 2020-10-10 | Medium dual-mode filter |
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| CN112234328B true CN112234328B (en) | 2022-02-01 |
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| CN112928411B (en) * | 2021-01-27 | 2022-05-24 | 武汉凡谷电子技术股份有限公司 | Dual-mode dielectric filter and zero adjusting method thereof |
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| JPS6165501A (en) * | 1984-09-06 | 1986-04-04 | Nec Corp | Band pass filter |
| EP0615302A1 (en) * | 1993-03-12 | 1994-09-14 | Matra Marconi Space Uk Limited | Dielectric resonator filter |
| CN110808441A (en) * | 2019-11-26 | 2020-02-18 | 深圳市国人射频通信有限公司 | Dual-mode filter |
| CN111384555A (en) * | 2018-12-31 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter, communication equipment, method for preparing dielectric block and dielectric filter |
| CN111403876A (en) * | 2020-04-27 | 2020-07-10 | 江苏贝孚德通讯科技股份有限公司 | Small-sized mixed mode filter with two resonant cavities |
| CN111740194A (en) * | 2020-07-30 | 2020-10-02 | 江苏贝孚德通讯科技股份有限公司 | Small-sized medium double-mode filter without outer shell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3015783B1 (en) * | 2013-12-20 | 2016-01-15 | Thales Sa | HYPERFREQUENCY FILTER BAND TUNABLE BY RELATIVE ROTATION OF AN INSERT SECTION AND A DIELECTRIC ELEMENT |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6165501A (en) * | 1984-09-06 | 1986-04-04 | Nec Corp | Band pass filter |
| EP0615302A1 (en) * | 1993-03-12 | 1994-09-14 | Matra Marconi Space Uk Limited | Dielectric resonator filter |
| CN111384555A (en) * | 2018-12-31 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter, communication equipment, method for preparing dielectric block and dielectric filter |
| CN110808441A (en) * | 2019-11-26 | 2020-02-18 | 深圳市国人射频通信有限公司 | Dual-mode filter |
| CN111403876A (en) * | 2020-04-27 | 2020-07-10 | 江苏贝孚德通讯科技股份有限公司 | Small-sized mixed mode filter with two resonant cavities |
| CN111740194A (en) * | 2020-07-30 | 2020-10-02 | 江苏贝孚德通讯科技股份有限公司 | Small-sized medium double-mode filter without outer shell |
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