CN111384483A - Dielectric filter applied to 5G communication system, manufacturing method thereof and communication equipment - Google Patents
Dielectric filter applied to 5G communication system, manufacturing method thereof and communication equipment Download PDFInfo
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- CN111384483A CN111384483A CN201910208717.8A CN201910208717A CN111384483A CN 111384483 A CN111384483 A CN 111384483A CN 201910208717 A CN201910208717 A CN 201910208717A CN 111384483 A CN111384483 A CN 111384483A
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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
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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Abstract
The application discloses a dielectric filter applied to a 5G communication system, a manufacturing method thereof and communication equipment, wherein the dielectric filter comprises: a circuit board including a core body and metal foils provided on two main surfaces of the core body opposite to each other, wherein the circuit board is processed into a predetermined filter shape; and the electromagnetic shielding layer is arranged on the side surface of the plate core body exposed by the metal foils on two sides. This application can improve production efficiency, need not the mould, shortens production cycle, and reduce cost improves the machining precision.
Description
Technical Field
The application relates to the technical field of communication equipment, in particular to a dielectric filter applied to a 5G communication system, a manufacturing method thereof and communication equipment.
Background
With the rapid advance of communication technology, especially in the coming 5G communication era, more rigorous technical requirements are put on system architecture, and while high-efficiency and high-capacity communication is realized, system modules are required to be highly integrated, miniaturized, light-weighted and low-cost. For example, when the 5G Massive MIMO technology further expands the system channel from the current 8 or 16 channels to 32, 64, or even 128 channels, the overall architecture size of the system cannot be too large, and even a certain degree of miniaturization needs to be realized. The microwave filter is used as a core component of a system, and performance parameters, size and cost of the microwave filter have great influence on the performance, architecture size and cost of the system.
The inventor of the present application finds, in long-term research and development work, that the existing dielectric filter is integrally formed, the machining precision is low, and the size of the dielectric filter is deviated, so that the stop band rejection capability of the dielectric filter is poor.
Disclosure of Invention
In order to solve the above problems of the dielectric filter in the prior art, the present application provides a dielectric filter applied to a 5G communication system, a manufacturing method thereof, and a communication device.
In order to solve the above problem, an embodiment of the present application provides a dielectric filter applied to a 5G communication system, including: a circuit board including a core body and metal foils provided on two main surfaces of the core body opposite to each other, wherein the circuit board is processed into a predetermined filter shape; and the electromagnetic shielding layer is arranged on the side surface of the plate core body exposed by the metal foils on two sides.
In order to solve the above technical problem, the present invention further provides a communication device applied to a 5G communication system, which includes an antenna and the above dielectric filter, where the antenna is coupled to the dielectric filter.
In order to solve the above technical problem, the present invention further provides a method for manufacturing a dielectric filter, including:
providing a circuit board, wherein the circuit board comprises a board core body and metal foils arranged on two main surfaces of the board core body, wherein the two main surfaces are opposite to each other;
machining the circuit board into a preset filter shape in a machining mode;
forming an electromagnetic shielding layer on a side surface of the core body exposed by the metal foils on both sides.
Compared with the prior art, the dielectric filter comprises a circuit board and an electromagnetic shielding layer, wherein the circuit board comprises a board core body and metal foils arranged on two main surfaces of the board core body, which are opposite to each other, the electromagnetic shielding layer is arranged on the side surface of the board core body exposed by the metal foils on two sides, and the circuit board is processed into a preset filter shape; the circuit board is processed into the dielectric filter by batch production, so that the processing precision is improved, the size deviation of the dielectric filter is avoided, and the stop band inhibition capability of the dielectric filter can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a dielectric filter according to a first embodiment of the present application;
fig. 2 is a schematic structural view of a dielectric filter according to a second embodiment of the present application;
fig. 3 is a schematic structural view of a dielectric filter according to a third embodiment of the present application;
fig. 4 is a schematic structural view of a dielectric filter according to a fourth embodiment of the present application;
fig. 5 is a schematic structural view of a dielectric filter according to a fifth embodiment of the present application;
fig. 6 is a schematic view of the structure of another dielectric filter of fig. 5;
fig. 7 is a schematic structural view of a dielectric filter according to a sixth embodiment of the present application;
fig. 8 is a schematic structural view of a dielectric filter according to a seventh embodiment of the present application;
fig. 9 is a schematic structural view of a dielectric filter according to an eighth embodiment of the present application;
fig. 10 is a schematic structural view of a dielectric filter according to a ninth embodiment of the present application;
fig. 11 is a schematic flow chart of a method of manufacturing a dielectric filter according to a first embodiment of the present application;
fig. 12 is a schematic structural diagram of a communication device according to the first embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dielectric filter according to a first embodiment of the present application. The dielectric filter 10 is applied to a 5G communication system, and the dielectric filter 10 includes a dielectric block 11 and a metal layer (not shown) covering the dielectric block 11.
The dielectric block 11 may be made of a material with light weight, low loss, and high dielectric constant, such as ceramic, glass, or titanate, so that the dielectric filter 10 has the advantages of small volume, low loss, high frequency, high quality factor, and high temperature stability compared to the conventional metal cavity resonator.
At least two dielectric resonators 111 are arranged on the dielectric block 11 at intervals, and the at least two dielectric resonators 111 are connected between the signal input terminal and the signal output terminal. Wherein two grooves 113 are provided between two adjacent dielectric resonators 111, the grooves 113 may extend from at least one side surface of the dielectric block 11 toward the inside of the dielectric block 11, for example, the grooves 113 extend from a first side surface of the dielectric block 11 toward the inside of the dielectric block 11.
As shown in fig. 1, the spacing direction a between two adjacent dielectric resonators 111 may be the central axis direction of the two adjacent dielectric resonators 111. The two grooves 113 are arranged at intervals in the spacing direction a between two adjacent dielectric resonators 111, that is, the two grooves 113 are arranged at intervals in the spacing direction a, and the interval distance is a preset distance value; a coupling window is further defined between two adjacent dielectric resonators 111, that is, the coupling window between two adjacent dielectric resonators 111 may be two grooves 113.
Wherein two grooves 113 are provided on the same side surface of the dielectric block 11, for example, two grooves 113 are provided on a first side surface of the dielectric block 11; the other side surface of the dielectric block 11 opposite to the side surface where the two grooves 113 are located is disposed flatly, for example, the second side surface of the dielectric block 11 is disposed flatly, and the first side surface and the second side surface are disposed on the opposite sides of the dielectric block 11.
The extending direction B of two grooves 113 of the present embodiment may be set perpendicular to the spacing direction a between two adjacent dielectric resonators 111, that is, both grooves 113 are perpendicular to the spacing direction a between two adjacent dielectric resonators 111. Therefore, the two grooves 113 are disposed on the same side surface of the dielectric block 11 in this embodiment, which can improve the out-of-band rejection effect of the far end and improve the performance of the dielectric filter.
The metal layer covers the surface of the dielectric block 11, and the tangential electric field of the metal layer is zero, so the metal layer serves to confine the electromagnetic field within the dielectric block 11 to form standing wave oscillation. The metal layer can be made of silver, copper, aluminum, titanium or gold; for example: the material of the metal layer may be silver, and the silver paste is electrosprayed on the surface of the dielectric body 11 to form the metal layer on the surface of the dielectric body 11; alternatively, the material of the metal layer may be a metal thin film, such as a silver thin film, which is welded on the surface of the dielectric body 11 by electric welding to form the metal layer on the surface of the dielectric body 11.
The present application further provides a dielectric filter of the second embodiment, as shown in fig. 2, the extending direction of two grooves 213 and the spacing direction a between two adjacent dielectric resonators 111 may be obliquely arranged, that is, the included angle between the extending direction of the groove 213 and the spacing direction a is not equal to 90 °.
Wherein, the two grooves 213 are located on the same side surface of the dielectric block 21, for example, the first side surface of the dielectric block 21 is provided with two grooves 213; and the extending directions of the two grooves 213 are away from each other in a direction from the side surface where they are located toward the inside of the dielectric block 11, that is, the extending direction B1 of the groove 213 and the extending direction B2 of the groove 213 are away from each other so that the intersection point of the central axes of the two grooves 213 is C.
Further, the inclination directions of the two grooves 213 with respect to the spacing direction a between the two adjacent dielectric filters 111 are different from each other, that is, the inclination direction of the extending direction B1 of the groove 213 with respect to the spacing direction a is different from the inclination direction of the extending direction B2 of the groove 213 with respect to the spacing direction a, for example, the angle between the extending direction B1 of the groove 213 and the spacing direction a is an acute angle, and the angle between the extending direction B2 of the groove 213 and the spacing direction a is an obtuse angle.
In this embodiment, the extending direction of the two grooves 213 and the spacing direction a between the two adjacent dielectric resonators 111 may be inclined, so as to improve the out-of-band rejection effect at the far end and improve the performance of the dielectric filter.
The present application further provides a dielectric filter of the third embodiment, as shown in fig. 3, two grooves 313 are respectively provided on two side surfaces of the dielectric block 11 between two adjacent dielectric resonators 111 that are oppositely disposed, that is, both the first side surface and the second side surface of the dielectric block 11 between two adjacent dielectric resonators 111 may be provided with two grooves 313.
The extending direction of the two grooves 313 on the first side surface of the dielectric block 11 is perpendicular to the spacing direction a, the extending direction of the two grooves 313 on the second side surface of the dielectric block 11 is also perpendicular to the spacing direction a, and at this time, the two grooves 313 on the first side surface of the dielectric block 11 and the two grooves 313 on the second side surface of the dielectric block 11 are symmetrically arranged.
The present application further provides a dielectric filter of the fourth embodiment, as shown in fig. 4, two grooves 413 are respectively disposed on two side surfaces of the dielectric block 11 between two adjacent dielectric resonators 111, which are disposed oppositely, that is, two grooves 413 may be disposed on both the first side surface and the second side surface of the dielectric block 11 between two adjacent dielectric resonators 111, which are disposed oppositely.
The extending direction of the two grooves 413 on the two side surfaces of the dielectric block 11 is inclined to the spacing direction a between the two adjacent dielectric resonators 111, that is, the two grooves 413 on the first side surface of the dielectric block 11 are inclined to the spacing direction a, and the two grooves 413 on the second side surface of the dielectric block 11 are inclined to the spacing direction a; and the extending directions of the two grooves 413 on the same side surface are deviated from each other in the direction of the side surface where the grooves 413 are located toward the inside of the dielectric block 11, that is, the extending directions of the two grooves 413 on the first side surface of the dielectric block 11 are deviated from each other, and the intersection point of the central axes of the two grooves 413 is C; the extending directions of the two grooves 413 of the second side surface of the dielectric block 11 are away from each other, and the intersection point of the central axes of the two grooves 413 is D.
A connecting line between the intersection point of the central axes of the two grooves 413 on the one side surface of the dielectric block 11 and the intersection point of the central axes of the two grooves 413 on the other side surface is perpendicular to the spacing direction a between the two adjacent dielectric resonators 111, that is, the intersection point of the central axes of the two grooves 413 on the first side surface of the dielectric block 11 is C, the intersection point of the central axes of the two grooves 413 on the second side surface of the dielectric block 11 is D, and the connecting line CD is perpendicular to the spacing direction a between the two adjacent dielectric resonators 111.
The present application further provides a dielectric filter of the fifth embodiment, as shown in fig. 5, the two recesses 513 have different depths in the respective extending directions, that is, the two recesses 513 on the same side surface of the dielectric block 11 have different depths in the respective extending directions, that is, the two recesses 513 have different depths.
The two grooves 513 of the present embodiment have different depths in the extending directions, and the depth of the groove 513 in the extending direction can be adjusted to adjust a coupling parameter, such as a coupling bandwidth, between two adjacent dielectric resonators 111.
In other embodiments, as shown in fig. 6, at least three dielectric resonators 611, 612 and 613 are arranged on the dielectric block 11 at intervals, two grooves 614 between every two adjacent dielectric resonators are alternately arranged on two side surfaces of the dielectric block 11 which are oppositely arranged, that is, two grooves 614 between the adjacent dielectric resonators 611 and 612 are arranged on a first side surface of the dielectric block 11, two grooves 614 between the adjacent dielectric resonators 612 and 613 are arranged on a second side surface of the dielectric block 11, and the first side surface and the second side surface are oppositely arranged.
The present application provides a dielectric filter of a sixth embodiment, and as shown in fig. 7, the dielectric filter 80 is applied to a 5G communication system, the dielectric filter 80 includes at least a circuit board 81 and an electromagnetic shield layer 82, the circuit board 81 includes a core body 811 and metal foils 812 provided on two main surfaces of the core body 811 opposite to each other, for example, a first main surface and a second main surface of the core body 811 are provided with the metal foils 812, and the first main surface and the second main surface are arranged opposite to each other.
The metal foil 812 may be made of a metal material such as silver, copper, aluminum, titanium, or gold, for example: the material of the metal foil 812 may be copper, and copper paste is formed on the first and second main surfaces of the core body 811 by electro-spraying to form the metal foil 812 on the main surface of the core body 811; alternatively, copper paste is coated on the first and second main surfaces of the board core body 811 to form the metal foil 812 on the main surface of the board core body 811.
Among them, the circuit board 81 may be processed into a predetermined filter shape, that is, the core body 811 is processed into a predetermined filter shape, and then the metal foils 812 are provided on both main surfaces of the core body 811 opposite to each other.
The electromagnetic shielding layer 82 is disposed on the side surfaces of the core body 811 exposed by the metal foils 812 on both sides, that is, the metal foils 812 are disposed on the first main surface and the second main surface of the core body 811, the electromagnetic shielding layer 82 is disposed on the side surfaces of the core body 811, and the material of the electromagnetic shielding layer 82 may be the same as that of the metal foils 812. The core body 811 may be made of a lightweight, low loss, high dielectric constant material such as ceramic, glass, or titanate.
In the manufacturing process of the dielectric filter 80, the circuit board 81 is manufactured in batch, and compared with the existing ceramic filter which needs to be integrally formed, the circuit board 81 does not need to relate to a complex process of ceramic dielectric forming, so that the production efficiency is improved; then, the circuit board 81 is cut and punched to process the circuit board 81 into a preset filter shape, and compared with the existing mold forming, the method has the advantages of no need of a mold, short production period, low cost, improvement of processing precision and realization of large-scale production; finally, the circuit board 81 which is cut and punched is provided with the metal foil 812 and the electromagnetic shielding layer 82, waste caused by the metal foil 812 and the electromagnetic shielding layer 82 can be avoided, the cost is reduced, and in addition, cooperative circuits such as a low-pass filter of the circuit board 81 can be processed at the same time, and integration is easy.
Wherein, a groove 813 for defining a coupling window is further processed on the side surface of the board core body 811, so that the circuit board 81 includes at least two resonance units cascaded by the coupling window. The recess 813 may be a recess disclosed in the above embodiment, the resonant unit is a dielectric resonator of the above embodiment, and the board core body 811 is the dielectric block 11 of the above embodiment, which is not described herein again.
Tuning holes 815 and/or coupling holes 816 are formed on one main surface of the core body 811 and the metal foil 812 thereof, and the dielectric filter 80 further includes tuning screws and/or coupling screws inserted into the tuning holes 815 and/or the coupling holes 816. For example, the first major surface of the core body 811 and its metal foil 812 are provided with tuning holes 815 or coupling holes 816.
The dielectric filter 80 of the embodiment includes the circuit board 81 and the electromagnetic shielding layer 82, and the circuit board 81 is processed into the dielectric filter by mass production of the circuit board 81, so that the processing precision is improved, the size deviation of the dielectric filter is avoided, and the stop band rejection capability of the dielectric filter 80 can be improved.
The tuning hole 815 and the tuning screw are described in detail below, the coupling hole 816 and the tuning hole 815 have the same structure, and the coupling screw and the tuning screw have the same structure, which is not described herein again.
The present application further provides the dielectric filter of the seventh embodiment, as shown in fig. 8, the tuning hole 815 of the dielectric filter 80 includes a first hole section 8151 and a second hole section 8152 arranged along an axis of the tuning hole 815, and a cross-sectional area of the first hole section 8151 perpendicular to the axis is larger than a cross-sectional area of the second hole section 8152 perpendicular to the axis, that is, a cross-sectional shape of the tuning hole 815 along the axis may be a stepped shape. In other embodiments, the tuning bore 815 may be provided with other numbers of bore segments along the axis, such as 3 bore segments, 5 bore segments.
Since the cross-sectional area of the first bore section 8151 perpendicular to the axis is larger than the cross-sectional area of the second bore section 8152 perpendicular to the axis, the junction of the first bore section 8151 and the second bore section 8152 forms a first bearing platform.
The dielectric filter 80 further includes a first nut 83 and a first tuning screw 84, the first tuning screw 84 being a tuning screw inserted into the tuning hole 815. The first nut 83 is arranged on the first bearing platform, that is, the first nut 83 can be fixed on the first bearing platform by electric welding or gluing; the first tuning screw 84 is disposed within the tuning bore 815 via the first nut 83, i.e., the first tuning screw 84 can be rotated relative to the first nut 83 to adjust the length of the first tuning screw 84 within the second bore section 8152.
The cross-sectional area of the first nut 83 perpendicular to the axis may be equal to or less than the cross-sectional area of the first bore section 8151, and the shape of the cross-section of the first nut 83 may be the same as the shape of the cross-section of the first bore section 8151, for example, the shape of the cross-section of the first nut 83 may be hexagonal or circular. In other embodiments, the cross-sectional shape of the first nut 83 is different from the cross-sectional shape of the first bore section 8151, such as the cross-sectional shape of the first bore section 8151 is circular and the cross-sectional shape of the first nut 83 is hexagonal. The present embodiment can adjust the parameters of the dielectric filter 80 by the first tuning screw 84.
Specifically, the longer the length of the first tuning screw 84 located within the second bore section 8152, the lower the resonant frequency of the dielectric resonator 80; the shorter the length of the first tuning screw 84 within the second bore section 8152, the higher the resonant frequency of the dielectric resonator 80.
The first nut 83 and the first tuning screw 84 of the present embodiment are disposed in the tuning hole 815, so as to prevent the first nut 83 and the first tuning screw 84 from protruding from the circuit board 81, reduce the thickness of the dielectric resonator 80, and further reduce the volume of the dielectric resonator 80.
The present application provides a dielectric resonator of an eighth embodiment, as shown in fig. 9, in which a first rod section 841 and a second rod section 842 are arranged along an axis of a first tuning screw 84, and a cross-sectional area of the first rod section 841 perpendicular to the axis is smaller than a cross-sectional area of the second rod section 842 perpendicular to the axis. Compared with a tuning screw with a constant diameter, in the embodiment, the cross-sectional area of the second rod section 842 is set to be larger than that of the first rod section 841, so that the gap between the second rod section 842 and the second hole section 8152 is reduced, and the leakage of the electromagnetic field of the dielectric resonator 80 can be reduced.
The material of the surface of the first tuning screw 84 may be a metal material, and specifically, may be a metal material such as silver, copper, aluminum, titanium, or gold. Further, the material of other regions of the first tuning screw 84 may be a non-metallic material, such as plastic or the like. In contrast to the prior art tuning screw made entirely of a metallic material, the first tuning screw 84 of the present application is made of a metallic material in the surface and non-metallic in other areas to reduce cost.
The cross-sectional area of the second rod segment 842 perpendicular to the axis may be equal to the cross-sectional area of the second hole segment 8152 perpendicular to the axis, so that the gap between the second rod segment 842 and the second hole segment 8152 can be further reduced, and leakage of an electromagnetic field of the dielectric resonator can be avoided.
The first rod section 841 is provided with a thread, and the second rod section 842 can adopt a smooth design, that is, the outer surface of the second rod section 842 is smooth, so that the second rod section 842 is tightly matched with the second hole section 8152, the thread of the first tuning screw 84 can be prevented from wearing the inner wall of the tuning hole 815, and the performance index of the dielectric filter is improved.
Furthermore, the first rod section 841 may be partially threaded, i.e. the end of the first rod section 841 near the first nut 63 is threaded, and the end of the first rod section 841 near the second rod section 842 is of smooth design, thereby ensuring that the thread of the first rod section 841 does not extend into the second bore section 8152.
The present application provides the dielectric resonator of the ninth embodiment, as shown in fig. 10, the tuning aperture 815 further includes a third aperture section 816, and a cross-sectional area of the second aperture section 8152 perpendicular to the axis is larger than a cross-sectional area of the third aperture section 816 perpendicular to the axis, so that a junction of the second aperture section 8152 and the third aperture section 816 forms a second stage.
Wherein the dielectric resonator 80 further comprises a second nut 85 and a second tuning screw 86, the second nut 85 is disposed on the second bearing platform, and the second tuning screw 86 is disposed in the tuning hole 815 through the second nut 85; the second nut 85 is the same as the first nut 83, and the second tuning screw 86 is the same as the first tuning screw 84, which are not described herein again.
The present application further provides a method for manufacturing a dielectric filter according to the first embodiment, which is described on the basis of the dielectric filter 80 disclosed in the sixth embodiment, as shown in fig. 11, and the method includes the steps of:
s201: a circuit board is provided, which includes a board core body and metal foils disposed on two main surfaces of the board core body opposite to each other.
As shown in fig. 7, a circuit board 81 is provided, in which the circuit board 81 includes a core body 811 and metal foils 812 provided on two main surfaces of the core body 811 opposed to each other, for example, a first main surface and a second main surface of the core body 811 are provided with the metal foils 812, and the first main surface and the second main surface are opposed.
S202: and machining the circuit board into a preset filter shape in a machining mode.
The circuit board 81 is machined by a machining method, for example, the circuit board 81 is cut and punched by the machining method, so that the machined circuit board 81 has a predetermined filter shape.
S203: an electromagnetic shield layer is formed on the side surface of the core body exposed by the metal foils on both sides.
The electromagnetic shielding layer 82 is disposed on the side surfaces of the core body 811 exposed by the metal foils 812 on both sides, that is, the metal foils 812 are disposed on the first main surface and the second main surface of the core body 811, the electromagnetic shielding layer 82 is disposed on the side surfaces of the core body 811, and the material of the electromagnetic shielding layer 82 may be the same as that of the metal foils 812.
Compared with the existing ceramic filter which needs to be integrally formed, the method does not need a complex process for forming the ceramic dielectric, improves the production efficiency, does not need a die, shortens the production period, reduces the cost and improves the processing precision.
The present application further provides a communication device of the first embodiment, as shown in fig. 12, the communication device 100 is applied to a 5G communication system, the communication device 100 includes an antenna 101 and a dielectric filter 102, the antenna 101 is coupled to the dielectric filter 102, and the dielectric filter 102 is the dielectric filter disclosed in the foregoing embodiments and is not described herein again. The communication device 100 may be a base station or a terminal for a 5G communication system, and the terminal may specifically be a mobile phone, a tablet computer, a wearable device with a 5G communication function, and the like.
It should be noted that the above embodiments belong to the same inventive concept, and the description of each embodiment has a different emphasis, and reference may be made to the description in other embodiments where the description in individual embodiments is not detailed.
The protection circuit and the control system provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (12)
1. A dielectric filter for use in a 5G communication system, the dielectric filter comprising:
a circuit board including a core body and metal foils provided on two main surfaces of the core body opposite to each other, wherein the circuit board is processed into a predetermined filter shape;
and the electromagnetic shielding layer is arranged on the side surface of the plate core body exposed by the metal foils on two sides.
2. The dielectric filter of claim 1, wherein at least one major surface of the core body and the metal foil thereof are formed with tuning holes and/or coupling holes, and the dielectric filter further comprises tuning screws and/or coupling screws inserted into the tuning holes and/or coupling holes.
3. A dielectric filter as claimed in claim 1, wherein a recess is machined in a side surface of the core body to define a coupling window, so that the circuit board includes at least two resonant cells cascaded by the coupling window.
4. A dielectric filter according to claim 3, wherein two of the grooves extending to the inside of the core body on the side surface of the core body are provided at a distance from each other in the direction of the interval between the adjacent two of the resonance units.
5. A dielectric filter as recited in claim 4, wherein the two grooves extend in a direction perpendicular to the spacing direction.
6. A dielectric filter as recited in claim 4, wherein the two grooves extend obliquely to the spacing direction.
7. A dielectric filter as claimed in claim 6, characterized in that the two grooves are located on the same side surface, the extending directions of the two grooves being away from each other in a direction from the side surface where they are located toward the inside of the core body.
8. The dielectric filter according to claim 6, wherein the inclination directions of the two grooves with respect to the spacing direction are different from each other.
9. A dielectric filter as claimed in claim 4, characterized in that the two grooves differ from each other in depth in the respective direction of extension.
10. The dielectric filter according to claim 4, wherein the two grooves are provided on the same side surface of the core body; the other side surface of the plate core body, which is opposite to the side surfaces where the two grooves are located, is arranged in a flat mode.
11. A communication device for use in a 5G communication system, the communication device comprising an antenna and a dielectric filter according to any one of claims 1-10, the antenna being coupled to the dielectric filter.
12. A method of manufacturing a dielectric filter, the method comprising:
providing a circuit board, wherein the circuit board comprises a board core body and metal foils arranged on two main surfaces of the board core body, wherein the two main surfaces are opposite to each other;
machining the circuit board into a preset filter shape in a machining mode;
forming an electromagnetic shielding layer on a side surface of the core body exposed by the metal foils on both sides.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNPCT/CN2018/125880 | 2018-12-29 | ||
| CN2018125880 | 2018-12-29 |
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| CN111384483A true CN111384483A (en) | 2020-07-07 |
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| CN201910208717.8A Withdrawn CN111384483A (en) | 2018-12-29 | 2019-03-19 | Dielectric filter applied to 5G communication system, manufacturing method thereof and communication equipment |
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| DE69809811T2 (en) * | 1997-01-29 | 2003-09-11 | Murata Manufacturing Co | Dielectric filter and dielectric duplexer |
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| CN103618122A (en) * | 2013-12-16 | 2014-03-05 | 武汉凡谷电子技术股份有限公司 | Dielectric waveguide filter |
| CN107359392A (en) * | 2017-02-07 | 2017-11-17 | 四川省韬光通信有限公司 | Reduce the method for dielectric waveguide filter passive intermodulation and the low passive intermodulation dielectric waveguide filter of application this method production |
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| JPH03265302A (en) * | 1990-03-15 | 1991-11-26 | Ube Ind Ltd | Distribution constant filter |
| DE69809811T2 (en) * | 1997-01-29 | 2003-09-11 | Murata Manufacturing Co | Dielectric filter and dielectric duplexer |
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| CN103618122A (en) * | 2013-12-16 | 2014-03-05 | 武汉凡谷电子技术股份有限公司 | Dielectric waveguide filter |
| CN107359392A (en) * | 2017-02-07 | 2017-11-17 | 四川省韬光通信有限公司 | Reduce the method for dielectric waveguide filter passive intermodulation and the low passive intermodulation dielectric waveguide filter of application this method production |
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