CN112542665A - Multimode dielectric filter and multimode cascade filter - Google Patents
Multimode dielectric filter and multimode cascade filter Download PDFInfo
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- CN112542665A CN112542665A CN202011283022.5A CN202011283022A CN112542665A CN 112542665 A CN112542665 A CN 112542665A CN 202011283022 A CN202011283022 A CN 202011283022A CN 112542665 A CN112542665 A CN 112542665A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/087—Transitions to a dielectric waveguide
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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
- H01P7/105—Multimode resonators
Abstract
The present invention provides a multimode dielectric filter, comprising: the multimode dielectric resonant cavity comprises a solid dielectric body and a metal coating wrapping the outer surface of the dielectric body; the metal transmission line is spaced from the dielectric resonant cavity by a dielectric material; the multimode dielectric resonant cavity is coupled with the metal transmission line through the coupling structure so as to form a transmission zero point at any side of the transmission channel and simultaneously form a plurality of (two or more) resonant frequencies in a pass band. The invention provides a multimode dielectric filter and a cascade multimode filter, which can realize transmission zero point by adopting direct coupling between a multimode dielectric resonant cavity and a metal transmission line without cross coupling among multiple cavities; meanwhile, each multimode dielectric resonator can realize a plurality of resonant frequencies so as to simplify the structure of the dielectric filter.
Description
Technical Field
The invention relates to the field of filters, in particular to a multimode dielectric filter and a multimode cascade filter.
Background
Fig. 1 is a schematic structural diagram of a conventional multimode cascade filter. As shown in fig. 1, the cascade filter includes 2 three- mode resonators 310 and 350 and 1 two-mode resonator 330, wherein the frequency tuning directions of the three-mode resonators are 3 orthogonal directions, such as the extending directions of the resonance screws 311, 312 and 313 in the figure, and the frequency tuning directions of the two-mode resonator 330 are 2 directions, such as the extending directions of the resonance screws 331 and 333 in the figure.
In the cascaded filter, the coupling between each 2 orthogonal modes in the same three-mode or two-mode resonator requires a special structural shape, generally a concave structure, such as grooves 315, 335, to be made at the right-angled side of the resonator (45 ° direction of the intersection between the 2 modes) for adjusting the amount of coupling between the 2 orthogonal modes in the same resonator. The manufacturing process of the special concave coupling structure is complex, the insertion loss of the filter is influenced, and the special concave structure is difficult to adjust and needs to be debugged from the 45-degree side, so that the production process is complex.
Further, the coupling between different dual-mode or triple-mode resonators (including adjacent coupling and non-adjacent cross coupling) requires the insertion of a coupling diaphragm, such as diaphragms 320, 340, having a cross coupling slot in the middle for coupling the modes between 2 dual-mode dielectric resonators in two mutually perpendicular directions, including adjacent coupling and non-adjacent coupling (for generating transmission zeros). The coupling diaphragms in the mode are generally welded among 2 multi-mode resonant cavities, the process is very complex, and once the coupling diaphragms are welded, the coupling amount cannot be adjusted, so that the multi-mode dielectric filter produced in the mode has low yield and poor adjustability, and the expected insertion loss (s21) and echo (s11) indexes are difficult to achieve.
Therefore, the conventional multimode filter has disadvantages in that: (1) coupling structures among different modes among the same multimode resonator are complex; (2) the adjacent coupling and cross coupling process between different multimode resonators is difficult to realize, and the product performance and the qualification rate are influenced finally.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multimode dielectric filter and a multimode cascade filter, which can realize transmission zero point by adopting direct coupling between a dielectric resonant cavity and a metal transmission line, do not need cross coupling among multiple cavities, can realize adjacent coupling of different modes between the same multimode resonator by direct connection of the metal transmission line, and can greatly simplify the structure of the multimode dielectric filter.
In one embodiment, there is provided a multimode dielectric filter comprising:
the dielectric resonant cavity comprises a dielectric body and a metal coating wrapping the outer surface of the dielectric body, wherein the dielectric body is in a cuboid shape, the outer surface of the dielectric body comprises a pair of first surfaces arranged in parallel, a pair of second surfaces arranged in parallel and a pair of third surfaces arranged in parallel, and the first surfaces, the second surfaces and the third surfaces are orthogonal to each other;
a coupling structure comprising a first coupling structure and a second coupling structure extending from one of the first and second surfaces, respectively, into the dielectric body;
the metal transmission line is formed by connecting a plurality of metal transmission line branches, the two ends of the metal transmission line are respectively a signal input end and a signal output end, each metal transmission line branch comprises a first metal transmission line branch and a second metal transmission line branch which are connected, the first metal transmission line branch is arranged on the outer side of a first surface corresponding to the first coupling structure, and the second metal transmission line branch is arranged on the outer side of a second surface corresponding to the second coupling structure;
the first coupling structure is connected with the first metal transmission line branch, and the dielectric resonant cavity is coupled with the first metal transmission line branch through the first coupling structure so as to form a first resonant frequency in the extending direction of the first coupling structure and form a first transmission zero point on any side of the transmission channel;
the second coupling structure is connected with the second metal transmission line branch, and the dielectric resonant cavity is coupled with the second metal transmission line branch through the second coupling structure so as to form a second resonant frequency in the extending direction of the second coupling structure and form a second transmission zero point on any side of the transmission channel.
In a preferred embodiment of the present invention,
the coupling structure further comprises a third coupling structure extending from a third surface into the dielectric body;
the metal transmission line branches further comprise a third metal transmission line branch, the first metal transmission line branch, the second metal transmission line branch and the third metal transmission line branch are connected to form a metal transmission line, and the third metal transmission line branch is arranged on the outer side of a third surface corresponding to the third coupling structure;
the third coupling structure is connected with the third metal transmission line branch, and the dielectric resonant cavity is coupled with the third metal transmission line branch through the third coupling structure so as to form a third resonant frequency in the extension direction of the third coupling structure and form a third transmission zero point on any side of the transmission channel.
In a preferred embodiment of the present invention,
two ends of each metal transmission line branch respectively correspond to two side edge positions of one corresponding outer surface.
In a preferred embodiment, further comprising:
the circuit board is attached to the outer surface of the medium body corresponding to the coupling structure, and the metal transmission line branch is arranged on the surface of one side, away from the medium resonant cavity, of the circuit board.
In a preferred embodiment, the first end of the coupling structure is embedded in the dielectric body,
the first end is not electrically connected with the metal coating on the surface of the medium resonant cavity so as to form a capacitive transmission zero point; or
The first end is electrically connected with the metal coating on the surface of the medium resonant cavity to form an inductive transmission zero point.
In a preferred embodiment, the second end of the coupling structure penetrates through the circuit board from a side surface of the circuit board facing the dielectric resonant cavity to be electrically connected with the metal transmission line.
In a preferred embodiment, a side surface of the circuit board facing the dielectric resonant cavity further comprises an insulating layer surrounding the second end to signal-insulate the coupling structure from the circuit board.
In a preferred embodiment, the circuit board further comprises a metal via penetrating through the circuit board, and the second end of the coupling structure is electrically connected with a side surface of the circuit board facing the dielectric resonant cavity so as to be in signal connection with the metal transmission line through the metal via.
Another embodiment of the present invention further provides a multimode cascade filter, including:
a plurality of multi-mode dielectric filters as described above,
the medium resonant cavities of the multimode medium filters are arranged side by side one by one, and the adjacent two multimode medium filters realize adjacent coupling of the resonant frequency of any one direction of each of the two multimode medium filters by directly connecting the signal output end of one of the multimode medium filters with the signal input end of the other multimode medium filter.
In a preferred embodiment, the multimode dielectric filter further comprises:
the circuit board is attached to the outer surface of the medium body corresponding to the coupling structure, and the metal transmission line branch is arranged on the surface of one side of the circuit board, which is far away from the medium resonant cavity;
in two adjacent multimode dielectric filters, the circuit board where the signal output end of one multimode dielectric filter is located and the circuit board where the signal input end of the other multimode dielectric filter is located are arranged in the same plane side by side or attached to each other.
As can be seen from the above technical solutions, in the present embodiment, the directional resonant frequency is realized by the dielectric resonator 10 and a metal transmission line branch through a coupling structure connected therebetween, and the metal transmission line branch and the coupling structure are in one-to-one correspondence. The adjacent coupling of two orthogonal resonant frequencies is converted into the connection of two metal transmission line branches, and the three-dimensional structure is converted into a planar structure, so that the complexity is greatly reduced, therefore, the adjacent coupling structure of the multimode dielectric filter in the embodiment is simple, and the complexity that the coupling structure needs to be arranged in the direction of crossing 45 degrees in the prior art is avoided.
Further, in the multimode dielectric filter of the present embodiment, only one dielectric resonator 10 is included, the coupling mode is not a mode of establishing cross coupling between different resonators, but a mode of coupling a dielectric resonator and a metal transmission line (microstrip line, etc.) in which the resonators and non-resonators are coupled to each other is adopted, wherein two ends of the metal transmission line 30 are open, so as to form a non-closed resonant node, which forms a resonant peak in a transmission channel and a transmission zero on any side of the transmission channel. The mode of mutual coupling of the resonant cavity and the non-resonant cavity enables the dielectric filter to generate a transmission zero point without cross coupling with other dielectric filters, thereby omitting a structure for realizing cross coupling in the prior art and further reducing the complexity of a coupling structure.
In the multimode cascade filter of this embodiment, each multimode dielectric filter forms a transmission zero point by coupling the dielectric resonator with the metal transmission line (microstrip line, etc.) in a manner that the resonator and the non-resonator are coupled with each other, so when any two or more multimode dielectric filters are coupled, it is only necessary to perform adjacent coupling on the resonant frequency of each multimode dielectric filter in any one direction, and the adjacent coupling can be realized only by directly connecting the input end and the output end of the metal transmission line.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a schematic structural diagram of a conventional multimode cascade filter.
Fig. 2 is a schematic structural view of a first embodiment of the multimode dielectric filter of the invention.
Fig. 3 is a sectional view of the multimode dielectric filter of fig. 1.
Fig. 4 is a waveform diagram of the multimode dielectric filter of fig. 1.
Fig. 5 is a schematic structural view of a second embodiment of the multimode dielectric filter of the invention.
Fig. 6 is a schematic structural view of a first embodiment of a coupling structure in the multimode dielectric filter of the invention.
Fig. 7 is a schematic structural view of a second embodiment of a coupling structure in the multimode dielectric filter of the invention.
Fig. 8 is a schematic structural diagram of a first embodiment of the multimode cascade filter of the present invention.
Fig. 9 is a schematic structural diagram of a second embodiment of the multimode cascade filter of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, the premise that each other exists, and the like.
In this context, "equal", "same", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances as would be understood by a person skilled in the art and allowed for manufacturing or use, etc. Unless otherwise indicated, numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges subsumed therein.
Example embodiments will now be described more fully with reference to the accompanying drawings.
In order to solve the problems in the prior art, the invention provides a multimode dielectric filter and a multimode cascade filter, which can realize transmission zero point by adopting direct coupling between a dielectric resonant cavity and a metal transmission line, do not need cross coupling among multiple cavities, can realize adjacent coupling of different modes between the same multimode resonator by direct connection of the metal transmission line, and can greatly simplify the structure of the multimode dielectric filter.
As shown in fig. 2 and 3, an embodiment of the present invention provides a dual-mode dielectric filter including:
a dielectric resonator 10, the dielectric resonator 10 includes a dielectric body 11 and a metal coating 12 wrapping an outer surface of the dielectric body 11, wherein the dielectric body 11 is in a shape of a rectangular parallelepiped, preferably a cube, and the outer surface includes a pair of first surfaces 11a disposed in parallel, a pair of second surfaces 11b disposed in parallel, and a pair of third surfaces 11c disposed in parallel, wherein the first surfaces 11a, the second surfaces 11b, and the third surfaces 11c are orthogonal to each other;
a coupling structure 40, the coupling structure 40 including a first coupling structure 40a and a second coupling structure 40b, the first coupling structure 40a and the second coupling structure 40b extending from one of the first surfaces 11a and one of the second surfaces 11b, respectively, toward the medium body 11;
the metal transmission line 30 is formed by connecting a plurality of metal transmission line branches, two ends of the metal transmission line 30 are respectively a signal input end 30a and a signal output end 30b, the metal transmission line branches comprise a first metal transmission line branch 31 and a second metal transmission line branch 32 which are connected, the first metal transmission line branch 31 is arranged on the outer side of a first surface 11a corresponding to the first coupling structure 40a, and the second metal transmission line branch 32 is arranged on the outer side of a second surface 11b corresponding to the second coupling structure 40 b;
the first coupling structure 40a is connected to the first metal transmission line branch 31 so that the dielectric resonator 10 is coupled to the first metal transmission line branch 31 through the first coupling structure 40a to form a first resonance frequency in the extending direction of the first coupling structure 40a and to form a first transmission zero on either side of the transmission channel;
the second coupling structure 40b is connected to the second metal transmission line branch 32 such that the dielectric resonator 10 is coupled to the second metal transmission line branch 32 through the second coupling structure 40b to form a second resonance frequency in the extending direction of the second coupling structure 40b and to form a second transmission zero at either side of the transmission channel.
In the present embodiment, the directional resonant frequency is realized by the dielectric resonator 10 and a metal transmission line branch through a coupling structure connected therebetween, and the metal transmission line branch and the coupling structure are in one-to-one correspondence. In the dielectric filter of this embodiment, only one dielectric resonator 10 is included, the coupling mode is not a mode of establishing cross coupling between different resonators, but a mode of coupling a dielectric resonator and a metal transmission line (microstrip line, etc.) in which the resonators and non-resonators are coupled to each other is adopted, wherein two ends of the metal transmission line 30 are open, so as to form a non-closed resonant node, which forms a resonant peak in a transmission channel and a transmission zero point on any side of the transmission channel. In the extending direction of the coupling structure 40, the coupling structure 40 resonates the signal of the metal transmission line in a mode exciting a specific direction in the dielectric resonant cavity, thereby generating a corresponding one of the resonant frequencies in the extending direction thereof.
Further, the dielectric body 11 of the dielectric resonator 10 takes the form of a rectangular parallelepiped or cube having three sets of mutually orthogonal surfaces — a pair of first surfaces 11a, a pair of second surfaces 11b, and a pair of third surfaces 11c, with the coupling structure extending perpendicularly inward from two of the three sets of surfaces, thereby obtaining two mutually orthogonal resonant frequencies.
Specifically, in the present embodiment, the first coupling structure 40a extends vertically from a first surface 11a toward the inside of the dielectric body 11, and the first coupling structure 40a is connected to the first metal transmission line branch 31, so that the dielectric resonator 10 is coupled to the first metal transmission line branch 31 through the first coupling structure 40a to form a first resonant frequency in the extending direction of the first coupling structure 40a, and at the same time, a first transmission zero is formed on any side of the transmission channel. And the second coupling structure 40b extends vertically from a second surface 11b toward the inside of the dielectric body 11, and the second coupling structure 40b is connected to the second metal transmission line branch 32, so that the dielectric resonator 10 is coupled to the second metal transmission line branch 32 through the second coupling structure 40b to form a second resonance frequency in the extending direction of the second coupling structure 40b, and at the same time, a second transmission zero is formed at either side of the transmission channel. Wherein the resonance directions of the first resonance frequency and the second resonance frequency are orthogonal to each other.
While the adjacent coupling of the first and second resonance frequencies is achieved by the connection of the first and second metal transmission line branches 31 and 32. Therefore, the adjacent coupling of two orthogonal resonant frequencies is converted into the connection of two metal transmission line branches, the three-dimensional structure is converted into a planar structure, and the complexity is greatly reduced, so that the adjacent coupling structure of the multimode dielectric filter in the embodiment is simple, and the complexity that the coupling structure needs to be arranged in the direction of crossing 45 degrees in the prior art is avoided.
Further, in the multimode dielectric filter of the present embodiment, only one dielectric resonator 10 is included, the coupling mode is not a mode of establishing cross coupling between different resonators, but a mode of coupling a dielectric resonator and a metal transmission line (microstrip line, etc.) in which the resonators and non-resonators are coupled to each other is adopted, wherein two ends of the metal transmission line 30 are open, so as to form a non-closed resonant node, which forms a resonant peak in a transmission channel and a transmission zero on any side of the transmission channel. The mode of mutual coupling of the resonant cavity and the non-resonant cavity enables the dielectric filter to generate a transmission zero point without cross coupling with other dielectric filters, thereby omitting a structure for realizing cross coupling in the prior art and further reducing the complexity of a coupling structure.
In a conventional dielectric filter, transmission zeros need to be realized by a coupling structure between non-adjacent resonators, that is, one transmission zero needs to be realized by a dielectric filter composed of at least three resonators, and a cross-coupling (mostly negative coupling) structure needs to be arranged between the resonators. Because transmission zero needs to be coupled between two non-adjacent resonant cavities, the resonant cavities of the conventional dielectric filter are mostly arranged in a zigzag, S-shaped or U-shaped manner. Taking a dielectric filter composed of three resonant cavities as an example, three resonant peaks can be formed in the transmission channel, but only one transmission zero is formed.
In the present embodiment, the metal transmission line 30 is usually a metalized line disposed on the surface of the circuit board 20, and it may be formed on the same circuit board 20 with the filter circuit of the dielectric filter, that is, the dielectric filter of the present embodiment may form a plurality of independent transmission zeros only by one multi-mode dielectric resonator and its accessory circuits, so as to optimize the filtering performance of the filter.
In one embodiment, in order to optimize the structure of the metal transmission line 30, as shown in fig. 2, two ends of each metal transmission line branch respectively correspond to two side positions of one corresponding outer surface. In the present embodiment, the metal transmission line branch is generally a metallization line disposed on the surface of the circuit board 20, as shown in fig. 3, the circuit board 20 may be disposed at the outer surface of the dielectric body 11 corresponding to the coupling structure 40, and the circuit board 20 may be attached to the outer surface or isolated by an air layer. Wherein, preferably, the metal transmission line branch can be disposed on a side surface of the circuit board 20 facing away from the dielectric resonant cavity 10 so as to be isolated from the dielectric resonant cavity 10 by the dielectric material.
Specifically, in the dual-mode dielectric filter of the present embodiment, the circuit board 20 includes a first circuit board 20a and a second circuit board 20b, where the first circuit board 20a is attached to the first surface 11a, and the first metal transmission line branch 31 is disposed on a side surface of the first circuit board 20a away from the dielectric resonator 10. The first circuit board 20a may have a size corresponding to the first surface 11a, and two ends of the first metal transmission line branch 31 respectively correspond to two sides of the first surface 11 a. Wherein, the two sides can be two adjacent sides or two non-adjacent sides. That is, the extending direction and shape of the first metal wire branch 31 may be various forms such as a straight line, a broken line, a curved line, etc. Similarly, the second circuit board 20b is attached to the second surface 11b, and the second metal transmission line branch 32 is disposed on a side surface of the second circuit board 20b facing away from the dielectric resonator 10. The second circuit board 20b may have a size corresponding to the second surface 11b, and two ends of the second metal transmission line branch 32 respectively correspond to two sides of the second surface 11 b.
The first surface 11a and the second surface 11b are necessarily adjacent according to the shape characteristics of the cube, and by setting the extending directions of the first metal transmission line branch 31 and the second metal transmission line branch 32, the connection coupling of the first metal transmission line branch 31 and the second metal transmission line branch 32 can be very easily achieved, thereby conveniently achieving the adjacent coupling of two resonance frequencies orthogonal to each other.
Referring to fig. 4, the multimode dielectric filter as shown in fig. 2 may have two resonance frequencies, and two transmission zeros are respectively generated corresponding to the two resonance frequencies.
Fig. 5 shows another embodiment of the present invention in which the present invention provides a three mode dielectric filter. Referring to fig. 5 and fig. 2, the three-mode dielectric filter of fig. 5 is based on the two-mode dielectric filter of fig. 2, and a set of metal transmission line branches and coupling structures are added, so that a new resonant frequency is introduced.
Specifically, the coupling structure 40 further includes a third coupling structure 40c, the third coupling structure 40c extending from a third surface 11c toward the inside of the dielectric body 11;
the metal transmission line branches further include a third metal transmission line branch 33, the first metal transmission line branch 31, the second metal transmission line branch 32 and the third metal transmission line branch 33 are connected to form a metal transmission line 30, and the third metal transmission line branch 33 is disposed outside one third surface 11c corresponding to the third coupling structure 40 c;
the third coupling structure 40c is connected to the third metal transmission line branch 33 such that the dielectric resonator 10 is coupled to the third metal transmission line branch 33 through the third coupling structure 40c to form a third resonant frequency in the extending direction of the third coupling structure 40c, and to form a third transmission zero on either side of the transmission channel.
Likewise, three mutually orthogonal resonant frequencies are coupled together by connections of metallic transmission line branches. Specifically, the metal transmission line 30 is formed by connecting a first metal transmission line branch 31, a second metal transmission line branch 32 and a third metal transmission line branch 33, the three metal transmission line branches are sequentially connected to form a complete transmission line, and two ends of the complete transmission line form a signal input end 30a and a signal output end 30b of the metal transmission line 30.
For example, in the present embodiment, the first end of the first metal transmission line branch 31 is open to serve as the signal input terminal 30a, the second end of the first metal transmission line branch is connected to the first end of the second metal transmission line branch 32, the second end of the second metal transmission line branch 32 is connected to the first end of the third metal transmission line branch 33, and the second end of the third metal transmission line branch 33 is open to serve as the signal output terminal 30 b. The present example is only for illustrating the connection manner of the metal transmission line branches, and does not limit the connection order of the metal transmission line branches.
In a preferred embodiment, the dielectric body 11 of the dielectric resonator 10 is a solid structure, and the surface thereof is covered with a metal coating. The dielectric body 11 is made of a solid dielectric material.
In this embodiment, the position of the cross zero point in the transmission channel is determined by the connection mode of the coupling structure. Fig. 6 and 7 show two embodiments of the coupling structure. For clarity, only one coupling structure is illustrated in fig. 6 and 7, and it is conceivable that, in the example shown in fig. 2 or 5, the first coupling structure, the second coupling structure, or the third coupling structure may be selected as one or more of fig. 6 or 7.
In the embodiment shown in fig. 6, the first end 41 of the coupling structure 40 is embedded in the dielectric body 11, and the first end 41 is not electrically connected to the metal plating layer 12 on the surface of the dielectric resonator 10, so as to form a capacitive transmission zero point on the left side of the transmission channel.
Wherein the coupling structure 40 may be a cylindrical solid metal structure, or may be in the form of a metallized blind hole formed in the dielectric body 11.
The first end 41 of the coupling structure 40 is embedded in the dielectric body 11 and is not electrically connected with the metal plating layer 12 on the surface of the dielectric resonator 10, and thus is not grounded, the second end 42 of the coupling structure 40 is connected (electrically connected or signal connected) with the metal transmission line 30, and negative coupling (electrical coupling) is achieved between the dielectric resonator 10 and the metal transmission line 30 through the coupling structure 40, so that a capacitive transmission zero point is formed on the left side of the transmission channel.
As shown in fig. 6, the dielectric resonator 10 further includes a pilot hole 50, the pilot hole 50 being opened on a surface opposite to a surface on which the coupling structure 40 is located, and the metal plating layer 12 similarly covering the surface of the pilot hole 50. The tuning holes 50 are blind holes for tuning the resonance frequency.
In a preferred embodiment, the tuning holes 50 and the circuit board 20 are located on opposite surfaces of the dielectric resonator 10, respectively. For example, as shown in fig. 2, the debugging hole 50 is opened on the top surface of the dielectric body 11, and the first end 41 of the coupling structure 40 extends into the dielectric body 11 from the bottom surface of the dielectric body 11.
As shown in fig. 6, the metal transmission line 30 is disposed on a side surface of the circuit board 20 facing away from the dielectric resonator 10, the dielectric resonator 10 may be fixed to the circuit board 20 at a bottom surface thereof, and the dielectric material of the circuit board 20 may form a space between the dielectric resonator 10 and the metal transmission line 30. The bottom surface of the dielectric resonant cavity 10 is also covered with a metal plating layer 12, and a gap between the metal plating layer and the circuit board or the metal transmission line can be filled with solder.
In the present embodiment, the second end 42 of the coupling structure 40 penetrates the circuit board 20 from a side surface of the circuit board 20 facing the dielectric resonator 10 to form an electrical connection with the metal transmission line 30.
In a preferred embodiment, a side surface of the circuit board 20 facing the dielectric resonator 10 further includes an insulating layer 21, the insulating layer 21 surrounding the second end 42 to signal-insulate the coupling structure 40 from the circuit board 20.
In the embodiment shown in fig. 7, the first end 41 of the coupling structure 40 is embedded in the dielectric body 11, and the first end 41 is electrically connected to the metal plating layer 12 on the surface of the dielectric resonator 10 to form an inductive transmission zero point on the right side of the transmission channel.
Wherein the coupling structure 40 may be a cylindrical solid metal structure or may be in the form of a metalized via formed in the dielectric body 11.
The first end 41 of the coupling structure 40 is embedded in the dielectric body 11 and is electrically connected to the metal plating 12 on the surface of the dielectric resonator 10 to ground, and the second end 42 of the coupling structure 40 is connected to the metal transmission line 30 (electrically connected or signal connected), so that positive coupling (magnetic coupling) is achieved between the dielectric resonator 10 and the metal transmission line 30 through the coupling structure 40, and an inductive transmission zero point is formed on the right side of the transmission channel.
As shown in fig. 7, the dielectric resonator 10 further includes a pilot hole 50, the pilot hole 50 being opened on a surface opposite to a surface on which the coupling structure 40 is located, and the metal plating layer 12 similarly covering the surface of the pilot hole 50. The tuning holes 50 are blind holes for tuning the resonance frequency.
In a preferred embodiment, the tuning holes 50 and the circuit board 20 are located on opposite surfaces of the dielectric resonator 10, respectively. For example, as shown in fig. 7, the debugging hole 50 is opened on the top surface of the dielectric body 11, and the first end 41 of the coupling structure 40 extends into the dielectric body 11 from the bottom surface of the dielectric body 11.
Thus, the first end 41 of the coupling structure 40 is not electrically connected to the metal plating 12 covering the top surface of the dielectric resonator 10, but is electrically connected to the metal plating covering the side surface of the dielectric resonator 10, and therefore, the first end 41 of the coupling structure 40 may have a bend in the dielectric body 11.
As shown in fig. 7, the metal transmission line 30 is disposed on a side surface of the circuit board 20 facing away from the dielectric resonator 10, the dielectric resonator 10 may be fixed to the circuit board 20 at a bottom surface thereof, and the dielectric material of the circuit board 20 may form a space between the dielectric resonator 10 and the metal transmission line 30. The bottom surface of the dielectric resonant cavity 10 is also covered with a metal plating layer 12, and a gap between the metal plating layer and the circuit board or the metal transmission line can be filled with solder.
In the present embodiment, the circuit board 20 further includes a metal via 22 penetrating through the circuit board 20, and the second end 42 of the coupling structure 40 is electrically connected to a side surface of the circuit board 20 facing the dielectric resonator 10 to be in signal connection with the metal transmission line 30 through the metal via 22.
In a preferred embodiment, a side surface of the circuit board 20 facing the dielectric resonant cavity 10 further comprises an insulating layer 21, the insulating layer 21 surrounding the second end 42 to signal-insulate the coupling structure 40 from the side surface of the circuit board 20 facing the dielectric resonant cavity 10.
In both embodiments of fig. 2 or 5, the second end 42 of the coupling structure 40 may preferably be connected (electrically or signal connected) to a specific location (e.g., a midpoint) of the metal transmission line 30. Among them, the shape, width, extending direction, etc. of the metal transmission line 30 may affect the amplitude and frequency of the transmission zero generated thereby, and thus, the shape of the metal transmission line 30 is not limited to the shapes shown in fig. 2 and 5.
The embodiment of the invention provides a mode of generating multiple resonant frequencies and multiple transmission zeros by adopting a single resonant cavity, so that the frequencies and the positions of the transmission zeros are not influenced by the resonant cavity characteristics of other filters, and each resonant cavity can be independently processed and manufactured, thereby improving the performance of each dielectric filter, reducing the processing precision requirement of each dielectric filter and improving the product performance on the premise of reducing the cost. However, the dielectric filter of the present invention is not limited to the single-cavity solution, and as shown in fig. 8 and fig. 9, another embodiment of the present invention further provides a multimode cascade filter, which is formed by combining the multimode dielectric filters provided by the present invention.
Specifically, the multimode cascade filter includes:
a plurality of multimode dielectric filters as shown in figure 2 or figure 5,
the dielectric resonators 10 of the plurality of multimode dielectric filters are arranged side by side one by one, and adjacent two multimode dielectric filters realize adjacent coupling of the resonance frequency in any one direction of each of the two multimode dielectric filters by directly connecting the signal output terminal 30b of one of the multimode dielectric filters with the signal input terminal 30a of the other multimode dielectric filter.
In the conventional cascade filter, in order to realize the transmission zero, different dielectric filters need to be cross-coupled, and the structure of the cross-coupling is very complicated due to the different directions of the resonant frequencies of the different dielectric filters. In the present embodiment, each multimode dielectric filter forms a transmission zero point by coupling the dielectric resonant cavity with the metal transmission line (microstrip line, etc.) in a manner that the resonant cavity is coupled with the non-resonant cavity, so when any two or more multimode dielectric filters are coupled, only the resonant frequency of any one direction of each multimode dielectric filter needs to be adjacently coupled, and the adjacent coupling can be realized only by directly connecting the input end and the output end of the metal transmission line.
Specifically, in the multimode cascade filter shown in fig. 8, two dual-mode dielectric filters 1 and 2 are included. The signal output terminal 30b of the first dual-mode dielectric filter 1 is an end portion of the second metal transmission line branch 32 thereof, and the signal input terminal 30a of the second dual-mode dielectric filter 2 is an end portion of the first metal transmission line branch 31 of the second dual-mode dielectric filter 2, so that the adjacent coupling of the resonant frequency along the extending direction of the second coupling structure of the first dual-mode dielectric filter 1 and the resonant frequency along the extending direction of the first coupling structure of the second dual-mode dielectric filter 2 can be realized through the connection of the two metal transmission line branches, so that the multi-mode cascade filter shown in fig. 8 has four resonant frequencies.
Similarly, in the multi-mode cascade filter shown in fig. 9, which includes two three- mode dielectric filters 3 and 4, the signal output terminal 30b of the first three-mode dielectric filter 3 is one end of the third metal transmission line branch 33 thereof, and the signal input terminal 30a of the second three-mode dielectric filter 4 is one end of the first metal transmission line branch 31 of the second three-mode dielectric filter 4, through the connection of the two metal transmission line branches, adjacent coupling of the resonance frequency along the extending direction of the third coupling structure of the first three-mode dielectric filter 3 and the resonance frequency along the extending direction of the first coupling structure of the second three-mode dielectric filter 4 can be achieved, so that the multi-mode cascade filter shown in fig. 9 has six resonance frequencies.
In order to adjust the relative positions of the signal input end and the signal output end of the metal transmission line, two adjacent multimode dielectric filters may adopt different arrangement positions, for example, the circuit board 20 where the signal output end 30b of one multimode dielectric filter is located and the circuit board 20 where the signal input end 30a of the other multimode dielectric filter is located may be arranged side by side in the same plane as shown in fig. 8 so that the two dielectric resonators are located on the same side of the circuit board, or may be attached to each other as shown in fig. 9 so that the two dielectric resonators are located on different sides of the circuit board.
Of course, the multimode cascade filter of the present invention is not limited to the manner shown in fig. 8 and 9, for example, the cascade filter may include a cascade connection of more than two dielectric filters; alternatively, the dielectric filter in the multimode cascade filter is not limited to the multimode dielectric filter shown in fig. 2 and 5, but may also include, for example, a single-mode dielectric filter; alternatively, the dielectric filters in the multimode cascade filter are not limited to the multimode dielectric filters of the same type, but may employ, for example, a single mode, a combination of two-mode and three-mode dielectric filters, or the like.
As can be seen from the above technical solutions, in the present embodiment, the directional resonant frequency is realized by the dielectric resonator 10 and a metal transmission line branch through a coupling structure connected therebetween, and the metal transmission line branch and the coupling structure are in one-to-one correspondence. The adjacent coupling of two orthogonal resonant frequencies is converted into the connection of two metal transmission line branches, and the three-dimensional structure is converted into a planar structure, so that the complexity is greatly reduced, therefore, the adjacent coupling structure of the multimode dielectric filter in the embodiment is simple, and the complexity that the coupling structure needs to be arranged in the direction of crossing 45 degrees in the prior art is avoided.
Further, in the multimode dielectric filter of the present embodiment, only one dielectric resonator 10 is included, the coupling mode is not a mode of establishing cross coupling between different resonators, but a mode of coupling a dielectric resonator and a metal transmission line (microstrip line, etc.) in which the resonators and non-resonators are coupled to each other is adopted, wherein two ends of the metal transmission line 30 are open, so as to form a non-closed resonant node, which forms a resonant peak in a transmission channel and a transmission zero on any side of the transmission channel. The mode of mutual coupling of the resonant cavity and the non-resonant cavity enables the dielectric filter to generate a transmission zero point without cross coupling with other dielectric filters, thereby omitting a structure for realizing cross coupling in the prior art and further reducing the complexity of a coupling structure.
In the multimode cascade filter of this embodiment, each multimode dielectric filter forms a transmission zero point by coupling the dielectric resonator with the metal transmission line (microstrip line, etc.) in a manner that the resonator and the non-resonator are coupled with each other, so when any two or more multimode dielectric filters are coupled, it is only necessary to perform adjacent coupling on the resonant frequency of each multimode dielectric filter in any one direction, and the adjacent coupling can be realized only by directly connecting the input end and the output end of the metal transmission line.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions or repetitions of the features without departing from the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A multimode dielectric filter comprising:
a dielectric resonator (10), wherein the dielectric resonator (10) comprises a dielectric body (11) and a metal coating (12) wrapping the outer surface of the dielectric body (11), the dielectric body (11) is in a cuboid shape, and the outer surface of the dielectric body comprises a pair of first surfaces (11a) arranged in parallel, a pair of second surfaces (11b) arranged in parallel and a pair of third surfaces (11c) arranged in parallel, wherein the first surfaces (11a), the second surfaces (11b) and the third surfaces (11c) are orthogonal to each other;
a coupling structure (40), said coupling structure (40) comprising a first coupling structure (40a) and a second coupling structure (40b), said first coupling structure (40a) and second coupling structure (40b) extending from one of said first surface (11a) and one of said second surface (11b) respectively towards the inside of the dielectric body (11);
the metal transmission line (30) is formed by connecting a plurality of metal transmission line branches, two ends of the metal transmission line (30) are respectively a signal input end (30a) and a signal output end (30b), the metal transmission line branches comprise a first metal transmission line branch (31) and a second metal transmission line branch (32) which are connected, the first metal transmission line branch (31) is arranged on the outer side of one first surface (11a) corresponding to the first coupling structure (40a), and the second metal transmission line branch (32) is arranged on the outer side of one second surface (11b) corresponding to the second coupling structure (40 b);
the first coupling structure (40a) is connected with the first metal transmission line branch (31), and the dielectric resonant cavity (10) is coupled with the first metal transmission line branch (31) through the first coupling structure (40a) to form a first resonant frequency in the extending direction of the first coupling structure (40a) and form a first transmission zero point at any side of the transmission channel;
the second coupling structure (40b) is connected to the second metal transmission line branch (32), and the dielectric resonator (10) is coupled to the second metal transmission line branch (32) through the second coupling structure (40b) to form a second resonance frequency in the extending direction of the second coupling structure (40b) and to form a second transmission zero on either side of the transmission channel.
2. The multimode dielectric filter of claim 1,
the coupling structure (40) further comprises a third coupling structure (40c), the third coupling structure (40c) extending from a third surface (11c) towards the inside of the dielectric body (11);
the metal transmission line branches further comprise a third metal transmission line branch (33), the first metal transmission line branch (31), the second metal transmission line branch (32) and the third metal transmission line branch (33) are connected to form a metal transmission line (30), and the third metal transmission line branch (33) is arranged outside one third surface (11c) corresponding to the third coupling structure (40 c);
the third coupling structure (40c) is connected to the third metal transmission line branch (33), and the dielectric resonator (10) is coupled to the third metal transmission line branch (33) through the third coupling structure (40c) to form a third resonant frequency in the extending direction of the third coupling structure (40c) and to form a third transmission zero on either side of the transmission channel.
3. The multimode dielectric filter of claim 1 or 2, wherein each of the metal transmission line branches has two ends corresponding to two side positions of a corresponding one of the outer surfaces.
4. The multimode dielectric filter of claim 1 or 2, further comprising:
the circuit board (20), the outer surface of the corresponding medium body (11) of coupling structure (40) is laminated to circuit board (20), metal transmission line branch sets up in circuit board (20) deviates from one side surface of medium resonant cavity (10).
5. Multimode dielectric filter according to claim 1 or 2, characterized in that the first end (41) of the coupling structure (40) is embedded in the dielectric body (11),
the first end (41) is not electrically connected with the metal coating (12) on the surface of the dielectric resonant cavity (10) to form a capacitive transmission zero point; or
The first end (41) is electrically connected with the metal coating (12) on the surface of the medium resonant cavity (10) to form an inductive transmission zero point.
6. The multimode dielectric filter of claim 4, wherein the second end (42) of said coupling structure (40) extends through said circuit board (20) from a side surface of said circuit board (20) facing said dielectric resonator (10) to electrically connect with said metal transmission line (30).
7. The multimode dielectric filter of claim 4, wherein a side surface of said circuit board (20) facing said dielectric resonator (10) further comprises an insulating layer (21), said insulating layer (21) surrounding said second end (42) to signal insulate said coupling structure (40) from said circuit board (20).
8. The multimode dielectric filter of claim 4, wherein said circuit board (20) further comprises a metal via (22) extending through the circuit board (20), and said second end (42) of said coupling structure (40) is electrically connected to a side surface of the circuit board (20) facing the dielectric resonator (10) for signal connection to said metal transmission line (30) through the metal via (22).
9. A multimode cascaded filter, comprising:
a plurality of multimode dielectric filters as claimed in any one of claims 1 to 8,
the medium resonant cavities (10) of the multimode medium filters are arranged side by side one by one, and adjacent two multimode medium filters realize adjacent coupling of the resonant frequency of any direction of each multimode medium filter in the two multimode medium filters by directly connecting the signal output end (30b) of one multimode medium filter with the signal input end (30a) of the other multimode medium filter.
10. The multimode cascade filter of claim 9, wherein the multimode dielectric filter further comprises:
the circuit board (20), the circuit board (20) is attached to the outer surface of the dielectric body (11) corresponding to the coupling structure (40), and the metal transmission line branches are arranged on the surface of one side, away from the dielectric resonant cavity (10), of the circuit board (20);
in two adjacent multimode dielectric filters, the circuit board (20) where the signal output end (30b) of one multimode dielectric filter is located and the circuit board (20) where the signal input end (30a) of the other multimode dielectric filter is located are arranged in the same plane side by side or attached to each other.
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| CN202011283022.5A CN112542665B (en) | 2020-11-16 | 2020-11-16 | Multimode dielectric filter and multimode cascade filter |
| PCT/KR2021/016639 WO2022103224A1 (en) | 2020-11-16 | 2021-11-15 | Multi-mode dielectric filter and multi-mode cascade filter |
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| CN202011283022.5A CN112542665B (en) | 2020-11-16 | 2020-11-16 | Multimode dielectric filter and multimode cascade filter |
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Cited By (2)
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| WO2022103224A1 (en) * | 2020-11-16 | 2022-05-19 | Samsung Electronics Co., Ltd. | Multi-mode dielectric filter and multi-mode cascade filter |
| WO2023200138A1 (en) * | 2022-04-15 | 2023-10-19 | Samsung Electronics Co., Ltd. | Mixed-mode dielectric waveguide filter |
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Also Published As
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| CN112542665B (en) | 2021-10-29 |
| WO2022103224A1 (en) | 2022-05-19 |
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