CN210142707U - Filter and filtering loop structure thereof - Google Patents
Filter and filtering loop structure thereof Download PDFInfo
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- CN210142707U CN210142707U CN201921409079.8U CN201921409079U CN210142707U CN 210142707 U CN210142707 U CN 210142707U CN 201921409079 U CN201921409079 U CN 201921409079U CN 210142707 U CN210142707 U CN 210142707U
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Abstract
The utility model relates to a wave filter and filtering circuit structure thereof through setting up the coupling branch road, can form two coupling return circuits in the major loop. Further, since each of the coupling loops includes the capacitive coupling structure, a phase difference is generated in each of the coupling loops, and a pair of zeros can be generated in each of the coupling loops. Therefore, compared with the traditional filter, the filter adds a pair of zeros, and is in a 6-cavity 4-zero structure. In addition, the cavity arrangement structure of the filter loop does not need to be changed, and only coupling branches are added and a capacitive coupling structure is arranged at a proper position. In addition, the first resonator and the tail resonator in the main loop are arranged on the same side, so that the arrangement of input and output ports is convenient, and the layout space of the filter is saved. Therefore, the filter and the filter loop structure thereof have simpler structures while realizing multiple zero points.
Description
Technical Field
The utility model relates to the field of communication technology, in particular to wave filter and filter circuit structure thereof.
Background
The filter is a frequency-selecting device and is a very critical component in communication equipment. With the rapid development of communication technology, whether a device can achieve low insertion loss becomes a key for restricting the development. The general method is to increase the number of zeros to widen the pass band and improve the rejection, thereby achieving the purpose of reducing the insertion loss. When the zero point is added to the traditional filter, the cavity arrangement structure of the filter is generally required to be redesigned. Therefore, although the multi-zero point can be realized, the structure is complicated.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a filter and a filter circuit structure thereof, which have a simple structure and can realize multiple zeros.
A filtering loop structure comprises six resonators, wherein the six resonators are sequentially arranged along a signal transmission path to form a main loop, a coupling adjusting structure is arranged between a head resonator and a tail resonator, two nonadjacent resonators in the main loop are connected to form a coupling branch and are matched with the main loop to form two coupling loops, and each coupling loop comprises a capacitive coupling structure;
the six resonators are distributed on a first side and a second side opposite to the first side, and the head resonator and the tail resonator are located on the same side.
In one embodiment, the six resonators are respectively a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator which are sequentially arranged, the first resonator and the sixth resonator respectively form the head resonator and the tail resonator, and three resonators are respectively distributed on the first side and the second side.
In one embodiment, the resonator located at the middle position of the first side is connected with the resonator located at the middle position of the second side to form the coupling branch.
In one embodiment, the second resonator, the third resonator and the fourth resonator are sequentially distributed on the first side, the first resonator, the sixth resonator and the fifth resonator are sequentially distributed on the second side, and the third resonator and the sixth resonator are connected to form the coupling branch.
In one embodiment, the resonator includes two stacked dielectric blocks, the second resonator, the third resonator, and the fourth resonator are formed in one of the dielectric blocks, and the first resonator, the sixth resonator, and the fifth resonator are formed in the other of the dielectric blocks.
In one embodiment, the two resonators form the coupling branch by arranging the capacitive coupling structure, and the capacitive coupling structure is shared by the two coupling loops.
In one embodiment, the two resonators are coupled by an inductive coupling structure to form the coupling branches, and the capacitive coupling structure in each coupling loop is disposed between two adjacent resonators except the coupling branches.
In one embodiment, the coupling adjustment structure is a cross-coupling mechanism that can switch between capacitive coupling and inductive coupling between the leading resonator and the trailing resonator.
In one embodiment, the coupling adjustment structure comprises an adjustment groove arranged between the head resonator and the tail resonator, and the distance between one end of the adjustment groove and the side wall of the resonator is adjustable.
A filter comprising a filter loop structure as described in any one of the above preferred embodiments.
The filter and the filtering loop structure thereof can form two coupling loops in the main loop by arranging the coupling branches. Further, since each of the coupling loops includes the capacitive coupling structure, a phase difference is generated in each of the coupling loops, and a pair of zeros can be generated in each of the coupling loops. Therefore, compared with the traditional filter, the filter adds a pair of zeros, and is in a 6-cavity 4-zero structure. In addition, the cavity arrangement structure of the filter loop does not need to be changed, and only coupling branches are added and a capacitive coupling structure is arranged at a proper position. In addition, the first resonator and the tail resonator in the main loop are arranged on the same side, so that the arrangement of input and output ports is convenient, and the layout space of the filter is saved. Therefore, the filter and the filter loop structure thereof have simpler structures while realizing multiple zero points.
Drawings
Fig. 1 is a schematic structural diagram of a filter circuit structure according to an embodiment of the present invention;
FIG. 2 is an equivalent circuit diagram of the filter loop structure shown in FIG. 1;
fig. 3 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 5 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 6 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 7 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 8 is an equivalent circuit diagram of a filter circuit structure according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a filter circuit structure according to another embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present invention provides a filter and filter loop structure 100. Wherein the filter comprises a filter loop structure 100. Also, the filter may be a dielectric filter, or a metal cavity filter.
Referring to fig. 2 to 8, a filter loop structure 100 according to an embodiment of the present invention includes six resonators 110, a coupling adjustment structure 120, and a capacitive coupling structure 130.
Six resonators 110 are sequentially arranged along a signal transmission path to form a main loop, and a coupling adjustment structure 120 is arranged between the head resonator and the tail resonator. The coupling between the head resonator and the tail resonator can be realized through the adjustment of the coupling adjusting structure 120, and signals can be transmitted from the head resonator to the tail resonator in the main loop. The first resonator and the tail resonator can be coupled in a capacitive mode or in an inductive mode. The head resonator and the tail resonator are respectively used for being connected with an input connector and an output connector of the filter.
The six resonators 110 are respectively a first resonator 110a, a second resonator 110b, a third resonator 110c, a fourth resonator 110d, a fifth resonator 110e, and a sixth resonator 110f, which are sequentially arranged. A signal may pass along first resonator 110a, second resonator 110b, third resonator 110c, fourth resonator 110d, fifth resonator 110e, and sixth resonator 110f in sequence. It should be noted that the terms "first," "second," and the like, herein do not denote any particular quantity or order, but rather are used to distinguish one element from another.
Two non-adjacent resonators 100 in the main loop are connected to form a coupling branch 11, and cooperate with the main loop to form two coupling loops, and each coupling loop includes a capacitive coupling structure 130. The capacitive coupling structure 130 may be implemented and adjusted by providing a coupling groove or a coupling hole, and may be any structure capable of adjusting the amount of capacitive coupling. In particular, the two resonators 100 forming the coupling branch 11 may be a capacitive connection or an inductive connection.
As two coupling loops are formed. Further, each of the coupling loops includes the capacitive coupling structure 130, so that a phase difference is generated in each of the coupling loops, thereby generating a pair of zeros in each of the coupling loops. That is, the filter loop result 100 has two pairs of zeros. Compared with the traditional filter, the filter is additionally provided with a pair of zeros which are in a 6-cavity 4-zero structure. Therefore, the insertion loss can be effectively reduced, and the out-of-band rejection can be improved.
The cavity array structure of the six resonators 110 may be the same as the existing filter loop. The six resonators are distributed on the first side and the second side opposite to the first side, and the head resonator and the tail resonator are located on the same side. That is, the leading resonator and the trailing resonator are located on the first side or the second side at the same time. On one hand, the arrangement is convenient for simulation; on the other hand, the corresponding connectors are arranged on the connecting elements such as a circuit board, and the connecting elements can be simultaneously connected with the signal input port (head resonator) and the signal output port (tail resonator) of the main loop, so that the arrangement of the input and output ports is convenient, and the layout space of the filter is saved.
Furthermore, the cavity arrangement structure of the filter loop does not need to be changed, and only the coupling branch is added and the capacitive coupling structure 130 is arranged at a proper position. Therefore, the filter and the filter loop structure 100 thereof have a simpler structure while realizing multiple zeros.
In one embodiment, three resonators 110 are distributed on the first side and the second side respectively. There are various ways to arrange six resonators 110 on both sides, as long as it is ensured that first resonator 110a and sixth resonator 110f are located on the same side. Such as:
as shown in fig. 2, a first resonator 110a, a sixth resonator 110f and a fifth resonator 110e are distributed on the first side; the second side is distributed with a second resonator 110b, a third resonator 110c and a fourth resonator 110 d. As shown in fig. 9, the first side may also be distributed with a second resonator 110b, a first resonator 110a, and a sixth resonator 110 f; and a third resonator 110c, a fourth resonator 110d, and a fifth resonator 110e are distributed on the second side. Moreover, the positions of the first side and the second side can be reversed.
Because the three resonators 110 are respectively distributed on the two sides, the filter loop structure 100 has better symmetry, and is beneficial to improving the filter performance while being beneficial to the layout of the filter.
In one embodiment, the filter loop structure 100 includes two stacked dielectric blocks, the second resonator 110b, the third resonator 110c and the fourth resonator 110d are formed on one of the dielectric blocks, and the first resonator 110a, the sixth resonator 110f and the fifth resonator 110e are formed on the other dielectric block.
During assembly, the three resonators 110 can be formed on the dielectric blocks respectively, and then the two dielectric blocks are overlapped according to the preset intersecting bottoms, so that the assembly is more convenient.
In one embodiment, the resonator 110 located at the middle position of the first side is connected with the resonator 110 located at the middle position of the second side to form a coupling branch.
Because the two resonators 110 at the middle positions of the first side and the second side are arranged oppositely, no flying wire is needed to be arranged when connection is realized, the two resonators 110 can be coupled directly by windowing, arranging a metal rod and the like, and a coupling branch is formed, so that the structure is simplified. Moreover, the two formed coupling loops both include 4 resonators 110, which are highly symmetrical, and are beneficial to further improving the filtering performance.
As shown in fig. 2, in one embodiment, a first resonator 110a, a sixth resonator 110f and a fifth resonator 110e are distributed on the first side, and a second resonator 110b, a third resonator 110c and a fourth resonator 110d are distributed on the second side. At this time, the third resonator 110c and the sixth resonator 110f are connected to form a coupling branch. The first coupling loop 12 includes a first resonator 110a, a second resonator 110b, a third resonator 110c and a sixth resonator 110 f; the second coupling loop 13 includes a third resonator 110c, a fourth resonator 110d, a fifth resonator 110e, and a sixth resonator 110 f.
In another embodiment, as shown in fig. 9, the first side is distributed with the second resonator 110b, the first resonator 110a and the sixth resonator 110f, and the second side is distributed with the third resonator 110c, the fourth resonator 110d and the fifth resonator 110 e. At this time, the first resonator 110a and the fourth resonator 110d are connected to form a coupling branch. The first coupling loop 12 includes a first resonator 110a, a second resonator 110b, a third resonator 110c and a fourth resonator 110 d; the second coupling loop 13 includes a fourth resonator 110d, a fifth resonator 110e, a sixth resonator 110f, and a first resonator 110 a.
The capacitive coupling structures 130 may be shared between the two coupling loops, or the capacitive coupling structures 130 may be separately disposed. As shown in fig. 1 and fig. 2, in one embodiment, a capacitive coupling structure 130 is disposed between two resonators 110 to form a coupling branch, and the capacitive coupling structure 130 is shared by two coupling loops.
At this time, the two resonators 110 constituting the coupling branch are capacitively coupled, and the leading resonator and the trailing resonator are inductively coupled. Since both coupling loops may share the capacitive coupling structure 130. Therefore, only one capacitive coupling structure 130 is required to be disposed in the filter loop structure 100, which is beneficial to simplifying the structure.
In addition, each coupling loop can be provided with a capacitive coupling structure independently. In other embodiments, as shown in fig. 3 to 8, two resonators 110 are coupled by arranging an inductive coupling structure to form a coupling branch, and the capacitive coupling structure 130 in each coupling loop is arranged between two adjacent resonators 110 except the coupling branch.
In one embodiment, the coupling adjustment structure 120 is a cross-coupling mechanism that can switch between capacitive coupling and inductive coupling between the leading and trailing resonators.
Specifically, when the cross-coupling structure is capacitively coupled, the cross-coupling structure can be used as the capacitive coupling structure 130 in the coupling loop. As shown in fig. 7, the coupling adjustment structure 120 serves as a capacitive coupling structure 130. Therefore, the coupling loop can be adjusted only by adjusting the capacitive coupling of the cross-coupling structure, and the adjustment of the coupling loop is simpler and more convenient compared with a mode of adjusting by using other capacitive coupling structures 130 in the coupling loop after adjusting the inductive coupling between the head resonator and the tail resonator by using the coupling adjusting structure 120.
Further, in one embodiment, the coupling adjustment structure 120 includes an adjustment groove 121 disposed between the leading resonator and the trailing resonator, and an interval between one end of the adjustment groove 121 and a sidewall of the resonator 110 is adjustable. Therefore, the coupling amount between the two resonators at the head and the tail can be adjusted by flexibly adjusting the distance between one end of the adjustment groove 121 and the sidewall of the resonator 110, i.e., "L" shown in fig. 1.
The filter and the filtering loop structure 100 thereof can form two coupling loops in the main loop by arranging the coupling branches. Further, since the capacitive coupling structure 130 is included in each of the coupling loops, a phase difference is generated in each of the coupling loops, so that a pair of zeros can be generated in each of the coupling loops. Therefore, compared with the traditional filter, the filter adds a pair of zeros, and is in a 6-cavity 4-zero structure. Furthermore, the cavity arrangement of the filter loop 100 does not need to be changed, and only the coupling branches need to be added and the capacitive coupling structure 130 needs to be arranged at a proper position. In addition, the first resonator and the tail resonator in the main loop are arranged on the same side, so that the arrangement of input and output ports is convenient, and the layout space of the filter is saved. Therefore, the filter and the filter loop structure thereof have simpler structures while realizing multiple zero points.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A filtering loop structure is characterized by comprising six resonators, wherein the six resonators are sequentially arranged along a signal transmission path to form a main loop, a coupling adjusting structure is arranged between a head resonator and a tail resonator, two nonadjacent resonators in the main loop are connected to form a coupling branch and are matched with the main loop to form two coupling loops, and each coupling loop comprises a capacitive coupling structure;
the six resonators are distributed on a first side and a second side opposite to the first side, and the head resonator and the tail resonator are located on the same side.
2. The filter loop structure of claim 1, wherein the six resonators are respectively a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator, which are sequentially arranged, the first resonator and the sixth resonator respectively form the head resonator and the tail resonator, and three resonators are respectively distributed on the first side and the second side.
3. The filter loop structure of claim 2, wherein the resonator located at the middle of the first side is connected to the resonator located at the middle of the second side to form the coupling branch.
4. The filter loop structure of claim 3, wherein the second resonator, the third resonator and the fourth resonator are sequentially distributed on the first side, the first resonator, the sixth resonator and the fifth resonator are sequentially distributed on the second side, and the third resonator and the sixth resonator are connected to form the coupling branch.
5. The filter loop structure of claim 3, wherein the filter loop structure comprises two laminated dielectric blocks, the second resonator, the third resonator and the fourth resonator are formed on one of the dielectric blocks, and the first resonator, the sixth resonator and the fifth resonator are formed on the other dielectric block.
6. The filter loop structure of any one of claims 1 to 5, wherein the capacitive coupling structure is disposed between two resonators to form the coupling branch, and the capacitive coupling structure is shared by the two coupling loops.
7. The filter loop structure of any one of claims 1 to 5, wherein an inductive coupling structure is disposed between two resonators to form the coupling branches, and the capacitive coupling structure in each coupling loop is disposed between two adjacent resonators except the coupling branches.
8. The filter loop structure of claim 1, wherein the coupling adjustment structure is a cross-coupling mechanism that switches between capacitive coupling and inductive coupling between the leading resonator and the trailing resonator.
9. The filter loop structure of claim 8, wherein the coupling adjustment structure comprises an adjustment slot disposed between the leading resonator and the trailing resonator, and a distance between one end of the adjustment slot and a sidewall of the resonator is adjustable.
10. A filter comprising a filter loop structure as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110429364A (en) * | 2019-08-27 | 2019-11-08 | 京信通信技术(广州)有限公司 | Filter and its filter circuit structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110429364A (en) * | 2019-08-27 | 2019-11-08 | 京信通信技术(广州)有限公司 | Filter and its filter circuit structure |
| WO2021035805A1 (en) * | 2019-08-27 | 2021-03-04 | 京信通信技术(广州)有限公司 | Filter and filter loop structure thereof |
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