CN116683139B - Filter and communication device - Google Patents

Abstract

The invention provides a filter and communication equipment, the filter comprises a shell, a coupling element and four resonant cavities which are sequentially communicated are arranged in the shell, the coupling element and the four resonant cavities form a CQ topological structure, resonant columns are arranged in each resonant cavity, the coupling element penetrates through three resonant cavities, the coupling element is directly and electrically connected or coupled with the resonant columns in the resonant cavity taking one of the three resonant cavities as a connecting node, and the coupling element is respectively coupled with the resonant columns arranged in the other two resonant cavities taking the other three resonant cavities as extending nodes. According to the invention, the coupling element is electrically connected with the three resonant columns in the CQ topological structure of the filter, so that the suppression amplitude corresponding to the two transmission zeros of the filter is adjusted, and the communication performance of the filter is improved.

Description

Filter and communication device

Technical Field

The invention belongs to the technical field of mobile communication, and particularly relates to a filter and communication equipment provided with the filter.

Background

The filter is a frequency selecting device, is an indispensable part of communication equipment, and with the high-speed development of a communication system, the performance of the filter is one of key factors affecting an antenna system. A CQ topology is typically introduced into a conventional filter to achieve the goal of simultaneously creating transmission zeros at both ends of the bandpass of the filter. In the practical application process, the CQ topology structure generally introduces a capacitive coupling structure, for example, a flying rod is disposed between two adjacent resonant cavities, but the disposition of the capacitive coupling structure can make the suppression amplitudes corresponding to the two transmission zeros respectively inconsistent, so that the use requirement of the filter cannot be met.

Disclosure of Invention

The present invention aims to solve at least one of the above problems and provide a filter and a communication device.

The invention is suitable for various purposes, and adopts the following technical scheme:

the invention provides a filter which is suitable for one of the purposes of the invention and comprises a shell, wherein a coupling element and four resonant cavities which are sequentially communicated are arranged in the shell, the coupling element and the four resonant cavities form a CQ topological structure, resonant columns are arranged in each resonant cavity, the coupling element penetrates through three resonant cavities, the coupling element is directly and electrically connected or coupled with the resonant columns in the resonant cavity taking one of the three resonant cavities as a connecting node, and the coupling element is respectively coupled and connected with the resonant columns arranged in the other two resonant cavities taking the three resonant cavities as extending nodes.

Further, the coupling element forms a collar corresponding to one end of the resonant column in the connection node, and the collar is sleeved on the resonant column in the connection node to realize direct electrical connection or coupling connection.

Further, the coupling element forms a fixing portion corresponding to the resonance column of the connection node, and the fixing portion is connected with the resonance column in the connection node.

Further, the resonant column in the connection node is plate-shaped, and the resonant column in the connection node and the coupling element are integrally formed.

Further, the coupling element forms a first coupling piece corresponding to the resonant column in the connection node, and the first coupling piece is arranged at intervals with the resonant column in the connection node.

Further, the coupling elements respectively form second coupling pieces corresponding to the resonance columns in the two extension nodes, and the second coupling pieces are arranged at intervals with the resonance columns in the corresponding extension nodes.

Further, the coupling element comprises a first coupling section and a second coupling section which are connected, the first coupling section extends from the connecting node to one of the extending nodes, and the second coupling section is arranged between the two extending nodes.

Further, the extension length of the second coupling segment is associated with a suppression amplitude corresponding to one of the transmission zeroes of the filter.

Furthermore, the coupling element is provided with a fixing hole or a fixing groove, and the coupling element is inserted into the shell through the fixing shaft passing through the fixing hole or the fixing groove.

Specifically, a supporting block is arranged corresponding to the first coupling section or the second coupling section, and the first coupling section or the second coupling section penetrates through the supporting block.

Specifically, the coupling element is integrally formed.

Further, the second coupling section extends from the resonant column in the first extension node to the resonant column in the second extension node, the resonant column in the second extension node is directly electrically connected or coupled with the fourth coupling piece, and the fourth coupling piece is opposite to the second coupling section.

Further, six or eight resonant cavities are arranged in the shell, and the shell is divided into a first group of resonant cavities comprising four resonant cavities and a second group of resonant cavities comprising two or four resonant cavities, wherein the first group of resonant cavities form the CQ topological structure, the first group of resonant cavities further comprise resonant cavities serving as auxiliary nodes, and resonant columns in any resonant cavity in the second group of resonant cavities are directly electrically connected or coupled with resonant columns in the auxiliary nodes through fifth coupling sheets.

In one embodiment, the four resonant cavities are a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity in sequence along a communication direction, the fourth resonant cavity is used as the connection node, and the first resonant cavity and the second resonant cavity are respectively used as the extension node.

In one embodiment, the four resonant cavities are a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity in sequence along a communication direction, the third resonant cavity is used as the connection node, and the second resonant cavity and the first resonant cavity are respectively used as the extension nodes.

In one embodiment, the four resonant cavities are a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity in sequence along the communication direction, the first resonant cavity is used as the connection node, and the second resonant cavity and the third resonant cavity are respectively used as the extension nodes.

In one embodiment, the four resonant cavities are a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity in sequence along the communication direction, the fourth resonant cavity is used as a connection node, and the third resonant cavity and the second resonant cavity are respectively used as extension nodes.

It is an object of the present invention to provide a communication device comprising a filter as claimed in any one of the previous objects.

The present invention has many advantages over the prior art, including but not limited to:

on one hand, the coupling element and the four resonant cavities of the filter form a CQ topological structure together, and the coupling element is electrically connected with three resonant columns in the CQ topological structure, so that the three resonant columns are mutually coupled to correspondingly change the magnitude of the suppression amplitude corresponding to at least one transmission zero point of the filter, thereby improving the communication performance of the filter.

On the other hand, the coupling element of the filter is electrically connected with the three resonant columns, and compared with the traditional filter which enables the two resonant columns to be coupled through the flying rod, the filter of the invention skillfully improves the electrical relation between the coupling element and the four resonant cavities in the CQ topological structure, so as to change the magnitude of the inhibition amplitude corresponding to the transmission zero point of the filter and improve the communication performance.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram of the internal structure of a filter according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic structural view of the coupling element in fig. 1.

Fig. 3 is a schematic diagram of the internal structure of a filter according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of the coupling element in fig. 3.

Fig. 5 is a schematic diagram of the internal structure of a filter according to another embodiment of the invention.

Fig. 6 is a schematic structural view of the coupling element in fig. 5.

Fig. 7 is a schematic diagram of the internal structure of a filter according to another embodiment of the present invention.

Fig. 8 is a schematic view illustrating the assembly of the coupling element of fig. 7 in a housing.

Fig. 9 is a schematic structural view of the coupling element in fig. 7.

Fig. 10 is a schematic diagram of the internal structure of a filter according to an embodiment of the present invention.

Fig. 11 is a schematic diagram of the internal structure of a filter according to an embodiment of the present invention.

Fig. 12 is a schematic diagram of the internal structure of a filter according to another embodiment of the present invention.

Fig. 13 is a schematic structural view of the coupling element in fig. 12.

Fig. 14 is a schematic view showing an internal structure of a filter according to still another embodiment of the present invention.

Fig. 15 is a schematic structural view of the fourth coupling piece in fig. 14.

Fig. 16 is a schematic diagram showing an internal structure of a filter according to an embodiment of the present invention.

Fig. 17 is a schematic structural view of the fifth coupling tab of fig. 16.

Fig. 18 is a schematic diagram of the internal structure of a filter according to a second embodiment of the present invention.

Fig. 19 is a schematic view showing the internal structure of a filter according to a fourth embodiment of the present invention.

Fig. 20 is a simulation diagram of S parameters of a filter corresponding to two transmission zeros when a second coupling segment of a coupling element of the filter according to an exemplary embodiment of the present invention is of a first length.

Fig. 21 is a simulation diagram of S parameters of a filter corresponding to two transmission zeros when a second coupling segment of a coupling element of the filter according to an exemplary embodiment of the present invention is at a second length.

Fig. 22 is a simulation diagram of S parameters of a filter corresponding to two transmission zeros when a second coupling segment of a coupling element of the filter according to an exemplary embodiment of the present invention is at a third length.

Fig. 23 is a simulation diagram of S parameters of a filter corresponding to two transmission zeros when a second coupling segment of a coupling element of the filter according to an exemplary embodiment of the present invention is of a fourth length.

Fig. 24 is a simulation diagram of S parameters of a filter corresponding to four transmission zeros when the filter according to an exemplary embodiment of the present invention is configured with a fifth coupling chip.

Fig. 25 is a simulation diagram of the S parameters of the filter corresponding to the four transmission zeros when the filter according to the embodiment of the present invention is configured with the fifth coupling chip.

Fig. 26 is a simulation diagram of a filter S parameter corresponding to four transmission zeros when the filter according to another embodiment of the present invention is configured with a fifth coupling chip.

Reference numerals illustrate: a 100-filter; 110-a housing; 120-coupling elements; 121-collar; 122-a fixed connection part; 123-a first coupling tab; 124-a second coupling tab; 125-a third coupling tab; 126-a first coupling section; 127-a second coupling segment; 128-tuning holes; 129-fixing holes; 131-tuning slots; 132-fourth coupling piece; 133-fifth coupling tab; 140-resonant cavity; 141-a first resonant cavity; 1411-a first resonating pillar; 142-a second resonant cavity; 1421-a second resonant column; 143-a third resonant cavity; 1431-a third resonant column; 144-fourth resonant cavity; 1441-fourth resonant columns; 150-connecting the nodes; 151-fifth resonating columns; 1511-mating part; 160-a first extension node; 161-sixth resonant columns; 170-a second extension node; 171-seventh resonating columns; 181-supporting blocks; 182-tuning rods; 183-fixed shaft; 184-screw; 190-auxiliary node; 191-eighth resonating columns; 210-mating node; 211-ninth resonant columns.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that all terms (including 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 unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a filter, in a CQ topological structure of the filter, resonant columns in three resonant cavities are mutually coupled through coupling elements so as to optimize the suppression amplitude corresponding to the transmission zero point of the filter and improve the communication performance.

In an exemplary embodiment of the present invention, in conjunction with fig. 1, the filter 100 includes a housing 110, a coupling element 120 and a plurality of resonant cavities 140 are disposed in the housing 110, four of the resonant cavities 140 are sequentially communicated, and the coupling element 120 is disposed in the four resonant cavities 140, so that the coupling element 120 and the four resonant cavities 140 form a CQ topology structure.

The coupling element 120 is disposed through three resonant cavities 140 of the four resonant cavities 140, and the coupling element 120 is electrically connected to the resonant pillars of the three resonant cavities 140. Wherein one of the three resonators 140 serves as a connection node, hereinafter referred to as a connection node 150; the other two resonators 140 of the three resonators 140 serve as extension nodes, and hereinafter, the two resonators serving as extension nodes are referred to as a first extension node 160 and a second extension node 170, respectively. A fifth resonant column 151 is disposed in the connection node 150, a sixth resonant column 161 is disposed in the first extension node 160, and a seventh resonant column 171 is disposed in the second extension node 170.

The coupling element 120 is directly electrically connected or coupled to the fifth resonant column 151 in the connection node 150, and the coupling element 120 is respectively coupled to the resonant columns in the two extension nodes, specifically, the coupling element 120 is inserted through the connection node 150, the first extension node 160, and the second extension node 170, and the coupling element 120 extends from the fifth resonant column 151 to the sixth resonant column 161, and then extends to the seventh resonant column 171.

Referring to fig. 1 to 6, the coupling element 120 is provided with a collar 121 corresponding to the fifth resonant column 151, the fifth resonant column 151 is sleeved with the collar 121, and the collar 121 is in physical contact with the fifth resonant column 151, so that the collar 121 is electrically connected with the fifth resonant column 151, that is, the coupling element 120 is directly electrically connected with the fifth resonant column 151. Alternatively, the collar 121 is not in direct contact such that collar 121 is coupled to the fifth resonating column 151.

In one embodiment, referring to fig. 7 to 10, the coupling element 120 forms a fixing portion 122 corresponding to the fifth resonant pillar 151, and the fixing portion 122 is connected to the fifth resonant pillar 151, so that the coupling element 120 is directly electrically connected to the fifth resonant pillar 151. In a further embodiment, the side wall of the fifth resonant pillar 151 protrudes outwards to form a mating portion 1511, and the fixing portion 122 is fixedly connected to the mating portion 1511. Preferably, the fastening portion 122 is screwed with the mating portion 1511. For example, screw holes are formed in the fixing portion 122 and the mating portion 1511, respectively, and the fixing portion 122 and the screw holes formed in the mating portion 1511 are connected by screws 184, so that the coupling element 120 is connected to the fifth resonant pillar 151.

In another embodiment, the fixing portion 122 is fixedly connected to the fifth resonant pillar 151, and the coupling element 120 is integrally formed with the fifth resonant pillar 151.

In a further embodiment, in conjunction with fig. 11, the fifth resonant pillar 151 has a plate shape, and the coupling element 120 is integrally formed with the fifth resonant pillar 151 having a plate shape. Preferably, the coupling element 120 and the fifth resonant pillar 151 having a plate shape are integrally formed as a sheet metal.

In other embodiments, each of the resonant columns may be a coaxial resonant column structure or other existing resonant column structures.

In another embodiment, referring to fig. 12 and fig. 13, the coupling element 120 is provided with a first coupling piece 123 corresponding to the fifth resonant pillar 151, the first coupling piece 123 is spaced from the fifth resonant pillar 151, and the first coupling piece 123 is coupled to the fifth resonant pillar 151.

In an exemplary embodiment of the present invention, referring to fig. 1 to 13, the coupling element 120 is provided with a second coupling piece 124 corresponding to the sixth resonant pillar 161, the second coupling piece 124 is spaced apart from the sixth resonant pillar 161, and the second coupling piece 124 is coupled with the sixth resonant pillar 161.

The coupling element 120 is provided with a third coupling piece 125 corresponding to the seventh resonant pillar 171, the third coupling piece 125 is spaced from the seventh resonant pillar 171, and the third coupling piece 125 is coupled to the seventh resonant pillar 171.

The coupling element 120 comprises a first coupling section 126 and a second coupling section 127, the first coupling section 126 being connected to the second coupling section 127. The first coupling section 126 extends from the fifth resonating column 151 to the sixth resonating column 161, and the second coupling section 127 extends from the sixth resonating column 161 to the seventh resonating column 171.

The first end of the first coupling section 126 is directly electrically connected or coupled to the fifth resonant column 151, that is, the collar 121 or the fixing portion 122 or the first coupling piece 123 is disposed on the first end of the first coupling section 126. The second coupling piece 124 is disposed on an end of the first coupling section 126 or a head end of the second coupling section 127, and the third coupling piece 125 is disposed on an end of the third coupling section.

The length of the second coupling section 127 is associated with the rejection amplitude of one of the transmission zeroes of the filter 100. The longer the length of the second coupling section 127, the stronger the suppression amplitude of the corresponding transmission zero. Specifically, the filter 100 has two transmission zeros, which are separately arranged around, and the suppression amplitudes of the two transmission zeros are the same or different.

In this embodiment, the length of the second coupling section 127 corresponds to the suppression amplitude of the transmission zero point on the right side of the filter 100, and the second coupling section 127 is adjusted to adjust the suppression amplitude of the transmission zero point on the right side relative to the suppression amplitude of the transmission zero point on the left side by adjusting the length of the second coupling section, for example, the second coupling element is respectively adjusted to be a first length, a second length, a third length and a fourth length, where the first length is 5mm, the second length is 6mm, the third length is 7mm, the fourth length is 8.8mm, and the first length, the second length, the third length and the fourth length are sequentially increased.

Referring to fig. 1 and 20, fig. 20 is a simulation diagram of a filter S parameter corresponding to two transmission zeros respectively when the second coupling segment is of a first length, and frequency point 3 and frequency point 4 in fig. 20 represent two transmission zeros respectively, that is, frequency points corresponding to triangle 3 and triangle 4 in fig. 20. When the second coupling segment 127 is at the first length, the suppression amplitude corresponding to the right transmission zero is higher than the suppression amplitude corresponding to the left transmission zero.

Referring to fig. 1 and 21, fig. 21 is a simulation diagram of a filter S parameter corresponding to two transmission zeros when the second coupling segment is of the second length, where a frequency point 3 and a frequency point 4 in fig. 21 represent two transmission zeros, i.e. frequency points corresponding to triangle 3 and triangle 4 in fig. 21, respectively. When the second coupling segment 127 is at the second length, the suppression amplitudes corresponding to the right transmission zero and the left transmission zero are similar.

Referring to fig. 1 and 22, fig. 22 is a simulation diagram of a filter S parameter corresponding to two transmission zeros respectively when the second coupling segment is of a third length, and frequency point 3 and frequency point 4 in fig. 22 represent two transmission zeros respectively, that is, frequency points corresponding to triangle 3 and triangle 4 in fig. 22. When the length of the second coupling segment 127 is the third length, the suppression amplitude corresponding to the right transmission zero is lower than the suppression amplitude corresponding to the left transmission zero.

Referring to fig. 1 and 23, fig. 23 is a simulation diagram of a filter S parameter corresponding to two transmission zeros when the second coupling segment 127 is of the fourth length, and the frequency point 3 and the frequency point 4 in fig. 23 represent two transmission zeros, namely, the frequency points corresponding to the triangle 3 and the triangle 4 in fig. 23, respectively. When the length of the second coupling segment 127 is the fourth length, the suppression amplitude corresponding to the right transmission zero is much lower than the suppression amplitude corresponding to the left transmission zero.

It can be seen that by adjusting the length of the second coupling section 127, the suppression amplitude corresponding to the transmission zero of the filter 100 can be adjusted, and the communication performance of the filter 100 can be optimized.

In one embodiment, the suppression amplitudes corresponding to the left and right transmission zeroes of the filter 100 are adjusted synchronously by adjusting the length of the first coupling segment 126.

Referring to fig. 1, a supporting block 181 is further disposed between the connection node 150 and the first extension node 160, the supporting block 181 is embedded in a cavity wall between the connection node 150 and the first extension node 160, a through supporting hole (not shown) is disposed on the supporting block 181, and the first coupling section 126 passes through the supporting hole, so as to support the coupling element 120 through the supporting block 181, so that the coupling element 120 is stably disposed in the filter 100. In one embodiment, a supporting block 181 is also disposed between the first extension node 160 and the second extension node 170, and the second coupling section 127 passes through a supporting hole of the supporting block 181 disposed between the first extension node 160 and the second extension node 170, so as to further stably dispose the coupling element 120 within the filter 100.

In one embodiment, referring to fig. 3 and 4, a tuning rod 182 is further disposed in the housing 110, the coupling element 120 is further provided with a tuning hole 128 and/or a tuning slot 131 corresponding to the tuning rod 182, the tuning rod 182 is inserted into the tuning hole 128 or the tuning slot 131, and the capacitive coupling strength of the coupling element 120 can be adjusted by the tuning rod 182. Specifically, by adjusting the length of the tuning rod 182 to adjust the strength of the coupling element 120, the longer the length of the tuning rod 182, the weaker the capacitive coupling strength of the coupling element 120. Preferably, the coupling element 120 is correspondingly configured with a plurality of tuning rods 182. For example, a tuning hole 128 is provided in each of the first coupling section 126 and the second coupling section 127, or a tuning hole 128 is provided in the first coupling section 126 and a tuning slot 131 is provided in the second coupling section 127. In one embodiment the tuning slots 131 are open slots.

In one embodiment, referring to fig. 5 and 6, a fixing shaft 183 is further disposed in the housing 110, and the fixing shaft 183 is used to fix the coupling element 120 in the housing 110. Specifically, the coupling element 120 is provided with a fixing hole 129 corresponding to the fixing shaft 183, the fixing shaft 183 passes through the fixing hole 129, and one end of the fixing shaft 183 is inserted and fixed with the outer wall of the housing 110, so that the fixing shaft 183 can fix the coupling element 120 in the housing 110, so as to avoid the coupling element 120 from being too long and shaking in the housing 110. The coupling element 120 is provided with one or more fixing holes 129 for fixing the coupling element 120 in the filter 100 by a plurality of fixing shafts 183, preferably bolts or screws.

In one embodiment, referring to fig. 14 and 15, the filter 100 further includes a fourth coupling piece 132, where the fourth coupling piece 132 is directly electrically connected or coupled to the seventh resonant pillar 171 in the second extension node 170, and the fourth coupling piece 132 extends toward the direction where the second coupling segment 127 of the coupling element 120 is located, and the fourth coupling piece 132 is disposed opposite to the second coupling segment 127. By loading the fourth coupling piece 132, the far-end rejection of the filter 100 can be improved, avoiding an excessive increase in the length of the second coupling segment 127 for adjusting the rejection amplitude corresponding to the right transmission zero of the filter 100, so that the second coupling segment 127 can be adjusted in length within an appropriate length interval.

The first end of the fourth coupling piece 132 is directly electrically or coupled to the seventh resonant pillar 171. In one embodiment, in conjunction with fig. 15, the first end of the fourth coupling piece 132 forms a collar 121, and the collar 121 is nested into the seventh resonating pillar 171 and is in physical contact with or coupled to the seventh resonating pillar 171. In another embodiment, the first end of the fourth coupling piece 132 is spaced apart from the seventh resonant pillar 171. Alternatively, the fourth coupling piece 132 is in direct physical contact with the seventh resonant pillar 171, and preferably the fourth coupling piece 132 is integrally formed with the seventh resonant pillar 171.

The second end of the fourth coupling piece 132 extends toward the second coupling section 127 such that the second end of the fourth coupling piece 132 is disposed opposite the end of the second coupling section 127.

In another embodiment, in conjunction with fig. 16 and 17, a fifth coupling piece 133 is further provided in the filter 100. Two sets of resonant cavities 140 are provided in the filter 100, wherein the first set of resonant cavities 140 includes the four resonant cavities 140 described above, and the resonant cavities of the four resonant cavities 140 except for the connection node 150, the first extension node 160 and the second extension node 170 are referred to as an auxiliary node 190, that is, the four resonant cavities 140 are respectively an auxiliary node 190, a connection node 150, a first extension node 160 and a second extension node 170; the second set of resonant cavities 140 includes two or four resonant cavities 140, one resonant cavity 140 in the second set of resonant cavities 140 is a matching node 210, and a ninth resonant column 211 in the matching node 210 is electrically connected to an eighth resonant column 191 in the auxiliary node 190 through a fifth coupling piece 133. In this embodiment, the filter 100 has six resonant cavities 140 or eight resonant cavities 140.

When the filter is provided with the first group of resonant cavities and the second group of resonant cavities and the CQ topological structure of the invention is not loaded, that is, when the filter is a traditional six-cavity or eight-cavity filter, the filter originally has two transmission zeros. When the conventional filter is loaded with the CQ topology structure of the present invention, two transmission zeros may be extended based on the original two transmission zeros, so that the filter 100 has four transmission zeros. Referring to fig. 16, 24, 25 and 26, fig. 24, 25 and 26 are simulation diagrams of the S parameters of the filter corresponding to the four transmission zeros, respectively. As can be seen from fig. 24, 25 and 26, the filter of the present invention has four transmission zeros, and the height of each transmission zero can be balanced and adjusted by configuring the fifth coupling piece 133 in the CQ topology structure, so as to optimize the communication performance of the filter 100.

In this embodiment, referring to fig. 17, collars 121 are formed at two ends of the fifth coupling piece 133, and the two collars 121 of the fifth coupling piece 133 are respectively sleeved in the ninth resonant column 211 and the eighth resonant column 191, and the ninth resonant column 211 and the eighth resonant column 191 are respectively in direct physical contact with or coupled to the corresponding collars 121, so that the ninth resonant column 211 and the eighth resonant column 191 are electrically connected. In another embodiment, two ends of the fifth coupling piece 133 are spaced apart from the ninth and eighth resonant columns 211 and 191, respectively. Alternatively, both ends of the fifth coupling piece 133 are in direct contact with the ninth and eighth resonance posts 211 and 191, respectively.

In an exemplary embodiment of the present invention, referring to fig. 1, four resonant cavities 140 forming a CQ topology together with the coupling element 120 are sequentially a first resonant cavity 141, a second resonant cavity 142, a third resonant cavity 143, and a fourth resonant cavity 144 along a communication direction of the four resonant cavities 140, and the first resonant cavity 141, the second resonant cavity 142, the third resonant cavity 143, and the fourth resonant cavity 144 are sequentially electrically connected.

The coupling element 120 has various connections with the four resonant cavities 140 such that the coupling element 120 and the four resonant cavities 140 form CQ topologies of different structures. Various versions of the CQ topology of coupling element 120 and the four resonators 140 are described in the embodiments below.

In a first embodiment, referring to fig. 1 to 16, the fourth resonant cavity 144 is the connection node 150, the first resonant cavity 141 is the first extension node 160, the second resonant cavity 142 is the second extension node 170, the coupling element 120 extends from the connection node 150 toward the first extension node 160 and then extends toward the second extension node 170, that is, the coupling element 120 extends from the fourth resonant cavity 144 toward the first resonant cavity 141 and then extends toward the second resonant cavity 142, the coupling element 120 is directly electrically connected or coupled with the fourth resonant column 1441 in the fourth resonant cavity 144, and the coupling element 120 is respectively coupled with the first resonant column 1411 in the first resonant cavity 141 and the second resonant column 1421 in the second resonant cavity 142.

In a second embodiment, referring to fig. 18, the third resonant cavity 143 is the connection node 150, the second resonant cavity 142 is the first extension node 160, the first resonant cavity 141 is the second extension node 170, the coupling element 120 extends from the connection node 150 toward the first extension node 160 and then extends toward the second extension node 170, that is, the coupling element 120 extends from the third resonant cavity 143 toward the second resonant cavity 142 and then extends toward the first resonant cavity 141, the coupling element 120 is directly electrically connected or coupled with the third resonant column 1431 in the third resonant cavity 143, and the coupling element 120 is respectively coupled with the second resonant column 1421 in the second resonant cavity 142 and the first resonant column 1411 in the first resonant cavity 141.

In the third embodiment, the first resonant cavity 141 is the connection node 150, the second resonant cavity 142 is the first extension node 160, the third resonant cavity 143 is the second extension node 170, the coupling element 120 extends from the connection node 150 toward the first extension node 160 and then extends toward the second extension node 170, that is, the coupling element 120 extends from the first resonant cavity 141 toward the second resonant cavity 142 and then extends toward the third resonant cavity 143, the coupling element 120 is directly electrically connected or coupled with the first resonant column 1411 in the first resonant cavity 141, and the coupling element 120 is respectively coupled with the second resonant column 1421 in the second resonant cavity 142 and the third resonant column 1431 in the third resonant cavity 143.

In a fourth embodiment, referring to fig. 19, the fourth resonant cavity 144 is the connection node 150, the third resonant cavity 143 is the first extension node 160, the second resonant cavity 142 is the second extension node 170, the coupling element 120 extends from the connection node 150 toward the first extension node 160 and then extends toward the second extension node 170, that is, the coupling element 120 extends from the fourth resonant cavity 144 toward the third resonant cavity 143 and then extends toward the second resonant cavity 142, the coupling element 120 is directly electrically connected or coupled with the fourth resonant column 1441 in the fourth resonant cavity 144, and the coupling element 120 is coupled with the third resonant column 1431 in the third resonant cavity 143 and the second resonant column 1421 in the second resonant cavity 142, respectively.

In the above embodiments, the electrical connection between the coupling element 120 and the first resonator 141, the second resonator 142, the third resonator 143 and the fourth resonator 144 is referred to as the electrical connection between the coupling element 120 and the connection node 150, the first extension node 160 and the second extension node 170, which are not described in detail herein for the sake of brevity.

The invention also provides a communication device, which comprises the filter 100, and the communication device adjusts the rejection amplitude corresponding to the transmission zero points at the two ends of the band pass through the filter 100 so as to improve the balance degree of the communication device.

In one embodiment, the communication device is a diplexer having the filter 100 described above built into it.

In one embodiment, the communication device is a combiner having the filter 100 described above built into it.

In one embodiment, the communication device is an antenna having the filter 100 described above disposed therein.

In summary, according to the invention, the coupling element is electrically connected with the three resonant columns in the CQ topology structure of the filter, so as to adjust the suppression amplitudes corresponding to the two transmission zeros of the filter, and improve the communication performance of the filter.

The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept described above. Such as the above-mentioned features and the features having similar functions (but not limited to) of the invention.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

Claims (16)

1. The filter is characterized by comprising a shell, wherein a coupling element and four resonant cavities which are sequentially communicated are arranged in the shell, the coupling element and the four resonant cavities form a CQ topological structure, resonant columns are arranged in each resonant cavity, the coupling element penetrates through three resonant cavities, and the coupling element is directly and electrically connected or coupled with the resonant columns in the resonant cavity taking one of the three resonant cavities as a connecting node and is respectively coupled with the resonant columns arranged in the other two resonant cavities taking the other three resonant cavities as extending nodes;

the coupling element comprises a first coupling section and a second coupling section which are connected, the first coupling section extends from the connecting node to one of the extending nodes, the second coupling section is arranged between the two extending nodes, and the coupling element is integrally formed.

2. The filter of claim 1, wherein the coupling element forms a collar corresponding to one end of the resonant column in the connection node, and the collar is sleeved on the resonant column in the connection node to realize direct electrical connection or coupling connection.

3. The filter of claim 1, wherein the coupling element forms a securing portion corresponding to the resonating post of the connection node, the securing portion being coupled to the resonating post within the connection node.

4. A filter according to claim 3, wherein the resonant pillars in the connection nodes are plate-shaped, and the resonant pillars in the connection nodes are integrally formed with the coupling element.

5. The filter of claim 1, wherein the coupling element forms a first coupling tab corresponding to the resonant column in the connection node, the first coupling tab being spaced apart from the resonant column in the connection node.

6. A filter according to any one of claims 2 to 5, wherein the coupling elements each form a second coupling tab corresponding to a resonant stub in the two extension nodes, the second coupling tab being spaced from the resonant stub in the corresponding extension node.

7. The filter of claim 1, wherein an extension length of the second coupling segment is associated with a rejection amplitude corresponding to one of the transmission zeroes of the filter.

8. The filter of claim 1, wherein the coupling member is provided with a fixing hole or a fixing groove, and the coupling member is inserted into the housing through the fixing hole or the fixing groove by a fixing shaft.

9. The filter of claim 1, wherein a support block is provided corresponding to the first coupling section or the second coupling section, the first coupling section or the second coupling section penetrating the support block.

10. The filter of claim 1, wherein the second coupling segment extends from a resonant pillar in the first extension node to a resonant pillar in the second extension node, the resonant pillar in the second extension node is directly electrically or coupled to a fourth coupling tab, and the fourth coupling tab is disposed opposite the second coupling segment.

11. The filter of claim 1, wherein six or eight resonators are provided in the housing, and are divided into a first group of four resonators and a second group of two or four resonators, wherein the first group of resonators forms the CQ topology, the first group of resonators further includes resonators as auxiliary nodes, and a resonant column in any one of the second group of resonators is directly electrically or coupled to a resonant column in the auxiliary node through a fifth coupling piece.

12. The filter of claim 1, wherein the four resonators are a first resonator, a second resonator, a third resonator, and a fourth resonator in order along a communication direction, the fourth resonator being the connection node, and the first resonator and the second resonator being the extension nodes, respectively.

13. The filter of claim 1, wherein the four resonators are a first resonator, a second resonator, a third resonator, and a fourth resonator in order along a communication direction, the third resonator being the connection node, and the second resonator and the first resonator being the extension nodes, respectively.

14. The filter of claim 1, wherein the four resonators are a first resonator, a second resonator, a third resonator, and a fourth resonator in order along a communication direction, the first resonator being the connection node, and the second resonator and the third resonator being the extension nodes, respectively.

15. The filter of claim 1, wherein the four resonators are a first resonator, a second resonator, a third resonator, and a fourth resonator in order along a communication direction, the fourth resonator being a connection node, and the third resonator and the second resonator being the extension nodes, respectively.

16. A communication device, characterized in that the communication device comprises a filter according to any of claims 1 to 15.