Dual-mode filter and communication equipment

Abstract

The invention provides a dual-mode filter and communication equipment, the dual-mode filter comprises a shell, the shell is internally provided with a first resonant cavity and a second resonant cavity, the first resonant cavity is internally provided with a first resonator, the first resonator comprises a first metal resonant column and a first medium resonant column which are stacked up and down, and the second resonant cavity is internally provided with a second resonator; a second resonator is arranged in the second resonant cavity, the second resonator comprises a second metal resonant column and a second dielectric resonant column which are stacked up and down, and the first resonator and the second resonator are mutually coupled through a CQ coupling structure. Compared with a traditional filter, coupling between the resonant cavities is generally located at the horizontal plane position, coupling between the resonant cavities is changed into coupling in the vertical direction from the horizontal position, the row cavity space is greatly saved, a transmission zero point can be generated through linear layout, cross coupling is adjusted through a CQ coupling structure, and the coupling efficiency is improved. Therefore, the effects of high suppression and low insertion loss are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to a dual-mode filter and a communication device equipped with the dual-mode filter. Background Art

[0002] As the core frequency selection device in the communication system, the main function of the filter is to screen and transmit the specific frequency components required in the signal, while effectively suppressing the interference of other unnecessary frequencies. With the continuous advancement of communication technology and the increasing diversification of communication needs, the performance requirements of communication systems for filters are also continuously improving. Although traditional filters can meet basic communication needs to a certain extent, they have gradually exposed limitations in terms of loss, out-of-band suppression, volume, weight, etc., and it is difficult to meet the urgent needs of modern communication systems for high-performance, miniaturized, and low-cost filters.

[0003] In order to meet these ever-increasing demands, dual-mode filters came into being. Compared with traditional filters, dual-mode filters have achieved significant performance improvements, especially in terms of loss and out-of-band suppression characteristics. This advantage makes dual-mode filters show great application potential and market prospects in the field of communications. However, despite the breakthroughs in performance, the main problems currently faced by dual-mode filters are limitations in structural design and volume.

[0004] The mainstream dual-mode filters on the current market are mostly dielectric dual-mode filters. Although this type of filter has excellent performance, it has brought many inconveniences to practical applications due to its complex structure and relatively large size. First, the complex structure and large size increase the difficulty of debugging the filter, making quality control and performance optimization in the production process more difficult. Secondly, the large size not only limits the application scenarios of the filter, but also increases the production cost to a certain extent, thus affecting the market competitiveness of the dual-mode filter. These problems not only hinder the further promotion and application of dual-mode filters, but also limit the potential of communication systems in terms of performance improvement and cost reduction. Summary of the invention

[0005] The primary purpose of the present invention is to solve at least one of the above problems and provide a dual-mode filter and a communication device.

[0006] In order to meet the various objectives of the present invention, the present invention adopts the following technical solutions: A dual-mode filter is provided to meet one of the purposes of the present invention, including a shell, a first resonant cavity and a second resonant cavity are arranged in the shell, a first resonator is arranged in the first resonant cavity, the first resonator includes a first metal resonant column and a first dielectric resonant column stacked up and down, a second resonator is arranged in the second resonant cavity, the second resonator includes a second metal resonant column and a second dielectric resonant column stacked up and down, and the first resonator and the second resonator are mutually coupled through a CQ coupling structure.

[0007] Furthermore, the CQ coupling structure enables: the first metal resonance column and the second dielectric resonance column to be coupled to each other, the second metal resonance column and the first dielectric resonance column to be coupled to each other, and the first dielectric resonance column and the second dielectric resonance column to be coupled to each other.

[0008] Furthermore, the CQ coupling structure includes a first coupling plate vertically disposed in the first resonant cavity, a second coupling plate vertically disposed in the second resonant cavity, and a connecting plate connecting the first coupling plate and the second coupling plate.

[0009] In one embodiment, the first coupling plate is provided with a first extending branch, and the first extending branch is extended toward the first resonator; the second coupling plate is provided with a second extending branch, and the second extending branch is extended toward the second resonator.

[0010] In one embodiment, the CQ coupling structure is integrally formed.

[0011] In one embodiment, the first dielectric resonator is provided with an arc notch, and the second dielectric resonator is provided with an arc notch.

[0012] In one embodiment, the first resonant cavity and the second resonant cavity form a CQ topology structure.

[0013] In one embodiment, a third resonant cavity and a fourth resonant cavity are further provided in the shell, the third resonant cavity is arranged adjacent to the first resonant cavity, the fourth resonant cavity is arranged adjacent to the second resonant cavity, a first coupling structure is respectively provided between the first resonant cavity and the third resonant cavity, and between the second resonant cavity and the fourth resonant cavity, and the two first coupling structures are respectively protruded toward the first resonant cavity and the second resonant cavity.

[0014] In one embodiment, a second coupling structure is respectively disposed on the top surface of the first dielectric resonant column and the top surface of the second dielectric resonant column, and the second coupling structure includes a pair of coupling blocks.

[0015] In one embodiment, the size of the angle formed between the pair of coupling blocks is negatively correlated with the coupling strength between the first resonator and the second resonator.

[0016] In one embodiment, a height of the coupling block in a vertical direction of the first metal resonant column is positively correlated with a coupling strength between the first resonator and the second resonator.

[0017] In one embodiment, a flying rod is further provided between the first resonant cavity and the second resonant cavity, and the first metal resonant column and the second metal resonant column are coupled via the flying rod.

[0018] A communication device is provided to meet one of the purposes of the present invention, comprising a dual-mode filter as described in any one of the preceding purposes.

[0019] Compared with the prior art, the present invention has many advantages, including but not limited to: (1) In traditional filters, the coupling between resonant cavities is usually located in the horizontal plane, which requires the filter to occupy a large space in the horizontal direction. However, the dual-mode filter of the present invention introduces the first resonator and the second resonator to change the coupling between the resonant cavities from the horizontal direction to the vertical direction. This greatly saves the cavity row space and significantly reduces the space requirement of the dual-mode filter in the horizontal direction, making the dual-mode filter structure more compact and more suitable for occasions with strict space requirements, such as mobile communication equipment, radar systems, etc.

[0020] (2) The existence of the transmission zero point is of great significance for improving the frequency selectivity of the dual-mode filter and suppressing out-of-band interference. Traditional filters often require complex layout and tuning to achieve the generation of transmission zero points, while the dual-mode filter of the present invention can achieve this goal only through a linear layout. This not only simplifies the structure of the dual-mode filter, but also facilitates production and manufacturing.

[0021] (3) The dual-mode filter of the present invention adjusts the cross-coupling between the resonant cavities through the CQ coupling structure. This coupling structure can achieve high suppression and low insertion loss by controlling the energy transmission path and loss inside the dual-mode filter. High suppression means that the dual-mode filter can better suppress out-of-band signals to prevent them from interfering with the normal operation of the system; while low insertion loss ensures that the dual-mode filter does not cause excessive energy loss when transmitting useful signals, thereby improving the overall performance of the system.

[0022] (4) Due to the use of the first resonator, the second resonator and the CQ coupling structure, the dual-mode filter has higher flexibility and adjustability. The size, shape and coupling structure parameters of the dual-mode resonator can be adjusted according to actual needs to optimize the performance of the dual-mode filter. This flexibility enables the dual-mode filter to better meet the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 Schematic diagram of the structure of a dual-mode filter (cover plate not shown) according to a typical embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the assembly between the coupling component and two dual-mode resonators of the dual-mode filter according to the first embodiment of the present invention.

[0025] Figure 3 FIG. 1 is a schematic diagram of the assembly between a coupling component and two dual-mode resonators of a dual-mode filter according to a second embodiment of the present invention.

[0026] Figure 4 FIG. 4 is a schematic diagram of the assembly between a coupling component and two dual-mode resonators of a dual-mode filter according to a third embodiment of the present invention.

[0027] Figure 5 Schematic diagram of the topological structure of a dual-mode filter according to a typical embodiment of the present invention.

[0028] Figure 6 1 and 2 are S parameter simulation diagrams corresponding to the two transmission zero points of the dual-mode filter of the first embodiment of the present invention.

[0029] Figure 7 1 and 2 are S parameter simulation diagrams corresponding to two transmission zero points of the dual-mode filter of the second embodiment of the present invention.

[0030] Figure 8 1 and 2 are S parameter simulation diagrams corresponding to two transmission zero points of the dual-mode filter of the third embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be interpreted as limiting the present invention.

[0032] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0033] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0034] The present invention provides a dual-mode filter, wherein the dual-mode resonator of the dual-mode filter comprises a metal resonance column and a dielectric resonance column stacked up and down, so as to improve the space utilization rate of the dual-mode filter, facilitate the miniaturization of the dual-mode filter, and facilitate the miniaturization of the communication equipment on which the dual-mode filter is installed.

[0035] In an exemplary embodiment of the present invention, Figure 1 The dual-mode filter 100 includes a metal shell 110 and a coupling component disposed in the metal shell 110. The metal shell 110 is provided with a plurality of resonant cavities 111, for example, 4 resonant cavities, 5 resonant cavities, 6 resonant cavities, 8 resonant cavities, etc. In this embodiment, the invention is described by taking the metal shell 110 as having 4 resonant cavities 111 as an example, but this should not be construed as limiting the invention.

[0036] The four resonant cavities 111 are sequentially arranged along the length direction of the metal shell 110, and the four resonant cavities 111 are sequentially connected. The two resonant cavities 111 in the middle of the four resonant cavities 111 are dual-mode resonant cavities 120, and the two resonant cavities on both sides of the two dual-mode resonant cavities 120 are metal resonant cavities 130.

[0037] The dual-mode resonant cavity 120 is provided with a dual-mode resonator 122. Figure 2 The dual-mode resonator 122 includes a metal resonant column 123 and a dielectric resonant column 124, and the metal resonant column 123 and the dielectric resonant column 124 are stacked up and down along the vertical direction of the metal resonant column 123, so that the metal resonant column 123 and the dielectric resonant column 124 can be arranged simultaneously in the dual-mode resonant cavity 120 to improve the space utilization of the dual-mode resonant cavity 120, which is convenient for miniaturization of the dual-mode filter 100.

[0038] Specifically, along the vertical direction, the dielectric resonant column 124 includes a bottom surface and a top surface 1241, and the bottom surface and the top surface 1241 are both metallized. It can be understood that a metal layer is provided on the bottom surface and the top surface 1241. In this embodiment, it is recommended that the bottom surface and the top surface 1241 are both formed with a metal layer by electroplating, or that a metal sheet is covered on the bottom surface and the top surface 1241 to form a metal layer, but this should not be understood as limiting the present invention.

[0039] Combination Figure 1 and Figure 2 The bottom surface of the dielectric resonant column 124 is electrically connected to the cavity bottom wall 121 of the dual-mode resonant cavity 120 to achieve grounding. In this embodiment, the bottom surface is welded to the cavity bottom wall 121 so that the dielectric resonant column 124 is electrically connected to the dual-mode resonant cavity 120 as an example to describe the present invention.

[0040] Combination Figure 2 , along the vertical direction, the bottom end of the metal resonance column 123 is arranged on the top surface 1241 of the dielectric resonance column 124, and the bottom end of the metal resonance column 123 is electrically connected to the top surface 1241. In this embodiment, the present invention is described by taking the bottom end of the metal resonance column 123 and the top surface 1241 being welded to make the metal resonance column 123 and the dielectric resonance column 124 electrically connected as an example.

[0041] In one embodiment, an arc notch 1242 is provided on the outer surface of the dielectric resonant column 124, and the arc notch 1242 is formed by being recessed from the outer surface of the dielectric resonant column 124 toward the central axis direction of the dielectric resonant column 124. In this embodiment, the dielectric resonant column 124 has two modes, one of which works selectively, and the arc notch 1242 is used to push the mode of the dielectric resonant column 124 in a non-working state to a high frequency to avoid affecting the working performance of the mode in a working state.

[0042] In a further embodiment, the opening of the arc notch 1242 faces the side wall 112 of the metal shell 110 to avoid coupling between the non-working modes of the two dielectric resonant columns 124 , thereby affecting the electrical performance of the dual-mode filter 100 .

[0043] In an exemplary embodiment of the present invention, Figure 2 , Figure 3 as well as Figure 4 The coupling component includes a CQ coupling structure 160, and the CQ coupling structure 160 is arranged between the two dual-mode resonant cavities 120, so that the dual-mode resonators 122 in the two dual-mode resonant cavities 120 are coupled to each other to adjust the coupling strength between the two dual-mode resonators 122 and adjust the working performance of the dual-mode filter 100.

[0044] Specifically, combined Figure 1 A metal partition (the metal partition is referred to as a first metal partition 113) is formed between the two dual-mode resonant cavities 120. The two dual-mode resonant cavities 120 are separated by the first metal partition 113. A first connecting hole (not shown) is opened on the first metal partition 113. The first connecting hole is arranged near the cavity bottom wall 121 of the dual-mode resonant cavity 120.

[0045] Combination Figure 2 , Figure 3 as well as Figure 4 The CQ coupling structure 160 includes a connecting piece 161 and a pair of coupling pieces 162, and the pair of coupling pieces 162 are respectively arranged in the two dual-mode resonant cavities 120, wherein the bottom end 1621 of the coupling piece 162 in the vertical direction is welded to the cavity bottom wall 121 of the dual-mode resonant cavity 120 where it is located, so as to achieve electrical connection with the dual-mode resonant cavity 120. The connecting piece 161 passes through the first connecting hole, and the two ends of the connecting piece 161 are respectively connected to the pair of coupling pieces 162, so that the pair of coupling pieces 162 are electrically connected through the connecting piece 161. In this embodiment, it is recommended that the CQ coupling structure 160 is an integrally formed setting, but it is not understood as a limitation to the present invention.

[0046] The pair of coupling plates 162 are respectively coupled to the dual-mode resonators 122 in the dual-mode resonant cavities 120 where they are located, so that the two dual-mode resonators 122 are coupled, that is, the two dual-mode resonators 122 are coupled via the CQ coupling structure 160 .

[0047] For the convenience of description, the pair of dual-mode resonant cavities 120 are respectively referred to as a first resonant cavity 140 and a second resonant cavity 150; the dual-mode resonator in the first resonant cavity 140 is a first resonator 141, and the first resonator 141 includes a first metal resonant column 142 and a first dielectric resonant column 143; the dual-mode resonator in the second resonant cavity 150 is a second resonator 151, and the second resonator 151 includes a second metal resonant column 152 and a second dielectric resonant column 153; the pair of coupling plates 162 are respectively a first coupling plate 163 and a second coupling plate 164.

[0048] The first coupling plate 163 is disposed in the first resonant cavity 140, and the first coupling plate 163 can be coupled with the first metal resonant column 142 and the first dielectric resonant column 143 in the first resonant cavity 140 respectively; the second coupling plate 164 is disposed in the second resonant cavity 150, and the second coupling plate 164 can be coupled with the second metal resonant column 152 and the second dielectric resonant column 153 in the second resonant cavity 150 respectively.

[0049] Understandable, combined Figures 1 to 5 Under the action of the CQ coupling structure 160, the first metal resonant column 142 can be coupled with the second dielectric resonant column 153, the first dielectric resonant column 143 can be coupled with the second dielectric resonant column 153, and the first dielectric resonant column 143 can be coupled with the second metal resonant column 152. Through the CQ coupling structure 160, the coupling strength among the first metal resonant column 142, the first dielectric resonant column 143, the second metal resonant column 152 and the second dielectric resonant column 153 can be adjusted to adjust the transmission zero point of the dual-mode filter 100 and improve the working performance of the dual-mode filter 100. In some embodiments, the CQ coupling structure also couples the first metal resonant column 142 with the second metal resonant column 152.

[0050] In the first embodiment, the combination Figure 2 , the two ends of the connecting piece 161 are respectively connected to the top of the first coupling piece 163 and the top of the second coupling piece 164. In this embodiment, it is recommended that the first coupling piece 163, the connecting piece 161 and the second coupling piece 164 are connected to form an n-shaped structure, but this should not be understood as a limitation of the present invention.

[0051] In this embodiment, see Figure 6 , Figure 6The S parameter simulation diagrams corresponding to the two transmission zero points of the dual-mode filter of the first embodiment of the present invention are respectively shown. The CQ coupling structure 160 increases the electrical coupling between the first dielectric resonant column 143 and the second metal resonant column 152, and also increases the electrical coupling between the first metal resonant column 142 and the second dielectric resonant column 153, so that the transmission zero point of the dual-mode filter 100 becomes high on the left and low on the right, and the working performance of the dual-mode filter 100 is adjusted accordingly.

[0052] In the second embodiment, the combination Figure 3 , based on the CQ coupling structure 160 of the first embodiment, the top 1631 of the first coupling piece 163 is protruded relative to the connecting piece 161 along the vertical direction, and the top 1641 of the second coupling piece 164 is protruded relative to the connecting piece 161 along the vertical direction. In this embodiment, it is recommended that the first coupling piece 163, the connecting piece 161 and the second coupling piece 164 are connected to form an H-shaped structure, but this should not be construed as a limitation to the present invention.

[0053] In this embodiment, see Figure 7 , Figure 7 The S parameter simulation diagrams corresponding to the two transmission zero points of the dual-mode filter of the second embodiment of the present invention are respectively shown. The CQ coupling structure 160 makes the coupling between the first dielectric resonant column 143 and the second metal resonant column 152 zero, and makes the coupling between the first metal resonant column 142 and the second dielectric resonant column 153 zero, so that the dual-mode filter 100 obtains transmission zero point balance, that is, the left and right zero points are equal, and the working performance of the dual-mode filter 100 is adjusted accordingly.

[0054] In the third embodiment, combined with Figure 4 On the basis of the CQ coupling structure 160 of the second embodiment, the coupling piece 162 further includes an extension branch 1622, the extension branch 1622 is connected to the coupling piece 162, and the extension branch 1622 is extended toward the metal resonance column 123 in the dual-mode resonant cavity 120. In this embodiment, it is recommended that the extension branch 1622 is arranged horizontally relative to the coupling piece 162. In this embodiment, it is recommended that the extension branch 1622 is connected to the coupling piece 162 to form a "┓" and "┏" or "┤", "├" shaped structure, but it should not be understood as a limitation to the present invention.

[0055] Specifically, the first coupling plate 163 is provided with an extension branch (the extension branch is called the first extension branch 1632), and the first extension branch 1632 is extended from the first coupling plate 163 toward the first metal resonant column 142 in the first resonant cavity 140; the second coupling plate 164 is provided with an extension branch (the extension branch is called the second extension branch 1642), and the second extension branch 1642 is extended from the second coupling plate 164 toward the second metal resonant column 152 in the second resonant cavity 150.

[0056] In this embodiment, see Figure 8 , Figure 8 The S parameter simulation diagrams corresponding to the two transmission zero points of the dual-mode filter of the third embodiment of the present invention respectively, the CQ coupling structure 160 increases the magnetic coupling between the first dielectric resonant column 143 and the second metal resonant column 152, and also enhances the magnetic coupling between the first metal resonant column 142 and the second dielectric resonant column 153, so that the transmission zero point of the dual-mode filter 100 becomes low on the left and high on the right, and the working performance of the dual-mode filter 100 is adjusted accordingly.

[0057] Therefore, in combination with the first embodiment, the second embodiment and the third embodiment, it can be known that the coupling size between the two dual-mode resonators 122 can be adjusted by changing the structure of the CQ coupling structure 160, thereby adjusting the left and right zero points of the dual-mode filter 100, and further adjusting the working performance of the dual-mode filter 100.

[0058] In an exemplary embodiment of the present invention, Figure 5 The two dual-mode resonant cavities 120 together form a CQ topology structure, so as to adjust the left and right transmission zero points of the dual-mode filter 100 and optimize the communication performance.

[0059] Combination Figure 1 Since the two metal resonant cavities 130 are disposed on both sides of the two dual-mode resonant cavities 120 , it can be understood that each dual-mode resonant cavity 120 is disposed adjacent to a corresponding metal resonant cavity 130 , and a metal resonant column 131 is also disposed in the metal resonant cavity 130 .

[0060] Specifically, the two metal resonant cavities 130 are respectively a third resonant cavity 133 and a fourth resonant cavity 134 . The third resonant cavity 133 is disposed adjacent to the first resonant cavity 140 , and the fourth resonant cavity 134 is disposed adjacent to the second resonant cavity 150 .

[0061] The coupling component includes a first coupling structure 170 , which is disposed between the adjacent dual-mode resonant cavity 120 and the metal resonant cavity 130 to adjust the coupling strength between the two dual-mode resonators 122 , thereby correspondingly adjusting the working performance of the dual-mode filter 100 .

[0062] In this embodiment, a metal partition (the metal partition is referred to as a second metal partition 114) is formed between the adjacent dual-mode resonant cavity 120 and the metal resonant cavity 130, a second connecting hole (not shown) is opened on the second metal partition 114, the first coupling structure 170 is arranged in the second connecting hole, and the first coupling structure 170 is protruded toward the dual-mode resonant cavity 120. In this embodiment, it is recommended that the first coupling structure is a block structure, but it should not be understood as a limitation to the present invention.

[0063] Combination Figure 2 and Figure 3 The coupling assembly further includes a second coupling structure 180, which includes a pair of coupling blocks 181. The pair of coupling blocks 181 are arranged on the top surface 1241 of the dielectric resonator in the dual-mode resonant cavity 120, and are located outside the top surface 1241. The pair of coupling blocks 181 are located on the side of the top surface 1241 close to the adjacent metal resonant cavity 130. The second coupling structure 180 is used to adjust the coupling strength between the two dual-mode resonators 122, thereby correspondingly adjusting the working performance of the dual-mode filter 100. In this embodiment, it is recommended that the coupling block 181 is a rectangular block structure, but this should not be understood as a limitation to the present invention.

[0064] In one embodiment, the pair of coupling blocks 181 are disposed on both sides of the longitudinal center axis of the metal shell 110, and the size of the angle formed by the pair of coupling blocks 181 is negatively correlated with the coupling strength between the two dual-mode resonators 122, that is, the smaller the angle formed by the two coupling blocks 181, the stronger the coupling strength between the two dual-mode resonators 122; otherwise, the smaller the angle formed by the two coupling blocks 181. Therefore, the present invention can adjust the coupling strength between the two dual-mode resonators 122 by adjusting the size of the angle formed by the pair of coupling blocks 181, thereby adjusting the working performance of the dual-mode filter 100.

[0065] In one embodiment, the coupling strength between the two dual-mode resonators 122 can also be adjusted by adjusting the height of the coupling block 181 in the vertical direction. Specifically, the height of the coupling block 181 is positively correlated with the coupling strength between the two dual-mode resonators 122, that is, the greater the height of the coupling block 181, the stronger the coupling strength between the two dual-mode resonators 122; conversely, the smaller the coupling strength between the two dual-mode resonators 122. Therefore, the present invention can adjust the coupling strength between the two dual-mode resonators 122 by adjusting the height of the coupling block 181, thereby adjusting the working performance of the dual-mode filter 100.

[0066] In one embodiment, in combination Figure 1 and Figure 2 , the coupling assembly also includes a flying rod 190, the flying rod 190 is arranged between the two dual-mode resonant cavities 120 and is located directly above the CQ coupling structure 160, and the flying rod 190 is used to adjust the electrical coupling between the two dual-mode resonators 122. Specifically, the flying rod 190 includes a connecting rod 191 and two coupling plates 192, the two coupling plates 192 are respectively arranged in the two dual-mode resonant cavities 120, and the coupling plates 192 are used to couple with the dual-mode resonators 122 in the dual-mode resonant cavities 120. Specifically, the two coupling plates 192 are coupled with the first metal resonant column 142 and the second metal resonant column 152 respectively.

[0067] A third connecting hole (not shown) is also provided on the first metal partition 113, and the connecting rod 191 passes through the third connecting hole. The two ends of the connecting rod 191 are respectively connected to the two coupling plates 192, thereby enabling electrical coupling between the two dual-mode resonators 122 to be achieved through the flying rod 190, so as to adjust the working performance of the dual-mode filter 100.

[0068] In an exemplary embodiment of the present invention, Figure 1 The dual-mode filter 100 further includes an input end 210 and an output end 220, which are respectively arranged at the two ends of the length direction of the metal shell 110. It can be understood that the input end 210 and the output end 220 are respectively inserted into the two metal cavities, and the input end 210 is used to receive an external signal, and after being filtered by the dual-mode filter 100, the filtered signal is output to the outside through the output end 220. The input end 210 and the output end 220 can be any one of a coupling rod, a coupling disk 192, a coupling ring, and a tap. In this embodiment, the input end 210 and the output end 220 are both coupling rods.

[0069] The dual-mode filter 100 is further provided with a cover plate (not shown), the metal shell 110 is provided with an opening, and the cover plate is covered on the opening to close the opening of the metal shell 110. The metal resonant column is also correspondingly provided with a tuning screw (the tuning screw is referred to as a first tuning screw 240), the first tuning screw 240 passes through the cover plate and is inserted into the corresponding metal resonant column, so that the working frequency of the metal resonant column can be tuned by the first tuning screw 240.

[0070] The dielectric resonant column 124 is also provided with a tuning screw (the tuning screw is referred to as a second tuning screw, not shown), the second tuning screw passes through the bottom plate 115 of the metal shell 110 and is inserted into the dielectric resonant column 124, so as to tune the working frequency of the dielectric resonant column 124 through the second tuning screw. The cover plate is disposed opposite to the bottom plate 115 in the upper and lower directions.

[0071] The present invention further provides a communication device, wherein the communication device comprises the dual-mode filter 100 described above.

[0072] In one embodiment, the communication device is a duplexer, and the above-mentioned dual-mode filter 100 is built in the duplexer.

[0073] In one embodiment, the communication device is a combiner, and the dual-mode filter 100 described above is built into the combiner.

[0074] In one embodiment, the communication device is an antenna, and the dual-mode filter 100 described above is disposed in the antenna.

[0075] In summary, the dual-mode resonator of the dual-mode filter of the present invention is composed of a metal resonant column and a dielectric resonant column stacked up and down, which changes the coupling between the two dual-mode resonators from a horizontal position to a coupling in a vertical direction, greatly saving the cavity row space, and can generate a transmission zero point through a linear layout, and adjust the cross-coupling through a CQ coupling structure to achieve high suppression and low insertion loss effects, thereby optimizing the working performance of the dual-mode filter.

[0076] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

[0077] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A dual-mode filter, characterized in that: The invention comprises a shell, wherein a first resonant cavity and a second resonant cavity are arranged in the shell, a first resonator is arranged in the first resonant cavity, the first resonator comprises a first metal resonant column and a first dielectric resonant column stacked up and down, a second resonator is arranged in the second resonant cavity, the second resonator comprises a second metal resonant column and a second dielectric resonant column stacked up and down, and the first resonator and the second resonator are mutually coupled through a CQ coupling structure.

2. The dual-mode filter according to claim 1, characterized in that: The CQ coupling structure enables: the first metal resonance column and the second dielectric resonance column to be coupled to each other, the second metal resonance column and the first dielectric resonance column to be coupled to each other, and the first dielectric resonance column and the second dielectric resonance column to be coupled to each other.

3. The dual-mode filter according to claim 1, characterized in that: The CQ coupling structure includes a first coupling plate vertically disposed in the first resonant cavity and a second coupling plate vertically disposed in the second resonant cavity, so as to connect the first coupling plate and the second coupling plate.

4. The dual-mode filter according to claim 3, characterized in that: The first coupling plate is provided with a first extension branch, and the first extension branch is extended toward the first resonator; the second coupling plate is provided with a second extension branch, and the second extension branch is extended toward the second resonator.

5. The dual-mode filter according to any one of claims 1 to 4, characterized in that: The CQ coupling structure is integrally formed.

6. The dual-mode filter according to claim 1, characterized in that: The first dielectric resonator is provided with an arc notch, and the second dielectric resonator is provided with an arc notch.

7. The dual-mode filter according to claim 1, characterized in that: The first resonant cavity and the second resonant cavity form a CQ topological structure.

8. The dual-mode filter according to claim 1, characterized in that: A third resonant cavity and a fourth resonant cavity are also provided in the shell. The third resonant cavity is arranged adjacent to the first resonant cavity, and the fourth resonant cavity is arranged adjacent to the second resonant cavity. A first coupling structure is respectively provided between the first resonant cavity and the third resonant cavity, and between the second resonant cavity and the fourth resonant cavity, and the two first coupling structures are respectively protruded toward the first resonant cavity and the second resonant cavity.

9. The dual-mode filter according to claim 1, characterized in that: A second coupling structure is respectively disposed on the top surface of the first dielectric resonant column and the top surface of the second dielectric resonant column, and the second coupling structure includes a pair of coupling blocks.

10. The dual-mode filter according to claim 9, characterized in that: The size of the angle formed between the pair of coupling blocks is negatively correlated with the coupling strength between the first resonator and the second resonator.

11. The dual-mode filter according to claim 9, characterized in that: The height of the coupling block in the vertical direction of the first metal resonant column is positively correlated with the coupling strength between the first resonator and the second resonator.

12. The dual-mode filter according to claim 1, characterized in that: A flying rod is further provided between the first resonant cavity and the second resonant cavity, and the first metal resonant column and the second metal resonant column are coupled via the flying rod.

13. A communication device, characterized in that: Comprising the dual-mode filter as claimed in any one of claims 1 to 12.

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