Dual-mode filter and communication device

Abstract

The application provides a dual-mode filter and a communication device, the dual-mode filter comprising 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 comprises a first metal resonant column and a first dielectric resonant column which are arranged in a stack from top to bottom, 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 arranged in a stack from top to bottom, and the first resonator and the second resonator are coupled to each other through a CQ coupling structure. Compared with a conventional filter, the coupling between the resonant cavities is generally located at a horizontal position, the coupling between the resonant cavities is changed from the horizontal position to a vertical direction in the application, the space of the resonant cavities is greatly saved, a transmission zero point can be generated through a linear layout, and the cross coupling is adjusted through the CQ coupling structure, so that the effect of high suppression and low insertion loss is achieved.

Description

Technical Field

[0001] This invention belongs to the field of mobile communication technology, specifically relating to a dual-mode filter and a communication device configured with the dual-mode filter. Background Technology

[0002] As a core frequency selection device in communication systems, filters primarily function to filter and transmit specific frequency components required by the signal, while effectively suppressing interference from other unnecessary frequencies. With the continuous advancement of communication technology and the increasing diversification of communication needs, the performance requirements for filters in communication systems are constantly rising. While traditional filters can meet basic communication needs to a certain extent, their limitations in terms of loss, out-of-band rejection, size, and weight have gradually become apparent, making it difficult to meet the urgent demands of modern communication systems for high-performance, miniaturized, and low-cost filters.

[0003] To meet these ever-increasing demands, dual-mode filters have emerged. Compared to traditional filters, dual-mode filters offer significant performance improvements, particularly in loss and out-of-band rejection. This advantage has given dual-mode filters enormous application potential and market prospects in the communications field. However, despite these performance breakthroughs, the main challenges currently facing dual-mode filters lie in limitations related to structural design and size.

[0004] Currently, most mainstream dual-mode filters on the market are dielectric dual-mode filters. While these filters offer excellent performance, their complex structure and relatively large size present several inconveniences in practical applications. Firstly, the complex structure and large size increase the difficulty of filter debugging, making quality control and performance optimization during production more challenging. Secondly, the large size not only limits the application scenarios of the filters but also increases production costs to some extent, thus affecting the market competitiveness of dual-mode filters. These problems not only hinder the further promotion and application of dual-mode filters but also limit the potential for performance improvement and cost reduction in communication systems. Summary of the Invention

[0005] The primary objective of this invention is to solve at least one of the above-mentioned problems by providing a dual-mode filter and communication device.

[0006] To achieve the various objectives of this invention, the following technical solution is adopted: To meet one of the objectives of this invention, a dual-mode filter is provided, comprising a housing, wherein a first resonant cavity and a second resonant cavity are provided within the housing, the first resonant cavity is provided with a first resonator, the first resonator comprising a first metal resonant pillar and a first dielectric resonant pillar stacked vertically, the second resonant cavity is provided with a second resonator, the second resonator comprising a second metal resonant pillar and a second dielectric resonant pillar stacked vertically, and the first resonator and the second resonator are coupled to each other through a CQ coupling structure.

[0007] Furthermore, the CQ coupling structure enables the following: the first metal resonant pillar to be coupled to the second dielectric resonant pillar, the second metal resonant pillar to be coupled to the first dielectric resonant pillar, and the first dielectric resonant pillar to be coupled to the second dielectric resonant pillar.

[0008] Furthermore, 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, for connecting the first coupling plate and the second coupling plate.

[0009] In one embodiment, the first coupling piece has a first extension branch extending toward the first resonator; the second coupling piece has a second extension branch extending toward the second resonator.

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

[0011] In one embodiment, the first dielectric resonator has an arc-shaped notch, and the second dielectric resonator has an arc-shaped notch.

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

[0013] In one embodiment, the housing is further provided with a third resonant cavity and a fourth resonant cavity. 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 provided between the first resonant cavity and the third resonant cavity, and between the second resonant cavity and the fourth resonant cavity. The two first coupling structures protrude toward the first resonant cavity and the second resonant cavity, respectively.

[0014] In one embodiment, the top surfaces of the first dielectric resonant pillar and the second dielectric resonant pillar are respectively provided with a second coupling structure, and the second coupling structure includes a pair of coupling blocks.

[0015] In one embodiment, the size of the included 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, the height of the coupling block in the vertical direction of the first metal resonant pillar is positively correlated with the coupling strength between the first resonator and the second resonator.

[0017] In one embodiment, a fly 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 through the fly rod.

[0018] One of the objectives of this invention is to provide a communication device comprising a dual-mode filter as described in any of the preceding objectives.

[0019] Compared with existing technologies, 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 a first resonator and a second resonator to change the coupling between resonant cavities from the horizontal direction to the vertical direction. This greatly saves cavity space, significantly reduces the space requirement of the dual-mode filter in the horizontal direction, and makes the dual-mode filter structure more compact, making it more suitable for applications with strict space requirements, such as mobile communication equipment and radar systems.

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

[0021] (3) The dual-mode filter of the present invention adjusts the cross-coupling between resonant cavities through a 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 and prevent them from interfering with the normal operation of the system; while low insertion loss ensures that the dual-mode filter will not cause excessive energy loss when transmitting useful signals, thereby improving the overall performance of the system.

[0022] (4) Due to the use of a first resonator, a second resonator, and a CQ coupling structure, the dual-mode filter of this invention has higher flexibility and tunability. The size, shape, and parameters of the coupling structure 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 adapt to the needs of different application scenarios. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a 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 This is a schematic diagram of the assembly between the coupling component and the two dual-mode resonators of the dual-mode filter according to the first embodiment of the present invention.

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

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

[0027] Figure 5 This is a schematic diagram of the topology of a dual-mode filter according to a typical embodiment of the present invention.

[0028] Figure 6 The above are simulation diagrams of the S-parameters corresponding to the two transmission zeros of the dual-mode filter in the first embodiment of the present invention.

[0029] Figure 7 The above are simulation diagrams of the S-parameters corresponding to the two transmission zeros of the dual-mode filter in the second embodiment of the present invention.

[0030] Figure 8 The simulation diagrams show the S-parameters corresponding to the two transmission zeros of the dual-mode filter in the third embodiment of the present invention. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0032] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated 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, nor does it 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 say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0034] The present invention provides a dual-mode filter, wherein the dual-mode resonator of the dual-mode filter includes metal resonant pillars and dielectric resonant pillars stacked on top of each other, so as to improve the space utilization of the dual-mode filter, facilitate the miniaturization of the dual-mode filter, and facilitate the miniaturization of communication equipment that installs the dual-mode filter.

[0035] In a typical embodiment of the present invention, combined with Figure 1 The dual-mode filter 100 includes a metal housing 110 and a coupling component disposed within the metal housing 110. The metal housing 110 has multiple resonant cavities 111, such as 4, 5, 6, or 8 resonant cavities. In this embodiment, the invention is described using the example of 4 resonant cavities 111 in the metal housing 110, but this should not be construed as a limitation of the invention.

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

[0037] The dual-mode resonant cavity 120 is equipped with a dual-mode resonator 122, combined with Figure 2 The dual-mode resonator 122 includes a metal resonant pillar 123 and a dielectric resonant pillar 124. The metal resonant pillar 123 and the dielectric resonant pillar 124 are stacked vertically along the vertical direction of the metal resonant pillar 123, so that the metal resonant pillar 123 and the dielectric resonant pillar 124 can be arranged simultaneously in the dual-mode resonant cavity 120, thereby improving the space utilization of the dual-mode resonant cavity 120 and facilitating the miniaturization of the dual-mode filter 100.

[0038] Specifically, along the vertical direction, the dielectric resonator 124 includes a bottom surface and a top surface 1241, both of which are metallized. It is understood that a metal layer is provided on both the bottom and top surfaces 1241. In this embodiment, it is recommended that the metal layers on both the bottom and top surfaces 1241 be formed by electroplating, or that a metal sheet be deposited on the bottom and top surfaces 1241 to form a metal layer, but this should not be construed as a limitation of the present invention.

[0039] Combination Figure 1 and Figure 2 The bottom surface of the dielectric resonant pillar 124 is electrically connected to the bottom wall 121 of the dual-mode resonant cavity 120 to achieve grounding. In this embodiment, the invention is described using the example of welding the bottom surface to the bottom wall 121, thereby electrically connecting the dielectric resonant pillar 124 to the dual-mode resonant cavity 120.

[0040] Combination Figure 2 Along the vertical direction, the bottom end of the metal resonant column 123 is disposed on the top surface 1241 of the dielectric resonant column 124, and the bottom end of the metal resonant column 123 is electrically connected to the top surface 1241. In this embodiment, the invention is described by taking the example of welding the bottom end of the metal resonant column 123 to the top surface 1241 so that the metal resonant column 123 and the dielectric resonant column 124 are electrically connected.

[0041] In one embodiment, an arc-shaped notch 1242 is provided on the outer surface of the dielectric resonator 124. The arc-shaped notch 1242 is recessed from the outer surface of the dielectric resonator 124 towards the central axis of the dielectric resonator 124. In this embodiment, the dielectric resonator 124 has two modes, one of which operates selectively. The arc-shaped notch 1242 is used to push the mode of the dielectric resonator 124 in the non-operating state to a higher frequency, so as to avoid affecting the operating performance of the mode in the operating state.

[0042] In a further embodiment, the opening of the arc notch 1242 faces the sidewall 112 of the metal housing 110 to avoid coupling between the non-operating modes of the two dielectric resonator pillars 124, thereby affecting the electrical performance of the dual-mode filter 100.

[0043] In a typical embodiment of the present invention, combined with Figure 2 , Figure 3 as well as Figure 4 The coupling component includes a CQ coupling structure 160, which is disposed 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, thereby adjusting the coupling strength between the two dual-mode resonators 122 and adjusting the working performance of the dual-mode filter 100.

[0044] Specifically, in combination Figure 1 A metal partition (referred to as the 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 provided on the first metal partition 113. The first connecting hole is located near the 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. The pair of coupling pieces 162 are respectively disposed within the two dual-mode resonant cavities 120. The bottom end 1621 of each coupling piece 162 along the vertical direction is welded to the bottom wall 121 of the dual-mode resonant cavity 120 to achieve electrical connection with the dual-mode resonant cavity 120. The connecting piece 161 passes through the first connecting hole, and both 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 via the connecting piece 161. In this embodiment, it is recommended that the CQ coupling structure 160 be integrally formed, but this is not to be construed as a limitation of the present invention.

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

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

[0048] The first coupling piece 163 is disposed in the first resonant cavity 140, and the first coupling piece 163 can be coupled to the first metal resonant pillar 142 and the first dielectric resonant pillar 143 in the first resonant cavity 140 respectively; the second coupling piece 164 is disposed in the second resonant cavity 150, and the second coupling piece 164 can be coupled to the second metal resonant pillar 152 and the second dielectric resonant pillar 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 pillar 142 can be coupled to the second dielectric resonant pillar 153, the first dielectric resonant pillar 143 can be coupled to the second dielectric resonant pillar 153, and the first dielectric resonant pillar 143 can be coupled to the second metal resonant pillar 152. Through the CQ coupling structure 160, the coupling strength among the first metal resonant pillar 142, the first dielectric resonant pillar 143, the second metal resonant pillar 152, and the second dielectric resonant pillar 153 can be adjusted to regulate the transmission zero of the dual-mode filter 100 and improve its operating performance. In some embodiments, the CQ coupling structure also couples the first metal resonant pillar 142 to the second metal resonant pillar 152.

[0050] In the first embodiment, combined with Figure 2 The two ends of the connecting piece 161 are respectively connected to the top end of the first coupling piece 163 and the top end 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 be connected to form an n-shaped structure, but this should not be construed as a limitation of the present invention.

[0051] In this embodiment, see Figure 6 , Figure 6The above are simulation diagrams of the S-parameters corresponding to the two transmission zeros of the dual-mode filter according to the first embodiment of the present invention. The CQ coupling structure 160 increases the electrical coupling between the first dielectric resonant pillar 143 and the second metal resonant pillar 152, and also increases the electrical coupling between the first metal resonant pillar 142 and the second dielectric resonant pillar 153, so that the transmission zeros of the dual-mode filter 100 become high on the left and low on the right, thereby adjusting the working performance of the dual-mode filter 100.

[0052] In the second embodiment, combined with Figure 3 Based on the CQ coupling structure 160 of the first embodiment, the top end 1631 of the first coupling piece 163 protrudes vertically relative to the connecting piece 161, and the top end 1641 of the second coupling piece 164 protrudes vertically relative to the connecting piece 161. In this embodiment, it is recommended that the first coupling piece 163, the connecting piece 161, and the second coupling piece 164 be connected to form an H-shaped structure, but this should not be construed as a limitation of the present invention.

[0053] In this embodiment, see Figure 7 , Figure 7 The following is a simulation diagram of the S-parameters corresponding to the two transmission zeros of the dual-mode filter according to the second embodiment of the present invention. The CQ coupling structure 160 makes the coupling between the first dielectric resonant pillar 143 and the second metal resonant pillar 152 zero, and makes the coupling between the first metal resonant pillar 142 and the second dielectric resonant pillar 153 zero, so that the dual-mode filter 100 achieves transmission zero balance, that is, the left and right zeros are equal, and the working performance of the dual-mode filter 100 is adjusted accordingly.

[0054] In the third embodiment, combined with Figure 4 Based on the CQ coupling structure 160 of the second embodiment, the coupling plate 162 further includes an extension branch 1622. The extension branch 1622 is connected to the coupling plate 162 and extends towards the metal resonant pillar 123 within the dual-mode resonant cavity 120. In this embodiment, it is recommended that the extension branch 1622 be arranged laterally relative to the coupling plate 162. In this embodiment, it is recommended that the extension branch 1622 be connected to the coupling plate 162 to form a “┓” and “┏” or “┤” and “├” shaped structure, but this should not be construed as a limitation of the present invention.

[0055] Specifically, the first coupling piece 163 is provided with an extension branch (referred to as the first extension branch 1632), which extends from the first coupling piece 163 toward the first metal resonant pillar 142 in the first resonant cavity 140; the second coupling piece 164 is provided with an extension branch (referred to as the second extension branch 1642), which extends from the second coupling piece 164 toward the second metal resonant pillar 152 in the second resonant cavity 150.

[0056] In this embodiment, see Figure 8 , Figure 8 The following is a simulation diagram of the S-parameters corresponding to the two transmission zeros of the dual-mode filter according to the third embodiment of the present invention. The CQ coupling structure 160 increases the magnetic coupling between the first dielectric resonant pillar 143 and the second metal resonant pillar 152, and also enhances the magnetic coupling between the first metal resonant pillar 142 and the second dielectric resonant pillar 153, thereby making the transmission zeros of the dual-mode filter 100 lower on the left and higher on the right, and correspondingly adjusting the working performance of the dual-mode filter 100.

[0057] Therefore, in conjunction with the first, second, and third embodiments, it can be seen that the coupling magnitude 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 zeros of the dual-mode filter 100 and thus adjusting the working performance of the dual-mode filter 100.

[0058] In a typical embodiment of the present invention, combined with Figure 5 The two dual-mode resonant cavities 120 together form a CQ topology to facilitate the adjustment of the left and right transmission zeros of the dual-mode filter 100 and optimize communication performance.

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

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

[0061] The coupling component includes a first coupling structure 170, which is disposed between adjacent dual-mode resonant cavities 120 and metal resonant cavities 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 (referred to as the second metal partition 114) is formed between the adjacent dual-mode resonant cavity 120 and the metal resonant cavity 130. The second metal partition 114 has a second connecting hole (not shown), and the first coupling structure 170 is disposed in the second connecting hole, protruding towards the dual-mode resonant cavity 120. In this embodiment, it is recommended that the first coupling structure be a block structure, but this should not be construed as a limitation of 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 disposed on the top surface 1241 of the dielectric resonator within the dual-mode resonant cavity 120, located outside the top surface 1241, and situated on the side of the top surface 1241 closest 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 operating performance of the dual-mode filter 100. In this embodiment, it is recommended that the coupling blocks 181 be rectangular block structures, but this should not be construed as a limitation of the invention.

[0064] In one embodiment, the pair of coupling blocks 181 are disposed on both sides of the longitudinal central axis of the metal housing 110. The angle between 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 between the two coupling blocks 181, the stronger the coupling strength between the two dual-mode resonators 122, and vice versa. Therefore, the present invention can adjust the coupling strength between the two dual-mode resonators 122 by adjusting the angle between the pair of coupling blocks 181, thereby adjusting the operating 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, and vice versa. 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 operating performance of the dual-mode filter 100.

[0066] In one embodiment, combined Figure 1 and Figure 2 The coupling assembly further includes a boom 190, which is disposed between the two dual-mode resonant cavities 120 and directly above the CQ coupling structure 160. The boom 190 is used to adjust the electrical coupling between the two dual-mode resonators 122. Specifically, the boom 190 includes a connecting rod 191 and two coupling disks 192, which are respectively disposed within the two dual-mode resonant cavities 120. The coupling disks 192 are used to couple with the dual-mode resonators 122 within their respective dual-mode resonant cavities 120. Specifically, the two coupling disks 192 are respectively coupled to the first metal resonant pillar 142 and the second metal resonant pillar 152.

[0067] The first metal partition 113 is also provided with a third connecting hole (not shown). The connecting rod 191 passes through the third connecting hole, and the two ends of the connecting rod 191 are respectively connected to the two coupling disks 192. Thus, the two dual-mode resonators 122 can be electrically coupled through the flying rod 190, so as to adjust the working performance of the dual-mode filter 100.

[0068] In a typical embodiment of the present invention, combined with Figure 1 The dual-mode filter 100 further includes an input terminal 210 and an output terminal 220, which are respectively located at both ends of the length direction of the metal housing 110. It can be understood that the input terminal 210 and the output terminal 220 are respectively inserted into the two metal cavities. The input terminal 210 is used to receive external signals, which are then filtered by the dual-mode filter 100 and output through the output terminal 220. The input terminal 210 and the output terminal 220 can be any one of a coupling rod, a coupling disk 192, a coupling ring, or a tap. In this embodiment, both the input terminal 210 and the output terminal 220 are coupling rods.

[0069] The dual-mode filter 100 is further provided with a cover plate (not shown), and the metal housing 110 has an opening. The cover plate is placed over the opening to close it. Each metal resonant post is also correspondingly provided with a tuning screw (referred to as the first tuning screw 240). The first tuning screw 240 passes through the cover plate and is inserted into the corresponding metal resonant post to tune the operating frequency of the metal resonant post.

[0070] The dielectric resonator 124 is also equipped with a tuning screw (referred to as the second tuning screw, not shown). The second tuning screw passes through the base plate 115 of the metal housing 110 and is inserted into the dielectric resonator 124 to tune the operating frequency of the dielectric resonator 124. The cover plate and the base plate 115 are arranged vertically opposite each other.

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

[0072] In one embodiment, the communication device is a duplexer, which has a built-in dual-mode filter 100 as described above.

[0073] In one embodiment, the communication device is a combiner, which has a built-in dual-mode filter 100 as described above.

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

[0075] In summary, the dual-mode resonator of the dual-mode filter of the present invention is composed of metal resonant pillars and dielectric resonant pillars stacked one on top of the other. This changes the coupling between the two dual-mode resonators from a horizontal position to a vertical coupling, which greatly saves cavity space. A transmission zero can be generated through a linear layout, and the cross coupling can be adjusted through a CQ coupling structure to achieve high suppression and low insertion loss, thereby optimizing the working performance of the dual-mode filter.

[0076] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions as those in the present invention.

[0077] Although the subject matter has been described using language specific to structural features and / or methodological logic, 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. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A dual-mode filter, characterized in that, The device includes a housing, within which a first resonant cavity and a second resonant cavity are provided. The first resonant cavity contains a first resonator, which includes a first metal resonant pillar and a first dielectric resonant pillar stacked vertically. The second resonant cavity contains a second resonator, which includes a second metal resonant pillar and a second dielectric resonant pillar stacked vertically. The first resonator and the second resonator are coupled to each other through a CQ coupling structure. The top surface of the first dielectric resonator and the top surface of the second dielectric resonator are respectively provided with a second coupling structure, and the second coupling structure includes a pair of coupling blocks.

2. The dual-mode filter as described in claim 1, characterized in that, The CQ coupling structure enables the following: the first metal resonant pillar to be coupled to the second dielectric resonant pillar, the second metal resonant pillar to be coupled to the first dielectric resonant pillar, and the first dielectric resonant pillar to be coupled to the second dielectric resonant pillar.

3. The dual-mode filter as described in 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, which serves as a connecting piece to connect the first coupling plate and the second coupling plate.

4. The dual-mode filter as described in claim 3, characterized in that, The first coupling plate has a first extension branch that extends toward the first resonator; the second coupling plate has a second extension branch that extends toward the second resonator.

5. The dual-mode filter as described in any one of claims 1 to 4, characterized in that, The CQ coupling structure is integrally molded.

6. The dual-mode filter as described in claim 1, characterized in that, The first dielectric resonant pillar has an arc-shaped notch, and the second dielectric resonant pillar has an arc-shaped notch.

7. The dual-mode filter as described in claim 1, characterized in that, The first resonant cavity and the second resonant cavity constitute a CQ topology.

8. The dual-mode filter as described in claim 1, characterized in that, The housing also includes a third resonant cavity and a fourth resonant cavity. The third resonant cavity is adjacent to the first resonant cavity, and the fourth resonant cavity is adjacent to the second resonant cavity. A first coupling structure is provided between the first resonant cavity and the third resonant cavity, and between the second resonant cavity and the fourth resonant cavity. The two first coupling structures protrude toward the first resonant cavity and the second resonant cavity, respectively.

9. The dual-mode filter as described in claim 1, characterized in that, The angle formed between the pair of coupling blocks is negatively correlated with the coupling strength between the first resonator and the second resonator.

10. The dual-mode filter as described in claim 1, characterized in that, The height of the coupling block in the vertical direction of the first metal resonant pillar is positively correlated with the coupling strength between the first resonator and the second resonator.

11. The dual-mode filter as described in claim 1, characterized in that, A flying rod is also 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 through the flying rod.

12. A communication device, characterized in that, Includes the dual-mode filter as described in any one of claims 1 to 11.

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