Filter

Abstract

The utility model relates to the technical field of communication, and provides a filter which comprises a cavity, a capacitive flying rod structure and a plurality of resonators installed in the cavity, the cavity is provided with an isolation wall, and the isolation wall is provided with a first coupling window. The plurality of resonators comprise a first resonator, a second resonator and a third resonator which are positioned on one side of the isolation wall and are electrically connected in sequence along the length direction of the isolation wall, and the plurality of resonators further comprise a fourth resonator, a fifth resonator and a sixth resonator which are positioned on the other side of the isolation wall and are electrically connected in sequence along the length direction of the isolation wall; the capacitive flying rod structure is arranged in the first coupling window and located between the second resonator and the fifth resonator. The filter is provided with only one capacitive flying rod structure, at least three radio frequency signal transmission paths are formed, at least two transmission zero points are generated, the filtering effect of strong suppression is achieved, the material cost of the filter is reduced, the sensitivity of the filter is reduced, and the reliability and stability of the filter are improved.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a filter. Background Art

[0002] A filter is a device or circuit that processes signals. Its main function is to allow useful signals to pass through without attenuation as much as possible, while attenuating useless signals as much as possible. It is often used as a frequency selection device to select the communication signal frequency and filter out clutter or interference signals outside the communication signal frequency. It is widely used in mobile base stations to reduce intermodulation signal interference and generate high-quality communication signals. It is an indispensable component in electronic communication systems.

[0003] The filter consists of a cavity and multiple resonators installed within it. These resonators are electrically connected in sequence to form a filter channel. As communication systems are built, equipment vendors are demanding increasingly stringent requirements for filter suppression. To prevent crosstalk between different base stations or between base stations of different operators, filters are being required to suppress passband sidebands with higher precision. To achieve steep sideband suppression, transmission zeros are required.

[0004] Flying rods can be placed between two non-adjacent resonators in a filter channel to create capacitive coupling and form a transmission zero, achieving strong suppression and thus adjusting the out-of-band suppression of the passband. Each flying rod creates a transmission zero, resulting in two or more transmission zeros. This requires more flying rods, increasing the filter's sensitivity. Excessive flying rods also increase material costs. Utility Model Content

[0005] The purpose of the utility model is to provide a filter, aiming to solve the technical problem of high material cost in existing filters.

[0006] The present application provides a filter, which includes a cavity, a capacitive flying rod structure, and a plurality of resonators installed in the cavity, wherein the cavity is provided with an isolation wall, and the isolation wall has a first coupling window. The plurality of resonators include a first resonator, a second resonator, and a third resonator located on one side of the isolation wall and electrically connected in sequence along the length direction of the isolation wall. The plurality of resonators also include a fourth resonator, a fifth resonator, and a sixth resonator located on the other side of the isolation wall and electrically connected in sequence along the length direction of the isolation wall. The first resonator and the fourth resonator are electrically connected through a first coupling rib provided in the cavity, and the third resonator and the sixth resonator are electrically connected through a second coupling rib provided in the cavity. The capacitive flying rod structure is provided in the first coupling window and is located between the second resonator and the fifth resonator.

[0007] In one embodiment, the first coupling rib is located at the first end of the isolation wall, and two ends of the first coupling rib are in contact and conduction with the first resonator and the fourth resonator respectively;

[0008] And / or, the second coupling rib is located at the second end of the isolation wall, and two ends of the second coupling rib are in contact with and conductive with the third resonator and the sixth resonator respectively.

[0009] In one embodiment, the first coupling rib is integrally formed with the cavity;

[0010] And / or, the second coupling rib is integrally formed with the cavity.

[0011] In one embodiment, the filter further includes a third coupling rib, wherein the third coupling rib is arranged between the first resonator and the second resonator, and / or the third coupling rib is arranged between the second resonator and the third resonator.

[0012] In one embodiment, the filter further includes a fourth coupling rib, wherein the fourth coupling rib is arranged between the first resonator and the second resonator, and / or the fourth coupling rib is arranged between the second resonator and the third resonator.

[0013] In one embodiment, the capacitive flying rod structure includes an insulating card seat and a coupling flying rod, the insulating card seat is installed in the first coupling window, the coupling flying rod is passed through the insulating card seat, and the two ends of the coupling flying rod extend toward the second resonator and the fifth resonator respectively and are arranged at intervals.

[0014] In one embodiment, the filter further includes an input terminal and a first output terminal, the first resonator is electrically connected to the input terminal, and the sixth resonator is electrically connected to the first output terminal.

[0015] In one embodiment, the plurality of resonators further includes a seventh resonator, and the seventh resonator is disposed between the first resonator and the input terminal, and is electrically connected to the first resonator and the input terminal respectively.

[0016] In one embodiment, the filter further includes a second output terminal, and the plurality of resonators further include an eighth resonator, the eighth resonator being electrically connected to the input terminal and the second output terminal, respectively, and the eighth resonator being located on a side of the first resonator away from the isolation wall.

[0017] In one embodiment, the cavity is provided with a first isolation slot, and the first isolation slot is located between the first resonator and the eighth resonator.

[0018] In one embodiment, the plurality of resonators further include a ninth resonator and a tenth resonator, the ninth resonator and the tenth resonator are located between the eighth resonator and the second output terminal, and the eighth resonator, the ninth resonator, the tenth resonator and the second output terminal are electrically connected in sequence.

[0019] In one embodiment, the input terminal and the first output terminal are located at opposite ends of the cavity, and the second output terminal and the first output terminal are located at the same end of the cavity.

[0020] The filter provided by the present invention has the following beneficial effects: the radio frequency signal can be transmitted in sequence along the first resonator, the second resonator, the third resonator, the second coupling rib and the sixth resonator, can be transmitted in sequence along the first resonator, the first coupling rib, the fourth resonator, the fifth resonator and the sixth resonator, or can be transmitted in sequence along the first resonator, the second resonator, the capacitive flying rod structure, the fifth resonator and the sixth resonator. The radio frequency signal has at least three transmission paths, and only one capacitive flying rod structure is required to generate at least two transmission zero points to achieve a strong suppression filtering effect, saving the number and assembly of capacitive flying rod structures, solving the technical problem of high material cost of existing filters, thereby reducing the material cost of the filter, reducing the sensitivity of the filter, and helping to improve the reliability and stability of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 Schematic diagram of the structure of a filter in the related art;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the filter after removing the cavity;

[0024] Figure 3 A schematic diagram of the structure of a filter provided in an embodiment of the present utility model;

[0025] Figure 4 for Figure 3 Schematic diagram of the structure of the filter after removing the cavity;

[0026] Figure 5 for Figure 3 Another view of the filter without the cavity;

[0027] Figure 6 for Figure 3 The simulation waveform of the filter in .

[0028] Among them, the reference numerals in the figures are:

[0029] 110, cavity; 111, first isolation groove; 112, second isolation groove; 120, isolation wall; 121, first coupling window;

[0030] 200, resonator; 201, first resonator; 202, second resonator; 203, third resonator; 204, fourth resonator; 205, fifth resonator; 206, sixth resonator; 207, seventh resonator; 208, eighth resonator; 209, ninth resonator; 210, tenth resonator; 211, eleventh resonator;

[0031] 300, capacitive flying rod structure; 310, insulating card seat; 320, coupling flying rod;

[0032] 410, first coupling rib; 420, second coupling rib; 430, third coupling rib; 440, fourth coupling rib; 450, input terminal; 460, first output terminal; 470, second output terminal; 480, tuning structure;

[0033] 500. Fly rod assembly. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] Combine Figure 1 and Figure 2 In the related art, the filter includes a cavity 110 and a plurality of resonators 200 installed in the cavity 110. A flying rod assembly 500 can be set between two non-adjacent resonators 200 on the filter channel to generate capacitive coupling to form a transmission zero point, thereby achieving a strong suppression effect and adjusting the out-of-band suppression of the passband. When the filter needs to form two transmission zero points, two flying rod assemblies 500 need to be assembled. The more transmission zero points are required, the more flying rod assemblies 500 are required, resulting in an increase in material costs; and a larger number of flying rod assemblies 500 occupy a larger assembly space, and the arrangement in the cavity 110 is more complicated, resulting in an increase in the volume of the cavity 110 and a complex internal structure of the cavity 110. At the same time, the more flying rod assemblies 500 are assembled, the worse the consistency of the filter, which increases the sensitivity of the filter and causes a decrease in the reliability and stability of the filter.

[0040] Combine Figures 3 to 5The present application provides a filter. The filter includes a cavity 110, a capacitive flying rod structure 300, and a plurality of resonators 200 installed in the cavity 110. The cavity 110 is provided with a partition wall 120, and the partition wall 120 has a first isolation window 121. The plurality of resonators 200 include a first resonator 201, a second resonator 202, and a third resonator 203 located on one side of the partition wall 120 and electrically connected in sequence along the length direction X of the partition wall 120. The plurality of resonators 200 also include a first resonator 201, a second resonator 202, and a third resonator 203 located on the other side of the partition wall 120 and electrically connected in sequence along the length direction X of the partition wall 120. The fourth resonator 204, the fifth resonator 205 and the sixth resonator 206 are electrically connected in sequence along the length direction of the wall 120, the first resonator 201 and the fourth resonator 204 are electrically connected via a first coupling rib 410 disposed in the cavity 110, the third resonator 203 and the sixth resonator 206 are electrically connected via a second coupling rib 420 disposed in the cavity 110, and the capacitive flying rod structure 300 is disposed in the first isolation window 121 and is located between the second resonator 202 and the fifth resonator 205.

[0041] In this embodiment, the RF signal can be transmitted in sequence along the first resonator 201, the second resonator 202, the third resonator 203, the second coupling rib 420 and the sixth resonator 206, can be transmitted in sequence along the first resonator 201, the first coupling rib 410, the fourth resonator 204, the fifth resonator 205 and the sixth resonator 206, or can be transmitted in sequence along the first resonator 201, the second resonator 202, the capacitive flying rod structure 300, the fifth resonator 205 and the sixth resonator 206. In this way, the RF signal has at least three transmission paths for realizing signal transmission and filtering processing, which plays a role in selecting the signal of the required frequency band. The filter only needs to be equipped with a capacitive flying rod structure 300 to generate at least two transmission zero points A and B at the low end (please refer to Figure 6 ) to achieve a strong suppression filtering effect, which is suitable for design requirements of strong passband low sideband suppression and large bandwidth. At the same time, it saves the number and assembly of the capacitive flying rod structure 300, reduces the material cost of the filter, reduces the sensitivity of the filter, and is conducive to improving the reliability and stability of the filter.

[0042] Furthermore, with the development of 5G communication systems, the integration requirements for their equipment are becoming increasingly higher. Miniaturization and lightweighting of filters are a future application trend, requiring existing filters to be more compact and simpler in structural design. The first resonator 201, the second resonator 202, and the third resonator 203 are sequentially distributed along the length direction X of the partition wall 120. The fourth resonator 204, the fifth resonator 205, and the sixth resonator 206 are also sequentially distributed along the length direction X of the partition wall 120. This results in a regular and simple arrangement within the cavity 110, high space utilization within the cavity 110, and facilitates miniaturized filter design.

[0043] The cavity 110 is used to accommodate the resonator 200 and provide a closed cavity to generate resonance and transmit electromagnetic signals. The main material of the cavity 110 can be plastic, metal or ceramic, which is not limited here.

[0044] In some embodiments, the cavity 110 includes a first plastic substrate and a first metal layer covering at least one side surface of the first plastic substrate. The first metal layer can cover only one side surface of the first plastic substrate, or the first metal layer can cover two opposite sides of the first plastic substrate; the first metal layer can also cover the entire surface of the first plastic substrate, that is, the entire outer surface of the first plastic substrate is covered with the first metal layer. Compared with metal materials, the use of the first plastic substrate is conducive to lightweight design of the filter and helps reduce manufacturing costs. At the same time, plastic materials have better plasticity and are easier to process and form. Whether using thermal processing methods such as injection molding, extrusion, and blow molding, or mechanical processing methods such as cutting, stamping, and bending, it is possible to flexibly, conveniently, and quickly manufacture a combination of cavities 110 of various shapes and structures as required. The molding process is good, the finished product has high consistency, and it can be mass-produced with high production efficiency.

[0045] Combine Figure 4 and Figure 5 The isolation wall 120 isolates the resonator 200 that does not need to be coupled, shields irrelevant signals, and prevents signal interference, so that a complete and orderly signal channel is formed in the cavity 110. The isolation wall 120 can be a metal part; the isolation wall 120 can also be made of a non-metallic part such as plastic or ceramic as a base, and a metal layer is covered on the surface of the non-metallic base. When the non-metallic base of the isolation wall 120 is a non-metallic part such as plastic or ceramic, it is conducive to reducing manufacturing costs. At the same time, the plastic material has good plasticity and can be flexibly processed and manufactured by thermal processing or mechanical processing. That is, the isolation wall 120 of various shapes and structures can be made by processing methods such as injection molding, extrusion, blow molding, etc., and can also be made by mechanical processing methods such as cutting, stamping, and bending.

[0046] In some embodiments, the partition wall 120 is disposed within the cavity 110 by integral molding, welding, riveting, crimping, screw fastening, threaded connection, or clamping. When the partition wall 120 and the cavity 110 are integrally formed, there is no need to assemble the partition wall 120 to the cavity 110, thereby reducing assembly errors, improving assembly consistency, and providing high connection strength and high product performance stability.

[0047] In some embodiments, combined Figure 4 and Figure 5The first coupling rib 410 is located at the first end of the isolation wall 120. The two ends of the first coupling rib 410 are in contact and conductive with the first resonator 201 and the fourth resonator 204, respectively, facilitating stable signal transmission from the first resonator 201 to the fourth resonator 204 and achieving high energy transmission efficiency. The first coupling rib 410 is disposed at the end of the isolation wall 120, which facilitates the design of a reduced length of the isolation wall 120, facilitates the arrangement of the first coupling rib 410, and reduces the difficulty of setting up the first coupling rib 410. It is understood that in other embodiments, the isolation wall 120 extends beyond the first resonator 201 and the fourth resonator 204, and the isolation wall 120 is provided with a second coupling window for the first coupling rib 410 to pass through, thereby achieving coupling between the first resonator 201 and the fourth resonator 204.

[0048] In some embodiments, combined Figure 4 and Figure 5 The second coupling rib 420 is located at the second end of the isolation wall 120. The two ends of the second coupling rib 420 are in contact and conductive with the third resonator 203 and the sixth resonator 206, respectively, facilitating stable signal transmission from the third resonator 203 to the sixth resonator 206 and achieving high energy transmission efficiency. The second coupling rib 420 is disposed at the end of the isolation wall 120, which facilitates the design of a reduced length of the isolation wall 120, facilitates the arrangement of the second coupling rib 420, and reduces the difficulty of setting up the second coupling rib 420. It will be understood that in other embodiments, the isolation wall 120 extends beyond the third resonator 203 and the sixth resonator 206, and the isolation wall 120 is provided with a third coupling window for the second coupling rib 420 to pass through, thereby achieving coupling between the third resonator 203 and the sixth resonator 206.

[0049] In one embodiment, the first coupling rib 410 and the cavity 110 are integrally formed, and there is no need to assemble the first coupling rib 410 to the cavity 110, which reduces assembly errors, improves assembly consistency, and improves the connection stability between the two. It can also avoid nonlinear contact generated when the first coupling rib 410 and the cavity 110 are separately connected, thereby effectively reducing passive intermodulation and improving performance indicators such as insertion loss.

[0050] It is understandable that in other embodiments, the first coupling rib 410 and the cavity 110 may be fixedly connected by, but not limited to, bonding, welding, threaded connection, screw fastening, snap connection, crimping, plugging, sleeve connection, interference fit, and the like.

[0051] In one embodiment, the second coupling rib 420 and the cavity 110 are integrally formed, and there is no need to assemble the second coupling rib 420 to the cavity 110, which reduces assembly errors, improves assembly consistency, and improves the connection stability between the two. It can also avoid nonlinear contact generated when the second coupling rib 420 and the cavity 110 are separately connected, thereby effectively reducing passive intermodulation and improving performance indicators such as insertion loss.

[0052] It is understandable that in other embodiments, the second coupling rib 420 and the cavity 110 may be fixedly connected by, but not limited to, bonding, welding, threaded connection, screw fastening, snap connection, crimping, plugging, sleeve connection, interference fit, and the like.

[0053] In one embodiment, the combination Figure 4 The filter further includes a third coupling rib 430. Optionally, the third coupling rib 430 is disposed between the first resonator 201 and the second resonator 202, facilitating stable signal transmission from the first resonator 201 to the second resonator 202 with high energy transfer efficiency. Optionally, the third coupling rib 430 is disposed between the second resonator 202 and the third resonator 203, facilitating stable signal transmission from the second resonator 202 to the third resonator 203 with high energy transfer efficiency. Optionally, the third coupling rib 430 is disposed both between the second resonator 202 and the third resonator 203 and between the first resonator 201 and the second resonator 202.

[0054] It is understood that in other embodiments, the third coupling rib 430 may not be provided between the first resonator 201 and the second resonator 202, and the first resonator 201 and the second resonator 202 may transmit signals through the air space between them. The third coupling rib 430 may not be provided between the second resonator 202 and the third resonator 203, and the second resonator 202 and the third resonator 203 may transmit signals through the air space between them.

[0055] Specifically, the third coupling rib 430 and the cavity 110 can be fixedly connected by, but not limited to, integral molding bonding, welding, threaded connection, screw fastening, snap connection, crimping, plug-in connection, sleeve connection, interference fit, and the like.

[0056] In one embodiment, the combination Figure 4The filter further includes a fourth coupling rib 440. Optionally, the fourth coupling rib 440 is disposed between the fourth resonator 204 and the fifth resonator 205, facilitating stable signal transmission from the fourth resonator 204 to the fifth resonator 205 with high energy transfer efficiency. Optionally, the fourth coupling rib 440 is disposed between the fifth resonator 205 and the sixth resonator 206, facilitating stable signal transmission from the fifth resonator 205 to the sixth resonator 206 with high energy transfer efficiency. Optionally, the fourth coupling rib 440 is disposed both between the fifth resonator 205 and the sixth resonator 206, and between the fourth resonator 204 and the fifth resonator 205.

[0057] It is understood that in other embodiments, the fourth coupling rib 440 may not be provided between the fourth resonator 204 and the fifth resonator 205 , and / or between the fifth resonator 205 and the sixth resonator 206 .

[0058] Specifically, the fourth coupling rib 440 and the cavity 110 can be fixedly connected by, but not limited to, integral molding bonding, welding, threaded connection, screw fastening, snap connection, crimping, plug-in connection, sleeve connection, interference fit, and the like.

[0059] In this embodiment, any of the coupling ribs, including the first coupling rib 410, the second coupling rib 420, the third coupling rib 430, and the fourth coupling rib 440, can extend in a straight line, in a curved shape, or in a similar manner. This embodiment does not impose any particular limitation on the extension path of the coupling ribs. The coupling ribs can be directly connected to two adjacent resonators 200 along the transmission path, i.e., the opposite ends of the coupling ribs are in direct contact with the two adjacent resonators 200. Alternatively, the coupling ribs can be connected to the inner wall of the cavity 110 between the two adjacent resonators 200, with the opposite ends of the coupling ribs not in direct contact with the two adjacent resonators 200, and the coupling ribs are coupled to the resonators 200. Alternatively, the coupling ribs can be directly connected to the two adjacent resonators 200 and also connected to the inner wall of the cavity 110 between the two adjacent resonators 200. The coupling ribs can be metal or made of a non-metallic substrate, such as plastic or ceramic, with a metal layer covering the non-metallic substrate.

[0060] In one embodiment, the combination Figure 4 and Figure 5The capacitive flying rod structure 300 includes an insulating base 310 and a coupling flying rod 320. The insulating base 310 is mounted in the first isolation window 121. The coupling flying rod 320 is inserted into the insulating base 310. The ends of the coupling flying rod 320 extend toward the second resonator 202 and the fifth resonator 205, respectively, and are spaced apart. The insulating base 310 is used to provide insulation between the coupling flying rod 320 and the cavity 110. The coupling flying rod 320 achieves capacitive coupling between the second resonator 202 and the fifth resonator 205, thereby increasing the capacitive coupling strength between the two and facilitating adjustment of the transmission zero over a wider frequency range.

[0061] It can be understood that in other embodiments, the capacitive flying rod structure 300 may not include the insulating card seat 310, and the coupling flying rod 320 may be directly assembled in the coupling window. The portion of the coupling flying rod 320 that is used to contact the side wall of the coupling window is provided with an insulating layer, and / or the portion of the side wall of the coupling window that is used to contact the coupling flying rod 320 is provided with an insulating layer, thereby achieving insulating contact between the coupling flying rod 320 and the cavity 110.

[0062] In this embodiment, the coupling rod 320 is made of conductive material.

[0063] In one embodiment, the combination Figure 4 and Figure 5 The connecting line of the first resonator 201, the second resonator 202, and the third resonator 203 is substantially parallel to the isolation wall 120, that is, the intervals between the first resonator 201, the second resonator 202, and the third resonator 203 and the isolation wall 120 are substantially equal, so that the first resonator 201, the second resonator 202, and the third resonator 203 are arranged in an orderly manner in the cavity 110, and the isolation intervals between the three and the isolation wall 120 can be minimized as much as possible, which is conducive to the miniaturization design of the cavity 110.

[0064] In one embodiment, the combination Figure 4 and Figure 5 The connecting line of the fourth resonator 204, the fifth resonator 205 and the sixth resonator 206 is substantially parallel to the isolation wall 120, that is, the intervals between the fourth resonator 204, the fifth resonator 205 and the sixth resonator 206 and the isolation wall 120 are substantially equal, so that the fourth resonator 204, the fifth resonator 205 and the sixth resonator 206 are arranged in an orderly manner in the cavity 110, and the isolation intervals between the three and the isolation wall 120 can be minimized as much as possible, which is conducive to the miniaturization design of the cavity 110.

[0065] In one embodiment, the combination Figure 4The connection line between the second resonator 202 and the fifth resonator 205 is perpendicular to the isolation wall 120, avoiding random coupling and signal crosstalk between the second resonator 202 and the fifth resonator 205. The two can only achieve cross-capacitive coupling through the capacitive flying rod structure 300, preventing other factors from affecting the coupling strength between the two, so that the coupling strength between the two can be uniquely regulated by the capacitive flying rod structure 300.

[0066] Optionally, the second resonator 202 and the fifth resonator 205 are symmetrically distributed about the isolation wall 120, that is, the second resonator 202 and the fifth resonator 205 are spaced the same distance from the isolation wall 120, so that the second resonator 202 and the fifth resonator 205 are arranged in order in the cavity 110, and the isolation distance between the second resonator 202 and the isolation wall 120 can be minimized as much as possible, which is conducive to the miniaturization design of the cavity 110.

[0067] Similarly, a line connecting the first resonator 201 and the fourth resonator 204 is perpendicular to the partition wall 120 , and a line connecting the third resonator 203 and the sixth resonator 206 is perpendicular to the partition wall 120 .

[0068] In one embodiment, the combination Figure 4 and Figure 5 The filter further includes an input terminal 450 and a first output terminal 460. The first resonator 201 is electrically connected to the input terminal 450, and the sixth resonator 206 is electrically connected to the first output terminal 460. Based on this, the filter can input signals and energy into the first resonator 201 connected thereto through the input terminal 450. The energy is then sequentially transmitted along at least three transmission paths formed by each resonator 200, gradually filtering out and suppressing clutter and interference signals. The signal and energy are then output through the first output terminal 460, completing the filter's filtering operation.

[0069] Specifically, the input terminal 450 can transmit the RF signal to the first resonator 201 through a signal transmission structure such as a connecting rod, a tap line, a tap plate, or a low-pass filter. It is understood that in other embodiments, the first resonator 200 can be directly electrically connected to the input terminal 450. For example, the first resonator 200 is provided with a coupling hole for inserting the input terminal 450, which can facilitate direct, stable, and reliable coupling connection between the input terminal 450 and the first resonator 200. The coupling path between the input terminal 450 and the first resonator 200 is small, thereby effectively reducing the signal delay value between the input terminal 450 and the first resonator 200, effectively enhancing the coupling strength between the input terminal 450 and the first resonator 200, effectively expanding the bandwidth of the filter, and effectively improving the performance indicators of the filter. Moreover, since the input terminal 450 is directly passed through the coupling hole to achieve coupling connection with the first resonator 200, the filter provided in this embodiment can eliminate signal transmission structures such as connecting rods, tap lines, tap sheets, and low-pass filters, thereby reducing the types of materials, simplifying the structure, and helping to reduce material costs.

[0070] Specifically, the sixth resonator 206 can transmit the RF signal to the first output terminal 460 via a signal transmission structure such as a connecting rod, a tapped line, a tapped plate, or a low-pass filter. It is understood that in other embodiments, the sixth resonator 206 can be directly electrically connected to the first output terminal 460. For example, the sixth resonator 206 is provided with a coupling hole for inserting the first output terminal 460, which facilitates direct, stable, and reliable coupling between the first output terminal 460 and the sixth resonator 206. Furthermore, the coupling path between the first output terminal 460 and the sixth resonator 206 is relatively small, thereby effectively reducing the signal delay between the first output terminal 460 and the sixth resonator 206, effectively enhancing the coupling strength between the first output terminal 460 and the sixth resonator 206, effectively expanding the bandwidth of the filter, and effectively improving the performance indicators of the filter. Furthermore, since the first output terminal 460 is directly passed through the coupling hole to achieve coupling connection with the sixth resonator 206, the filter provided in this embodiment can eliminate signal transmission structures such as connecting rods, tap lines, tap plates, and low-pass filters, thereby reducing the number of materials, simplifying the structure, and reducing material costs.

[0071] In this embodiment, the plurality of resonators 200 includes only six resonators 200. The first resonator 201 is used to receive radio frequency signals from outside the cavity 110, and the sixth resonator 206 is used to output the filtered radio frequency signals to the outside. Optionally, the six resonators 200 have the same structure to reduce the number of filter components, simplify the internal structure of the cavity 110, and facilitate the design of the internal space of the cavity 110.

[0072] It will be appreciated that in other embodiments, the multiple resonators 200 may further include other resonators 200. The first resonator 201 may be the first resonator 200, directly receiving an external RF signal, or it may not be the first resonator 200, but instead receive RF signals transmitted from other resonators 200. The first resonator 201 and the second resonator 202 may directly transmit signals, or other resonators 200 may be arranged between them. The second resonator 202 and the third resonator 203 may directly transmit signals, or other resonators 200 may be arranged between them. The fourth resonator 204 and the fifth resonator 205 may directly transmit signals, or other resonators 200 may be arranged between them. The fifth resonator 205 and the sixth resonator 206 may directly transmit signals, or other resonators 200 may be arranged between them. The sixth resonator 206 may be the last resonator 200, directly outputting an RF signal to the outside of the filter, or it may not be the last resonator 200, but instead transmits an RF signal to another resonator 200.

[0073] In some embodiments, combined Figure 4 The plurality of resonators 200 further includes a seventh resonator 207, which is disposed between the first resonator 201 and the input terminal 450 and electrically connected to the first resonator 201 and the input terminal 450. The addition of the seventh resonator 207 enables more precise frequency selection and enhances passband low-sideband suppression.

[0074] Optionally, the seventh resonator 207 and the first resonator 201 are connected via a coupling rib.

[0075] In one embodiment, the combination Figure 4 The filter further includes a second output terminal 470. The plurality of resonators 200 further includes an eighth resonator 208, which is electrically connected to the input terminal 450 and the second output terminal 470, respectively. The addition of the eighth resonator 208 facilitates increasing the transmission path of the RF signal, achieving a one-input, two-output filter, and meeting the use requirements of multiple outputs.

[0076] Combine Figure 6 , see curve C, the first output terminal 460 is used to output a specific frequency band to allow the specific frequency to pass; see curve D, the second output terminal 470 is used to output a frequency band that does not contain the specific frequency band, so that the specific frequency does not pass.

[0077] Specifically, the eighth resonator 208 is located on a side of the first resonator 201 away from the isolation wall 120 , so as to prevent the branch where the eighth resonator 208 is located from interfering with signals of other branches, thereby improving the reliability and stability of signal transmission.

[0078] Optionally, the eighth resonator 208 is electrically connected to the input terminal 450 through the seventh resonator 207. The seventh resonator 207 implements stable branching of the input signal, transmitting the radio frequency signal to the first resonator 201 and the eighth resonator 208 respectively.

[0079] In one embodiment, the combination Figure 3 and Figure 4 Cavity 110 is provided with a first isolation slot 111, located between first resonator 201 and eighth resonator 208, thereby isolating the two signals corresponding to the two output terminals. The first resonator 201 and the eighth resonator 208 are separated by the opposing side walls of first isolation slot 111 and the air gap between them, providing a better isolation effect than that provided by isolation wall 120.

[0080] Specifically, the first isolation trench 111 penetrates the cavity 110 along the thickness direction of the cavity 110 , further improving the isolation between the two signals and simplifying the processing technology of the cavity 110 .

[0081] Specifically, the first isolation trench 111 passes through one end of the cavity 110 along the length direction X, extending the length of the first isolation trench 111 to further improve the isolation between the two signals and simplify the processing of the cavity 110 .

[0082] It is understandable that in other embodiments, the cavity 110 may not be provided with the first isolation groove 111 , but an isolation wall 120 may be provided inside to achieve isolation of the two signals.

[0083] In one embodiment, the combination Figure 3 and Figure 4 The cavity 110 is provided with a second isolation slot 112, and the second isolation slot 112 is located between the seventh resonator 207 and the fourth resonator 204, thereby achieving isolation between the seventh resonator 207 and the fourth resonator 204, avoiding parasitic coupling between the two, so that the radio frequency signal is transmitted according to the preset transmission path.

[0084] Optionally, the second isolation trench 112 extends through the cavity 110 along its thickness, further improving the isolation between the seventh resonator 207 and the fourth resonator 204 and simplifying the processing of the cavity 110. Optionally, the first isolation trench 111 extends through one end of the cavity 110 along its width, further simplifying the processing of the cavity 110. It will be appreciated that in other embodiments, the cavity 110 may not be provided with the second isolation trench 112, but instead an isolation wall 120 may be provided internally to achieve isolation between the seventh resonator 207 and the fourth resonator 204.

[0085] In one embodiment, the combination Figure 4The plurality of resonators 200 further includes a ninth resonator 209 and a tenth resonator 210. The ninth resonator 209 and the tenth resonator 210 are located between the eighth resonator 208 and the second output terminal 470. The eighth resonator 208, the ninth resonator 209, the tenth resonator 210, and the second output terminal 470 are electrically connected in sequence. The addition of the ninth resonator 209 and the tenth resonator 210 enables more precise frequency selection and enhanced passband low-sideband suppression.

[0086] Optionally, the multiple resonators 200 further include an eleventh resonator 211, which is located between the tenth resonator 210 and the second output terminal 470. The eleventh resonator 211 is electrically connected to the tenth resonator 210 and the second output terminal 470, respectively, to achieve more accurate frequency selection and enhance passband low sideband suppression.

[0087] It should be noted that the coupling between any two adjacent resonators among the eighth resonator 208 , the ninth resonator 209 , the tenth resonator 210 and the eleventh resonator 211 may be achieved through coupling ribs, or coupling ribs may not be provided, which is not limited here.

[0088] Optionally, all resonators 200 in the filter have the same structure. In this embodiment, the resonators 200 can be independently of each other in a rod-shaped structure, a cylindrical structure, or a sheet-shaped structure.

[0089] It should be noted that the positions of the input terminal 450 and the first output terminal 460 can be arbitrary and are not limited.

[0090] In one embodiment, the combination Figure 3 and Figure 4 The RF signal flows from input terminal 450 into cavity 110 and then flows out of cavity 110 through first output terminal 460. Input terminal 450 and first output terminal 460 are located at opposite ends of cavity 110, resulting in a short and regular transmission path, which facilitates a more regular and concise arrangement within cavity 110. Specifically, second output terminal 470 and first output terminal 460 are located at the same end of cavity 110. The RF signals corresponding to first output terminal 460 and second output terminal 470 are transmitted approximately in parallel, resulting in a regular transmission path, which facilitates a more regular and concise arrangement within cavity 110.

[0091] In this embodiment, the cavity 110 realizes a shielding function to prevent signal leakage.

[0092] Specifically, combined Figure 3 and Figure 4A tuning structure 480 is provided at the top of cavity 110. This structure is located on top of resonator 200, between two adjacent resonators 200 along the transmission path, or on top of a coupling rib, thereby adjusting the signal coupling strength. Tuning structure 480 can be a force-deformable tuning portion or a tuning screw threaded through the top of cavity 110.

[0093] Optionally, the tuning portion can be deformed by force to adjust the distance between the tuning portion and the inner bottom wall of the cavity 110, thereby adjusting the capacitance between the tuning portion and the resonator 200 or between the tuning portion and the coupling ribs, and adjusting the resonant frequency. Thus, the tuning convenience and tuning accuracy of the filter can be effectively guaranteed and improved. Moreover, since the filter is adjusted by the deformation of the tuning portion, it is possible to substantially avoid the situation where the tuning screw goes too deep into the cavity of the cavity 110 or even rubs against the cavity 110, thereby effectively reducing the risk of high-power discharge and arcing phenomena in the filter, and substantially no burrs, debris, etc. will fall into the interior of the cavity 110 during tuning, thereby effectively guaranteeing and improving the intermodulation stability and power index of the filter. Furthermore, the filter can also omit tuning elements such as tuning screws relative to existing filters, thereby simplifying the structure, saving costs, and facilitating miniaturization and lightweighting of the filter.

[0094] Optionally, the cavity 110 includes threaded holes. Each threaded hole is provided corresponding to a resonator 200, or the threaded holes are located between two adjacent resonators 200. The tuning structure 480 is a tuning screw threadedly connected to the threaded hole. Based on this, the length of the tuning screw inserted into the cavity 110 can be adjusted by rotating the tuning screw relative to the cavity 110, thereby adjusting the resonant frequency. Adjustment is also very convenient.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filter, characterized in that: The filter includes a cavity, a capacitive flying rod structure, and a plurality of resonators installed in the cavity, wherein the cavity is provided with an isolation wall having a first coupling window, and the plurality of resonators include a first resonator, a second resonator, and a third resonator located on one side of the isolation wall and electrically connected in sequence along the length direction of the isolation wall, and the plurality of resonators also include a fourth resonator, a fifth resonator, and a sixth resonator located on the other side of the isolation wall and electrically connected in sequence along the length direction of the isolation wall, the first resonator and the fourth resonator are electrically connected through a first coupling rib provided in the cavity, the third resonator and the sixth resonator are electrically connected through a second coupling rib provided in the cavity, and the capacitive flying rod structure is provided in the first coupling window and is located between the second resonator and the fifth resonator.

2. The filter according to claim 1, wherein: The first coupling rib is located at a first end of the isolation wall, and two ends of the first coupling rib are in contact and conduction with the first resonator and the fourth resonator respectively; And / or, the second coupling rib is located at the second end of the isolation wall, and two ends of the second coupling rib are in contact with and conductive with the third resonator and the sixth resonator respectively.

3. The filter according to claim 1, wherein: The first coupling rib is integrally formed with the cavity; And / or, the second coupling rib is integrally formed with the cavity.

4. The filter according to claim 1, wherein: The filter further includes a third coupling rib, wherein the third coupling rib is arranged between the first resonator and the second resonator, and / or the third coupling rib is arranged between the second resonator and the third resonator.

5. The filter according to claim 1, wherein: The filter further includes a fourth coupling rib, wherein the fourth coupling rib is arranged between the first resonator and the second resonator, and / or the fourth coupling rib is arranged between the second resonator and the third resonator.

6. The filter according to claim 1, wherein: The capacitive flying rod structure includes an insulating card seat and a coupling flying rod. The insulating card seat is installed in the first coupling window. The coupling flying rod is inserted into the insulating card seat. Two ends of the coupling flying rod extend toward the second resonator and the fifth resonator respectively and are arranged at intervals.

7. The filter according to any one of claims 1 to 6, characterized in that: The filter further includes an input terminal and a first output terminal, the first resonator is electrically connected to the input terminal, and the sixth resonator is electrically connected to the first output terminal.

8. The filter according to claim 7, wherein: The plurality of resonators further include a seventh resonator, which is disposed between the first resonator and the input terminal and is electrically connected to the first resonator and the input terminal, respectively.

9. The filter according to claim 7, wherein: The filter further includes a second output terminal. The plurality of resonators further include an eighth resonator. The eighth resonator is electrically connected to the input terminal and the second output terminal, respectively. The eighth resonator is located on a side of the first resonator away from the isolation wall.

10. The filter according to claim 9, characterized in that: The cavity is provided with a first isolation slot, and the first isolation slot is located between the first resonator and the eighth resonator; The plurality of resonators further include a ninth resonator and a tenth resonator, the ninth resonator and the tenth resonator being located between the eighth resonator and the second output terminal, and the eighth resonator, the ninth resonator, the tenth resonator, and the second output terminal being electrically connected in sequence; The input terminal and the first output terminal are located at opposite ends of the cavity, and the second output terminal and the first output terminal are located at the same end of the cavity.

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