Cavity filter and communication equipment

Abstract

The embodiment of the invention provides a cavity filter and communication equipment, and relates to the technical field of filters. The cavity filter comprises a cavity, a cover plate, a first resonator, a second resonator, a coupling rod and a tuning part. The cover plate covers the cavity, the first resonator is arranged in a first resonant cavity in the cavity, the second resonator is arranged in a second resonant cavity in the cavity, a partition wall is arranged between the first resonant cavity and the second resonant cavity, and a coupling window is arranged between the partition wall and the cover plate. The coupling rod is arranged in the coupling window in a penetrating mode, and the first resonator and the second resonator form capacitive coupling through the coupling rod. The cover plate is provided with a tuning hole at the coupling window, the tuning member passes through the tuning hole, and the projection of the coupling rod along the axial direction of the tuning hole does not intersect with the projection of the tuning member along the axial direction of the tuning hole. The first resonator is connected with the coupling rod, and the first resonator is used for limiting the movement of the coupling rod. In this way, the tuning range of the tuning piece arranged at the coupling window is large.

Description

Technical Field

[0001] This application relates to the field of filter technology, and in particular to a cavity filter and communication device. Background Technology

[0002] Filters are commonly found in communication equipment such as base stations. A filter is a frequency selective device used to select communication signals and filter interference signals. Cavity filters are a type of filter that have advantages such as low insertion loss, large power capacity, good heat dissipation, and high Q value, and can meet the needs of high-power transmission.

[0003] In related technologies, a cavity filter may include a cavity, a cover plate, resonators, coupling rods, and a tuning element. The cover plate is attached to the cavity, which contains multiple resonant cavities. Each resonant cavity can contain one resonator. A partition wall is provided between the resonant cavities containing two resonators that form capacitive coupling. A coupling window is provided between the end of the partition wall facing the cover plate and the cover plate. The coupling rod passes through the coupling window. The resonators on both sides of the partition wall form capacitive coupling through the coupling rod. To ensure that the heavier coupling rod can be installed more stably in the coupling window, an insulating bracket can be snapped into the coupling window. The insulating bracket snapped into the coupling window can clamp and fix the coupling rod. The cover plate has a tuning hole at the coupling window. The tuning element is inserted into the tuning hole in a way that allows it to move axially along the tuning hole. The tuning element can change the equivalent capacitance between the resonators on both sides of the partition wall by changing the length of the part inserted into the cavity, thereby changing the strength of the capacitive coupling formed between the resonators on both sides of the partition wall, and thus tuning the cavity filter.

[0004] However, in cavity filters of related technologies, the tuning range of the tuning element set at the coupling window is relatively narrow.

[0005] Therefore, how to increase the tuning range of the tuning element set at the coupling window has become an urgent problem to be solved in the field of cavity filter design. Summary of the Invention

[0006] This application provides a cavity filter and a communication device, which allows the tuning element disposed at the coupling window to have a large stroke, thereby increasing the tuning range of the tuning element disposed at the coupling window.

[0007] A first aspect of this application provides a cavity filter, comprising a cavity, a cover plate, a first resonator, a second resonator, a coupling rod, and a tuning element. The cavity has a mounting opening on one side in a first direction, communicating with the inner cavity of the cavity. The cover plate is fitted onto the cavity, sealing the mounting opening. The cavity contains a first resonant cavity and a second resonant cavity arranged along a second direction. The first resonator is disposed in the first resonant cavity, and the second resonator is disposed in the second resonant cavity. A partition wall exists between the first and second resonant cavities, and a coupling window is formed between the end of the partition wall facing the cover plate and the cover plate. The coupling rod passes through the coupling window, and the first resonator and the second resonator form capacitive coupling through the coupling rod. The cover plate has a tuning hole at the coupling window, and the tuning element is disposed within the tuning hole in a manner that allows it to move along the first direction. The projection of the coupling rod along the first direction does not intersect with the projection of the tuning element along the first direction. The first resonator is connected to the coupling rod and is used to limit the movement of the coupling rod. The first direction is the height direction of the cavity filter, and the second direction is perpendicular to the first direction.

[0008] The cavity filter provided in this application embodiment reduces the strength requirement for the connection between the coupling rod and the cavity within the coupling window by connecting the coupling rod to the first resonator. It can even eliminate the connection between the coupling rod and the cavity within the coupling window, thereby reducing the structural requirements for this portion of the coupling rod and facilitating its avoidance of the tuning element. With reduced structural requirements for the coupling rod within the coupling window, the projection of the coupling rod along the first direction does not intersect with the projection of the tuning element along the first direction. This prevents the coupling rod from obstructing the movement of the tuning element along the first direction, increasing the travel distance of the tuning element and thus expanding its tuning range. In this way, a wider tuning range can be achieved while maintaining a strong capacitive coupling between the first and second resonators and a stable connection between the coupling rod and the cavity.

[0009] In one possible implementation, the cavity filter further includes an insulated connector. The connector is disposed within the coupling window and is fixedly connected to the partition wall. The outer peripheral wall of the connector has a first annular groove extending circumferentially along the connector. The coupling rod includes a first annular portion that is engaged within the first annular groove. One end of the connector facing the cover plate has a clearance hole, and the projection of the tuning element along a first direction lies within the projection of the clearance hole along the first direction.

[0010] This reduces the requirements for the connection between the coupling rod and the first resonator, allowing for more flexible connections. Furthermore, it ensures a more stable fixation between the coupling rod and the cavity, resulting in a more stable capacitive coupling between the first resonator and the second resonator via the coupling rod. Additionally, the tuning element can move along the first direction into the clearance hole, allowing for a wider tuning range after the coupling rod connects to the cavity within the coupling window via the connecting seat. Moreover, the connecting seat connects to the first annular portion of the coupling rod via a first annular groove on its outer peripheral wall. This allows for convenient connection between the coupling rod and the connecting seat, and provides good stability after connection, while also preventing electrical contact between the coupling rod and the partition wall.

[0011] In one possible implementation, the connecting seat includes a support ring and a limiting member. The limiting member includes a connecting post and a limiting ring. Both ends of the connecting post extend along a first direction. The end of the connecting post away from the cover plate is fixedly connected to a partition wall. The limiting ring is fixedly connected to the outer peripheral wall of the connecting post. The support ring is sleeved on the connecting post, located between the limiting ring and the partition wall. A first annular groove is formed between the support ring and the limiting ring. A first annular portion is sleeved on the connecting post, overlapping between the support ring and the limiting ring. The limiting ring presses the first annular portion and the support ring against the partition wall. The end of the connecting post facing the cover plate has a clearance hole.

[0012] Therefore, it is more convenient to fit the first annular part into the first annular slot.

[0013] In one possible implementation, the clearance hole is a blind hole, and the end of the connecting post away from the cover plate is fixedly connected to the partition wall by fasteners that pass through the bottom of the clearance hole and the partition wall.

[0014] In this way, the connection between the connecting column and the partition wall is more convenient, making it easier for the limiting ring to press the first annular part and the support ring onto the partition wall.

[0015] In one possible implementation, the end of the connecting post furthest from the cover plate is detachably connected to the partition wall.

[0016] Thus, support rings and limiting members of different sizes in the first direction can be replaced as needed to adjust the position of the first coupling rod in the first direction, thereby adjusting the coupling strength between the first resonator and the second resonator.

[0017] In one possible implementation, the connecting seat is a cylindrical structure, and the first annular portion is an annular structure.

[0018] This makes it easier to open a large circular clearance hole on the connector, which facilitates clearance of the first tuning component.

[0019] In one possible implementation, the coupling rod includes a second annular portion, which is a circular ring structure. The second annular portion is located inside the first resonant cavity and is sleeved on the outside of the first resonator, forming a capacitive coupling with the first resonator.

[0020] In this way, the capacitive coupling between the coupling rod and the first resonator can be strengthened, which in turn can strengthen the capacitive coupling between the first resonator and the second resonator.

[0021] In one possible implementation, a plurality of insulating abutment members are provided between the outer peripheral wall of the first resonator and the inner peripheral wall of the second annular portion, and the plurality of insulating abutment members are distributed at intervals along the circumference of the second annular portion. One end of the insulating abutment member in the radial direction of the second annular portion abuts against the outer peripheral wall of the first resonator, and the other end of the insulating abutment member in the radial direction of the second annular portion abuts against the inner peripheral wall of the second annular portion.

[0022] This facilitates the connection between the coupling rod and the first resonator, thereby restricting the movement of the coupling rod, and makes it relatively easy to assemble and disassemble the coupling rod from the first resonator. Furthermore, it allows for greater flexibility in the arrangement of the coupling rod in the first direction, making it easier to adjust the coupling rod to a position with suitable coupling strength.

[0023] In one possible implementation, the insulating contact member includes an abutment portion and a claw portion. The abutment portion is engaged with the second annular portion via the claw portion. The abutment portion is disposed between the second annular portion and the first resonator. One radial end of the abutment portion abuts against the outer peripheral wall of the first resonator, and the other radial end of the abutment portion abuts against the inner periphery of the second annular portion.

[0024] Thus, the insulating abutment is set more securely between the second annular portion and the first resonator, and is not easy to fall off between the second annular portion and the first resonator, which facilitates a more stable connection between the coupling rod and the first resonator.

[0025] In one possible implementation, the second annular portion has a snap-fit ​​notch on its side in the first direction that corresponds to the snap-fit ​​portion. The snap-fit ​​notch penetrates the second annular portion radially, and the snap-fit ​​portion is engaged in the corresponding snap-fit ​​notch.

[0026] In this way, the engagement between the insulating abutment and the second annular portion is relatively stable, and problems such as connection failure between the second annular portion and the first resonator are less likely to occur due to the insulating abutment moving along the circumference of the second annular portion.

[0027] In one possible implementation, the first resonator includes a rod and an outwardly flared structure disposed at one end of the rod. Both ends of the rod extend along a first direction, and the outwardly flared structure is located at the end of the rod facing the cover plate. A second annular portion is sleeved on the outside of the rod, and the second annular portion is spaced apart on the side of the outwardly flared structure away from the cover plate. The second annular portion is connected to the outwardly flared structure by a plurality of insulating connectors passing through the second annular portion and the outwardly flared structure, the plurality of insulating connectors being spaced apart circumferentially along the second annular portion.

[0028] In this way, the connection between the second annular part and the first resonator is relatively stable, and the part of the coupling rod inside the coupling window does not need to be connected to the cavity to achieve a relatively stable connection between the coupling rod and the cavity.

[0029] In one possible implementation, the insulating connector is interference-fitted with the second annular portion and the outward-facing structure.

[0030] This facilitates a stable connection between the second ring-shaped part and the first outward-turning structure.

[0031] In one possible implementation, the outer peripheral wall of the insulating connector has a second annular groove and a third annular groove, both of which surround the insulating connector circumferentially, and are spaced apart in a first direction. A second annular portion is engaged within the second annular groove, with the bottom of the second annular groove having an interference fit with the second annular portion. An outwardly flared structure is engaged within the third annular groove, with the bottom of the third annular groove having an interference fit with the outwardly flared structure. The insulating connector includes a first frustum segment located between the end of the insulating connector away from the cover plate and the second annular groove, the outer diameter of the first frustum segment gradually increasing from the end away from the cover plate to the end facing the cover plate, and the end of the first frustum segment facing the cover plate extending to the second annular groove. The insulating connector also includes a second frustum segment located between the second annular groove and the third annular groove. The outer diameter of the second frustum segment gradually increases from the end away from the cover plate to the end facing the cover plate. The end of the second frustum segment facing the cover plate extends to the third annular groove. The projection of the portion of the insulating connector between the end away from the cover plate and the second frustum segment along the first direction is located within the projection of the end of the second frustum segment away from the cover plate along the first direction.

[0032] Thus, the assembly of the insulating connector with the second annular portion and the outward-facing structure, as well as the achievement of an interference fit, are relatively easy. Furthermore, the second and third annular slots can respectively restrict the movement of the second annular portion and the outward-facing structure in the first direction, making the connection between the second annular portion and the outward-facing structure more secure.

[0033] In one possible implementation, the first resonator is welded to the coupling rod, the first resonator is electrically connected to the coupling rod, and the coupling rod forms a capacitive coupling with the second resonator.

[0034] Thus, the connection between the first resonator and the coupling rod is relatively easy, the connection structure is simple, it occupies little space, and it is convenient for the arrangement of the cavity filter components.

[0035] In one possible implementation, the second resonator is connected to the coupling rod, and the second resonator is used to limit the movement of the coupling rod.

[0036] Thus, by connecting the coupling rod to both the first resonator and the second resonant cavity, the strength requirement for the connection between the portion of the coupling rod within the coupling window and the cavity is lower; it can even be achieved by not connecting the portion of the coupling rod within the coupling window to the cavity, facilitating the avoidance of the coupling rod from the tuning element. Furthermore, it also allows for better stability in the connection between the coupling rod and the cavity, resulting in a more stable capacitive coupling between the first resonator and the second resonator via the coupling rod.

[0037] In one possible implementation, the coupling rod includes a third annular portion, which is a circular ring structure. The third annular portion is located inside the second resonant cavity and is sleeved on the outside of the second resonator, forming a capacitive coupling with the second resonator.

[0038] In this way, the capacitive coupling between the coupling rod and the second resonator can be strengthened, which in turn can strengthen the capacitive coupling between the first resonator and the second resonator.

[0039] In one possible implementation, the third annular portion is a non-closed circular ring structure.

[0040] Thus, the notch in the third annular portion can be used to avoid other components, facilitating the arrangement of components in the cavity filter. Furthermore, the circumferential length of the third annular portion can be adjusted according to the required strength of the capacitive coupling formed between the first and second resonators, making it easier to adjust the strength of the capacitive coupling between the first and second resonators to a suitable range.

[0041] A second aspect of this application provides a communication device that includes the cavity filter described in any of the above embodiments. Attached Figure Description

[0042] Figure 1 A schematic diagram of a communication device provided in an embodiment of this application;

[0043] Figure 2 A schematic diagram illustrating the connection between a radio frequency system and an antenna feeder system provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the topology of a cavity filter provided in an embodiment of this application;

[0045] Figure 4A schematic diagram of dual-cavity coupling of a cavity filter provided in an embodiment of this application;

[0046] Figure 5 A cross-sectional schematic diagram of a cavity filter with dual-cavity coupling is provided in an embodiment of this application;

[0047] Figure 6 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0048] Figure 7 A cross-sectional schematic diagram of a dual-cavity coupling cavity filter provided in an embodiment of this application;

[0049] Figure 8 A schematic diagram of a first coupling rod provided in an embodiment of this application;

[0050] Figure 9 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0051] Figure 10 A schematic diagram of a first insulating contact member provided in an embodiment of this application;

[0052] Figure 11 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0053] Figure 12 A schematic diagram of yet another first coupling rod provided in an embodiment of this application;

[0054] Figure 13 A schematic diagram of yet another first insulating contact member provided in an embodiment of this application;

[0055] Figure 14 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0056] Figure 15 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0057] Figure 16 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0058] Figure 17 A schematic diagram of a first insulating connector provided in an embodiment of this application;

[0059] Figure 18 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0060] Figure 19A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0061] Figure 20 A schematic diagram of yet another first coupling rod provided in an embodiment of this application;

[0062] Figure 21 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0063] Figure 22 A schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application;

[0064] Figure 23 A schematic diagram of another cavity filter multi-cavity coupling provided in an embodiment of this application;

[0065] Figure 24 This is a schematic diagram of another cavity filter multi-cavity coupling provided in an embodiment of this application.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Modulator; 2. Up-converter; 3. Power amplifier; 4. First oscillator; 5. Second oscillator; 6. Filter; 7. Low-noise amplifier; 8. Down-converter; 9. Demodulator; 10. Third oscillator; 11. Fourth oscillator;

[0068] 21. Transmission system; 22. Baseband system; 23. Radio frequency system; 24. Antenna and feeder system; 25. Control system; 26. Power supply system;

[0069] 100, cavity; 110, first partition wall; 120, first coupling window; 130, input terminal; 140, output terminal; 150, resonant cavity; 150a, first resonant cavity; 151a, first resonant pillar; 150b, second resonant cavity; 151b, second resonant pillar; 160, second partition wall;

[0070] 200, cover plate; 210, first tuning nut; 220, first tuning element; 230, second tuning nut; 240, second tuning element;

[0071] 300. Resonator;

[0072] 300a, First resonator; 310a, First rod; 320a, First outward-facing structure; 321a, First clearance notch;

[0073] 300b, second resonator; 310b, second rod; 320b, second outward-facing structure; 321b, second clearance notch;

[0074] 300c, third resonator;

[0075] 400. First coupling rod;

[0076] 410. First annular portion; 420. Second annular portion; 421. First snap-fit ​​notch; 430. Third annular portion; 431. Second snap-fit ​​notch; 440. First connecting arm portion; 450. Second connecting arm portion;

[0077] 500, Connecting seat; 510, First annular groove; 520, Clearance hole; 530, Support ring; 540, Limiting component; 541, Limiting ring; 542, Connecting post;

[0078] 610. First insulating abutment member; 611. First abutment portion; 612. First claw portion; 6121. First connecting portion; 6122. First claw portion; 620. Second insulating abutment member; 621. Second abutment portion; 622. Second claw portion; 6221. Second connecting portion; 6222. Second claw portion; 630. First insulating connector; 631. Second annular groove; 632. Third annular groove; 633. First frustum segment; 634. Second frustum segment; 640. Second insulating connector;

[0079] 710. First fastener;

[0080] 800, Second coupling rod; 810, Fourth annular portion; 820, Fifth annular portion;

[0081] x, first direction; y, second direction; z, third direction. Detailed Implementation

[0082] The terminology used in the implementation section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. The implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0083] This application provides a communication device, which may include, but is not limited to, a base station, radar, mobile phone, computer, etc.

[0084] The communication equipment provided in this application embodiment can be applied to one or more of the following communication technologies: Global Positioning System (GPS) communication technology, General Packet Radio Service (GPRS) communication technology, Code Division Multiple Access (CDMA) communication technology, Time Division Multiple Access (TDMA) communication technology, Global System for Mobile Communications (GSM) communication technology, Wideband Code Division Multiple Access (WCDMA) communication technology, Long Term Evolution (LTE) communication technology, 5G communication technology, Sub-6G communication technology, and other future communication technologies.

[0085] Figure 1 This is a schematic diagram of a communication device provided in an embodiment of this application.

[0086] like Figure 1 As shown, the communication equipment may include a transmission system 21, a baseband system 22, a radio frequency system 23, an antenna feeder system 24, a control system 25, and a power supply system 26.

[0087] The transmission system 21 is used to complete the data forwarding function within the transmission network and communication equipment, and provides the physical interface between the communication equipment and the transmission network, as well as the user plane interface between the communication equipment and other network elements.

[0088] The baseband system 22 is used to process uplink and downlink baseband signals.

[0089] The radio frequency system 23 is used to perform radio frequency signal transmission and reception processing. It can complete the conversion between baseband signals and radio frequency signals through steps such as modulation or demodulation, frequency conversion, amplification, and filtering.

[0090] The antenna feeder system 24 is used to complete the input and output of air interface signals for communication equipment.

[0091] The control system 25 is responsible for the internal maintenance, debugging, and configuration functions of the communication equipment. It mainly includes signaling processing, configuration management, resource management, execution of operation and maintenance functions, monitoring of the communication equipment's operating status, providing input / output control interfaces for the communication equipment, and providing the operating reference clock for the entire communication equipment.

[0092] The power supply system 26 is used to provide the required voltage for the communication equipment.

[0093] The transmission system 21, baseband system 22, radio frequency system 23 and antenna feed system 24 can be connected in sequence. The control system 25 can be connected to the transmission system 21, baseband system 22, radio frequency system 23 and antenna feed system 24 respectively. The power supply system 26 can be connected to the control system 25.

[0094] Figure 2 This is a schematic diagram illustrating the connection between a radio frequency system and an antenna feeder system, provided as an embodiment of this application.

[0095] like Figure 2 As shown, the radio frequency system 23 may include a modulator 1, an up-converter 2, a power amplifier 3, a filter 6, a low-noise amplifier 7, a down-converter 8, a demodulator 9, a first oscillator 4, a second oscillator 5, a third oscillator 10, and a fourth oscillator 11. The first oscillator 4 is connected to the modulator 1, the modulator 1 and the second oscillator 5 are connected to the up-converter 2, the up-converter 2 is connected to the power amplifier 3, the power amplifier 3 is connected to the filter 6, the filter 6 is connected to the low-noise amplifier 7, the low-noise amplifier 7 and the fourth oscillator 11 are connected to the down-converter 8, the down-converter 8 and the third oscillator 10 are connected to the demodulator 9, the modulator 1 and the demodulator 9 are connected to the baseband system 22, and the filter 6 is connected to the antenna system 24.

[0096] When the communication equipment transmits radio frequency (RF) signals, the baseband signal from the baseband system 22 is modulated, up-converted, amplified, and filtered to become an RF signal that can propagate in free space, and then transmitted to the antenna feeder system 24 for radiation into free space. When the communication equipment receives external RF signals, the RF signals received by the antenna feeder system 24 are filtered, amplified with low noise, down-converted, and demodulated before being transmitted to the baseband system 22 for further processing.

[0097] Filter 6 is a frequency selection device that can be used to select communication signals and filter interference signals, thereby reducing the interference of interference signals on the operation of communication equipment.

[0098] Filter 6 can be a cavity filter, which has advantages such as low insertion loss, large power capacity, good heat dissipation performance and high Q value, and can meet the needs of high power transmission.

[0099] Figure 3 This is a schematic diagram of the topology of a cavity filter provided in an embodiment of this application.

[0100] like Figure 3 As shown, the cavity filter may include an input terminal 130, an output terminal 140, and multiple resonators 300. Figure 3In the diagram, two resonators 300 connected by a solid line indicate magnetic coupling between them, while two resonators 300 connected by a dashed line indicate capacitive coupling. Input terminal 130 is coupled to the first resonator 300 and is used to input the signal into filter 6. Output terminal 140 is coupled to the last resonator 300 and is used to output the signal filtered by filter 6.

[0101] The input terminal 130 can be magnetically coupled to the resonator 300 at the beginning, or it can be capacitively coupled to the resonator 300 at the beginning.

[0102] The output terminal 140 can be magnetically coupled to the resonator 300 at the tail end, or it can be capacitively coupled to the resonator 300 at the tail end.

[0103] Capacitive coupling between two devices means that the capacitive coupling between the two devices is strong and the magnetic coupling is weak, and the coupling between the two devices is mainly capacitive coupling.

[0104] Two devices that form a capacitive coupling have a capacitive structure between them, and the two devices form a capacitive coupling through the capacitive structure.

[0105] Magnetic coupling between two devices means that the magnetic coupling between the two devices is strong and the capacitive coupling is weak, and the coupling between the two devices is mainly magnetic coupling.

[0106] "Multiple" refers to two or more, such as two, three, four, five, or more.

[0107] Two resonators 300 that form capacitive coupling can form a cascaded triplet (CT) structure or a cascaded quadruplet (CQ) structure with other resonators 300. The CT structure and the CQ structure can add zeros outside the passband of the filter 6 so that the filter 6 can better suppress interference signals outside the passband.

[0108] The passband of filter 6 refers to the frequency range that filter 6 allows signals to pass through. Filter 6 can make the signal in the passband of the input resonate, so that the signal in the passband of the input filter 6 can be output with less loss.

[0109] Figure 4 This is a schematic diagram of a dual-cavity coupling cavity filter provided in an embodiment of this application. Figure 5This is a cross-sectional schematic diagram of a dual-cavity coupled cavity filter provided in an embodiment of this application. The x-direction is a first direction, the y-direction is a second direction, and the z-direction is a third direction. The first direction is the height direction of the cavity filter, the second direction is perpendicular to the first direction, the third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction. For example, the cavity filter can be placed horizontally, the first direction can be a vertical direction, and the second and third directions are two different horizontal directions.

[0110] like Figure 4 , Figure 5 As shown in the embodiment of this application, the cavity filter further includes a cavity 100 and a cover plate 200. The cavity 100 has a mounting port on one side in a first direction, communicating with the interior cavity of the cavity 100. The cover plate 200 is fitted onto the cavity 100, sealing the mounting port. The cavity 100 is made of a conductive material such as metal. The cavity 100 has multiple resonant cavities 150 corresponding one-to-one with the multiple resonators 300 of the cavity filter, and each resonant cavity 150 is connected to the mounting port. The resonators 300 are disposed within their respective resonant cavities 150. Both the input terminal 130 and the output terminal 140 can be disposed on the cavity 100.

[0111] For example, the cover plate 200 can be fixedly connected to the cavity 100 by means of snap-fit, fastener connection, welding or other methods.

[0112] For example, the resonator 300 can be fixedly connected to the cavity 100 by means of welding, snap-fitting, fastener connection, etc.

[0113] The cavity filter has multiple resonators 300, including a first resonator 300a and a second resonator 300b. The cavity 100 has multiple resonant cavities 150, including a first resonant cavity 150a and a second resonant cavity 150b. The first resonator 300a is disposed in the first resonant cavity 150a, and the second resonator 300b is disposed in the second resonant cavity 150b. The first resonant cavity 150a and the second resonant cavity 150b can be arranged along a second direction. A first partition wall 110 is provided between the first resonant cavity 150a and the second resonant cavity 150b. A first coupling window 120 is provided between the end of the first partition wall 110 facing the cover plate 200 and the cover plate 200. The first coupling window 120 can be formed by the first partition wall 110 and the cover plate 200.

[0114] The first partition wall 110 is made of conductive materials such as metal, and the first partition wall 110 can be integrated with the cavity 100.

[0115] The cavity filter also includes a first coupling rod 400, which passes through the first coupling window 120. The two ends of the first coupling rod 400 in the length direction are located in the first resonant cavity 150a and the second resonant cavity 150b, respectively. The first resonator 300a forms capacitive coupling with the second resonator 300b through the first coupling rod 400.

[0116] The first coupling rod 400 is made of conductive materials such as metal. Compared with the scheme of forming capacitive coupling between the first resonator 300a and the second resonator 300b through a circuit board with microstrip lines or a coupling plate made of conductive materials, the size of the first coupling rod 400 in the first direction is larger than that of the microstrip line and the coupling plate in the first direction. The area where the first coupling rod 400 couples with the first resonator 300a and the second resonator 300b in the first direction is larger. The coupling strength when the first resonator 300a and the second resonator 300b form capacitive coupling through the first coupling rod 400 is stronger. This makes the strength of the capacitive coupling formed by the first resonator 300a and the second resonator 300b meet the requirements of the cavity filter when a wide passband is needed, which is beneficial to make the passband of the cavity filter have a wide bandwidth.

[0117] The first resonator 300a and the second resonator 300b do not specifically refer to two resonators 300 of the cavity filter. The first resonator 300a and the second resonator 300b can be any two resonators 300 of the cavity filter that form capacitive coupling. The first resonant cavity 150a and the second resonant cavity 150b are the resonant cavities 150 where the first resonator 300a and the second resonator 300b are located, respectively.

[0118] Both ends of the first coupling rod 400 in the length direction can extend along the second direction.

[0119] The cavity filter also includes a first tuning element 220, which is made of a conductive material such as metal. The cover plate 200 has a first tuning hole at the first coupling window 120. The first tuning hole is a through hole, and the first tuning element 220 is inserted into the first tuning hole in a manner that allows it to move along a first direction. The first tuning element 220 can change the equivalent capacitance between the first resonator 300a and the second resonator 300b by changing the length of the portion inserted into the cavity 100, thereby changing the strength of the capacitive coupling formed between the first resonator 300a and the second resonator 300b, and thus tuning the cavity filter.

[0120] In some examples, a coaxial first tuning nut 210 is provided at the first tuning hole. The first tuning nut 210 is fixedly connected to the cover plate 200. The first tuning member 220 is a threaded connection, for example, a screw. The first tuning member 220 is threadedly connected to the first tuning nut 210. The first tuning member 220 can be moved in the first direction by screwing in or out to change the length of the portion of the first tuning member 220 inserted into the cavity 100.

[0121] In other examples, a first clamping mechanism is provided at the first tuning hole. The first clamping mechanism is connected to the cover plate 200. The first clamping mechanism has a clamping state and a loosening state. When the first clamping mechanism is in the clamping state, the first clamping mechanism clamps and fixes the first tuning member 220 on the cover plate 200. When the first clamping mechanism is in the loosening state, the first tuning member 220 can move along the first direction.

[0122] In related technologies, in order to ensure that the first coupling rod, which is larger in size and heavier in the first direction, can be installed more stably in the first coupling window, an insulating bracket is often snapped into the first coupling window. The insulating bracket snapped into the first coupling window can clamp and fix the first coupling rod.

[0123] However, in related technologies, the first coupling rod is fixedly connected to the cavity through a portion located within the first coupling window. The portions of the first coupling rod located within the first and second resonant cavities are both suspended. To ensure a stable connection between the first coupling rod and the cavity, a large connection surface is required between the insulating card holder and the first coupling rod, resulting in a larger portion of the first coupling rod within the first coupling window. This causes the first coupling rod and the first tuning element to be often positioned opposite each other in the first direction. Consequently, the first coupling rod obstructs the movement of the first tuning element along the first direction. To avoid electrical contact between the first coupling rod and the first tuning element, the first tuning element can often only move along the first direction to a position with a certain distance from the first coupling rod, resulting in a shorter travel distance for the first tuning element in the first direction, which in turn narrows the tuning range of the first tuning element.

[0124] Based on this, such as Figure 5 As shown in the embodiment of this application, the first resonator 300a is connected to the first coupling rod 400. The first resonator 300a is used to restrict the movement of the first coupling rod 400. The projection of the first coupling rod 400 along the first direction does not intersect with the projection of the first tuning element 220 along the first direction.

[0125] In this way, by connecting the first coupling rod 400 to the first resonator 300a, the strength requirement for the connection between the portion of the first coupling rod 400 within the first coupling window 120 and the cavity 100 can be reduced. It is even possible to eliminate the connection between the portion of the first coupling rod 400 within the first coupling window 120 and the cavity 100, thereby reducing the structural requirements on the portion of the first coupling rod 400 within the first coupling window 120 and facilitating the avoidance of the first coupling rod 400 from the first tuning element 220. With the reduced structural requirements on the portion of the first coupling rod 400 within the first coupling window 120, the projection of the first coupling rod 400 along the first direction can be made to not intersect with the projection of the first tuning element 220 along the first direction. This prevents the first coupling rod 400 from obstructing the movement of the first tuning element 220 along the first direction, increasing the travel distance of the first tuning element 220 in the first direction and thus increasing the tuning range of the first tuning element 220. In this way, the capacitive coupling formed between the first resonator 300a and the second resonator 300b has a strong strength, and the first coupling rod 400 is fixed to the cavity 100 relatively stably, so that the first tuning element 220 has a wide tuning range.

[0126] The first resonator 300a does not specifically refer to one of the two resonators 300 that form capacitive coupling. One of the two resonators 300 that form capacitive coupling is the first resonator 300a, and the other is the second resonator 300b.

[0127] The first resonator 300a is used to limit the movement of the first coupling rod 400, meaning that the first resonator 300a limits the movement of the first coupling rod 400 in at least one direction. For example, when the cavity filter is placed horizontally, the first resonator 300a can be used to limit the movement of the first coupling rod 400 in the horizontal direction, that is, the first resonator 300a can be used to limit the movement of the first coupling rod 400 in a direction perpendicular to the first direction.

[0128] The second resonator 300b can be connected to the first coupling rod 400, or it can be not connected to the first coupling rod 400.

[0129] In some examples, the cavity filter may also include a second tuner 240, which is made of a conductive material such as metal. A second tuning hole is provided on the cover plate 200 at a position opposite to the resonator 300 in a first direction. The projection of the second tuning hole along the first direction lies within the projection of the opposite resonator 300 along the first direction. The second tuning hole is a through hole. The second tuner 240 is inserted into the second tuning hole in a manner that allows it to move along the first direction. The second tuner 240 can tune the opposite resonator 300 in the first direction by changing the length of the portion inserted into the cavity 100.

[0130] For example, the second tuning hole and the opposite resonator 300 can be arranged coaxially.

[0131] In some examples, a coaxial second tuning nut 230 is provided at the second tuning hole. The second tuning nut 230 is fixedly connected to the cover plate 200. The second tuning member 240 is a threaded connection, for example, a screw. The second tuning member 240 is threadedly connected to the second tuning nut 230. The second tuning member 240 can be moved in the first direction by screwing in or out to change the length of the portion of the second tuning member 240 inserted into the cavity 100.

[0132] In other examples, a second clamping mechanism is provided at the second tuning hole. The second clamping mechanism is connected to the cover plate 200 and has a clamping state and a loosening state. When the second clamping mechanism is in the clamping state, it clamps and fixes the second tuning member 240 to the cover plate 200. When the second clamping mechanism is in the loosening state, the second tuning member 240 can move along the first direction.

[0133] Figure 6 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0134] like Figure 6 As shown, and see Figure 5 In some possible embodiments, the cavity filter further includes an insulated connector 500, with both ends of the connector 500 extending along a first direction. The connector 500 is disposed within the first coupling window 120 and is fixedly connected to the first partition wall 110. The outer peripheral wall of the connector 500 has a first annular groove 510 extending circumferentially along the connector 500. The first coupling rod 400 includes a first annular portion 410, which is engaged within the first annular groove 510. The end of the connector 500 facing the cover plate 200 has a clearance hole 520, and the projection of the first tuning member 220 along the first direction lies within the projection of the clearance hole 520 along the first direction.

[0135] In this way, the first coupling rod 400 can be connected to the cavity 100 within the first coupling window 120 through the first annular portion 410 and the connecting seat 500, which reduces the requirements for the connection between the first coupling rod 400 and the first resonator 300a, allowing for more flexible connection between them. Furthermore, after the first coupling rod 400 is connected to the cavity 100 within the first coupling window 120 through the first annular portion 410 and the connecting seat 500, the first coupling rod 400 and the cavity 100 are more securely fixed, resulting in a more stable capacitive coupling between the first resonator 300a and the second resonator 300b through the first coupling rod 400. Furthermore, the clearance hole 520 at the end of the connecting seat 500 facing the cover plate 200 can avoid the first tuning element 220. The first tuning element 220 can move into the clearance hole 520 along the first direction. After the first coupling rod 400 is connected to the cavity 100 through the connecting seat 500 in the first coupling window 120, the first tuning element 220 can move a larger stroke along the first direction. This allows the first tuning element 220 to have a larger tuning range after it is connected to the cavity 100 through the connecting seat 500 in the first coupling window 120. Moreover, the first coupling rod 400 is connected to the connecting seat 500 through the first annular portion 410 in the first annular groove 510 on the outer peripheral wall of the connecting seat 500. This makes it easier for the first coupling rod 400 to connect to the connecting seat 500 while avoiding the first tuning element 220, and also ensures good stability after connection. In addition, the first coupling rod 400 is separated from the first partition wall 110 by the connecting seat 500, making it difficult for the first coupling rod 400 to make electrical contact with the first partition wall 110, which helps to keep the first coupling rod 400 and the first partition wall 110 insulated.

[0136] The two side walls of the first annular groove 510 in the first direction can abut against the first annular portion 410, so that the first annular groove 510 can restrict the movement of the first annular portion 410 in the first direction.

[0137] The first annular portion 410 is sleeved on the connecting seat 500, and the connecting seat 500 can abut against the inner circumference of the first annular portion 410, so that the connecting seat 500 can restrict the translation of the first coupling rod 400 in a direction perpendicular to the first direction.

[0138] The first tuning member 220 can be coaxially arranged with the first annular portion 410, and the projection of the first tuning member 220 along the first direction is located within the projection of the inner circumference of the first annular portion 410 along the first direction.

[0139] For example, the connector 500 can be fixedly connected to the first partition wall 110 by means of welding, bonding, snap-fitting, fastener connection, etc.

[0140] For example, the connector 500 can be a columnar structure, a block structure, etc.

[0141] For example, the first annular portion 410 can be a circular ring structure, a square ring structure, etc.

[0142] In some examples, the first annular portion 410 can be a closed annular structure.

[0143] In this way, the stability of the first coupling rod 400 after being connected to the connecting seat 500 through the first annular part 410 is good.

[0144] In other examples, the first annular portion 410 may be a non-closed annular structure, that is, the first annular portion 410 has a notch.

[0145] In this way, the first annular portion 410 can be deformed to enlarge the gap of the first annular portion 410, making it easier to assemble and disassemble the first coupling rod 400 and the connecting seat 500.

[0146] In some examples, the first annular groove 510 can surround the outer periphery of the connector 500 along the circumference of the connector 500, that is, the first annular groove 510 is a closed annular groove.

[0147] In some examples where the first annular portion 410 is a non-closed annular structure, the first annular groove 510 can be a non-closed annular groove, that is, the first annular groove 510 does not surround the outer periphery of the connecting seat 500.

[0148] Figure 7 This is a cross-sectional schematic diagram of another cavity filter with dual-cavity coupling provided in an embodiment of this application.

[0149] like Figure 7 As shown, and see Figure 5 , Figure 6In some possible implementations, the connecting seat 500 includes a support ring 530 and a limiting member 540, which are separate structures. The limiting member 540 includes a connecting post 542 and a limiting ring 541. The two ends of the connecting post 542 extend along a first direction, and the end of the connecting post 542 away from the cover plate 200 is fixedly connected to the first partition wall 110. The limiting ring 541 is fixedly connected to the outer peripheral wall of the connecting post 542. A support ring 530 is sleeved on the connecting post 542, and the support ring 530 is located between the limiting ring 541 and the first partition wall 110. A first annular groove 510 is formed between the support ring 530 and the limiting ring 541. A first annular portion 410 is sleeved on the connecting post 542, and the first annular portion 410 overlaps between the support ring 530 and the limiting ring 541. The limiting ring 541 presses the first annular portion 410 and the support ring 530 onto the first partition wall 110. The end of the connecting post 542 facing the cover plate 200 has a clearance hole 520.

[0150] This makes it easier to fit the first annular portion 410 into the first annular slot 510.

[0151] For example, the end of the connecting column 542 away from the cover plate 200 can be fixedly connected to the first partition wall 110 by means of welding, bonding, snap-fitting, fastener connection, etc.

[0152] For example, the clearance hole 520 is a circular hole to facilitate clearance of the first tuner 220 moving in the first direction.

[0153] For example, the dimension of the support ring 530 in the second direction may be greater than the dimension of the first partition wall 110 in the second direction, the dimension of the first partition wall 110 in the third direction may be greater than the dimension of the support ring 530 in the third direction, and the portion of the support ring 530 projected along the first direction may be located outside the projection of the first partition wall 110 along the first direction.

[0154] In some examples, the clearance hole 520 is a blind hole, and the end of the connecting post 542 away from the cover plate 200 is fixedly connected to the first partition wall 110 through a first fastener 710 passing through the bottom of the clearance hole 520 and the first partition wall 110. Specifically, the bottom of the clearance hole 520 has a first connecting hole, and the end of the first partition wall 110 facing the cover plate 200 has a second connecting hole. The end of the connecting post 542 away from the cover plate 200 is fixedly connected to the first partition wall 110 through a first fastener 710 passing through the first connecting hole and the second connecting hole.

[0155] In this way, it is easier to connect the connecting post 542 to the first partition wall 110, and it is easier for the limiting ring 541 to press the first annular part 410 and the support ring 530 onto the first partition wall 110.

[0156] In some examples, the end of the connecting post 542 away from the cover plate 200 is detachably connected to the first partition wall 110.

[0157] In this way, the support ring 530 and the limiting member 540 of different sizes in the first direction can be replaced as needed to adjust the position of the first coupling rod 400 in the first direction, thereby adjusting the coupling strength between the first resonator 300a and the second resonator 300b.

[0158] For example, the end of the connecting post 542 away from the cover plate 200 can be detachably connected to the first partition wall 110 by means of snap-fit, fastener connection or other means.

[0159] For example, the first fastener 710 can be a threaded fastener, and the first fastener 710 can be threadedly connected to the first partition wall 110.

[0160] In some possible implementations, the connector 500 is a cylindrical structure and the first annular portion 410 is an annular structure.

[0161] This makes it easier to open a large circular clearance hole 520 on the connector 500, which facilitates clearance of the first tuning element 220.

[0162] When the connecting seat 500 is a cylindrical structure, the support ring 530 and the limiting ring 541 are both circular ring structures, and the connecting column 542 is a cylindrical structure.

[0163] The first annular portion 410 can be a closed annular structure or a non-closed annular structure. For example, the first annular portion 410 can be a half-annular structure, a one-third annular structure, a two-thirds annular structure, a one-quarter annular structure, or a three-quarters annular structure, etc.

[0164] In some other possible implementations, the connector 500 may also be an integral structure, and the first annular groove 510 may be formed by slotting the outer peripheral wall of the connector 500.

[0165] like Figure 6 As shown, in some possible implementations, the second resonator 300b is connected to the first coupling rod 400, and the second resonator 300b is used to limit the movement of the first coupling rod 400.

[0166] In this way, by connecting the first coupling rod 400 to both the first resonator 300a and the second resonant cavity 150b, the strength requirement for the connection between the portion of the first coupling rod 400 within the first coupling window 120 and the cavity 100 is lower. It is even possible to omit the connection between the portion of the first coupling rod 400 within the first coupling window 120 and the cavity 100, thereby reducing the structural requirements for this portion and facilitating the avoidance of the first coupling rod 400 from the first tuning element 220. Furthermore, the stability of the connection between the first coupling rod 400 and the cavity 100 is improved, resulting in a more stable capacitive coupling between the first resonator 300a and the second resonator 300b via the first coupling rod 400.

[0167] The second resonator 300b is used to limit the movement of the first coupling rod 400, meaning that the second resonator 300b limits the movement of the first coupling rod 400 in at least one direction. For example, when the cavity filter is placed horizontally, the second resonator 300b can be used to limit the movement of the first coupling rod 400 in the horizontal direction, that is, the second resonator 300b can be used to limit the movement of the first coupling rod 400 in a direction perpendicular to the first direction.

[0168] Figure 8 This is a schematic diagram of a first coupling rod provided in an embodiment of this application.

[0169] like Figure 8 As shown, and refer to Figure 6 In some possible implementations, the first coupling rod 400 includes a second annular portion 420, which is a circular ring structure. The second annular portion 420 is located inside the first resonant cavity 150a and is sleeved on the outside of the first resonator 300a, forming a capacitive coupling with the first resonator 300a.

[0170] In this way, the capacitive coupling between the first coupling rod 400 and the first resonator 300a can be strengthened, which in turn can strengthen the capacitive coupling between the first resonator 300a and the second resonator 300b.

[0171] In some examples, the second annular portion 420 can be a closed circular ring structure.

[0172] This strengthens the capacitive coupling between the first coupling rod 400 and the first resonator 300a. Furthermore, it makes the connection between the first coupling rod 400 and the first resonator 300a more convenient and flexible.

[0173] In other examples, the second annular portion 420 can be a non-closed annular structure, that is, the second annular portion 420 has a notch. For example, the second annular portion 420 can be a half-ring structure, a one-third ring structure, a two-thirds ring structure, a quarter-ring structure, or a three-quarters ring structure, etc.

[0174] The circumferential length of the second annular portion 420 can be determined according to the strength requirements of the capacitive coupling formed between the first coupling rod 400 and the first resonator 300a, as well as the position of the first coupling rod 400 in the first direction.

[0175] When the second annular portion 420 is a non-closed circular structure, the notch in the second annular portion 420 can be used to avoid other devices. For example, the notch in the second annular portion 420 can be used to avoid other coupling rods or connectors used for coupling with the first resonator 300a, thereby facilitating the arrangement of the cavity filter devices. Furthermore, the circumferential length of the second annular portion 420 can be adjusted according to the required strength of the capacitive coupling formed between the first resonator 300a and the second resonator 300b, making it easier to adjust the strength of the capacitive coupling formed between the first resonator 300a and the second resonator 300b to a suitable range.

[0176] In the example where the first coupling rod 400 includes the second annular portion 420, the first coupling rod 400 may also include a first connecting arm portion 440, and the first annular portion 410 may be connected to the second annular portion 420 through the first connecting arm portion 440.

[0177] In some possible implementations, the first coupling rod 400 includes a third annular portion 430, which is a circular ring structure. The third annular portion 430 is located inside the second resonant cavity 150b and is sleeved on the outside of the second resonator 300b, forming a capacitive coupling with the second resonator 300b.

[0178] In this way, the capacitive coupling between the first coupling rod 400 and the second resonator 300b can be strengthened, which in turn can strengthen the capacitive coupling between the first resonator 300a and the second resonator 300b.

[0179] In some examples, the third annular portion 430 can be a closed annular structure.

[0180] This strengthens the capacitive coupling between the first coupling rod 400 and the second resonator 300b. Furthermore, it makes the connection between the first coupling rod 400 and the second resonator 300b more convenient and flexible.

[0181] In the example where the first coupling rod 400 includes a third annular portion 430, the first coupling rod 400 may also include a second connecting arm portion 450, and the first annular portion 410 may be connected to the third annular portion 430 through the second connecting arm portion 450.

[0182] For example, the first annular portion 410, the second annular portion 420, the third annular portion 430, the first connecting arm portion 440 and the second connecting arm portion 450 can be an integral structure.

[0183] In some examples where the first coupling rod 400 forms capacitive coupling with the first resonator 300a through the second annular portion 420 and with the second resonator 300b through the third annular portion 430, the relative bandwidth of the cavity filter can reach 26.4%. Furthermore, zeros can appear in both the high-frequency and low-frequency portions outside the passband to facilitate better suppression of interference signals outside the passband.

[0184] Figure 9 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0185] like Figure 9 As shown, and see Figure 6 In some possible embodiments, a plurality of first insulating abutments 610 are provided between the outer peripheral wall of the first resonator 300a and the inner periphery of the second annular portion 420, and the plurality of first insulating abutments 610 are distributed at intervals along the circumference of the second annular portion 420. One end of the first insulating abutment 610 in the radial direction of the second annular portion 420 abuts against the outer peripheral wall of the first resonator 300a, and the other end of the first insulating abutment 610 in the radial direction of the second annular portion 420 abuts against the inner periphery of the second annular portion 420.

[0186] The outer peripheral wall of the first resonator 300a can be radially pressed against the inner periphery of the second annular portion 420 by a plurality of first insulating abutments 610 arranged circumferentially along the second annular portion 420.

[0187] The first resonator 300a can be connected to the first coupling rod 400 by a plurality of first insulating abutments 610 distributed circumferentially along the second annular portion 420. The first resonator 300a can be used to restrict the movement of the second annular portion 420 in a direction perpendicular to the first direction by the plurality of first insulating abutments 610 distributed circumferentially along the second annular portion 420.

[0188] This facilitates the connection between the first coupling rod 400 and the first resonator 300a, thereby restricting the movement of the first coupling rod 400, and makes it easier to assemble and disassemble the first coupling rod 400 and the first resonator 300a. Furthermore, it allows for greater flexibility in the arrangement of the first coupling rod 400 in the first direction, making it easier to adjust the first coupling rod 400 to a position with suitable coupling strength.

[0189] In some possible embodiments, a plurality of second insulating abutments 620 are provided between the outer peripheral wall of the second resonator 300b and the inner periphery of the third annular portion 430, and the plurality of second insulating abutments 620 are distributed at intervals along the circumference of the third annular portion 430. One end of the second insulating abutment 620 in the radial direction of the third annular portion 430 abuts against the outer peripheral wall of the second resonator 300b, and the other end of the second insulating abutment 620 in the radial direction of the third annular portion 430 abuts against the inner periphery of the third annular portion 430.

[0190] The outer peripheral wall of the second resonator 300b can be radially abutted against the inner periphery of the third annular portion 430 by a plurality of second insulating abutment members 620 arranged circumferentially along the third annular portion 430.

[0191] The second resonator 300b can be connected to the first coupling rod 400 by a plurality of second insulating abutments 620 distributed circumferentially along the third annular portion 430. The second resonator 300b can be used to restrict the movement of the third annular portion 430 in a direction perpendicular to the first direction by the plurality of second insulating abutments 620 distributed circumferentially along the third annular portion 430.

[0192] This facilitates the connection between the first coupling rod 400 and the second resonator 300b, thereby restricting the movement of the first coupling rod 400, and makes it easier to assemble and disassemble the first coupling rod 400 and the second resonator 300b. Furthermore, it allows for greater flexibility in the arrangement of the first coupling rod 400 in the first direction, making it easier to adjust the first coupling rod 400 to a position with suitable coupling strength.

[0193] Figure 10 This is a schematic diagram of a first insulating contact member provided in an embodiment of this application. Figure 11 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0194] like Figure 10 , Figure 11As shown, in some possible embodiments, the first insulating contact 610 includes a first contact portion 611 and a first claw portion 612. The first contact portion 611 is engaged with the second annular portion 420 via the first claw portion 612. The first contact portion 611 is disposed between the second annular portion 420 and the first resonator 300a. One end of the first contact portion 611 in the radial direction of the second annular portion 420 abuts against the outer peripheral wall of the first resonator 300a, and the other end of the first contact portion 611 in the radial direction of the second annular portion 420 abuts against the inner periphery of the second annular portion 420.

[0195] In this way, the first insulating contact 610 is set more securely between the second annular portion 420 and the first resonator 300a, and is not easy to fall off between the second annular portion 420 and the first resonator 300a, which facilitates a more stable connection between the first coupling rod 400 and the first resonator 300a.

[0196] For example, the first abutting part 611 is fixedly connected to the first claw part 612 at both ends in the first direction.

[0197] For example, the first claw portion 612 located at the end of the first abutting portion 611 facing the cover plate 200 is engaged with the side of the second annular portion 420 facing the cover plate 200, and the first claw portion 612 located at the end of the first abutting portion 611 away from the cover plate 200 is engaged with the side of the second annular portion 420 away from the cover plate 200.

[0198] In some possible embodiments, the second insulating contact 620 includes a second contact portion 621 and a second claw portion 622. The second contact portion 621 is engaged with the third annular portion 430 via the second claw portion 622. The second contact portion 621 is disposed between the third annular portion 430 and the second resonator 300b. One end of the second contact portion 621 in the radial direction of the third annular portion 430 abuts against the outer peripheral wall of the second resonator 300b, and the other end of the second contact portion 621 in the radial direction of the third annular portion 430 abuts against the inner periphery of the third annular portion 430.

[0199] In this way, the second insulating abutment 620 is set more securely between the third annular portion 430 and the second resonator 300b, and is not easy to fall off between the third annular portion 430 and the second resonator 300b, which facilitates a more stable connection between the first coupling rod 400 and the second resonator 300b.

[0200] For example, the second abutment portion 621 is fixedly connected to the second claw portion 622 at both ends in the first direction.

[0201] For example, the second claw portion 622 located at the end of the second abutment portion 621 facing the cover plate 200 is engaged on the side of the third annular portion 430 facing the cover plate 200, and the second claw portion 622 located at the end of the second abutment portion 621 away from the cover plate 200 is engaged on the side of the third annular portion 430 away from the cover plate 200.

[0202] Figure 12 This is a schematic diagram of yet another first coupling rod provided in an embodiment of this application.

[0203] Figure 12 As shown, and see Figure 11 In some possible implementations, the second annular portion 420 has a first engaging notch 421 on its side in the first direction, which corresponds to the first claw portion 612. The first engaging notch 421 penetrates the second annular portion 420 radially, and the first claw portion 612 is engaged in the corresponding first engaging notch 421.

[0204] The first locking notch 421 can restrict the first locking claw portion 612, which is locked therein, from moving circumferentially along the second annular portion 420.

[0205] In this way, the engagement between the first insulating abutment 610 and the second annular portion 420 is relatively stable, and problems such as connection failure between the second annular portion 420 and the first resonator 300a are less likely to occur due to the first insulating abutment 610 moving along the circumference of the second annular portion 420.

[0206] When both ends of the first abutment portion 611 are fixedly connected with the first claw portion 612, the second annular portion 420 has a first engaging notch 421 on one side facing the cover plate 200, corresponding to the first claw portion 612 connected to the end of the first abutment portion 611 facing the cover plate 200. The first claw portion 612 connected to the end of the first abutment portion 611 facing the cover plate 200 is engaged in the corresponding first engaging notch 421 on one side of the second annular portion 420 facing the cover plate 200. The second annular portion 420 has a first engaging notch 421 on one side away from the cover plate 200, corresponding to the first claw portion 612 connected to the end of the first abutment portion 611 away from the cover plate 200. The first claw portion 612 connected to the end of the first abutment portion 611 away from the cover plate 200 is engaged in the corresponding first engaging notch 421 on one side of the second annular portion 420 away from the cover plate 200.

[0207] In some examples, the first claw portion 612 may be a structure in which both ends extend radially along the second annular portion 420, with one end of the first claw portion 612 facing the first resonator 300a connected to the first abutment portion 611, and the other end of the first claw portion 612 away from the first resonator 300a located between the inner periphery and the outer periphery of the second annular portion 420.

[0208] In some possible implementations, the third annular portion 430 has a second engaging notch 431 on its side in the first direction, which corresponds to the second claw portion 622. The second engaging notch 431 penetrates the third annular portion 430 radially, and the second claw portion 622 is engaged in the corresponding second engaging notch 431.

[0209] The second locking notch 431 can restrict the second locking claw portion 622, which is locked therein, from moving circumferentially along the third annular portion 430.

[0210] In this way, the engagement between the second insulating abutment 620 and the third annular portion 430 is relatively stable, and problems such as connection failure between the third annular portion 430 and the second resonator 300b are less likely to occur due to the second insulating abutment 620 moving along the circumference of the third annular portion 430.

[0211] When both ends of the second abutment portion 621 are fixedly connected with second claw portions 622, the third annular portion 430 has a second engaging notch 431 on one side facing the cover plate 200, corresponding to the second claw portion 622 connected to one end of the second abutment portion 621 facing the cover plate 200. The second claw portion 622 connected to one end of the second abutment portion 621 facing the cover plate 200 is engaged in the corresponding second engaging notch 431 on one side of the third annular portion 430 facing the cover plate 200. The third annular portion 430 has a second engaging notch 431 on one side away from the cover plate 200, corresponding to the second claw portion 622 connected to one end of the second abutment portion 621 away from the cover plate 200. The second claw portion 622 connected to one end of the second abutment portion 621 away from the cover plate 200 is engaged in the corresponding second engaging notch 431 on one side of the third annular portion 430 away from the cover plate 200.

[0212] In some examples, the second claw portion 622 may be a structure in which both ends extend radially along the third annular portion 430, with one end of the second claw portion 622 facing the second resonator 300b connected to the second abutment portion 621, and the other end of the second claw portion 622 away from the second resonator 300b located between the inner periphery and the outer periphery of the third annular portion 430.

[0213] Figure 13 This is a schematic diagram of yet another first insulating contact member provided in an embodiment of this application. Figure 14 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0214] like Figure 13 , Figure 14 As shown, and see Figure 12In other examples, the first claw portion 612 includes a first connecting portion 6121 and a first claw portion 6122. The two ends of the first connecting portion 6121 extend radially along the second annular portion 420. One end of the first connecting portion 6121 is connected to the first abutting portion 611, and the other end of the first connecting portion 6121 is connected to the first claw portion 6122. The first connecting portion 6121 is engaged in the corresponding first engaging notch 421, and the first claw portion 6122 is located outside the second annular portion 420 and abuts against the outer periphery of the second annular portion 420.

[0215] In this way, the first insulating abutment 610 is more firmly connected to the second annular portion 420, and the first insulating connector 630 is not easy to fall off from the second annular portion 420.

[0216] In other examples, the second claw portion 622 includes a second connecting portion 6221 and a second claw portion 6222. The two ends of the second connecting portion 6221 extend radially along the third annular portion 430. One end of the second connecting portion 6221 is connected to the second abutting portion 621, and the other end of the second connecting portion 6221 is connected to the second claw portion 6222. The second connecting portion 6221 is engaged in the corresponding second engaging notch 431, and the second claw portion 6222 is located outside the third annular portion 430 and abuts against the outer periphery of the third annular portion 430.

[0217] In this way, the second insulating abutment 620 is more securely connected to the third annular portion 430, and the second insulating connector 640 is less likely to fall off the third annular portion 430.

[0218] Figure 15 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0219] like Figure 15 As shown, the first resonator 300a may include a first rod portion 310a and a first outward-flaring structure 320a disposed at one end of the first rod portion 310a. The first rod portion 310a is a hollow structure, and both ends of the first rod portion 310a extend along a first direction. The first outward-flaring structure 320a is located at the end of the first rod portion 310a facing the cover plate 200.

[0220] For example, the end of the first rod portion 310a away from the cover plate 200 can be fixedly connected to the cavity 100. For instance, the end of the first rod portion 310a away from the cover plate 200 can be fixedly connected to the cavity 100 by welding, snap-fitting, fastener connection, or other means.

[0221] For example, a first resonant column 151a may be provided in the first resonant cavity 150a. The first resonant column 151a may be an integral structure with the cavity 100. The end of the first rod 310a away from the cover plate 200 may be fixedly connected to the end of the first resonant column 151a facing the cover plate 200 by a second fastener.

[0222] The second resonator 300b may include a second rod portion 310b and a second outward-flaring structure 320b disposed at one end of the second rod portion 310b. The second rod portion 310b is a hollow structure, and both ends of the second rod portion 310b extend along a first direction. The second outward-flaring structure 320b is located at the end of the second rod portion 310b facing the cover plate 200.

[0223] For example, the end of the second rod portion 310b away from the cover plate 200 can be fixedly connected to the cavity 100. For instance, the end of the second rod portion 310b away from the cover plate 200 can be fixedly connected to the cavity 100 by means of welding, snap-fitting, fastener connection, etc.

[0224] For example, a second resonant column 151b may be provided inside the second resonant cavity 150b. The second resonant column 151b may be an integral structure with the cavity 100. The end of the second rod 310b away from the cover plate 200 may be fixedly connected to the end of the second resonant column 151b facing the cover plate 200 by a third fastener.

[0225] Figure 16 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0226] like Figure 16 As shown, and see Figure 15 In some other possible embodiments, the second annular portion 420 is sleeved on the outside of the first rod portion 310a, and the second annular portion 420 is spaced apart on the side of the first outward-facing structure 320a away from the cover plate 200. The second annular portion 420 is connected to the first outward-facing structure 320a by a plurality of first insulating connectors 630 passing through the second annular portion 420 and the first outward-facing structure 320a. The plurality of first insulating connectors 630 are distributed circumferentially around the second annular portion 420, and the first resonator 300a can be used to restrict the movement of the second annular portion 420 by the plurality of first insulating connectors 630 distributed circumferentially around the second annular portion 420.

[0227] In this way, the connection between the second annular portion 420 and the first resonator 300a is relatively stable, and the portion of the first coupling rod 400 inside the first coupling window 120 does not need to be connected to the cavity 100 to achieve a relatively stable connection between the first coupling rod 400 and the cavity 100.

[0228] The second annular portion 420 has a first mounting hole corresponding to the first insulating connector 630, and the first outward-facing structure 320a has a second mounting hole corresponding to the first insulating connector 630. The first insulating connector 630 passes through the corresponding first mounting hole and the corresponding second mounting hole.

[0229] In some examples, the first rod portion 310a can be integrated with the first outward-flaring structure 320a.

[0230] In other examples, the first rod portion 310a and the first outward-facing structure 320a can be separate structures, with the first rod portion 310a and the first outward-facing structure 320a being fixedly connected.

[0231] The third annular portion 430 is sleeved on the outside of the second rod portion 310b, and the third annular portion 430 is spaced apart on the side of the second outward-facing structure 320b away from the cover plate 200. The third annular portion 430 is connected to the second outward-facing structure 320b by a plurality of second insulating connectors 640 passing through the third annular portion 430 and the second outward-facing structure 320b. The plurality of second insulating connectors 640 are distributed circumferentially around the third annular portion 430, and the second resonator 300b can be used to restrict the movement of the third annular portion 430 by the plurality of second insulating connectors 640 distributed circumferentially around the third annular portion 430.

[0232] In this way, the connection between the third annular portion 430 and the second resonator 300b is relatively stable, and the portion of the first coupling rod 400 inside the first coupling window 120 does not need to be connected to the cavity 100 to achieve a relatively stable connection between the first coupling rod 400 and the cavity 100.

[0233] The third annular portion 430 has a third mounting hole corresponding to the second insulating connector 640, and the second outward-facing structure 320b has a fourth mounting hole corresponding to the second insulating connector 640. The second insulating connector 640 passes through the corresponding third mounting hole and the corresponding fourth mounting hole.

[0234] In some examples, the second rod 310b can be integrated with the second outward-flaring structure 320b.

[0235] In other examples, the second rod portion 310b and the second outward-facing structure 320b can be separate structures, with the second rod portion 310b and the second outward-facing structure 320b being fixedly connected.

[0236] For example, the first outward-facing structure 320a has a first clearance notch 321a on the side facing the second resonator 300b, and the second outward-facing structure 320b has a second clearance notch 321b on the side facing the first resonator 300a. The first coupling rod 400 passes through the first clearance notch 321a and the second clearance notch 321b.

[0237] In some possible implementations, the first insulating connector 630 is interference-fitted with the second annular portion 420 and the first outward-facing structure 320a. Specifically, the first insulating connector 630 is interference-fitted with the wall of the corresponding first mounting hole and the wall of the corresponding second mounting hole.

[0238] This facilitates a stable connection between the second annular portion 420 and the first outward-facing structure 320a.

[0239] In some possible implementations, the second insulating connector 640 is interference-fitted with the third annular portion 430 and the second outward-facing structure 320b. Specifically, the second insulating connector 640 is interference-fitted with the wall of the corresponding third mounting hole and the wall of the corresponding fourth mounting hole.

[0240] This facilitates a stable connection between the third annular portion 430 and the second outward-facing structure 320b.

[0241] Figure 17 This is a schematic diagram of a first insulating connector provided in an embodiment of this application.

[0242] like Figure 17 As shown, for example, the outer peripheral wall of the first insulating connector 630 has a second annular groove 631 and a third annular groove 632. The second annular groove 631 and the third annular groove 632 are both arranged around the first insulating connector 630 around the first insulating connector 630 in the circumferential direction. The second annular groove 631 and the third annular groove 632 are spaced apart in the first direction.

[0243] like Figure 16 , Figure 17 As shown, the second annular portion 420 is fitted within the second annular groove 631, and the bottom of the second annular groove 631 is in an interference fit with the second annular portion 420. Specifically, the bottom of the second annular groove 631 is in an interference fit with the wall of the corresponding first mounting hole.

[0244] The first outward-facing structure 320a is fitted within the third annular groove 632, and the bottom of the third annular groove 632 is in an interference fit with the first outward-facing structure 320a. Specifically, the bottom of the third annular groove 632 is in an interference fit with the wall of the corresponding second mounting hole.

[0245] The first insulating connector 630 includes a first frustum section 633 located between the end of the first insulating connector 630 away from the cover plate 200 and the second annular groove 631. The outer diameter of the first frustum section 633 gradually increases from the end away from the cover plate 200 to the end facing the cover plate 200. The end of the first frustum section 633 facing the cover plate 200 extends to the second annular groove 631.

[0246] The first insulating connector 630 also includes a second frustum section 634 located between the second annular groove 631 and the third annular groove 632. The outer diameter of the second frustum section 634 gradually increases from the end away from the cover plate 200 to the end facing the cover plate 200. The end of the second frustum section 634 facing the cover plate 200 extends to the third annular groove 632. The projection of the portion of the first insulating connector 630 between the end away from the cover plate 200 and the second frustum section 634 along the first direction is located within the projection of the end of the second frustum section 634 away from the cover plate 200 along the first direction.

[0247] Thus, when the second annular portion 420 is assembled onto the first outward-facing structure 320a via the first insulating connector 630, the first frustum segment 633, the second annular groove 631, and the second frustum segment 634 can first pass through the corresponding second mounting holes, so that the first outward-facing structure 320a is engaged in the third annular groove 632 and has an interference fit with the bottom of the third annular groove 632. Then, the first frustum segment 633 is passed through the corresponding first mounting hole, so that the second annular portion 420 is engaged in the second annular groove 631 and has an interference fit with the bottom of the second annular groove 631. The assembly of the first insulating connector 630 with the second annular portion 420 and the first outward-facing structure 320a and the achievement of the interference fit are relatively easy. In addition, the second annular groove 631 and the third annular groove 632 can respectively restrict the movement of the second annular portion 420 and the first outward-facing structure 320a in the first direction, so that the connection between the second annular portion 420 and the first outward-facing structure 320a is relatively stable.

[0248] The bottom of the second annular groove 631 refers to the side wall of the second annular groove 631 that is opposite to the opening of the second annular groove 631 in its radial direction.

[0249] The bottom of the third annular groove 632 refers to the side wall of the third annular groove 632 that is opposite to the opening of the third annular groove 632 in its radial direction.

[0250] The first frustum segment 633 can be located at the end of the first insulating connector 630 that is away from the cover plate 200 in the first direction.

[0251] The first insulating connector 630 further includes a first cylindrical segment, a second cylindrical segment, a third cylindrical segment, and a fourth cylindrical segment. The first frustum segment 633, the second frustum segment 634, the first cylindrical segment, the second cylindrical segment, the third cylindrical segment, and the fourth cylindrical segment are coaxially arranged. Both ends of the first cylindrical segment are connected to the first frustum segment 633 and the second cylindrical segment, respectively. The end of the second cylindrical segment furthest from the first cylindrical segment is connected to the second frustum segment 634. The end of the second frustum segment 634 furthest from the second cylindrical segment is connected to the third cylindrical segment. The third cylindrical segment furthest from the second frustum segment 634... One end is connected to the fourth cylindrical segment. The outer diameter of the first cylindrical segment is smaller than the outer diameter of the end of the first frustum segment 633 facing the cover plate 200. The outer diameter of the second cylindrical segment is larger than the outer diameter of the first cylindrical segment. The outer diameter of the third cylindrical segment is smaller than the outer diameter of the end of the second frustum segment 634 facing the cover plate 200. The outer diameter of the fourth cylindrical segment is larger than the outer diameter of the third cylindrical segment. The first frustum segment 633, the first cylindrical segment and the second cylindrical segment form a second annular groove 631. The second frustum segment 634, the third cylindrical segment and the fourth cylindrical segment form a third annular groove 632.

[0252] For example, the outer peripheral wall of the second insulating connector 640 has a fourth annular groove and a fifth annular groove. The fourth annular groove and the fifth annular groove are both arranged around the second insulating connector 640 in the circumferential direction. The fourth annular groove and the fifth annular groove are spaced apart in the first direction.

[0253] The third annular portion 430 is fitted into the fourth annular groove, and the bottom of the fourth annular groove is interference-fitted with the third annular portion 430. Specifically, the bottom of the fourth annular groove is interference-fitted with the wall of the corresponding third mounting hole.

[0254] The second outward-facing structure 320b is fitted within the fifth annular groove, and the bottom of the fifth annular groove is interference-fitted with the second outward-facing structure 320b. Specifically, the bottom of the fifth annular groove is interference-fitted with the wall of the corresponding fourth mounting hole.

[0255] The second insulating connector 640 includes a third frustum section located between the end of the second insulating connector 640 away from the cover plate 200 and the fourth annular groove. The outer diameter of the third frustum section gradually increases from the end away from the cover plate 200 to the end facing the cover plate 200. The end of the third frustum section facing the cover plate 200 extends to the fourth annular groove.

[0256] The second insulating connector 640 also includes a fourth frustum segment located between the fourth annular groove and the fifth annular groove. The outer diameter of the fourth frustum segment gradually increases from the end away from the cover plate 200 to the end facing the cover plate 200. The end of the fourth frustum segment facing the cover plate 200 extends to the fifth annular groove. The projection of the portion of the second insulating connector 640 between the end away from the cover plate 200 and the fourth frustum segment along the first direction is located within the projection of the end of the fourth frustum segment away from the cover plate 200 along the first direction.

[0257] Thus, when the third annular portion 430 is assembled onto the second outward-facing structure 320b via the second insulating connector 640, the third frustum segment, the fourth annular groove, and the fourth frustum segment can first pass through the corresponding fourth mounting hole, so that the second outward-facing structure 320b is engaged in the fifth annular groove and has an interference fit with the bottom of the fifth annular groove. Then, the third frustum segment passes through the corresponding third mounting hole, so that the third annular portion 430 is engaged in the fourth annular groove and has an interference fit with the bottom of the fourth annular groove. This makes the assembly of the second insulating connector 640 with the third annular portion 430 and the second outward-facing structure 320b, as well as the achieving of the interference fit, relatively easy. Furthermore, the fourth annular groove and the fifth annular groove can respectively restrict the movement of the third annular portion 430 and the second outward-facing structure 320b in the first direction, making the connection between the third annular portion 430 and the second outward-facing structure 320b more secure.

[0258] The bottom of the fourth annular groove refers to the side wall of the fourth annular groove that is opposite to the groove opening in the radial direction.

[0259] The bottom of the fifth annular groove refers to the side wall of the fifth annular groove that is opposite to the opening of the fifth annular groove in its radial direction.

[0260] The third truncated cone section can be located at the end of the second insulating connector 640 that is away from the cover plate 200 in the first direction.

[0261] The second insulating connector 640 further includes a fifth cylindrical segment, a sixth cylindrical segment, a seventh cylindrical segment, and an eighth cylindrical segment. The third frustum segment, the fourth frustum segment, the fifth cylindrical segment, the sixth cylindrical segment, the seventh cylindrical segment, and the eighth cylindrical segment are coaxially arranged. Both ends of the fifth cylindrical segment are connected to the third frustum segment and the sixth cylindrical segment, respectively. The end of the sixth cylindrical segment furthest from the fifth cylindrical segment is connected to the fourth frustum segment. The end of the fourth frustum segment furthest from the sixth cylindrical segment is connected to the seventh cylindrical segment. The seventh cylindrical segment furthest from the fourth frustum segment... One end is connected to the eighth cylindrical segment. The outer diameter of the fifth cylindrical segment is smaller than the outer diameter of the end of the third frustum segment facing the cover plate 200. The outer diameter of the sixth cylindrical segment is larger than the outer diameter of the fifth cylindrical segment. The outer diameter of the seventh cylindrical segment is smaller than the outer diameter of the end of the fourth frustum segment facing the cover plate 200. The outer diameter of the eighth cylindrical segment is larger than the outer diameter of the seventh cylindrical segment. The third frustum segment, the fifth cylindrical segment, and the sixth cylindrical segment form a fourth annular groove. The fourth frustum segment, the seventh cylindrical segment, and the eighth cylindrical segment form a fifth annular groove.

[0262] Figure 18 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application. Figure 19 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0263] like Figure 18 , Figure 19 As shown, in some possible implementations, the first resonator 300a is welded to the first coupling rod 400, the first resonator 300a is electrically connected to the first coupling rod 400, and the first coupling rod 400 forms a capacitive coupling with the second resonator 300b.

[0264] In this way, the connection between the first resonator 300a and the first coupling rod 400 is relatively easy, the connection structure is simple, the space occupied is small, and it is convenient for the arrangement of the cavity filter components.

[0265] Figure 20 This is a schematic diagram of yet another first coupling rod provided in an embodiment of this application. Figure 21 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application. Figure 22 This is a schematic diagram of another cavity filter dual-cavity coupling provided in an embodiment of this application.

[0266] like Figures 20-22 As shown, in some examples, the third annular portion 430 is a non-closed circular structure. For example, the third annular portion 430 can be a half-circular structure, a one-third-circular structure, a two-thirds-circular structure, a one-quarter-circular structure, or a three-quarters-circular structure, etc.

[0267] The circumferential length of the third annular portion 430 can be determined according to the strength requirements of the capacitive coupling formed between the first coupling rod 400 and the second resonator 300b, as well as the position of the first coupling rod 400 in the first direction.

[0268] When the third annular portion 430 is a non-closed circular structure, the notch in the third annular portion 430 can be used to avoid other devices. For example, the notch in the third annular portion 430 can be used to avoid other coupling rods or connectors used for coupling with the second resonator 300b, so as to facilitate the arrangement of the cavity filter devices. In addition, the circumferential length of the third annular portion 430 can be adjusted according to the required strength of the capacitive coupling formed between the first resonator 300a and the second resonator 300b, so as to adjust the strength of the capacitive coupling formed between the first resonator 300a and the second resonator 300b to a suitable range.

[0269] Figure 23 This is a schematic diagram of another type of cavity filter multi-cavity coupling provided in an embodiment of this application. Figure 24 This is a schematic diagram of another cavity filter multi-cavity coupling provided in an embodiment of this application.

[0270] like Figure 23 , Figure 24 As shown, the cavity filter includes a third resonator 300c among the multiple resonators 300, and the cavity 100 includes a third resonator 300c among the multiple resonant cavities 150. The third resonator 300c is disposed in the third resonant cavity. A second partition wall 160 is provided between the third resonant cavity and the second resonant cavity 150b. A second coupling window is provided between the end of the second partition wall 160 facing the cover plate 200 and the cover plate 200. The second coupling window can be formed by the second partition wall 160 and the cover plate 200 enclosing each other.

[0271] The second partition wall 160 may be made of conductive materials such as metal, and the second partition wall 160 may be an integral structure with the cavity 100.

[0272] The cavity filter also includes a second coupling rod 800, which passes through the second coupling window. The third resonator 300c is capacitively coupled to the second resonator 300b through the second coupling rod 800.

[0273] The third resonator 300c is connected to the second coupling rod 800, and the third resonator 300c is used to limit the movement of the second coupling rod 800.

[0274] The second coupling rod 800 includes a fourth annular portion 810, which is located inside the second resonant cavity 150b. The fourth annular portion 810 is sleeved on the outside of the second resonator 300b and forms a capacitive coupling with the second resonator 300b. The fourth annular portion 810 is a non-closed circular structure. The third annular portion 430 and the fourth annular portion 810 are distributed at intervals in the circumferential direction of the second resonator 300b.

[0275] In this way, the first coupling rod 400 and the second coupling rod 800 will not interfere with each other in the second resonant cavity 150b, which facilitates the arrangement of the first coupling rod 400 and the second coupling rod 800.

[0276] The third annular portion 430 and the fourth annular portion 810 can be coaxially arranged, and the third annular portion 430 and the fourth annular portion 810 can be located at the same position in the first direction.

[0277] The connection between the second coupling rod 800 and the third resonator 300c can be referenced to the connection between the first coupling rod 400 and the first resonator 300a.

[0278] The cooperation between the fourth annular portion 810 and the second resonator 300b can be referred to the cooperation between the third annular portion 430 and the second resonator 300b.

[0279] The cavity filter also includes a third tuning element made of a conductive material such as metal. The cover plate 200 has a third tuning hole at the second coupling window. The third tuning hole is a through hole, and the third tuning element is inserted into it in a manner that allows it to move along a first direction. The coupling strength between the second resonator 300b and the third resonator 300c can be changed by altering the length of the portion of the third tuning element inserted into the cavity 100, thereby tuning the cavity filter. The projection of the second coupling rod 800 along the first direction does not intersect with the projection of the third tuning element along the first direction.

[0280] The fit between the third tuning element and the cover plate 200 can be referenced to the fit between the first tuning element 220 and the cover plate 200.

[0281] The fit between the second coupling rod 800 and the second partition wall 160 can be referenced to the fit between the first coupling rod 400 and the first partition wall 110.

[0282] For example, the second coupling rod 800 may further include a fifth annular portion 820, which is located inside the third resonant cavity. The fifth annular portion 820 has a circular structure and is sleeved on the outside of the third resonant cavity. The fifth annular portion 820 forms a capacitive coupling with the third resonator 300c.

[0283] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0284] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0285] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0286] The term "multiple" in this article refers to two or more. The term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects.

[0287] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0288] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A cavity filter, characterized in that, It includes a cavity, a cover plate, a first resonator, a second resonator, a coupling rod, and a tuning element; The cavity has an installation port communicating with the inner cavity of the cavity on one side in the first direction, and the cover plate covers the cavity and seals the installation port; The cavity has a first resonant cavity and a second resonant cavity arranged along a second direction. The first resonator is disposed in the first resonant cavity and the second resonator is disposed in the second resonant cavity. A partition wall is provided between the first resonant cavity and the second resonant cavity. A coupling window is provided between the end of the partition wall facing the cover plate and the cover plate. The coupling rod passes through the coupling window, and the first resonator forms a capacitive coupling with the second resonator through the coupling rod; The cover plate has a tuning hole at the coupling window, and the tuning element is inserted into the tuning hole in a manner that allows it to move along the first direction. The projection of the coupling rod along the first direction does not intersect with the projection of the tuning element along the first direction. The first resonator is connected to the coupling rod, and the first resonator is used to limit the movement of the coupling rod; The first direction is the height direction of the cavity filter, and the second direction is perpendicular to the first direction.

2. The cavity filter according to claim 1, characterized in that, It also includes insulated connectors; The connecting seat is disposed within the coupling window and is fixedly connected to the partition wall. The outer peripheral wall of the connecting seat has a first annular groove extending circumferentially along the connecting seat. The coupling rod includes a first annular portion, which is engaged within the first annular groove. The end of the connector facing the cover plate has a clearance hole, and the projection of the tuning element along the first direction is located within the projection of the clearance hole along the first direction.

3. The cavity filter according to claim 2, characterized in that, The connecting seat includes a support ring and a limiting member; The limiting component includes a connecting post and a limiting ring. The two ends of the connecting post extend along the first direction. The end of the connecting post away from the cover plate is fixedly connected to the partition wall. The limiting ring is fixedly connected to the outer peripheral wall of the connecting post. The support ring is sleeved on the connecting post. The support ring is located between the limiting ring and the partition wall. The first annular groove is formed between the support ring and the limiting ring. The first annular part is sleeved on the connecting post. The first annular part is stacked between the support ring and the limiting ring. The limiting ring presses the first annular part and the support ring onto the partition wall. The end of the connecting post facing the cover plate has the clearance hole.

4. The cavity filter according to claim 3, characterized in that, The clearance hole is a blind hole, and the end of the connecting post away from the cover plate is fixedly connected to the partition wall by fasteners that pass through the bottom of the clearance hole and the partition wall.

5. The cavity filter according to claim 3 or 4, characterized in that, The end of the connecting column away from the cover plate is detachably connected to the partition wall.

6. The cavity filter according to any one of claims 2-5, characterized in that, The connecting seat is a cylindrical structure, and the first annular part is an annular structure.

7. The cavity filter according to any one of claims 1-6, characterized in that, The coupling rod includes a second annular portion, which is a circular ring structure; The second annular portion is located inside the first resonant cavity, and the second annular portion is sleeved on the outside of the first resonator, forming a capacitive coupling with the first resonator.

8. The cavity filter according to claim 7, characterized in that, A plurality of insulating abutment members are provided between the outer peripheral wall of the first resonator and the inner periphery of the second annular portion, and the plurality of insulating abutment members are distributed at intervals along the circumferential direction of the second annular portion; One end of the insulating abutment in the radial direction of the second annular portion abuts against the outer peripheral wall of the first resonator, and the other end of the insulating abutment in the radial direction of the second annular portion abuts against the inner periphery of the second annular portion.

9. The cavity filter according to claim 8, characterized in that, The insulating contact member includes a contact portion and a claw portion; The abutting part is engaged with the second annular part by the claw part. The abutting part is disposed between the second annular part and the first resonator. One end of the abutting part in the radial direction of the second annular part abuts against the outer peripheral wall of the first resonator, and the other end of the abutting part in the radial direction of the second annular part abuts against the inner periphery of the second annular part.

10. The cavity filter according to claim 9, characterized in that, The second annular portion has a snap-fit ​​notch on its side in the first direction that corresponds to the snap-fit ​​portion. The snap-fit ​​notch penetrates the second annular portion radially, and the snap-fit ​​portion is engaged in the corresponding snap-fit ​​notch.

11. The cavity filter according to claim 7, characterized in that, The first resonator includes a rod and an outwardly flared structure disposed at one end of the rod. Both ends of the rod extend along the first direction, and the outwardly flared structure is located at the end of the rod facing the cover plate. The second annular portion is sleeved on the outside of the rod portion, and the second annular portion is spaced apart on the side of the outward-turning structure away from the cover plate; The second annular portion is connected to the outward-facing structure by a plurality of insulating connectors passing through the second annular portion and the outward-facing structure, and the plurality of insulating connectors are distributed at intervals along the circumference of the second annular portion.

12. The cavity filter according to claim 11, characterized in that, The insulating connector is interference-fitted with the second annular portion and the outward-facing structure.

13. The cavity filter according to claim 12, characterized in that, The outer peripheral wall of the insulating connector has a second annular groove and a third annular groove. The second annular groove and the third annular groove are both arranged around the insulating connector around its circumference. The second annular groove and the third annular groove are spaced apart in the first direction. The second annular portion is engaged in the second annular groove, and the bottom of the second annular groove is in an interference fit with the second annular portion. The outward-folding structure is fitted into the third annular groove, and the bottom of the third annular groove is interference-fitted with the outward-folding structure. The insulating connector includes a first frustum segment located between the end of the insulating connector away from the cover plate and the second annular groove. The outer diameter of the first frustum segment gradually increases from the end away from the cover plate to the end facing the cover plate. The end of the first frustum segment facing the cover plate extends to the second annular groove. The insulating connector further includes a second frustum segment located between the second annular groove and the third annular groove. The outer diameter of the second frustum segment gradually increases from the end away from the cover plate to the end facing the cover plate. The end of the second frustum segment facing the cover plate extends to the third annular groove. The projection of the portion of the insulating connector between the end away from the cover plate and the second frustum segment along the first direction is located within the projection of the end of the second frustum segment away from the cover plate along the first direction.

14. The cavity filter according to any one of claims 1-6, characterized in that, The first resonator is welded to the coupling rod, the first resonator is electrically connected to the coupling rod, and the coupling rod forms a capacitive coupling with the second resonator.

15. The cavity filter according to any one of claims 1-14, characterized in that, The second resonator is connected to the coupling rod, and the second resonator is used to limit the movement of the coupling rod.

16. The cavity filter according to any one of claims 1-15, characterized in that, The coupling rod includes a third annular portion, which is a circular ring structure; The third annular portion is located inside the second resonant cavity, and the third annular portion is sleeved on the outside of the second resonator, forming a capacitive coupling with the second resonator.

17. The cavity filter according to claim 16, characterized in that, The third annular portion is a non-closed circular structure.

18. A communication device, characterized in that, Includes the cavity filter as described in any one of claims 1-17.

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