Coupling structure of dielectric filter

Abstract

The utility model discloses a coupling structure of a dielectric filter, which comprises a main body and a cover plate covered on the main body, a retaining wall is arranged in the main body, communicated resonant cavities are separated in the main body by the retaining wall, and resonators are respectively arranged in the resonant cavities; a coupling piece is arranged between the resonators, a communication groove is formed in the retaining wall, the coupling piece is provided with a spanning section which is bent upwards, the spanning section is arranged in the communication groove, a coupling screw rod is arranged on the cover plate, and the coupling screw rod is arranged above the coupling piece in a lifting manner.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, and particularly relates to a coupling structure of a dielectric filter. Background Art

[0002] There are various types of filters, and different types are applied in different frequency ranges and occasions. A dielectric filter is formed by the coupling between dielectric resonators. The dielectric resonator filter has high Q value, low insertion loss, small size and light weight, and is widely used in systems such as wireless base stations, satellite communications, navigation systems, and electronic countermeasures.

[0003] The coupling problem between resonators is the key issue determining the qualification of the dielectric filter. In the prior art, it is generally composed of metal debugging screws or plastic screws, and the debugging bandwidth range is small. Summary of the Utility Model

[0004] To solve the technical problems in the background art, the utility model proposes a coupling structure of a dielectric filter.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] A coupling structure of a dielectric filter includes a main body and a cover plate covering the main body. A retaining wall is arranged in the main body, and the retaining wall separates a connected resonant cavity in the main body. Resonators are respectively arranged in the resonant cavities;

[0007] Coupling sheets are arranged between the resonators. A communication groove is arranged on the retaining wall. The coupling sheet has a spanning section bent upward, and the spanning section is placed in the communication groove. A coupling screw is arranged on the cover plate, and the coupling screw is arranged above the coupling sheet in a liftable manner.

[0008] Preferably, the coupling sheet further includes a connecting section fixed to the bottom of the resonant cavity, and the spanning section is connected to the connecting section placed in the resonant cavity. Through the above improvement, the whole coupling sheet includes connecting sections placed in two main bodies and a spanning section arranged between the connecting sections, and the spanning section connects the connecting sections through the connecting groove, so that the coupling sheet is centered between the two main bodies.

[0009] Preferably, the connecting section includes a first extension section horizontally arranged relative to the lower surface of the resonant cavity and a second extension section connected to the first extension section. The second extension section is horizontally arranged relative to the retaining wall and extends along the length direction of the retaining wall. Through the above improvement, a coupling capacitor is formed by the cooperation of the coupling sheet and the coupling screw. The first extension section is fixed in the resonant cavity, and the second extension section is bent and horizontally arranged relative to the retaining wall, increasing the area of the coupling sheet in the projection direction of the resonator, making the whole coupling capacitor larger, and thus increasing the bandwidth of the filter.

[0010] Preferably, the spanning section includes a first extended section connected to the second extended section and a second extended section connecting the first extended section. The first extended section is horizontally arranged relative to the retaining wall and extends upward along the height direction of the retaining wall. The second extended section is vertically placed in the communication groove. Through the above improvement, the first extended section is horizontally arranged relative to the retaining wall and extends upward along the height direction of the retaining wall, thereby further increasing the area of the coupling piece in the projection direction of the resonator and increasing the coupling capacitance to improve the bandwidth of the filter.

[0011] Preferably, there are at least two coupling screws, and the coupling screws are arranged at intervals along the length direction of the main body. Through the above improvement, by adjusting the inserted length of the coupling screws, the coupling amount between two adjacent resonant cavities can be finely adjusted, thereby finely adjusting the bandwidth of the filter.

[0012] Preferably, a tuning screw is also inserted on the cover plate, and the tuning screw is located above the resonator. Through the above improvement, the resonator includes a resonant cap and a resonant rod, and there is a gap between the resonant rod and the cover plate to form a parallel plate capacitor. By screwing in or out the tuning screw, the size of the parallel plate capacitor can be changed to adjust the resonant frequency.

[0013] Preferably, the material of the coupling piece is brass. Through the above improvement, brass has strong wear resistance and relatively low cost.

[0014] Preferably, the connecting section is fixed in the resonant cavity by screws. Through the above improvement, the stability of the coupling piece fixation is improved.

[0015] Preferably, the cover plate is detachably arranged on the inner upper part of the main body, and the cover plate is fixed on the main body by screws. Through the above improvement, the cover plate can shield interference signals and prevent external dirt from entering.

[0016] Preferably, mounting holes are formed in the resonant cavity, and the resonator is connected to the mounting holes by screws. Through the above improvement, the stability of the resonator installation is improved.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] By arranging coupling pieces between resonators and providing a communication groove on the retaining wall, using the upward bending of the coupling piece to form a spanning section, and arranging coupling screws on the cover plate, the coupling screws are arranged between the resonant cavities in a liftable manner. Since the coupling piece and the coupling screws cooperate to form a coupling capacitor, the upward bending of the coupling piece to form a spanning section increases the area of the coupling piece in the projection direction of the resonator, making the whole coupling capacitor larger. As the coupling capacitor becomes larger, the bandwidth of the filter is increased, and the coupling amount between two adjacent resonant cavities can be finely adjusted by using the coupling screws, thereby finely adjusting the bandwidth of the filter. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of the overall structure of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the inside of the resonator and the coupling piece of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the resonator and the coupling piece of the present utility model from another angle;

[0022] Figure 4 It is a schematic structural diagram of the main body of the present utility model;

[0023] In the figure: 1. Main body; 2. Cover plate; 3. Retaining wall; 4. Resonant cavity; 5. Resonator; 6. Coupling piece; 7. Communication groove; 8. Coupling screw; 9. Tuning screw; 10. Screw; 101. Crossing section; 102. Connection section; 201. First extension section; 202. Second extension section; 203. First extended section; 204. Second extended section; 301. Mounting hole; Detailed Description of the Preferred Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] It should be understood that although the terms upper, middle, lower, top, one end, etc. appear in this text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, rather than to define any directional or sequential limitations.

[0026] As Figures 1-4 shown, a coupling structure of a dielectric filter includes a main body 1 and a cover plate 2 covering the main body 1. A retaining wall 3 is provided inside the main body 1 to partition a connected resonant cavity 4 inside the main body 1, and resonators 5 are respectively provided inside the resonant cavity 4.

[0027] Specifically, coupling pieces 6 are provided between the resonators 5, a communication groove 7 is provided on the retaining wall 3, the coupling piece 6 has a crossing section 101 bent upward, the crossing section 101 is placed inside the communication groove 7, and a coupling screw 8 is provided on the cover plate 2, and the coupling screw 8 is arranged to be liftable between the resonant cavities 4 placed.

[0028] By arranging coupling sheets 6 between resonators 5 and providing communication grooves 7 on the retaining walls 3, a spanning section 101 is formed by bending the coupling sheet 6 upward. A coupling screw 8 is provided on the cover plate 2, and the coupling screw 8 is arranged between the inserted resonators 4 in a liftable manner. Since the coupling sheet 6 and the coupling screw 8 cooperate to form a coupling capacitor, the upward bending of the coupling sheet 6 to form the spanning section 101 increases the area of the coupling sheet 6 in the projection direction of the resonator 5, making the entire coupling capacitor larger. As the coupling capacitor becomes larger, the bandwidth of the filter is increased, and the coupling amount between two adjacent resonators 4 can be finely adjusted by using the coupling screw 8, thereby finely adjusting the bandwidth of the filter.

[0029] As Figures 1-4 shown, for a further explanation of the implementation manner of the coupling sheet 6 in this embodiment, wherein the coupling sheet 6 further includes a connecting section 102 fixed to the bottom of the resonator 4, and the spanning section 101 is connected to the connecting section 102 inserted into the resonator 4.

[0030] The entire coupling sheet 6 includes a connecting section 102 inserted into two main bodies 1 and a spanning section 101 provided between the connecting sections 102, and the spanning section 101 is connected to the connecting section 102 through a connecting groove, so that the coupling sheet 6 is centered between the two main bodies 1.

[0031] Specifically, the connecting section 102 includes a first extension section 201 horizontally arranged relative to the lower surface of the resonator 4 and a second extension section 202 connected to the first extension section 201. The second extension section 202 is horizontally arranged relative to the retaining wall 3 and extends along the length direction of the retaining wall 3.

[0032] Among them, the coupling sheet 6 and the coupling screw 8 cooperate to form a coupling capacitor. The first extension section 201 is fixed in the resonator 4, and the second extension section 202 is horizontally arranged relative to the retaining wall 3 after being bent, increasing the area of the coupling sheet 6 in the projection direction of the resonator 5, making the entire coupling capacitor larger, and thus increasing the bandwidth of the filter.

[0033] Further, the spanning section 101 includes a first extended section 203 connected to the second extension section 202 and a second extended section 204 connecting the first extended section 203. The first extended section 203 is horizontally arranged relative to the retaining wall 3 and extends upward along the height direction of the retaining wall 3, and the second extended section 204 is vertically inserted into the communication groove 7.

[0034] The first extended section 203 is horizontally arranged relative to the retaining wall 3 and extends upward along the height direction of the retaining wall 3, thereby further increasing the area of the coupling sheet 6 in the projection direction of the resonator 5 and increasing the coupling capacitor to improve the bandwidth of the filter.

[0035] Preferably, there are at least two coupling screws 8, and the coupling screws 8 are arranged at intervals along the length direction of the main body 1. By adjusting the insertion length of the coupling screws 8, the coupling amount between two adjacent resonant cavities 4 can be finely adjusted, thereby finely adjusting the bandwidth of the filter.

[0036] Preferably, the material of the coupling sheet 6 is brass, which has strong wear resistance and relatively low cost.

[0037] Preferably, the connecting section 102 is fixed in the resonant cavity 4 by screws 10, which improves the stability of the fixing of the coupling sheet 6.

[0038] In addition, the resonator 5 includes a resonant rod 9 and a resonant disc. A tuning screw 9 is also inserted on the cover plate 2. The tuning screw 9 is located above the resonator 5. There is a gap between the tuning screw 9 and the cover plate 2 to form a parallel plate capacitor. By screwing in or out the tuning screw 9, the size of the parallel plate capacitor can be changed to achieve the adjustment of the resonant frequency.

[0039] As shown in Figures 1-4 In some other embodiments, the cover plate 2 is detachably arranged inside the upper part of the main body 1. The cover plate 2 is fixed to the main body 1 by screws 10. The cover plate 2 can shield interference signals and prevent external dirt from entering.

[0040] In addition, an installation hole 301 is formed in the resonant cavity 4. The resonator 5 is connected to the installation hole 301 by screws 10, which improves the stability of the installation of the resonator 5.

[0041] Preferably, connection ports 11 are provided at both ends of the main body 1. The connection ports 11 are respectively placed in the resonant cavities 4. Port pins are provided on the connection ports 11 for connecting external circuits.

[0042] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A coupling structure of a dielectric filter, characterized in that: The device comprises a main body (1) and a cover plate (2) arranged on the main body (1); a retaining wall (3) is arranged in the main body (1); the retaining wall (3) separates interconnected resonant cavities (4) in the main body (1); and resonators (5) are respectively arranged in the resonant cavities (4); A coupling plate (6) is arranged between the resonators (5), a connecting groove (7) is arranged on the retaining wall (3), the coupling plate (6) has a spanning section (101) bent upward, the spanning section (101) is placed in the connecting groove (7), and a coupling screw rod (8) is arranged on the cover plate (2), and the coupling screw rod (8) is arranged above the coupling plate (6) in a liftable manner.

2. A dielectric filter coupling structure according to claim 1, characterized in that: The coupling plate (6) also includes a connecting section (102) fixed at the bottom of the resonant cavity (4), and the spanning section (101) is connected to the connecting section (102) placed in the resonant cavity (4).

3. A dielectric filter coupling structure according to claim 2, characterized in that: The connecting section (102) comprises a first extension section (201) horizontally arranged relative to the lower surface of the resonant cavity (4), and a second extension section (202) connected to the first extension section (201), wherein the second extension section (202) is horizontally arranged relative to the retaining wall (3) and extends along the length direction of the retaining wall (3).

4. A dielectric filter coupling structure according to claim 3, characterized in that: The spanning section (101) comprises a first extension section (203) connected to the second extension section (202), and a second extension section (204) connected to the first extension section (203), wherein the first extension section (203) is arranged horizontally relative to the retaining wall (3) and extends upward along the height direction of the retaining wall (3), and the second extension section (204) is vertically placed in the connecting groove (7).

5. The coupling structure of a dielectric filter according to claim 1, characterized in that: There are at least two coupling screws (8), and the coupling screws (8) are arranged at intervals along the length direction of the main body (1).

6. The coupling structure of a dielectric filter according to claim 1, characterized in that: A tuning screw (9) is also inserted on the cover plate (2), and the tuning screw (9) is located above the resonator (5).

7. The coupling structure of a dielectric filter according to claim 1, characterized in that: The coupling plate (6) is made of brass.

8. The coupling structure of a dielectric filter according to claim 2, characterized in that: The connecting section (102) is fixed in the resonant cavity (4) by means of screws (10).

9. The coupling structure of a dielectric filter according to claim 1, characterized in that: The cover plate (2) is detachably arranged inside the main body (1), and the cover plate (2) is fixed to the main body (1) by means of screws (10).

10. The coupling structure of a dielectric filter according to claim 1, characterized in that: A mounting hole (301) is formed in the resonant cavity (4), and the resonator (5) is connected to the mounting hole (301) via a screw (10).

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