Band-pass cavity filter

Abstract

The utility model is suitable for the technical field of filters, and provides a band-pass cavity filter, which comprises an outer shell and a cover plate detachably connected to the top of the outer shell. The interior of the outer shell is divided into a first cavity and a second cavity through a partition strip. A resonance rod and an inner shell are respectively mounted in the first cavity and the second cavity, and a signal inlet and a signal outlet are formed in the outer shell; an end cover matched with the top of the inner shell is installed on the cover plate, an adjusting screw rod is rotationally connected to the end cover, a damping ring is installed between the adjusting screw rod and the end cover, and a transmission gear is fixedly connected to the bottom of the adjusting screw rod; a toothed bar is arranged on the inner shell in a penetrating mode and meshed with the transmission gear, and a tuning plate is installed at the end, penetrating out of the inner shell, of the toothed bar. Therefore, the device divides the second cavity into different channels through the tuning plate arranged between the inner shell and the inner wall of the second cavity to form an adjustable micro cavity, and the micro cavity is controlled by operating the adjusting screw rod, so that the tuning process is more conveniently realized.

Description

Technical Field

[0001] The utility model is applicable to the technical field of filters and provides a bandpass cavity filter. Background Art

[0002] Bandpass cavity filters have important applications in electronic communications and wireless communication systems. These filters are designed to selectively pass signals within a specific frequency range and suppress interfering signals in other frequency ranges. Typically, bandpass cavity filters are used to extract signals in a specific frequency band from complex signals to meet the signal selectivity requirements of wireless communication systems.

[0003] The basic principle of a bandpass cavity filter is to selectively allow signals in a specific frequency range to pass through its resonant cavity and attenuate unwanted frequencies through electromagnetic coupling or capacitive coupling. A typical bandpass cavity filter contains one or more resonators that can resonate at a specific frequency and enhance the signal in that frequency range while attenuating signals at other frequencies. Its working principle is based on the formation of a resonance effect of a specific frequency inside the cavity, so that only signals in a specific frequency range can pass through, while other frequencies are suppressed.

[0004] However, many bandpass cavity filters on the market currently have a common problem, that is, the tuning process is not convenient and flexible enough. Traditional bandpass cavity filters usually need to adjust the physical structure of the cavity or change its electrical parameters (such as capacitance or inductance) to achieve frequency tuning. This tuning method is not only complicated to operate, but also requires adjusting multiple tuning screws for tuning, making the tuning process time-consuming and inflexible. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the utility model is to provide a bandpass cavity filter, the purpose is to solve the problems raised in the background technology, the device comprises an outer shell and a cover plate detachably connected to the top of the outer shell; the inner part of the outer shell is separated into a first cavity and a second cavity by a partition bar; the first cavity and the second cavity are respectively installed with a resonant rod and an inner shell, and the outer shell is installed with a signal inlet and a signal outlet;

[0006] An end cover matching the top of the inner shell is installed on the cover plate, an adjusting screw is rotatably connected to the end cover, a damping ring is installed between the adjusting screw and the end cover, and a transmission gear is fixedly connected to the bottom of the adjusting screw; a gear rod is passed through the inner shell, the gear rod is meshed with the transmission gear, and a tuning plate is installed on one end of the gear rod passing through the inner shell.

[0007] Furthermore, two first cavities are provided inside the outer shell, and the second cavity is provided between the two first cavities.

[0008] Furthermore, three resonant rods are provided in each of the first cavities.

[0009] Furthermore, a mounting base plate is fixedly connected to the bottom of the outer shell, and a plurality of mounting screw holes are provided on the mounting base plate.

[0010] Furthermore, heat dissipation grilles are provided on both sides of the outer shell.

[0011] Furthermore, the cover plate is provided with a plurality of tuning screw holes, and the inner threads of the tuning screw holes are connected with tuning screw rods which penetrate into the outer shell.

[0012] Furthermore, the plurality of tuning screws correspond one to one with the resonance rods.

[0013] The utility model filters microwaves through the internal tuning cavity, the tuning rod through the resonant rod, the first cavity and the second cavity, and divides the second cavity into different channels through the tuning plate arranged between the inner shell and the inner wall of the second cavity, forming an adjustable micro cavity, thereby playing the role of adjusting the filter. In the tuning process, the micro cavity can be controlled by operating the adjusting screw, so as to realize the tuning process more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the device structure;

[0015] Figure 2 is a cross-sectional view of the device;

[0016] Figure 3 Schematic diagram of the internal structure of the device;

[0017] In the figure: 1-outer shell; 101-first cavity; 102-second cavity; 11-heat dissipation grille; 12-mounting base plate; 121-mounting screw hole; 13-inner shell; 14-partitioning bar; 21-signal inlet; 22-signal outlet; 3-resonance rod; 4-cover plate; 41-tuning screw hole; 411-tuning screw; 5-tuning mechanism; 51-end cover; 52-adjusting screw; 53-damping ring; 54-transmission gear; 55-gear rod; 551-tuning plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] It should be noted that, in the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] See also Figure 1-Figure 3 The purpose of the utility model is to provide a bandpass cavity filter, comprising an outer shell 1 and a cover plate 4 detachably connected to the top of the outer shell 1, and the cover plate 4 is installed on the outer shell 1 by screwing. The inside of the outer shell 1 is separated by a first cavity 101 and a second cavity 102 by a partition bar 14. A resonance rod 3 is fixedly connected in the first cavity 101, and an inner shell 13 is fixedly connected in the second cavity 102; specifically, the top of the inner shell 13 is open, and a gap is left between the two sides of the inner shell 13 and the inner wall of the second cavity 102. A signal inlet 21 and a signal outlet 22 are respectively installed on the opposite sides of the outer shell 1.

[0023] A tuning mechanism 5 is installed on the cover plate 4, and the tuning mechanism 5 extends into the inner shell 13. The tuning mechanism 5 includes an end cover 51 fixedly connected to the cover plate 4, and the end cover 51 can match the opening at the top of the inner shell 13. When the cover plate 4 is installed on the top of the outer shell 1, the end cover 51 can cover the inner shell 13. An adjusting screw 52 is rotatably connected to the end cover 51, and a cross groove is provided on the top of the adjusting screw 52. The staff can rotate the adjusting screw 52 by a screwdriver tool. A damping ring 53 is installed between the adjusting screw 52 and the end cover 51. The damping ring 53 is used to provide rotation resistance between the adjusting screw 52 and the end cover 51 to prevent the adjusting screw 52 from rotating by itself due to vibration and other effects. The bottom of the adjusting screw 52 extends into the inner shell, and the bottom of the adjusting screw 52 is fixedly connected to a transmission gear 54. The inner housing 13 is provided with a gear rod 55. Specifically, the inner housing 13 is provided with mounting holes on both sides close to the inner wall of the second cavity 102. The gear rods 55 are slidably sleeved in the two mounting holes. The gear rods 55 can slide in the mounting holes of the inner housing 13. The gear rods 55 are meshed with the transmission gear 54. The rotation of the transmission gear 54 can drive the movement of the gear rods 55. One end of the gear rod 55 passing through the inner housing 13 is fixedly connected with a tuning plate 551. The tuning plate 551 can move between the inner housing 13 and the inner wall of the second cavity 102 under the drive of the gear rod 55.

[0024] Preferably, two first cavities 101 are disposed inside the outer shell 1 , and the second cavity 102 is disposed between the two first cavities 101 .

[0025] Preferably, three resonant rods 3 are provided in each of the two first cavities 101 .

[0026] Preferably, a mounting base plate 12 is fixedly connected to the bottom of the outer shell 1 , and a plurality of mounting screw holes 121 are provided on the mounting base plate 12 . The device can integrally mount the filter through the mounting base plate 12 with the mounting screw holes 121 .

[0027] Preferably, heat dissipation grilles 11 are provided on both sides of the outer shell 1, and the heat dissipation grilles 11 can increase the contact area with the air and increase heat dissipation.

[0028] Preferably, the cover plate 4 is provided with a plurality of tuning screw holes 41, and the tuning screw holes 41 are threadedly connected with tuning screws 411 that penetrate into the outer shell 1. Specifically, the tuning screws 411 are screwed into the cover plate 4 respectively, and the plurality of tuning screws 411 screwed on the cover plate 4 correspond to a resonance rod 3 respectively, which plays a role of tuning.

[0029] Thus, the microwave can be filtered through the internal tuning cavity, the tuning rod, the resonance rod 3, the first cavity 101 and the second cavity 102, and the second cavity 102 is divided into different channels by the tuning plate 551 arranged between the inner shell 13 and the inner wall of the second cavity 102, so as to form an adjustable micro cavity, thereby playing a role in adjusting the filter. In the tuning process, the micro cavity can be controlled by operating the adjusting screw 52, ​​so as to realize the tuning process more conveniently.

[0030] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A bandpass cavity filter, characterized in that: The device comprises an outer shell (1) and a cover plate (4) detachably connected to the top of the outer shell (1); the outer shell (1) is divided into a first cavity (101) and a second cavity (102) by a partition bar (14); a resonance rod (3) and an inner shell (13) are respectively installed in the first cavity (101) and the second cavity (102); and a signal inlet (21) and a signal outlet (22) are installed on the outer shell (1); The cover plate (4) is provided with an end cover (51) matched with the top of the inner shell (13); an adjusting screw (52) is rotatably connected to the end cover (51); a damping ring (53) is installed between the adjusting screw (52) and the end cover (51); a transmission gear (54) is fixedly connected to the bottom of the adjusting screw (52); a gear rod (55) is passed through the inner shell (13); the gear rod (55) is meshed with the transmission gear (54); and a tuning plate (551) is installed at one end of the gear rod (55) passing through the inner shell (13).

2. The bandpass cavity filter according to claim 1, characterized in that: Two first cavities (101) are provided inside the outer shell (1), and the second cavity (102) is provided between the two first cavities (101).

3. The bandpass cavity filter according to claim 2, characterized in that: Three resonant rods (3) are arranged in each of the first cavities (101).

4. The bandpass cavity filter according to claim 1, characterized in that: The bottom of the outer shell (1) is fixedly connected to a mounting base plate (12), and the mounting base plate (12) is provided with a plurality of mounting screw holes (121).

5. The bandpass cavity filter according to claim 1, characterized in that: Heat dissipation grilles (11) are provided on both sides of the outer shell (1).

6. The bandpass cavity filter according to claim 1, characterized in that: The cover plate (4) is provided with a plurality of tuning screw holes (41), and the tuning screw holes (41) are internally threadedly connected with tuning screw rods (411) that penetrate into the interior of the outer shell (1).

7. The bandpass cavity filter according to claim 6, characterized in that: The plurality of tuning screws (411) correspond one to one with the resonance rods (3).

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