A flypole coupled cavity filter

Abstract

The utility model relates to a kind of flying rod coupling cavity filters, including two resonant cavities, one resonant rod is provided in each resonant cavity, flying rod assembly is provided between two resonant cavities, the flying rod assembly includes two insulating clamping bases and a metal flying rod ring, two clamping bases are located at the line side of two resonant rods, the structure of the metal flying rod ring is symmetrical with the line of two resonant rods as symmetry axis mirror image, two sides of the metal flying rod ring each have a straight line segment, two straight line segments are connected on two clamping bases respectively.The utility model is coupled to two resonant rods by metal flying rod ring, not only increase coupling bandwidth range, and it is convenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to a flying rod coupled cavity filter. Background Technology

[0002] With the development of modern wireless communication and related industries, the demand for low insertion loss, high suppression filters and duplexers is increasing. Existing cavity filters typically employ a flybar between two resonant cavities to achieve cross-coupling, thereby suppressing out-of-band clutter. The cavity requires coupling windows to be created on the ribs, and then insulating brackets are attached to the ribs at the coupling windows. Current dumbbell flybar structures have a limited coupling bandwidth, achieving a range of only 10MHz-100MHz, making it difficult to cover coupling bandwidths greater than 100MHz.

[0003] Chinese patent CN221262678U discloses a fly rod assembly and a filter, including a fly rod and a fly rod seat. The fly rod has a through hole for a screw to pass through. The fly rod is partially embedded in the fly rod seat during injection molding. The fly rod seat has a shaft hole for clearance fitting with the screw, and the shaft hole of the fly rod seat passes through the fly rod. This fly rod structure is fixed, making replacement inconvenient.

[0004] Therefore, a new type of flying rod coupled cavity filter needs to be designed to avoid the above problems. Utility Model Content

[0005] The main purpose of this invention is to provide a flying rod coupled cavity filter that allows for a wider range of adjustment of the coupling bandwidth and is easy to replace.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a flying rod coupled cavity filter, comprising two resonant cavities, each resonant cavity containing a resonant rod, and a flying rod assembly between the two resonant cavities. The flying rod assembly includes two insulated brackets and a metal flying rod ring. The two brackets are located on both sides of the line connecting the two resonant rods. The structure of the metal flying rod ring is mirror-symmetrical about the line connecting the two resonant rods as the axis of symmetry. Each side of the metal flying rod ring has a straight line segment, and the two straight line segments are respectively connected to the two brackets.

[0007] Specifically, the card holder covers the straight segment.

[0008] Specifically, the card holder is provided with a slot for engaging the straight segment.

[0009] Specifically, an adjustment screw is provided at the center of the line connecting the two resonant rods. The axis of the adjustment screw is parallel to the axis of the resonant rod, and the adjustment screw passes through the interior of the metal fly rod ring.

[0010] Furthermore, the metal boom ring has a loop-shaped structure and includes two connecting sections, which are connected end-to-end to two straight sections.

[0011] Furthermore, the two connecting segments have a straight-line structure.

[0012] Furthermore, the connecting segment includes an arc section, the center of which is located on the axis of the resonant rod.

[0013] Furthermore, the metal fly rod ring has a C-shaped structure, and includes a connecting section and two short segments. The connecting section has a straight structure and its two ends are respectively connected to the same side of the two straight segments. The short segments have a straight structure and are parallel to the connecting section. The length of the broken segment is less than half the length of the connecting section.

[0014] The beneficial effects of this utility model's technical solution are: This invention couples two resonant rods using a metal flybar ring, which not only increases the coupling bandwidth but also facilitates replacement. Attached Figure Description

[0015] Figure 1 This is a partial top perspective view of the flying rod coupled cavity filter of Example 1; Figure 2 This is a perspective view of the fly stick assembly in Example 1; Figure 3 This is a partial top view of the flying rod coupled cavity filter of Example 2; Figure 4 This is a perspective view of the fly stick assembly in Example 2; Figure 5 This is a partial top view of the flying rod coupled cavity filter of Example 3.

[0016] The numbers in the diagram represent: 1-Resonant cavity, 11-Resonant rod; 2-Flying rod assembly, 21-Card holder, 211-Card slot, 22-Metal flying rod ring, 221-Straight section, 222-Connecting section, 2221-Arc-shaped part, 223-Short line segment; 3-Adjust the screw. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] Example 1: like Figure 1 and Figure 2As shown, this utility model discloses a fly-bar coupled cavity filter, comprising two resonant cavities 1, each resonant cavity 1 containing a resonant rod 11, and a fly-bar assembly 2 between the two resonant cavities 1. The fly-bar assembly 2 includes two insulated retainers 21 and a metal fly-bar ring 22. The two retainers 21 are located on both sides of the line connecting the two resonant rods 11. The structure of the metal fly-bar ring 22 is mirror-symmetrical about the line connecting the two resonant rods 11 as an axis of symmetry. Each side of the metal fly-bar ring 22 has a straight segment 221, which is connected to the two retainers 21 respectively. The retainers 21 cover the straight segments 221. The metal fly-bar ring 22 has a U-shaped structure and also includes two connecting segments 222, which are connected end-to-end to the two straight segments 222. The two connecting segments 222 have a straight structure.

[0019] In this embodiment, the coupling bandwidth ranges from 20MHz to 250MHz. The two mounting brackets 21 do not occupy the space between the two resonant rods 11, and ensure that the metal fly rod ring 22 lies flat. The metal fly rod ring 22 acts as a capacitor, coupling to each of the two resonant rods 11. Because the mounting brackets 21 are directly wrapped around the straight segment 222, the fly rod assembly 2 can be replaced as a single unit. The mounting brackets 21 can be made of insulating materials such as PTFE.

[0020] Example 2: like Figure 3 and Figure 4 As shown, the difference from Embodiment 1 is that the metal fly rod ring 22 has a C-shaped structure. The metal fly rod ring 22 also includes a connecting section and two short line segments. The connecting section has a straight structure and its two ends are respectively connected to the same side of the two straight line segments. The short line segments have a straight structure and are parallel to the connecting section. The length of the short line segments is less than half the length of the connecting section. The card holder 21 is provided with a slot 211 for engaging the straight line segment 221.

[0021] In this embodiment, the coupling bandwidth ranges from 30MHz to 200MHz. Because there is a slot 211 on the card holder 21, the metal fly rod ring 22 can be directly removed from the slot 211 and replaced, and the fly rod assembly 2 is only partially damaged. This structure of the card holder 21 can also be used in Embodiment 1 or Embodiment 3.

[0022] Example 3: like Figure 5 As shown, the difference from Embodiment 1 is that the connecting segment 222 includes an arc section 2221, the center of which is located on the axis of the resonant rod 11. An adjustment screw 3 is provided at the center of the line connecting the two resonant rods 11, the axis of which is parallel to the axis of the resonant rod 11, and the adjustment screw 3 passes through the interior of the metal fly rod ring 22.

[0023] In this embodiment, the coupling bandwidth ranges from 10MHz to 300MHz. Here, the arc-shaped portion 2221 is closer to the resonant rod 11, resulting in a larger capacitance. The adjustment screw 3 can be adjusted axially to change its opposing area with the resonant rod 11, thereby altering the capacitance value. The adjustment screw 3 can also be used in Embodiments 1 and 2.

[0024] In summary, this invention couples the two resonant rods 11 by means of a metal fly rod ring 22, which not only increases the coupling bandwidth range but also facilitates replacement.

[0025] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A flying rod coupled cavity filter, comprising two resonant cavities, each resonant cavity containing a resonant rod, and a flying rod assembly disposed between the two resonant cavities, characterized in that: The fly stick assembly includes two insulated brackets and a metal fly stick ring. The two brackets are located on both sides of the line connecting the two resonant rods. The structure of the metal fly stick ring is mirror-symmetrical about the line connecting the two resonant rods. Each side of the metal fly stick ring has a straight segment, and the two straight segments are respectively connected to the two brackets.

2. The flying rod coupled cavity filter according to claim 1, characterized in that: The card holder covers the straight segment.

3. The flying rod coupled cavity filter according to claim 1, characterized in that: The card holder is provided with a slot for engaging the straight segment.

4. The flying rod coupled cavity filter according to claim 1, characterized in that: A tuning screw is provided at the center of the line connecting the two resonant rods. The axis of the tuning screw is parallel to the axis of the resonant rod, and the tuning screw passes through the interior of the metal fly rod ring.

5. The flying rod coupled cavity filter according to claim 1 or 4, characterized in that: The metal boom ring has a loop-shaped structure and includes two connecting sections, which are connected to the two straight sections end to end.

6. The flying rod coupled cavity filter according to claim 5, characterized in that: The two connecting segments have a straight-line structure.

7. The flying rod coupled cavity filter according to claim 5, characterized in that: The connecting section includes an arc-shaped portion, the center of which is located on the axis of the resonant rod.

8. The flying rod coupled cavity filter according to claim 1 or 4, characterized in that: The metal boom ring has a C-shaped structure and includes a connecting section and two short segments. The connecting section has a straight structure and its two ends are respectively connected to the same side of the two straight segments. The short segments have a straight structure and are parallel to the connecting section. The length of the short segments is less than half the length of the connecting section.

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