Q-band broadband cavity filter

Abstract

The utility model relates to a Q-band broadband cavity filter, which comprises a shell, a partition plate, a plurality of groups of cavity adjusting assemblies, a signal input port and a signal output port, a top plate and a bottom plate of the shell are regular hexagons; the partition plates are arranged in the shell along the main diagonal lines of the regular hexagon of the bottom plate; the signal input port and the signal output port are arranged on the side wall of the shell on the lower layer of the two adjacent triangular cavities, and the two triangular cavities with the signal input port and the signal output port are completely isolated by a partition plate; a circular channel is reserved between any other two adjacent triangular cavity partition plates; each cavity in the shell is internally provided with a cavity adjusting assembly comprising a triangular tuning baffle, a spring and a tuning screw. The triangular tuning baffle divides the cavity into an upper layer and a lower layer; the spring and the tuning screw are arranged on the upper layer of the cavity; the tuning screw penetrates through the threaded through hole from the outside of the top plate of the shell, the lower surface of the tuning screw makes contact with the upper surface of the tuning baffle, and the height of the tuning baffle is adjusted through the screw.

Description

Technical Field

[0001] This utility model relates to the field of cavity filter technology, and in particular to a Q-band broadband cavity filter. Background Technology

[0002] Broadband communication technology is characterized by low power consumption, high bandwidth, and strong security. As an essential component of broadband communication systems, broadband bandpass filters have a significant impact on the overall performance of the communication system.

[0003] There are many types of bandpass filters, such as LC active filters and passive filters made of cavity, waveguide, and dielectric materials. Among them, cavity filters are widely used due to their low insertion loss and high power capacity.

[0004] Traditional broadband cavity filters use tuning screws to adjust the resonant frequency of the resonant cavity. The principle is to change the relative position of the screw and the upper surface or inner wall of the resonator by adjusting the depth of the screw inside the cavity, thereby changing the capacitance and thus altering the resonant frequency. However, existing traditional broadband cavity filters are often bulky, and the tuning screws inevitably cause metal debris to contaminate the cavity. Utility Model Content

[0005] Based on the above analysis, this utility model aims to provide a Q-band broadband cavity filter to solve the problems of existing broadband cavity filters being large in size and the inevitable metal debris contamination of the cavity caused by the cavity filter tuning bolts.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] A Q-band broadband cavity filter, characterized in that the cavity filter includes a housing, a partition, multiple sets of cavity adjustment components, a signal input port, and an output port;

[0008] The shell includes a regular hexagonal top plate, a bottom plate, and hexagonal annular sidewalls;

[0009] The partitions are arranged along the main diagonal of the regular hexagon of the bottom plate inside the shell, dividing the internal space of the shell into six triangular cavities; the signal input port and the output port are located on the shell side wall of the lower layer of two adjacent triangular cavities, and the two triangular cavities with signal input ports and output ports are completely isolated by the partitions; a coupling channel is left between the partitions of any other two adjacent triangular cavities.

[0010] Each cavity inside the housing is equipped with a set of chamber adjustment components; each set of chamber adjustment components includes a triangular tuning baffle, a spring, and a tuning screw; the triangular tuning baffle divides the cavity into upper and lower layers; the spring and tuning screw are located in the upper layer of the cavity; the upper and lower ends of the spring are respectively fixed to the inner surface of the top plate of the housing and the upper surface of the tuning baffle; a threaded through hole is provided at the center of the spring on the top plate of the housing, and the tuning screw passes through the threaded through hole from the outside of the top plate of the housing, so that the lower surface of the tuning screw contacts the upper surface of the tuning baffle, and the height of the tuning baffle is adjusted by the screw;

[0011] The coupling channel is a circular coupling channel set on the partition in the lower layer of the triangular cavity.

[0012] Furthermore, the partition includes a first partition and multiple second partitions;

[0013] The partition between two triangular cavities with signal input and output ports is the first partition; a second partition is provided between every other two adjacent triangular cavities.

[0014] The upper and lower surfaces of the first and second partitions are in contact with the top and bottom plates of the shell, respectively; the first and second partitions are both rectangular plates; each second partition is connected to the first partition at one end located at the center of the shell, and the other end of each second partition is in contact with the side wall of the shell; the second partition has a circular coupling channel at the center of the lower cavity.

[0015] Furthermore, the gap between the tuning baffle and the partition is 0.1mm-0.2mm.

[0016] Furthermore, the diameter of the circular coupling channel is 2.6 mm.

[0017] Furthermore, the partition is fixed to the inner surface of the bottom plate of the shell and is an integral structure with the shell.

[0018] Furthermore, the hexagonal side length of the upper and lower surfaces of the shell is 6.8 mm, the shell height is 8.5 mm, and the shell thickness is 0.5 mm.

[0019] Furthermore, the spring wire has a diameter of 0.1mm, an outer diameter of 0.8mm, and a length of 3.5mm.

[0020] Furthermore, the tuning screw is an M0.5×6 flathead screw.

[0021] Furthermore, the shell, partitions, and tuning baffles are made of copper.

[0022] Furthermore, the cavity filter also includes connectors; signal input connectors and output connectors are respectively provided in the signal input port and the output port.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] 1. The present invention relates to a Q-band broadband cavity filter comprising multiple cavity adjustment components, each cavity adjustment component comprising a tuning baffle, a spring, and a tuning screw; this structure can adjust the bandwidth of the cavity filter, and the design of the tuning baffle ensures that the tuning screw adjustment process does not cause metal debris to contaminate the lower cavity.

[0025] 2. This utility model discloses a Q-band broadband cavity filter. The top and bottom plates of the housing are regular hexagons of the same size, and the side walls are rectangular. A partition divides the interior of the housing into six equally sized triangular cavities. Except for the partition between the first and sixth triangular cavities, which completely isolates the two triangular cavities, a coupling channel is provided between the partitions of any other triangular cavities. The height of the upper layer of the cavity is adjustable, thus realizing a broadband cavity filter with an operating frequency band of 40-50GHz.

[0026] 3. This utility model discloses a Q-band broadband cavity filter. A partition is fixed to the lower bottom plate of the housing, and a tuning baffle is installed above the partition. The lower end of a spring is welded to the upper surface of the tuning baffle, and the upper end is welded to the inner surface of the top plate of the housing. A tuning screw, rotated from the outside, applies a downward force to the tuning baffle, causing it to move downwards. This is a broadband cavity filter with simple manufacturing process and low cost.

[0027] 4. This utility model discloses a Q-band broadband cavity filter, wherein the vertical distance between opposite sides of the regular hexagon on the top plate of the housing is w = 11.75 mm; and the length of the main diagonal of the regular hexagon on the top plate of the housing is l = 13.57 mm. It is a compact Q-band broadband cavity filter.

[0028] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0029] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0030] Figure 1 This is a schematic diagram of the structure of a Q-band broadband cavity filter after the top plate has been removed.

[0031] Figure 2This is a longitudinal cross-sectional view of a Q-band broadband cavity filter.

[0032] Figure 3 A schematic diagram of the appearance of a Q-band broadband cavity filter;

[0033] Figure 4 This is a schematic diagram of the exterior of a Q-band broadband cavity filter, including dimensions of the housing and partition.

[0034] Figure 5 This is a schematic diagram of the appearance and dimensions of a Q-band broadband cavity filter.

[0035] Figure label:

[0036] 1-Spring;

[0037] 2-First triangular cavity;

[0038] 3-First partition;

[0039] 4-Second partition;

[0040] 6-Input connector;

[0041] 7- Output connector;

[0042] 8-Tuning screw;

[0043] 9-Top plate;

[0044] 10 - Shell sidewall;

[0045] 11-Base plate;

[0046] 12-Tuning baffle. Detailed Implementation

[0047] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0048] A specific embodiment of this utility model discloses a Q-band broadband cavity filter, such as... Figure 1 As shown. The cavity filter includes a housing, a partition, multiple sets of cavity adjustment components, a signal input port, and an output port;

[0049] The shell includes a regular hexagonal top plate 9, a bottom plate 11, and a hexagonal annular sidewall 10;

[0050] The partition is arranged inside the shell along the main diagonal of the regular hexagon of the bottom plate 11, dividing the internal space of the shell into six triangular cavities; the signal input port and the output port are arranged on the shell side wall 10 of the lower layer of two adjacent triangular cavities, and the two triangular cavities with the signal input port and the output port are completely isolated by the partition; a coupling channel is left between the partitions of any other two adjacent triangular cavities.

[0051] Each cavity inside the housing is equipped with a set of chamber adjustment components; each set of chamber adjustment components includes a triangular tuning baffle 12, a spring 1, and a tuning screw 8; the triangular tuning baffle 12 divides the cavity into upper and lower layers; the spring 1 and the tuning screw 8 are located on the upper layer of the cavity; the upper and lower ends of the spring 1 are respectively fixed to the inner surface of the top plate 9 of the housing and the upper surface of the tuning baffle 12; a threaded through hole is provided at the center of the spring 1 on the top plate 9 of the housing, and the tuning screw 8 passes through the threaded through hole from the outside of the top plate 9 of the housing, so that the lower surface of the tuning screw 8 contacts the upper surface of the tuning baffle 12, and the height of the tuning baffle 12 is adjusted by the screw;

[0052] The coupling channel is a circular coupling channel set on the partition in the lower layer of the triangular cavity.

[0053] A schematic diagram of the appearance of a broadband cavity filter is shown below. Figure 3 As shown; longitudinal structural cross-sectional view as shown Figure 2 As shown.

[0054] Specifically, the top plate 9 and bottom plate 11 of the housing are hexagonal of the same size, and the sidewalls are rectangular. Partitions are fixed to the bottom plate 11, and the ends of each partition at the center of the housing are connected to each other. The tuning baffle 12 is a triangular plate, installed parallel to the bottom plate 11 above the partitions in the triangular cavity formed by two adjacent partitions and the sidewalls. Two sides of the triangular tuning baffle 12 are fitted to the two partitions respectively, with a certain gap between them. The other side of the triangular tuning baffle 12 is fitted to the sidewall of the triangular cavity with a certain gap. The lower end of the spring 1 is welded to the upper surface of the tuning baffle 12, and the upper end is welded to the inner surface of the top plate 9. A threaded through hole is provided at the center of the spring 1 on the top plate 9, and the tuning screw 8 passes through the threaded through hole from the outside of the top plate 9. By rotating the tuning screw 8 from the outside, the position of the tuning baffle 12 is adjusted, thereby changing the size of the lower cavity, thus forming resonant cavities of different frequencies and realizing a broadband cavity filter.

[0055] The partition includes a first partition 3 and multiple second partitions 4;

[0056] The partition between two triangular cavities with signal input and output ports is the first partition 3; a second partition 4 is provided between every other two adjacent triangular cavities.

[0057] The upper and lower surfaces of the first partition 3 and the second partition 4 are in contact with the top plate 9 and the bottom plate 11 of the shell, respectively; the first partition 3 and the second partition 4 are both rectangular plates; each second partition 4 and the first partition 3 are connected at one end located at the center of the shell, and the other end of each second partition 4 and the first partition 3 is in contact with the side wall 10 of the shell; the second partition 4 has a circular coupling channel at the center of the lower cavity.

[0058] The partition is fixed to the inner surface of the bottom plate 11 of the shell and is an integral structure with the shell.

[0059] Specifically, the longitudinal structural cross-sectional view is as follows: Figure 2 As shown. From Figure 2 It can be seen that the second partition 4 has a circular coupling channel located in the center of the horizontal direction of the partition in the lower cavity.

[0060] The diameter of the circular coupling channel is 2.6 mm.

[0061] In one specific embodiment of the present invention, the lowest point of the circular coupling channel is 0.5 mm away from the upper surface of the base plate 11.

[0062] The gap between the tuning baffle 12 and the partition is 0.1mm-0.2mm.

[0063] Specifically, the design spacing between the tuning baffle 12 and the partition is 0.1mm, and the machining negative tolerance is -0.05mm to 0mm. Therefore, the actual gap between the tuning baffle 12 and the partition is 0.1mm to 0.2mm, and no obvious metal shavings will be generated.

[0064] The shell has a side length of 6.8 mm for both the upper and lower hexagonal surfaces, a height of 8.5 mm, and a thickness of 0.5 mm.

[0065] The dimensions of the broadband cavity filter housing and partition are shown in the figure below. Figure 4 As shown.

[0066] Specifically, the vertical distance between opposite sides of the regular hexagon on the top plate 9 of the shell is w = 11.75 mm; the length of the main diagonal of the regular hexagon on the top plate 9 of the shell is l = 13.6 mm.

[0067] The thickness of both the first partition 3 and the second partition 4 is t = 0.3 mm.

[0068] The main view dimensions of the broadband cavity filter are shown below. Figure 5 As shown, the shell height is h = 8.5 mm.

[0069] The distance from the axis of the SMP RF coaxial connector to the lower surface of the housing base plate 11 is h' = 1.2 mm.

[0070] The cavity filter operates in the 40-50GHz frequency band.

[0071] Spring 1 has a wire diameter of 0.1mm, an outer diameter of 0.8mm, and a length of 3.5mm.

[0072] Tuning screw 8 is an M0.5×6 flathead screw.

[0073] Specifically, on the top plate 9 of the first to sixth triangular cavities, a threaded through hole is provided at the center of the spring 1. The tuning screw 8 is 6mm long and can stretch the spring 1.

[0074] The shell, partition, and tuning baffle 12 are made of copper.

[0075] Specifically, copper has high hardness, and the actual gap between the tuning baffle 12 and the partition is 0.1mm-0.2mm. No obvious metal shavings will be generated during the up-and-down movement of the tuning baffle 12.

[0076] The cavity filter also includes connectors; a signal input connector 6 and an output connector 7 are respectively provided in the signal input port and the output port.

[0077] Specifically, an SMP RF coaxial connector is provided in both the signal input port and the output port.

[0078] The microwave signal enters the broadband cavity filter from the signal input port, passes through the first triangular cavity 2 to the sixth triangular cavity in sequence, and is output from the SMP RF coaxial connector of the sixth triangular cavity to obtain the bandpass filtered microwave signal.

[0079] Compared with the prior art, the Q-band broadband cavity filter provided in this embodiment includes multiple cavity adjustment components, each of which includes a tuning baffle 12, a spring 1, and a tuning screw 8. This structure can adjust the bandwidth of the cavity filter, and the design of the tuning baffle 12 prevents metal debris from contaminating the lower cavity during the tuning screw adjustment process. The Q-band broadband cavity filter provided in this embodiment has a housing with a top plate 9 and a bottom plate 11 that are identical regular hexagons and rectangular sidewalls. A partition divides the interior of the housing into six equally sized triangular cavities. Except for the partition between the first triangular cavity 2 and the sixth triangular cavity, which completely isolates the two triangular cavities, coupling channels are provided between the partitions of any other triangular cavities. The height of the upper cavity is adjustable, realizing a broadband cavity filter with an operating frequency band of 40-50 GHz. This embodiment provides a Q-band broadband cavity filter. A partition is fixed to the lower base plate 11 of the housing. A tuning baffle 12 is installed above the partition. The lower end of a spring 1 is welded to the upper surface of the tuning baffle 12, and the upper end is welded to the inner surface of the top plate 9 of the housing. A tuning screw 8 applies a downward force to the tuning baffle 12 by rotating it from the outside, causing the tuning baffle 12 to move downwards. This is a broadband cavity filter with simple manufacturing process and low cost. In this embodiment, the vertical distance between opposite sides of the regular hexagon of the top plate 9 is w = 11.75 mm; the length of the main diagonal of the regular hexagon of the top plate 9 is l = 13.57 mm. This is a compact Q-band broadband cavity filter.

[0080] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Q-band broadband cavity filter, characterized in that, The cavity filter includes a housing, a partition, multiple sets of chamber adjustment components, a signal input port, and an output port; The shell includes a regular hexagonal top plate, a bottom plate, and hexagonal annular sidewalls; The partitions are arranged inside the shell along the main diagonal of the regular hexagon of the bottom plate, dividing the internal space of the shell into six triangular cavities; the signal input port and the output port are located on the shell side wall of the lower layer of two adjacent triangular cavities, and the two triangular cavities with signal input ports and output ports are completely isolated by the partitions; a coupling channel is left between the partitions of any other two adjacent triangular cavities. Each cavity inside the housing is equipped with a set of chamber adjustment components; each set of chamber adjustment components includes a triangular tuning baffle, a spring, and a tuning screw; the triangular tuning baffle divides the cavity into upper and lower layers; the spring and tuning screw are located in the upper layer of the cavity; the upper and lower ends of the spring are respectively fixed to the inner surface of the top plate of the housing and the upper surface of the tuning baffle; a threaded through hole is provided at the center of the spring on the top plate of the housing, and the tuning screw passes through the threaded through hole from the outside of the top plate of the housing, so that the lower surface of the tuning screw contacts the upper surface of the tuning baffle, and the height of the tuning baffle is adjusted by the screw; The coupling channel is a circular coupling channel set on the partition in the lower layer of the triangular cavity.

2. The broadband cavity filter according to claim 1, characterized in that, The partition includes a first partition and multiple second partitions; The partition between two triangular cavities with signal input and output ports is the first partition; a second partition is provided between every other two adjacent triangular cavities. The upper and lower surfaces of the first and second partitions are in contact with the top and bottom plates of the shell, respectively; both the first and second partitions are rectangular plates; each second partition is connected to the first partition at one end located at the center of the shell, and the other end of each second partition is in contact with the side wall of the shell; The second partition has a circular coupling channel located at the center of the lower cavity.

3. The broadband cavity filter according to claim 1, characterized in that, The gap between the tuning baffle and the partition is 0.1mm-0.2mm.

4. The broadband cavity filter according to claim 1, characterized in that, The diameter of the circular coupling channel is 2.6 mm.

5. The broadband cavity filter according to claim 1, characterized in that, The partition is fixed to the inner surface of the bottom plate of the shell and is an integral structure with the shell.

6. The broadband cavity filter according to claim 1, characterized in that, The shell has a side length of 6.8 mm for both the upper and lower hexagonal surfaces, a height of 8.5 mm, and a thickness of 0.5 mm.

7. The broadband cavity filter according to claim 1, characterized in that, The spring wire has a diameter of 0.1mm, an outer diameter of 0.8mm, and a length of 3.5mm.

8. The broadband cavity filter according to claim 1, characterized in that, The tuning screw is an M0.5×6 flathead screw.

9. The broadband cavity filter according to claim 2, characterized in that, The casing, partitions, and tuning baffles are made of copper.

10. The broadband cavity filter according to claim 2, characterized in that, The cavity filter also includes connectors; signal input connectors and output connectors are respectively provided in the signal input port and the output port.

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