Design method of Ka frequency band waveguide filter capable of 3D printing

Abstract

The invention discloses a design method of a Ka frequency band waveguide filter capable of 3D printing, the Ka frequency band waveguide filter comprises a pentagonal resonance body, and the pentagonal resonance body comprises a rectangular resonance body and a triangular resonance body which are integrally communicated; one end of the rectangular resonant body is integrally communicated with an input resonator, and the other end of the rectangular resonant body is integrally communicated with the output resonator; a plurality of electroplating holes are formed in the side wall, close to the vertex angle, of the triangular resonance body; the pentagonal resonator is divided into a plurality of pentagonal resonators by the metal diaphragms. According to the Ka-band waveguide filter provided by the invention, based on a metal 3D printing process, the plurality of electroplating holes are formed in the positions, close to the vertex angle, of the side wall of the triangular resonant body, so that electromagnetic waves are prevented from leaking, and the overall electrical performance of the filter is not influenced; and the liquid can fully flow in the Ka-band waveguide filter during later chemical electroplating of the Ka-band waveguide filter, so that the purpose of full electroplating is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of terrestrial and satellite communications, relates to a waveguide filter, and in particular to a design method for a 3D-printable Ka-band waveguide filter. Background Art

[0002] The manufacturing technology of satellite-borne microwave components based on 3D printing can save the use of consumables at the lowest cost and reduce the manufacturing cost of complex microwave devices. In addition, the integrated molding technology advantage of 3D printing is also an important means to achieve lightweight, integrated, and short-cycle design of payloads. Taking the development of the next generation of high-throughput flexible payload technology as an example, whether it is multi-beam feed arrays, traveling wave tube amplifiers, or MPA, Butler matrix, etc., 3D printing is urgently needed to achieve high integration and lightweight.

[0003] As satellite payloads have increasingly urgent requirements in terms of data rate, bandwidth, integration, and on-orbit reliability, the application prospects of millimeter wave and submillimeter wave systems are broad. However, working at millimeter wave frequencies also faces challenges, especially in the requirements for technical performance, integration, and cost in the millimeter wave radio front end. The filter is an important key device for signal transmission and selection in the millimeter wave front end. It can selectively pass electromagnetic signals and effectively suppress clutter signals, thereby ensuring the efficient and stable operation of the entire communication system. Therefore, it is very necessary to design high-performance filters. In the field of space microwave payloads, 3D printing manufacturing technology has been proven to be a viable solution for the development of waveguide components, which have improved performance, mechanical complexity, weight, and size. These include single waveguide components such as leaky wave antennas, waveguide transitions, orthogonal mode converters and polarizers, waveguide circuits, filters, and lightweight perforated structures manufactured by stereolithography and selective laser melting. The main advantage of additive manufacturing technology is the ability to integrate multiple RF functions (including radiation, phase shift, polarization, and frequency division multiplexing) in a single mechanical component. Some examples of microwave system integration enabled by 3D printing manufacturing technology include waveguide arrays with integrated waveguide filters, components with twisting, bending and filtering capabilities. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a 3D printable Ka-band waveguide filter design method to solve the technical problem in the prior art of ensuring that electromagnetic waves do not leak and do not affect the overall electrical performance of the filter, so that the liquid in the Ka-band waveguide filter can flow fully in the Ka-band waveguide filter during the later chemical electroplating to achieve sufficient electroplating.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A design method for a 3D-printable Ka-band waveguide filter, the structural design method of the Ka-band waveguide filter is as follows: the Ka-band waveguide filter comprises a pentagonal resonator, the pentagonal resonator comprises a rectangular resonator and a triangular resonator that are integrally connected, the cross-section of the rectangular resonator is a rectangle, and the cross-section of the triangular resonator is a triangle.

[0007] One end of the rectangular resonator is integrally connected to an input resonator, and the other end of the rectangular resonator is integrally connected to an output resonator; the input resonator is provided with two input RF waveguide interfaces, and the output resonator is provided with two output RF waveguide interfaces.

[0008] A metal diaphragm is vertically arranged at each of the two ends of the rectangular resonator, and a metal diaphragm is vertically arranged inside the rectangular resonator. The bottom end of the metal diaphragm is flush with the bottom end of the rectangular resonator, and the top end of the metal diaphragm does not contact the top end of the rectangular resonator; the metal diaphragm divides the pentagonal resonator into multiple pentagonal resonators.

[0009] The method also has the following technical features:

[0010] A plurality of electroplated holes are provided on the side wall of the triangular resonator near the top corner.

[0011] The diameter of the electroplated hole is less than 1 mm.

[0012] The vertex angle of the triangular resonator is less than 45°.

[0013] The pentagonal resonator is a pentagonal 1 / 2 wavelength waveguide resonator.

[0014] The Ka-band waveguide filter can control the coupling among the input resonator, the multiple pentagonal resonators and the output resonator by changing the height of the metal diaphragm.

[0015] The Ka-band waveguide filter is prepared by 3D printing technology.

[0016] The Ka-band waveguide filter is 3D printed along the length direction; the Ka-band waveguide filter can be 3D printed without support.

[0017] During the 3D printing process, the Ka-band waveguide filter is subjected to abrasive flow treatment using an abrasive flow process.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] (I) The Ka-band waveguide filter proposed in the present invention is based on a metal 3D printing process, and a plurality of electroplating holes are opened on the side wall of the triangular resonator near the top corner. On the basis of ensuring that electromagnetic waves do not leak and do not affect the overall electrical performance of the filter, the liquid in the Ka-band waveguide filter can flow fully in the Ka-band waveguide filter during the subsequent chemical electroplating, thereby achieving the purpose of sufficient electroplating.

[0020] (II) The Ka-band waveguide filter proposed in the present invention has a low density and weighs much less than a traditional machined filter, which is a great advantage in reducing the weight of the system.

[0021] (III) The Ka-band waveguide filter proposed in the present invention is printed in one piece and does not require frequency adjustment and coupling, which can reduce the design and manufacturing cycle of the filter and greatly improve the development cycle of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a 3D printable Ka-band waveguide filter simulation model.

[0023] Figure 2 Schematic diagram of a waveguide pentagonal resonator.

[0024] Figure 3 A schematic diagram of a plated hole on a pentagonal resonator.

[0025] The meanings of the numbers in the figure are: 1-pentagonal resonator, 2-rectangular resonator, 3-triangular resonator, 4-input resonator, 5-output resonator, 6-input RF waveguide interface, 7-output RF waveguide interface, 8-metal diaphragm, 9-pentagonal resonator, 10-electroplated hole.

[0026] The specific contents of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0027] It should be noted that, unless otherwise specified, all components and materials in the present invention are components and materials known in the prior art.

[0028] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0029] Example:

[0030] This embodiment provides a design method for a 3D printable Ka-band waveguide filter. Figure 1 and Figure 2As shown, the structural design method of the Ka-band waveguide filter is as follows: the Ka-band waveguide filter includes a pentagonal resonator 1, the pentagonal resonator 1 includes a rectangular resonator 2 and a triangular resonator 3 that are integrally connected, the cross-section of the rectangular resonator 2 is rectangular, and the cross-section of the triangular resonator 3 is triangular.

[0031] like Figure 1 As shown, one end of the rectangular resonator 2 is integrally connected to an input resonator 4, and the other end of the rectangular resonator 2 is integrally connected to an output resonator 5; two input RF waveguide interfaces 6 are provided on the input resonator 4, and two output RF waveguide interfaces 7 are provided on the output resonator 5.

[0032] like Figure 2 As shown, a metal diaphragm 8 is vertically arranged at each end of the rectangular resonator 2, and a metal diaphragm 8 is vertically arranged inside the rectangular resonator 2. The bottom end of the metal diaphragm 8 is flush with the bottom end of the rectangular resonator 2, and the top end of the metal diaphragm 8 does not contact the top end of the rectangular resonator 2; the metal diaphragm 8 divides the pentagonal resonator 2 into multiple pentagonal resonators 9.

[0033] like Figure 3 As shown, a plurality of electroplating holes 10 are provided on the side wall of the triangular resonator 3 near the top corner, and the diameter of the electroplating hole 10 is less than 1 mm. On the basis of ensuring that electromagnetic waves do not leak and do not affect the overall electrical performance of the filter, the liquid in the 3D printed filter can flow fully in the filter during the subsequent chemical electroplating, thereby achieving the purpose of sufficient electroplating.

[0034] In this embodiment, the vertex angle of the triangular resonator 3 is less than 45°.

[0035] In this embodiment, the pentagonal resonator 1 is a pentagonal 1 / 2 wavelength waveguide resonator.

[0036] In this embodiment, the Ka-band waveguide filter can control the coupling among the input resonator 4 , the plurality of pentagonal resonators 9 and the output resonator 5 by changing the height of the metal diaphragm 8 .

[0037] In this embodiment, the Ka-band waveguide filter is prepared by using a 3D printing process.

[0038] In this embodiment, the Ka-band waveguide filter is 3D printed along the length direction; the Ka-band waveguide filter can be 3D printed without support.

[0039] Specifically in this embodiment, the Ka-band waveguide filter adjusts the frequency by changing the length.

[0040] Specifically in this embodiment, when performing high-precision three-dimensional simulation of the electrical performance of the Ka-band waveguide filter, the required index is increased by 5dB to ensure that the performance of the printed filter meets the index requirements; the Ka-band waveguide filter adopts integrated three-dimensional simulation, the filter has no adjustment screws, and the frequency and coupling adjustment are exempted.

[0041] In this embodiment, during the 3D printing process, an abrasive flow process is used to perform abrasive flow treatment on the Ka-band waveguide filter.

Claims

1. A design method for a 3D printable Ka-band waveguide filter, characterized in that: The structural design method of the Ka-band waveguide filter is as follows: the Ka-band waveguide filter comprises a pentagonal resonator (1), the pentagonal resonator (1) comprises a rectangular resonator (2) and a triangular resonator (3) which are connected to each other in one piece, the cross section of the rectangular resonator (2) is a rectangle, and the cross section of the triangular resonator (3) is a triangle; One end of the rectangular resonator is integrally connected to an input resonator (4), and the other end of the rectangular resonator is integrally connected to an output resonator (5); the input resonator (4) is provided with two input radio frequency waveguide interfaces (6), and the output resonator (5) is provided with two output radio frequency waveguide interfaces (7); A metal diaphragm (8) is vertically arranged at each of the two ends of the rectangular resonator (2); a metal diaphragm (8) is vertically arranged inside the rectangular resonator (2); the bottom end of the metal diaphragm (8) is flush with the bottom end of the rectangular resonator (2), and the top end of the metal diaphragm (8) does not contact the top end of the rectangular resonator (2); the metal diaphragm (8) divides the pentagonal resonator (1) into a plurality of pentagonal resonators (9).

2. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: A plurality of electroplated holes (10) are provided on the side wall of the triangular resonator (3) near the top corner.

3. The design method of a 3D printable Ka-band waveguide filter according to claim 2, characterized in that: The diameter of the electroplated hole (10) is less than 1 mm.

4. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: The vertex angle of the triangular resonator (3) is less than 45°.

5. The design method of the 3D printable Ka-band waveguide filter according to claim 1, characterized in that: The pentagonal resonator (1) is a pentagonal 1 / 2 wavelength waveguide resonator.

6. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: The Ka-band waveguide filter can control the coupling between the input resonator (4), the plurality of pentagonal resonators (9) and the output resonator (5) by changing the height of the metal diaphragm (8).

7. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: The Ka-band waveguide filter is prepared by 3D printing technology.

8. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: The Ka-band waveguide filter is 3D printed along the length direction; the Ka-band waveguide filter can be 3D printed without support.

9. The design method of a 3D printable Ka-band waveguide filter according to claim 1, characterized in that: During the 3D printing process, the Ka-band waveguide filter is subjected to abrasive flow treatment using an abrasive flow process.

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