Energy coupling device from metal circular waveguide to terahertz dielectric circular waveguide

Abstract

The invention discloses an energy coupling device from a metal circular waveguide to a terahertz dielectric circular waveguide. The energy coupling device comprises the metal circular waveguide, a dielectric hemisphere and a dielectric cylinder. The dielectric hemispheroid and the dielectric cylinder are arranged on the right side of the metal circular waveguide; the dielectric hemisphere is located in the metal circular waveguide; the medium cylinder is connected with the right end face of the metal circular waveguide. An electromagnetic signal in a quasi-Gaussian HE11 mode is input into the metal circular waveguide through the input end of the energy coupling device, and after energy coupling is carried out through the medium hemisphere, the coupled electromagnetic signal is transmitted into the terahertz medium circular waveguide through the output end of the energy coupling device by the medium cylinder. According to the energy coupling device, the high coupling efficiency, the wide working bandwidth and the high compactness of the structure are guaranteed, and meanwhile the machining and assembling difficulty of the structure can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave power transmission, and in particular relates to an energy coupling device between a metal circular waveguide and a terahertz medium circular waveguide. Background Art

[0002] In the application of space terahertz communication systems, in order to achieve the system's flexible spatial layout, broadband signal transmission, and payload through-cabin connection capabilities, terahertz dielectric circular waveguides with broadband and low-loss transmission characteristics are generally used to achieve flexible wired connections between components in the communication system.

[0003] Since the waveguide interface in the existing terahertz communication system is mostly in the form of a metal rectangular waveguide, and the terahertz dielectric circular waveguide structure usually transmits a hybrid mode HE11, which is similar to the quasi-Gaussian mode HE11 transmitted in the metal circular waveguide or the reflector antenna feed in the communication system, but the lateral components of the electric field components of the HE11 mode transmitted in the terahertz dielectric circular waveguide are not equal in amplitude, so the conventional TE10 to HE11 mode converter cannot achieve efficient coupling between the metal rectangular waveguide and the terahertz dielectric circular waveguide. To avoid confusion, the following content uses HE11' to represent the mode in the terahertz dielectric circular waveguide.

[0004] Emmanuel Decrossas et al. proposed a coupling device between a metal waveguide and a terahertz dielectric circular waveguide based on a dielectric lens, which achieved efficient interconnection between the metal waveguide and the terahertz dielectric circular waveguide. However, in order to ensure good transmission performance, the overall length of the coupling device is too long and the structure is relatively complex, which makes it difficult to process and realize it in the terahertz frequency band.

[0005] Since the HE11' mode transmitted in the terahertz dielectric circular waveguide has certain similarities with the HE11 mode in the circular waveguide or antenna feed, the energy coupling between the rectangular waveguide and the terahertz dielectric circular waveguide can be divided into two parts: rectangular waveguide TE10-circular waveguide HE11 and circular waveguide HE11-terahertz dielectric circular waveguide HE11', and designed separately. Among them, there are many coupling modes between the rectangular waveguide TE10 mode and the circular waveguide HE11 mode, and the technical means are mature, which have been studied and verified in the microwave and terahertz frequency bands, while the energy coupling structure between the circular waveguide HE11 and the terahertz dielectric circular waveguide HE11' has not been publicly reported. Summary of the invention

[0006] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art and provides an energy coupling device between a metal circular waveguide and a terahertz medium circular waveguide, which can realize efficient energy coupling between a metal circular waveguide and a terahertz medium circular waveguide in a wide band of the terahertz frequency band, and has the advantages of simple and compact structure, high energy coupling efficiency, wide working bandwidth, and easy processing.

[0007] In order to solve the above technical problems, the present invention discloses an energy coupling device from a metal circular waveguide to a terahertz dielectric circular waveguide, comprising: a metal circular waveguide, a dielectric hemisphere and a dielectric cylinder;

[0008] The dielectric hemisphere and the dielectric cylinder are arranged on the right side of the metal circular waveguide;

[0009] The dielectric hemisphere is located inside the metallic circular waveguide;

[0010] The dielectric cylinder is connected to the right end face of the metal circular waveguide.

[0011] In the energy coupling device between the above-mentioned metal circular waveguide and the terahertz dielectric circular waveguide, the energy coupling device serves as a connector between the quasi-Gaussian mode HE11 waveguide and the terahertz dielectric circular waveguide, with the input end on the left connected to the quasi-Gaussian mode HE11 waveguide and the output end on the right connected to the terahertz dielectric circular waveguide, for realizing mode conversion from the HE11 mode of the quasi-Gaussian mode HE11 waveguide to the HE11' mode of the terahertz dielectric circular waveguide.

[0012] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the electromagnetic signal of the quasi-Gaussian HE11 mode is input into the metal circular waveguide from the input end of the energy coupling device. After energy coupling is performed by the dielectric hemisphere, the dielectric cylinder transmits the coupled electromagnetic signal to the terahertz dielectric circular waveguide through the output end of the energy coupling device.

[0013] In the energy coupling device between the metal circular waveguide and the terahertz medium circular waveguide, the diameter of the metal circular waveguide is equal to the diameter of the dielectric hemisphere and is equal to the diameter of the terahertz medium circular waveguide core.

[0014] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the material of the dielectric hemisphere and the material of the dielectric cylinder are the same as the material of the terahertz dielectric circular waveguide core.

[0015] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the materials of the dielectric hemisphere, the dielectric cylinder and the terahertz dielectric circular waveguide core are all made of polypropylene PP.

[0016] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the diameter D of the dielectric cylinder is 1.2 to 1.5 times the core diameter of the terahertz dielectric circular waveguide.

[0017] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the dielectric hemisphere is coaxial and concentric with the right end face of the metal circular waveguide, and the distance between the center of the dielectric hemisphere and the center of the left end face of the metal circular waveguide is L.

[0018] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the dielectric hemisphere is coaxially and concentrically connected with the dielectric cylinder.

[0019] In the energy coupling device between the metal circular waveguide and the terahertz dielectric circular waveguide, the dielectric cylinder is coaxially and concentrically connected to the right end face of the metal circular waveguide.

[0020] The present invention has the following advantages:

[0021] (1) The present invention discloses an energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide. By utilizing the quasi-optical characteristics of terahertz waves and combining the principle of convex lenses, the invention realizes efficient energy coupling from a metal circular waveguide to a terahertz medium circular waveguide and effectively reduces the length of the energy coupling device.

[0022] (2) The present invention discloses an energy coupling device between a metal circular waveguide and a terahertz dielectric circular waveguide. By loading a dielectric cylinder, the coaxial flushing requirement between the dielectric hemisphere and the metal circular waveguide and the terahertz dielectric circular waveguide is effectively ensured, and the processing and assembly are relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an energy coupling device between a metal circular waveguide and a terahertz medium circular waveguide in an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the relative positions of a metal circular waveguide, a dielectric hemisphere, and a dielectric cylinder in an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a dielectric cylinder in an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the simulation results of the transmission characteristics of an energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Reference Figures 1 to 3 In this embodiment, the energy coupling device from the metal circular waveguide to the terahertz dielectric circular waveguide includes: a metal circular waveguide 1, a dielectric hemisphere 2 and a dielectric cylinder 3. The dielectric hemisphere 2 and the dielectric cylinder 3 are arranged on the right side of the metal circular waveguide 1; the dielectric hemisphere 2 is located in the metal circular waveguide 1; and the dielectric cylinder 3 is connected to the right end face of the metal circular waveguide 1.

[0029] In this embodiment, the energy coupling device serves as a connector between the quasi-Gaussian mode HE11 waveguide and the terahertz dielectric circular waveguide. The input end 4 on the left is connected to the quasi-Gaussian mode HE11 waveguide, and the output end 5 on the right is connected to the terahertz dielectric circular waveguide, so as to realize the mode conversion from the HE11 mode of the quasi-Gaussian mode HE11 waveguide to the HE11' mode of the terahertz dielectric circular waveguide. Specifically, when an electromagnetic signal of a quasi-Gaussian HE11 mode is input from the input end 4 of the energy coupling device into the metal circular waveguide 1, due to the matching between the metal circular waveguide 1 and the input end 4, most of the electromagnetic wave signals enter the metal circular waveguide 1, and the main mode transmitted in the metal circular waveguide 1 is the quasi-Gaussian mode HE11; the dielectric hemisphere 2 coaxially and concentrically with the metal circular waveguide 1 couples the electromagnetic wave transmitted thereto, and the transmission characteristics of the entire energy coupling device can be adjusted by adjusting the distance L between the center of the dielectric hemisphere 2 and the center of the left end face of the metal circular waveguide 1; finally, the dielectric cylinder 3 transmits the coupled electromagnetic signal to the terahertz dielectric circular waveguide through the output end 5 of the energy coupling device. Since the above structure is composed of a simple two-dimensional metal circle and a dielectric waveguide, the energy coupling device of the present invention can reduce the difficulty of processing and assembling the structure while ensuring high coupling efficiency, wide working bandwidth and high compactness of the structure.

[0030] In this embodiment, the diameter of the metal circular waveguide 1 is equal to the diameter of the dielectric hemisphere 2 , and is also equal to the diameter of the terahertz dielectric circular waveguide core.

[0031] In this embodiment, the material of the dielectric hemisphere 2 and the material of the dielectric cylinder 3 are the same as the material of the terahertz dielectric circular waveguide core. For example, the material of the terahertz dielectric circular waveguide core is polypropylene PP with a dielectric constant of 2.26. ； The material of the dielectric hemisphere 2 and the dielectric cylinder 3 is also polypropylene PP 。

[0032] In this embodiment, the diameter D of the dielectric cylinder 3 is 1.2 to 1.5 times the diameter of the terahertz dielectric circular waveguide core, and can be appropriately adjusted according to the requirements of the structural transmission characteristics. It should be noted that the larger the diameter D is, the greater the electromagnetic signal leakage is.

[0033] In this embodiment, the dielectric hemisphere 2 is coaxial and concentric with the right end face of the metal circular waveguide 1, and the distance between the center of the dielectric hemisphere 2 and the center of the left end face of the metal circular waveguide 1 is L. Preferably, the distance L is substantially equal to the focal length of the hemispherical convex lens of the same radius, and can be appropriately adjusted according to the reflection characteristic requirements of the entire energy coupling device.

[0034] In this embodiment, the dielectric hemisphere 2 and the dielectric cylinder 3 are coaxially and concentrically connected.

[0035] In this embodiment, the dielectric cylinder 3 is coaxially and concentrically connected to the right end face of the metal circular waveguide 1, and its thickness t is usually 0.5 to 1 times the wavelength of the central operating frequency, which can be appropriately adjusted according to the processing technology and mechanical strength requirements.

[0036] Based on the above embodiment, a specific example is described below.

[0037] The present invention discloses an energy coupling device between a metal circular waveguide and a terahertz dielectric circular waveguide, wherein the left end of the metal circular waveguide is used as an input end 4, the right end of a dielectric cylinder is used as an output end 5, and the central operating frequency is 220 GHz. The energy coupling device comprises: a metal circular waveguide 1, a dielectric hemisphere 2 and a dielectric cylinder 3. Figure 4 As shown, it can be seen that the energy coupling device described in the present invention has good microwave transmission characteristics in the range of 200-227GHz.

[0038] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0039] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. An energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide, characterized in that: include: A metal circular waveguide (1), a dielectric hemisphere (2) and a dielectric cylinder (3); The dielectric hemisphere (2) and the dielectric cylinder (3) are arranged on the right side of the metal circular waveguide (1); The dielectric hemisphere (2) is located inside the metal circular waveguide (1); The dielectric cylinder (3) is connected to the right end surface of the metal circular waveguide (1).

2. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 1, characterized in that: The energy coupling device serves as a connector between a quasi-Gaussian mode HE11 waveguide and a terahertz medium circular waveguide, wherein the input end (4) on the left is connected to the quasi-Gaussian mode HE11 waveguide, and the output end (5) on the right is connected to the terahertz medium circular waveguide, and is used to realize mode conversion from the HE11 mode of the quasi-Gaussian mode HE11 waveguide to the HE11' mode of the terahertz medium circular waveguide.

3. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 2, characterized in that: An electromagnetic signal in a quasi-Gaussian HE11 mode is input into a metal circular waveguide (1) from an input end (4) of an energy coupling device, and after energy coupling is performed by a dielectric hemisphere (2), the coupled electromagnetic signal is transmitted by a dielectric cylinder (3) to a terahertz dielectric circular waveguide via an output end (5) of the energy coupling device.

4. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 2, characterized in that: The diameter of the metal circular waveguide (1) is equal to the diameter of the dielectric hemisphere (2), and is also equal to the diameter of the terahertz dielectric circular waveguide fiber core.

5. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 2, characterized in that: The material of the dielectric hemisphere (2) and the material of the dielectric cylinder (3) are the same as the material of the terahertz dielectric circular waveguide fiber core.

6. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 5, characterized in that: The materials of the dielectric hemisphere (2), the dielectric cylinder (3) and the terahertz dielectric circular waveguide core are all polypropylene (PP).

7. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 2, characterized in that: The diameter D of the dielectric cylinder (3) is 1.2 to 1.5 times the diameter of the terahertz dielectric circular waveguide fiber core.

8. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 1, characterized in that: The dielectric hemisphere (2) is coaxial and concentric with the right end face of the metal circular waveguide (1), and the distance between the center of the dielectric hemisphere (2) and the center of the left end face of the metal circular waveguide (1) is L.

9. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 1, characterized in that: The dielectric hemisphere (2) and the dielectric cylinder (3) are coaxially and concentrically connected.

10. The energy coupling device from a metal circular waveguide to a terahertz medium circular waveguide according to claim 1, characterized in that: The dielectric cylinder (3) is coaxially and concentrically connected to the right end surface of the metal circular waveguide (1).

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