CN112928415B

CN112928415B - Medium composite type sub-terahertz dielectric waveguide transmission line

Info

Publication number: CN112928415B
Application number: CN202110265310.6A
Authority: CN
Inventors: 施金; 耿昕; 张凌燕; 刘栩; 徐凯; 郁梅
Original assignee: Nantong University; Nantong Research Institute for Advanced Communication Technologies Co Ltd
Current assignee: Nantong University; Nantong Research Institute for Advanced Communication Technologies Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2022-04-12
Anticipated expiration: 2041-03-11
Also published as: CN112928415A

Abstract

The invention discloses a dielectric composite type sub-terahertz dielectric waveguide transmission line, which is characterized in that two low-dielectric-constant circular cylinder dielectrics are alternately distributed along the radial direction, wherein the dielectric constants of adjacent dielectric cylinders are different, the dielectric constants of the dielectric cylinders at intervals are the same, and the dielectric constant of the innermost dielectric cylinder is greater than that of the next-inner dielectric cylinder. The dielectric waveguide transmission line can give consideration to the characteristics of size, dispersion and loss at the sub-terahertz working frequency band, and has the advantages of small size, low dispersion and low loss.

Description

Medium composite type sub-terahertz dielectric waveguide transmission line

Technical Field

The invention relates to a sub-terahertz dielectric waveguide transmission line.

Background

The sub-terahertz (sub-THz) transmission system is an important part of sixth-generation mobile communication, and is widely applied to the fields of remote sensing, radar, environmental monitoring, biomedicine and the like. In the sub-terahertz frequency band, the surface resistance of the metal of the transmission system is larger under the influence of the skin effect of the metal surface, so that the transmission system of a metal waveguide type has higher conductor loss, and the transmission system composed of pure medium has the advantages of reducing the loss and being easier to bend in structure.

The existing sub-terahertz frequency band dielectric waveguide transmission line comprises a photonic crystal waveguide and a traditional cylindrical dielectric waveguide. The photonic crystal waveguide depends on multilayer reflection of traveling waves in a cladding, the dispersion of the photonic crystal waveguide is small, but the photonic crystal waveguide has large transmission loss, a complex structure, difficulty in processing, far larger size than wavelength and a narrow working frequency band. Conventional cylindrical dielectric waveguides are relatively simple to process, can be close in diameter to the wavelength, but suffer from significant loss increase with decreasing diameter, and high dispersion.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the prior art, the dielectric composite type sub-terahertz dielectric waveguide transmission line is provided, and the effects of small size, low loss and low dispersion are achieved.

The technical scheme is as follows: a dielectric composite type sub-terahertz dielectric waveguide transmission line is characterized in that two kinds of circular cylindrical dielectrics with low dielectric constants are sequentially nested and compounded from inside to outside in an alternating mode to form a three-layer dielectric composite structure or a five-layer dielectric composite structure; the dielectric constant of the odd-numbered layer of circular column medium is smaller than that of the even-numbered layer of circular column medium from inside to outside along the radial direction; the dielectric waveguide transmission line works in the HE₁₁Mode, dielectric waveguide transmission lines have diameters between 0.9-1 wavelength.

Has the advantages that: the invention adopts the alternative distribution of two low dielectric constant circular column media along the radial direction, wherein the dielectric constants of the adjacent dielectric columns are different, the dielectric constants of the dielectric columns at the interval layer are the same, and the dielectric constant of the innermost dielectric column is larger than that of the next inner dielectric column. The dielectric waveguide transmission line can give consideration to the characteristics of size, dispersion and loss at the sub-terahertz working frequency band, and has the advantages of small size, low dispersion and low loss.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a transmission loss simulation chart of example 1;

fig. 3 is a simulation diagram of group delay of embodiment 1;

fig. 4 is a schematic structural view of embodiment 2.

Detailed Description

The invention is further explained below with reference to the drawings.

Example 1:

as shown in fig. 1, a dielectric composite type sub-terahertz dielectric waveguide transmission line is formed by alternately embedding and compounding two kinds of circular cylindrical dielectrics with low dielectric constants from inside to outside in sequence to form a three-layer dielectric composite structure. The dielectric constant of the annular column medium 1 at the odd number layer is smaller than that of the annular column medium 1 at the odd number layer from inside to outside along the radial directionThe dielectric constant of the annular column medium 2 on the even number layer and the dielectric constant of two medium materials are both less than 3.5, and the flexibility is good, such as polytetrafluoroethylene and foam, polyethylene and foam. Dielectric waveguide transmission line operating in HE₁₁Mode, the diameter of the dielectric waveguide transmission line is between 0.9-1 wavelength.

The dielectric waveguide transmission line of the present invention has a diameter slightly less than one wavelength and thus is small in size and operates in an HE₁₁Mode, a wider operating band can be obtained. The signal is transmitted along the axial direction in the dielectric waveguide transmission line, and the electric field in the dielectric waveguide is in stepped distribution by the alternate distribution of two dielectric circular columns with low dielectric constants, so that the dielectric absorption loss and the radiation loss can be reduced, the fluctuation of the group delay in the whole frequency band is improved, and the low dispersion working characteristic is obtained.

The diameter of the dielectric waveguide transmission line of the embodiment is 2mm, and the working frequency band can cover 127.5-152.5 GHz. As shown in FIG. 2, the loss range is 2.95-3.24 dB/m in the whole working frequency band; as shown in FIG. 3, the ratio of the maximum fluctuation of the group delay to the bandwidth is 0.352 ps/GHz/m, and the dispersion is low.

Example 2:

as shown in fig. 4, the difference from embodiment 1 is only that the dielectric waveguide transmission line is formed by alternately nesting and compounding two kinds of circular cylindrical dielectrics with low dielectric constants from inside to outside in sequence to form a five-layer dielectric composite structure, and the working mechanism of the five-layer dielectric composite structure is the same as that of embodiment 1, and the effect is similar.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A dielectric composite type sub-terahertz dielectric waveguide transmission line is characterized in that two kinds of circular column dielectrics with low dielectric constants are sequentially nested and compounded from inside to outside alternately to form a three-layer dielectric composite structure or a five-layer dielectric composite structure; from the inside to the outside in the radial direction, ofThe dielectric constant of the plurality of layers of circular column media is less than that of the even layer of circular column media; the dielectric waveguide transmission line works in the HE₁₁Mode, dielectric waveguide transmission lines have diameters between 0.9-1 wavelength.