Novel waveguide polarization mode transition diaphragm structure applied in terahertz band

Abstract

The invention discloses a novel waveguide polarization mode transition diaphragm structure applied in terahertz band. The whole diaphragm is in a disc structure. Eight symmetrical circular holes are arranged around the center in the disc, wherein four large circular holes and four small circular holes are arranged with spacing. The specific center of location is equal to a standard flange UG387. The center can be provided with a coupling cavity according to needs. The novel waveguide polarization mode transition diaphragm structure provided by the invention has the advantages of simple processing and low processing cost. Missile-borne, satellite-borne and other microwave millimeter-wave systems have the device requirements of small size and light weight. The thickness of the monopole polarization twist waveguide provided by the invention is slightly greater than quarter wavelength. Due to small size, light weight and small standing wave and insertion loss, the working bandwidth can reach the whole band of waveguide. The diaphragm structure fully meets the function of electromagnetic wave polarization direction conversion in a small space structure, meets engineering needs, and has a high application value in bomb, spaceborne and other narrow band systems with harsh requirements on size and weight.

Description

technical field [0001] The invention relates to a terahertz circuit unit assembly, in particular to a novel waveguide polarization mode conversion membrane structure applied in the terahertz frequency band. Background technique [0002] In microwave, millimeter wave and lower frequency systems, such as figure 1 The traditional twisted waveguide structure is shown to change the polarization direction of electromagnetic waves. Waveguide bending is realized by using the plastic deformation of metal materials. When twisting, one end usually provides torsion, and the other end is fixed in the direction of rotation. When twisting, auxiliary materials need to be filled in the waveguide, or hollow twisting without filling any material Or heated hollow torsion. In order to reduce the inhomogeneity of the twisted section of the twisted waveguide, the length of the twisted section twisted by 90° is generally greater than 2 times the wavelength. The overall length of the twisted waveg...

AI Technical Summary

Problems solved by technology

In order to reduce the inhomogeneity of the twisted section of the twisted waveguide, the length of the twisted section twisted by 90° is generally greater than 2 times the wavelength. The overall length of the twisted waveguide, taking WR10 as an example, is generally greater than 20mm, which makes the system volume and weight relatively large

Moreover, due to the complex and difficult processing technology, the roughness of the inner surface, the dimensional accuracy and position tolerance of the waveguide inner cavity are not easy to guarantee, the quality stability is poor, and the processing cost is expensive, especially for the reliability of millimeter wave and submillimeter wave systems. big reliability impact

However, with the increase of the frequency, especially after the terahertz frequency band, the waveguide wavelength enters the micron level, and the traditional machining process is basically unable to process such a structure

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