A torsional waveguide phase delay line

Abstract

The application belongs to the technical field of phase shifter and sub-terahertz-terahertz communication, and specifically provides a novel twist waveguide phase delay line to solve the problems of low working frequency, narrow working frequency band and limited application scenarios of traditional fixed phase delay line. The phase delay line in the application comprises a twist waveguide composed of five waveguide segments, the twist waveguide is sequentially communicated along the axial direction by a first straight waveguide segment, a second twist waveguide segment, a third straight waveguide segment, a fourth twist waveguide segment and a fifth straight waveguide segment, the first straight waveguide segment and the fifth straight waveguide segment are standard rectangular waveguides, the second twist waveguide segment is rotated by 43.7° around the axis compared with the first straight waveguide segment, and the fourth twist waveguide segment and the second twist waveguide segment are mirror-symmetric to each other. The application creatively designs the twist angle of the waveguide, fits the phase difference of the twist waveguide to 90°, and thus realizes the 90° wideband phase delay line in the whole WR-7 wave band.

Description

Technical Field

[0001] This invention belongs to the field of phase shifter and Asia-Pacific Hertz-Terahertz communication technology, specifically providing a novel twisted waveguide phase delay line. Background Technology

[0002] Terahertz frequency band has received much attention in recent years as a potential frequency band for realizing 6G technology. As a basic component in traditional microwave circuits, fixed phase delay line still plays an important role in the terahertz frequency band. The combination of fixed phase delay line with 180° balun and 90° bridge can enable the mutual conversion of their functions, and therefore it is widely used in many fields such as terahertz radar, communication systems, instrumentation and chip manufacturing.

[0003] Fixed-phase delay lines have the advantages of high quality factor and large power capacity. They are also relatively easy to implement in the high-frequency band using micromachining technology based on milling. However, the previous phase delay lines had low operating frequencies and narrow operating bands, which limited their application scenarios. Twisted waveguides are a type of connecting waveguide that is widely used in microwave and millimeter-wave component systems. However, in the past, twisted waveguides were often used to change the polarization direction of electromagnetic waves, and very few people paid attention to the phase changes in the waveguide. Summary of the Invention

[0004] The purpose of this invention is to provide a novel twisted waveguide phase delay line to solve the problems of low operating frequency, narrow operating frequency band, and very limited application scenarios of traditional fixed phase delay lines. This invention provides a broadband fixed phase delay line operating in the Asia-Pacific Hertz band, which has the advantages of wide bandwidth, low insertion loss, large power capacity, and easy processing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A novel twisted waveguide phase delay line is characterized in that the phase delay line comprises: a twisted waveguide consisting of five waveguide segments, wherein the twisted waveguide is formed by sequentially connecting a first straight waveguide segment, a second twisted waveguide segment, a third straight waveguide segment, a fourth twisted waveguide segment, and a fifth straight waveguide segment along the axial direction, and the waveguide segments are cut and patched on the basis of a rectangular waveguide; the first straight waveguide segment and the fifth straight waveguide segment are standard rectangular waveguides; the second twisted waveguide segment has a rotation angle of 43.7° around the axis compared to the first straight waveguide segment; and the fourth twisted waveguide segment is a mirror image of the second twisted waveguide segment.

[0007] Furthermore, the twisted waveguide has a length of 12.97 mm and a chamfer radius of 0.1 mm.

[0008] Furthermore, the lengths of both the first and fifth straight waveguide segments are 5 mm.

[0009] Furthermore, the length of the second twisted waveguide segment is 0.9 mm, the height of the second twisted waveguide segment after cutting and patching is 1.651 mm, the width is 1.7 mm, and the width of the filling cavity is 0.656 mm and the height is 0.8255 mm;

[0010] Furthermore, the third straight waveguide segment has a length of 1.17 mm, a width of 1.7 mm, and a narrow width of 0.9255 mm.

[0011] Furthermore, the novel twisted waveguide phase delay line operates in the WR-7 frequency band, with a phase difference of 90° throughout the WR-7 frequency band.

[0012] Based on the above technical solution, the beneficial effects of the present invention are as follows:

[0013] This invention provides a novel twisted waveguide phase delay line. In a twisted waveguide, an additional phase is introduced when the rectangular waveguide is twisted. By creatively designing the waveguide twist angle, the lengths of the twisted waveguide segments and the straight waveguide segments are matched and designed to achieve the equivalent length design of the twisted waveguide. The phase difference of the twisted waveguide is fitted to 90°, thereby realizing a 90° broadband phase delay line in the entire WR-7 band. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the novel twisted waveguide phase delay line in an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the phase delay line of the curved waveguide in the comparative example.

[0016] Figure 3 The diagram shows the S21 amplitude curve of the phase delay line in the embodiments and comparative examples of the present invention.

[0017] Figure 4 The figure shows the simulation results of the phase difference of the novel twisted waveguide phase delay line in the embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] This embodiment provides a novel twisted waveguide phase delay line, the structure of which is as follows: Figure 1 As shown, it specifically includes: a twisted waveguide composed of five waveguide segments, wherein the twisted waveguide is formed by sequentially connecting the first straight waveguide segment, the second twisted waveguide segment, the third straight waveguide segment, the fourth twisted waveguide segment, and the fifth straight waveguide segment along the axial direction; and, in order to meet the requirements of milling machine processing, the waveguide segments are cut and patched on the basis of the rectangular waveguide;

[0020] The overall length of the twisted waveguide is 12.97 mm, and the chamfer radius in the waveguide is 0.1 mm.

[0021] The first and fifth straight waveguide segments are standard rectangular waveguides in the WR-7 band, each with a length of 5 mm.

[0022] The second twisted waveguide segment is rotated about the axis by an angle of 43.7° compared to the first waveguide segment, and has a length of 0.9 mm;

[0023] The second twisted waveguide segment, after being cut and patched, has a height of 1.651 mm and a width of 1.7 mm, and the filling cavity has a width of 0.656 mm and a height of 0.8255 mm.

[0024] The third straight waveguide segment has a length of 1.17 mm, a width of 1.7 mm, and a narrow width of 0.9255 mm.

[0025] The fourth twisted waveguide segment is a mirror image of the second twisted waveguide segment.

[0026] The beneficial effects of the present invention will be described in detail below with reference to simulation tests. The present invention also provides a comparative example, such as... Figure 2 As shown, the specific feature is a curved waveguide phase delay line with an overall length of 12.97 mm, which is equal to the length of the twisted waveguide. The inner radius of the curved waveguide is 4.747 mm, the outer radius is 5.573 mm, and the chamfer radius is 3 mm.

[0027] In this embodiment, both the twisted waveguide and the curved waveguide in the comparative example operate in the WR-7 band. The electromagnetic wave mode of the standard rectangular waveguide is the TE10 mode. By changing the twist angle of the twisted waveguide, phase compensation is performed while the polarization direction changes, achieving a phase delay effect. The phase difference is 90° throughout the WR-7 band. Meanwhile, the curved waveguide in the comparative example is the same length as the twisted waveguide in this embodiment, and the phase difference is also 90° throughout the WR-7 band.

[0028] Specifically, the Asia-Pacific Hertz wave signals are input from the input ports of the twisted waveguide and the bent waveguide, respectively, and after phase delay, are output from the output ports. The two output signals will have a 90° phase difference throughout the WR-7 band; for example Figure 3 The figure shows the S21 amplitude curves of the tortuous waveguide phase delay line in this embodiment and the curved waveguide phase delay line in the comparative example. Figure 4The figure shows the simulation results of the phase difference of the novel twisted waveguide phase delay line of the present invention. As can be seen from the figure, the insertion loss of the bent waveguide is less than 0.05dB, the insertion loss of the twisted waveguide is less than 1dB, and the phase difference between the two paths is within 90°±6° across the entire operating frequency band. In summary, the present invention provides a novel twisted waveguide phase delay line with advantages such as wide bandwidth, low insertion loss, large power capacity, and easy processing.

[0029] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All disclosed features, or steps in all methods or processes, may be combined in any way except for mutually exclusive features and / or steps.

Claims

1. A twisted waveguide phase delay line, characterized in that, The phase delay line includes a twisted waveguide composed of five waveguide segments. The twisted waveguide is formed by sequentially connecting a first straight waveguide segment, a second twisted waveguide segment, a third straight waveguide segment, a fourth twisted waveguide segment, and a fifth straight waveguide segment along the axial direction. The first straight waveguide segment and the fifth straight waveguide segment are standard rectangular waveguides. The second twisted waveguide segment has a rotation angle of 43.7° around the axis relative to the first straight waveguide segment. The fourth twisted waveguide segment is a mirror image of the second twisted waveguide segment.

2. The twisted waveguide phase delay line according to claim 1, characterized in that, The twisted waveguide has a length of 12.97 mm and a chamfer radius of 0.1 mm.

3. The twisted waveguide phase delay line according to claim 1, characterized in that, The lengths of the first and fifth straight waveguide segments are both 5 mm.

4. The twisted waveguide phase delay line according to claim 1, characterized in that, The length of the second twisted waveguide segment is 0.9 mm, and the height of the second twisted waveguide segment after cutting and patching is 1.651 mm and the width is 1.7 mm. The width of the filling cavity is 0.656 mm and the height is 0.8255 mm.

5. The twisted waveguide phase delay line according to claim 1, characterized in that, The third straight waveguide segment has a length of 1.17 mm, a width of 1.7 mm, and a narrow width of 0.9255 mm.

6. The twisted waveguide phase delay line according to claim 1, characterized in that, The twisted waveguide phase delay line operates in the WR-7 frequency band, with a phase difference of 90° throughout the WR-7 frequency band.

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