Novel twisted waveguide phase delay line

Abstract

The invention belongs to the technical field of phase shifters and sub-terahertz-terahertz communication, and particularly provides a novel twisted waveguide phase delay line which is used for solving the problems that a traditional fixed phase delay line is low in working frequency, narrow in working frequency band, quite limited in application scene and the like. The phase delay line comprises a twisted waveguide composed of five waveguide sub-segments, and the twisted waveguide is formed by sequentially communicating a first straight waveguide sub-segment, a second twisted waveguide sub-segment, a third straight waveguide sub-segment, a fourth twisted waveguide sub-segment and a fifth straight waveguide sub-segment in the axial direction. The first straight waveguide sub-section and the fifth straight waveguide sub-section are standard rectangular waveguides; and compared with the second twisted waveguide sub-section, the first straight waveguide sub-section and the second twisted waveguide sub-section rotate at an angle of 43.7 degrees around the axis, and the fourth twisted waveguide sub-section and the second twisted waveguide sub-section are in mirror symmetry. According to the invention, the phase difference of the twisted waveguide is fitted to 90 degrees through the creative design of the waveguide torsion angle, so that the 90-degree broadband phase delay line in the whole WR-7 wave band is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of phase shifters and sub-terahertz-terahertz communication, and specifically provides a novel twisted waveguide phase delay line. Background Art

[0002] As a potential frequency band for realizing 6G technology, the terahertz frequency band has received a lot of attention in recent years. As a basic device in traditional microwave circuits, fixed-phase delay lines still play an important role in the terahertz frequency band. The combination of fixed-phase delay lines with 180° baluns and 90° bridges can convert the functions of the two into each other, so they are widely used in terahertz radars, communication systems, instrumentation, chip manufacturing and many other fields.

[0003] Waveguide fixed phase delay lines have the advantages of high quality factor and large power capacity. The micromachining process based on milling is also relatively easy to implement in the high frequency band. However, the previous phase delay lines had a low operating frequency and a narrow operating frequency band, and their application scenarios were very limited. Twist waveguides are a type of connecting waveguide widely used in microwave and millimeter wave component systems. However, twist waveguides were often used to convert the polarization direction of electromagnetic waves in the past, and few people paid attention to the phase changes in the waveguide. Summary of the invention

[0004] The purpose of the present 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 existing in traditional fixed phase delay lines; the present invention provides a broadband fixed phase delay line operating in the sub-terahertz frequency band, which has the advantages of wide bandwidth, low insertion loss, large power capacity and easy processing.

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

[0006] A novel twisted waveguide phase delay line, characterized in that the phase delay line comprises: a twisted waveguide composed of five waveguide sub-segments, the twisted waveguide is composed of a first straight waveguide sub-segment, a second twisted waveguide sub-segment, a third straight waveguide sub-segment, a fourth twisted waveguide sub-segment and a fifth straight waveguide sub-segment connected in sequence along the axial direction, and the waveguide sub-segments are cut and patched on the basis of a rectangular waveguide; the first straight waveguide sub-segment and the fifth straight waveguide sub-segment are standard rectangular waveguides, the second twisted waveguide sub-segment is rotated 43.7° around the axis compared with the first straight waveguide sub-segment, and the fourth twisted waveguide sub-segment and the second twisted waveguide sub-segment are mirror-symmetrical to each other.

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

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

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

[0010] Furthermore, the length of the third straight waveguide sub-segment is 1.17 mm, the wide side is 1.7 mm, and the narrow side is 0.9255 mm.

[0011] Furthermore, the novel twisted waveguide phase delay line operates in the WR-7 frequency band, and the phase difference in the entire WR-7 frequency band is 90°.

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

[0013] The present invention provides a novel twisted waveguide phase delay line. In the twisted waveguide, an additional phase is introduced when a rectangular waveguide is twisted. By creatively designing the waveguide twisting angle, the length of the twisted waveguide sub-segment and the length of the straight waveguide sub-segment are matched and designed, and the twisted waveguide equivalent length design is realized. The phase difference of the twisted waveguide is fitted to 90°, thereby realizing a 90° wide-band phase delay line in the entire WR-7 band. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 Schematic diagram of the structure of the bent waveguide phase delay line in the comparative example.

[0016] Figure 3 1 is a graph showing the S21 amplitude of the phase delay line in the embodiment of the present invention and the comparative example.

[0017] Figure 4 This is a diagram of the phase difference simulation results of the new twisted waveguide phase delay line in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

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

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

[0021] The first straight waveguide sub-segment and the fifth straight waveguide sub-segment are standard rectangular waveguides in the WR-7 band, and both have a length of 5 mm;

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

[0023] The height of the second twisted waveguide sub-segment after cutting and patching is 1.651 mm, the width is 1.7 mm, the width of the filled cavity is 0.656 mm, and the height is 0.8255 mm;

[0024] The third straight waveguide sub-segment has a length of 1.17 mm, a wide side of 1.7 mm, and a narrow side of 0.9255 mm;

[0025] The fourth twisted waveguide subsegment and the second twisted waveguide subsegment are mirror-symmetrical to each other.

[0026] The beneficial effects of the present invention are described in detail below in conjunction with simulation tests. At the same time, the present invention also provides a comparative example. Figure 2 As shown, it is specifically a curved waveguide phase delay line, whose overall length is 12.97 mm, which is equal to the length of the twist 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] The twisted waveguide in this embodiment and the bent waveguide in the comparative example both 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, thereby achieving a phase delay effect, and the phase difference is 90° in the entire WR-7 band. At the same time, the bent waveguide in the comparative example is of the same length as the twisted waveguide in this embodiment, and the phase difference is 90° in the entire WR-7 band.

[0028] Specifically, sub-terahertz wave signals are input from the input ports of the twist waveguide and the curved waveguide respectively, and are output from the output ports respectively after phase delay. The two output signals will have a 90° phase difference in the entire WR-7 band; Figure 3 The S21 amplitude curve of the twisted waveguide phase delay line in this embodiment and the bent waveguide phase delay line in the comparative example is shown as follows: Figure 4The figure shows the phase difference simulation result of the novel twisted waveguide phase delay line in the present invention. It can be seen from the figure that the insertion loss of the curved 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 in the entire working frequency band is within 90°±6°; in summary, the present invention provides a novel twisted waveguide phase delay line having the advantages of wide bandwidth, low insertion loss, large power capacity and easy processing.

[0029] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A novel twisted waveguide phase delay line, characterized in that: The phase delay line includes: a twisted waveguide composed of five waveguide sub-segments, wherein the twisted waveguide is composed of a first straight waveguide sub-segment, a second twisted waveguide sub-segment, a third straight waveguide sub-segment, a fourth twisted waveguide sub-segment and a fifth straight waveguide sub-segment connected in sequence along the axial direction; the first straight waveguide sub-segment and the fifth straight waveguide sub-segment are standard rectangular waveguides, the second twisted waveguide sub-segment is rotated 43.7° around the axis compared with the first straight waveguide sub-segment, and the fourth twisted waveguide sub-segment and the second twisted waveguide sub-segment are mirror-symmetrical to each other.

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

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

4. The novel twisted waveguide phase delay line according to claim 1, characterized in that: The length of the second twisted waveguide sub-segment is 0.9 mm. After being cut and patched, the height of the second twisted waveguide sub-segment is 1.651 mm and the width is 1.7 mm. The width of the filled cavity is 0.656 mm and the height is 0.8255 mm.

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

6. The novel twisted waveguide phase delay line according to claim 1, characterized in that: The novel twisted waveguide phase delay line operates in the WR-7 frequency band, and the phase difference in the entire WR-7 frequency band is 90°.

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