A rectangular twisted waveguide that can be twisted at any angle

Abstract

The present invention discloses a rectangular twisted waveguide that can be twisted at any angle, relating to the field of high-power microwave and millimeter wave electronic technology. The rectangular twisted waveguide comprises an input rectangular waveguide, a "three-circular" twisted waveguide, and an output rectangular waveguide, which are arranged in sequence. The "three-circular" twisted waveguide is composed of a small circular hole in the middle and two large circular holes of equal size symmetrically arranged on both sides, and the three circular holes have the same thickness. The centers of the small circular hole and the two large circular holes are on the same straight line, which is the central axis, perpendicular to any cross-section of the electromagnetic wave transmission direction. The angles between the narrow side centerlines of the input rectangular waveguide and the output rectangular waveguide and the central axis are the same. The rectangular twisted waveguide of the present invention that can be twisted at any angle is applicable to different frequency bands, can reduce the size of the twisted waveguide, reduce production costs, and the twist angle of the twisted waveguide can be arbitrarily changed.

Description

Technical Field

[0001] The present invention relates to the technical field of high-power microwave and millimeter wave electronics, and in particular to a rectangular twisted waveguide that can be twisted at any angle. Background Art

[0002] A twist waveguide, also known as a twisted waveguide joint, consists of two standard waveguides with polarization directions intersecting by degrees. When an electromagnetic wave passes through it, the polarization direction changes by degrees, while the propagation direction remains unchanged. It is primarily used in waveguide systems and microwave devices in microwave and millimeter wave applications, such as communications and radar.

[0003] Traditional twist waveguides are commonly found in smooth-change 90° twist waveguides and stepped-change 90° twist waveguides. For waveguide systems or microwave devices where the polarization directions of the input and output rectangular waveguides intersect at any angle between 0 and 90°, traditional 90° twist waveguides no longer meet engineering requirements. Furthermore, smooth-change 90° twist waveguides, which twist a straight waveguide by 90°, have lengths that are integer multiples of λg / 2, with a minimum length of no less than 2λg. This has the disadvantages of being long, heavy, and costly per unit. Stepped-change 90° twist waveguides, constructed by stacking multiple steps, each approximately λg / 4 in length, offer advantages such as simple structure and ease of fabrication. However, performance is poor with fewer steps, while cost is high with more. Summary of the Invention

[0004] In view of the shortcomings of traditional twist waveguides in the prior art, the present invention proposes a rectangular twist waveguide that can be twisted at any angle to reduce the size of the twist waveguide and lower the production cost. The twist angle of the twist waveguide can be changed arbitrarily.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A rectangular twist waveguide capable of changing an arbitrary angle, characterized in that it comprises an input rectangular waveguide (1), a "three-circular" twist waveguide (2), and an output rectangular waveguide (3) which are arranged in sequence;

[0007] The "three-circular" twisted waveguide (2) is composed of a small circular hole in the middle and two large circular holes of the same size symmetrically arranged on both sides, and the three circular holes have the same thickness; in any cross section perpendicular to the direction of electromagnetic wave transmission, the centers of the small circular hole and the two large circular holes are on the same straight line, which is the central axis;

[0008] The angle between the narrow side center line of the input rectangular waveguide (1) and the central axis is θ, and the angle between the narrow side center line of the output rectangular waveguide (3) and the central axis is also θ, and the angle θ can be changed arbitrarily.

[0009] Preferably, along the electromagnetic wave transmission direction, the central axis of the input rectangular waveguide (1) and the output rectangular waveguide (3) coincides with the central axis of the "three-circular" twisted waveguide (2).

[0010] Preferably, the radius of the small circular hole is 0.25a-0.28a, and the radius of the large circular hole is 0.39a-0.42a, where a is the wide side dimension of the input rectangular waveguide and the output rectangular waveguide.

[0011] Preferably, the center distance between the large circular holes is 0.82 to 0.92a.

[0012] Preferably, the thickness of the "three-circular" twisted waveguide (2) is 0.18-0.21λg, where λg is the waveguide wavelength.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1) The structure of the present invention is small in size and the degree of twist of the twist waveguide can be arbitrarily changed, which can meet the requirements for small size and adjustable angle in engineering applications.

[0015] 2) The present invention reduces the thickness of the twist waveguide to about 0.18λg, which greatly reduces the structural size and weight of the twist waveguide compared to similar technologies.

[0016] 3) The present invention has a simple structure, is easy to process, and can be applied to different frequency bands. The specific size is determined by the corresponding frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the rectangular twist waveguide that can be changed at any angle in the embodiment.

[0018] Figure 2 Schematic diagram of the structure of the rectangular twist waveguide with different twist angles in the embodiment.

[0019] Figure 3 Graph showing the electric field distribution when the rectangular twisted waveguide is applied to the Q band in the embodiment.

[0020] Figure 4 This is a diagram showing the return loss simulation results when the rectangular twisted waveguide in the embodiment is twisted 0 to 90 degrees and applied to the Q band.

[0021] Figure 5 This is a diagram showing the return loss simulation results when the rectangular twisted waveguide in the embodiment is twisted 45 to 90 degrees and applied to the Q band.

[0022] Explanation of the reference numerals: 1. Input rectangular waveguide, 2. “Three-circular” twisted waveguide, 3. Output rectangular waveguide. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below with reference to a specific example and the accompanying drawings:

[0024] In this embodiment, the rectangular twist waveguide that can be twisted at any angle operates in a frequency range of 36 GHz to 50 GHz. Figure 1 A structural schematic diagram of this embodiment is provided, which includes an input rectangular waveguide (1), a "three-circular" twisted waveguide (2), and an output rectangular waveguide (3) arranged in sequence; along the electromagnetic wave transmission direction, the central axes of the input rectangular waveguide and the output rectangular waveguide coincide with the central axis of the "three-circular" twisted waveguide.

[0025] The input rectangular waveguide (1) and the output rectangular waveguide (3) both adopt the Q-band standard rectangular waveguide BJ400, with a size of a*b=5.69mm*2.845mm.

[0026] The thickness of the "three-circular" twisted waveguide (2) is h=1.8mm, and it is composed of a small circular hole with a radius r1=1.45mm in the middle and two large circular holes with a radius r2=2.25mm symmetrically arranged on both sides, and the center distance d between the two large circular holes is 4.9mm; in any cross section perpendicular to the direction of electromagnetic wave transmission, the centers of the small circular hole and the two large circular holes are on the same straight line, which is the central axis.

[0027] The angle between the narrow side center line of the input rectangular waveguide and the central axis is θ, and the angle between the narrow side center line of the output rectangular waveguide and the central axis is also θ. Figure 2 As shown, the angle θ can be changed arbitrarily, that is, the angle deg between the polarization directions of the input rectangular waveguide and the output rectangular waveguide can be changed arbitrarily.

[0028] Figure 3 This is the electric field distribution diagram of the twist waveguide applied to the Q band. It can be seen that the polarization direction of the electromagnetic wave is twisted by 90° when passing through the twist waveguide.

[0029] Figure 4 The return loss simulation results of the twisted waveguide when twisted 0 to 90 degrees and applied to the Q band are shown. It can be seen that in the 36-50GHz frequency band, for any angle θ, the return loss S of the twisted waveguide is 11 The parameter is always less than -20dB, and as the angle θ increases, the resonance point gradually moves to low frequencies.

[0030] Figure 5 The return loss simulation results of the twisted waveguide are shown in Figure 1. The return loss S of the twisted waveguide is simulated when the twisted waveguide is twisted 45 to 90 degrees and applied to the Q band. It can be seen that in the frequency band of 33.7-50GHz, for any angle θ, the return loss S of the twisted waveguide is 11 The parameter is always less than -20dB.

Claims

1. A rectangular twisted waveguide capable of changing any angle, characterized in that: It comprises an input rectangular waveguide (1), a "three-circular" twisted waveguide (2), and an output rectangular waveguide (3) which are arranged in sequence; Along the electromagnetic wave transmission direction, the central axis of the input rectangular waveguide (1) and the output rectangular waveguide (3) coincides with the central axis of the "three-circular" twisted waveguide (2); The "three-circular" twisted waveguide (2) is composed of a small circular hole in the middle and two large circular holes of the same size symmetrically arranged on both sides, and the three circular holes have the same thickness; in any cross section perpendicular to the direction of electromagnetic wave transmission, the centers of the small circular hole and the two large circular holes are on the same straight line, which is the central axis; The angle between the narrow side center line of the input rectangular waveguide (1) and the central axis is The angle between the narrow side center line of the output rectangular waveguide (3) and the central axis is also , and the angle Can be changed arbitrarily.

2. The rectangular twist waveguide capable of changing any angle as claimed in claim 1, characterized in that: The radius of the small circular hole is 0.25a~0.28a, and the radius of the large circular hole is 0.39a~0.42a, where a is the wide side size of the input rectangular waveguide and the output rectangular waveguide.

3. The rectangular twist waveguide capable of changing any angle as claimed in claim 2, wherein: The center distance between the large circular holes is 0.82~0.92a.

4. The rectangular twisted waveguide capable of changing any angle as claimed in claim 3, wherein: The thickness of the "three-circular" twisted waveguide (2) is 0.18-0.21λg, where λg is the waveguide wavelength.

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