Rectangular twisted waveguide capable of being twisted at any angle

Abstract

The invention discloses a rectangular twisted waveguide capable of being twisted at any angle, and relates to the technical field of high-power microwave and millimeter wave electronics. The rectangular twisted waveguide comprises an input rectangular waveguide, a three-circle-shaped twisted waveguide and an output rectangular waveguide which are arranged in sequence. The three-circle twisted waveguide is formed by superposing a small circular hole in the middle and two large circular holes which are symmetrically formed in the two sides and have the same size, the three circular holes have the same thickness and are perpendicular to any cross section in the electromagnetic wave transmission direction, the circle centers of the small circular hole and the two large circular holes are located on the same straight line, and the straight line is a circle center axis; the included angles between the narrow side center lines of the input rectangular waveguide and the output rectangular waveguide and the circle center axis are the same. The rectangular twisted waveguide capable of being twisted at any angle is applied to different frequency bands, the size of the twisted waveguide can be reduced, the production cost can be reduced, and the twisting angle of the twisted waveguide can be changed at any angle.

Description

Technical Field

[0001] The 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] Twist waveguide is also called waveguide twist joint. The two ends are standard waveguides with two polarization directions intersecting at degrees. When electromagnetic waves pass through it, the polarization direction changes degrees, and the propagation direction remains unchanged. It is mainly used in waveguide systems or microwave devices in microwave and millimeter wave fields such as communications and radar.

[0003] Traditional twist waveguides are commonly smooth-changing 90° twist waveguides and step-changing 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. In addition, the smooth-changing 90° twist waveguide is a straight waveguide that is directly twisted into 90°, with a length that is an integer multiple of λg / 2, and the shortest is not less than 2λg. It has the disadvantages of long overall length, high mass, and high unit production cost; the step-changing 90° twist waveguide is composed of multiple steps stacked together, each step is about λg / 4, and has the advantages of simple structure and easy processing, but when there are fewer steps, the performance is poor, and when there are more steps, the cost is high. Summary of the invention

[0004] In view of the shortcomings of the traditional twist waveguide 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 reduce the production cost, and 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 angle at any 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 electromagnetic wave transmission direction, the centers of the small circular hole and the two large circular holes are on the same straight line, and the straight line 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, the radius of the large circular hole is 0.39a-0.42a, and a is the wide side dimension of the input rectangular waveguide and the output rectangular waveguide.

[0011] Preferably, the center spacing of the large circular holes is 0.82-0.92a.

[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 changed arbitrarily, 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 a rectangular twist waveguide that can change at any angle in an 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 of the rectangular twisted waveguide applied to the Q band in the embodiment.

[0020] Figure 4 This is a graph 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 graph 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 twisted waveguide that can be twisted at any angle operates in the frequency range of 36 GHz to 50 GHz. Figure 1 A schematic structural diagram of the present embodiment is provided, comprising 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 and the output rectangular waveguide coincides 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 = 1.8 mm, and it is composed of a small circular hole with a radius r1 = 1.45 mm in the middle and two large circular holes with a radius r2 = 2.25 mm symmetrically arranged on both sides, and the distance between the centers of the two large circular holes is d = 4.9 mm; 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, and the straight line 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 in 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 result diagram of the twisted waveguide when twisted 0 to 90 degrees and applied to the Q band shows that in the 36-50 GHz frequency band, for any angle θ, the return loss S of the twisted waveguide 11 The parameter is always less than -20dB, and as the angle θ increases, the resonance point gradually moves to low frequency.

[0030] Figure 5 The return loss simulation result diagram of the twisted waveguide when twisted 45 to 90 degrees and applied to the Q band shows that in the frequency band of 33.7-50 GHz, for any angle θ, the return loss S of the twisted waveguide 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; 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 electromagnetic wave transmission direction, the centers of the small circular hole and the two large circular holes are on the same straight line, and the straight line is the central axis; 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.

2. A rectangular twisted waveguide capable of changing any angle as claimed in claim 1, characterized in that: Along the electromagnetic wave transmission direction, the central axes of the input rectangular waveguide (1) and the output rectangular waveguide (3) coincide with the central axis of the "three-circular" twisted waveguide (2).

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

4. A rectangular twisted waveguide capable of changing any angle as claimed in claim 3, characterized in that: The center distance of the large circular holes is 0.82-0.92a.

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

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