A carrier for circular polarization testing of a dihedral angle structure

Abstract

The present invention provides a carrier for circular polarization testing of a dihedral angle structure, which is applied to the technical field of electromagnetic wave polarization testing. The carrier is an integrally formed structure. The carrier has a support surface, and a fixing part for supporting the dihedral angle structure is arranged on the support surface. The included angle between the dihedral angle structure located on the support surface and the horizontal plane is 45°. The carrier for circular polarization testing of the dihedral angle structure provided by the present invention can improve the support stability of the dihedral angle structure and ensure the accuracy of the RCS characteristic measurement of the dihedral angle structure.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic wave polarization testing, and particularly relates to a carrier for circular polarization testing of a dihedral structure. Background Art

[0002] The dihedral structure is a relatively common configuration on stealth aircraft. The dihedral structure includes two intersecting flat plates, and an included angle is formed between the two flat plates. The dihedral structure has different RCS (Radar Cross-Section) characteristics under different polarization modes (such as horizontal polarization, vertical polarization, and circular polarization). When performing circular polarization testing on the dihedral structure, the dihedral structure needs to be set at an angle of 45° relative to the horizontal plane.

[0003] In the related art, usually, a plurality of small-sized low-scattering bodies (such as low-scattering bodies made of foam) are laid under the dihedral structure, so that the dihedral structure is inclined at an angle of 45° relative to the horizontal plane. However, this method not only results in poor support stability of the dihedral structure, but also increases the reflection of electromagnetic waves by the low-scattering bodies due to the gaps between the plurality of low-scattering bodies, thereby making the measurement of the RCS characteristics of the dihedral structure inaccurate.

[0004] Therefore, there is an urgent need for a carrier for circular polarization testing of a dihedral structure to solve the above technical problems. Summary of the Invention

[0005] The embodiment of the present invention provides a carrier for circular polarization testing of a dihedral structure, which can improve the support stability of the dihedral structure and ensure the accuracy of the measurement of the RCS characteristics of the dihedral structure.

[0006] The present invention provides a carrier for circular polarization testing of a dihedral structure. The carrier is an integrally formed structure. The carrier has a support surface, and a fixing portion for supporting the dihedral structure is provided on the support surface. The included angle between the dihedral structure located on the support surface and the horizontal plane is 45°.

[0007] Preferably, the support surface is an inclined surface having an included angle with the horizontal plane.

[0008] Preferably, the support surface is perpendicular to the angular bisecting plane of the dihedral structure.

[0009] Preferably, the fixing portion is a groove, and the groove is formed by inward extension of a part of the support surface.

[0010] Preferably, the groove penetrates through the support surface and the side surface of the carrier, and the two flat plates of the dihedral structure extend beyond the side surface.

[0011] Preferably, the side surface is a curved surface.

[0012] Preferably, the cross-sectional area of the side surface gradually decreases in the direction from bottom to top.

[0013] Preferably, the carrier is made of a wave-transparent foam.

[0014] Preferably, the center of gravity of the dihedral angle structure and the center of gravity of the carrier are located on the same vertical line.

[0015] Preferably, the two flat plates of the dihedral angle structure are square;

[0016] The fact that the center of gravity of the dihedral angle structure and the center of gravity of the carrier are located on the same vertical line is determined in the following manner:

[0017] When the center of gravity of the dihedral angle structure in the horizontal placement and the center of gravity of the carrier are located on the same vertical line, the groove is in the first position;

[0018] When the center of gravity of the dihedral angle structure in the inclined placement and the center of gravity of the carrier are located on the same vertical line, the groove is in the second position;

[0019] Assume that the geometric center of the groove when it is in the first position and the center of gravity of the carrier are located on the same vertical line, and the geometric center of the groove when it is in the second position and the center of gravity of the carrier are located on the same vertical line;

[0020] Take the horizontal distance between the center of gravity of the dihedral angle structure in the horizontal placement and the center of gravity of the dihedral angle structure in the inclined placement as the horizontal distance between the geometric center of the groove when it is in the first position and the geometric center of the groove when it is in the second position;

[0021] Based on the horizontal distance between the geometric center of the groove when it is in the first position and the geometric center of the groove when it is in the second position, determine the second position where the groove is located, so that the center of gravity of the dihedral angle structure and the center of gravity of the carrier are located on the same vertical line.

[0022] The present invention has at least the following beneficial effects compared with the prior art:

[0023] In the present invention, by setting the carrier for the circular polarization test of the dihedral angle structure as an integrally formed structure, no gap is generated inside the carrier, thereby making the circular polarization test result of the dihedral angle structure more accurate; on the basis that the carrier is an integrally formed structure, a fixing part is simultaneously provided on the supporting surface, so that the support of the carrier can be more stable. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the application of a carrier-fixed dihedral angle structure provided by an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of a carrier provided by an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the positional relationship between the horizontal placement and the 45° inclination placement of a dihedral angle structure provided by an embodiment of the present invention;

[0028] Figure 4 It is one provided by an embodiment of the present invention according to Figure 3 A schematic diagram of the auxiliary line of the center of gravity change extracted;

[0029] Figure 5 It is a top view of a dihedral angle structure provided by an embodiment of the present invention.

[0030] In the figure:

[0031] 1. Carrier;

[0032] 11. Support surface;

[0033] 111. Groove;

[0034] 2. Dihedral angle structure;

[0035] G1. The position of the center of gravity when the dihedral angle structure is horizontally placed;

[0036] G2. The position of the center of gravity when the dihedral angle structure is inclined. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present invention are described from the angles shown in the drawings and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0040] As Figure 1 and Figure 2 shown, the present invention provides a carrier 1 for circular polarization testing of a dihedral angle structure 2. The carrier 1 is an integrally formed structure. The carrier 1 has a support surface 11, and a fixing portion for supporting the dihedral angle structure 2 is provided on the support surface 11. The angle between the dihedral angle structure 2 located on the support surface 11 and the horizontal plane is 45°.

[0041] In the present invention, by setting the carrier 1 for circular polarization testing of the dihedral angle structure 2 as an integrally formed structure, no gap is generated inside the carrier 1, thereby making the circular polarization test result of the dihedral angle structure 2 more accurate; on the basis that the carrier 1 is an integrally formed structure, a fixing portion is simultaneously provided on the support surface 11, so that the support of the carrier can be more stable.

[0042] It should be noted that there is an angle of 45° between the dihedral angle structure 2 and the horizontal plane, and this angle is obtained by rotating the dihedral angle structure 2 by 45° around any straight line parallel to the angle bisector in the horizontal placement state.

[0043] According to some preferred embodiments, as Figure 2 shown, the fixing portion is a groove 111, and the groove 111 is formed by inward extension of a part of the support surface 11.

[0044] It can be understood that after the groove 111 is recessed inward, it is lower than the original support surface 11. Of course, the groove 111 can also be formed by first protruding upward and then recessing inward to form a groove 111 higher than the original support surface 11.

[0045] In the present invention, the groove 111 includes two linear grooves 111 whose endpoints intersect. One groove 111 is used to fix one flat plate of the dihedral angle structure 2, and the other groove 111 is used to fix the other flat plate of the dihedral angle structure 2.

[0046] According to some preferred embodiments, the supporting surface 11 is an inclined surface that forms an angle with the horizontal plane.

[0047] In the present invention, the supporting surface 11 is inclined with respect to the horizontal plane, so that the acute angle between the bottom surface of the dihedral angle structure 2 and the supporting surface 11 is small. The small acute angle enables the groove 111 to have excellent supporting stability even when the depression depth is small.

[0048] It should be noted that the small depression depth of the groove 111 can reduce the shielding of the carrier 1 from the dihedral angle structure 2, reduce the interference of the carrier 1 on the circular polarization test of the dihedral angle structure 2, improve the accuracy of the circular polarization test result of the dihedral angle structure 2, and thus better reflect the stealth effect of the dihedral angle structure 2 in the installed state.

[0049] According to some preferred embodiments, the supporting surface 11 is perpendicular to the angular bisecting plane of the dihedral angle structure 2.

[0050] In the present invention, the supporting surface 11 is perpendicular to the angular bisecting plane of the dihedral angle structure 2, making the bottom surface of the dihedral angle structure 2 parallel to the supporting surface 11. The parallelism between the bottom surface of the dihedral angle structure 2 and the supporting surface 11 makes the groove 111 have the same depression depth. Such a setting enables the groove 111 to not only fix the dihedral angle structure 2 but also reduce the shielding of the dihedral angle structure 2.

[0051] According to some preferred embodiments, the groove 111 penetrates through the supporting surface 11 and the side surface of the carrier 1, and the two flat plates of the dihedral angle structure 2 extend beyond the side surface.

[0052] It can be understood that the lateral dimension of the dihedral angle structure 2 is larger than the lateral dimension of the carrier 1. Such a setting makes the volume of the carrier 1 smaller than the volume of the dihedral angle structure 2, which can reduce the scattering generated by the carrier 1 and further reduce its interference on the circular polarization test result of the dihedral angle structure 2.

[0053] According to some preferred embodiments, the side surface is a curved surface.

[0054] In the present invention, the side surface being a curved surface can disperse the scattering generated when electromagnetic waves are incident on the carrier 1 in all directions, thereby improving the accuracy of the circular polarization test result.

[0055] According to some preferred embodiments, the cross-sectional area of the side surface gradually decreases in the direction from bottom to top.

[0056] In the present invention, the side surface is bent in the vertical direction, causing the electromagnetic wave to scatter in the vertical direction, thereby improving the accuracy of the circular polarization test results. Of course, increasing the cross-sectional area of the side surface in the direction from bottom to top can also achieve the same effect of improving the accuracy of the circular polarization test results, but it will reduce the support stability of the carrier 1.

[0057] According to some preferred embodiments, the carrier 1 is made of a wave-transparent foam.

[0058] In the present invention, using a wave-transparent foam to make the carrier 1 allows most of the electromagnetic waves to pass through the carrier 1, reducing the reflection and scattering generated by the carrier 1, thereby reducing the interference of the carrier 1 on the circular polarization test of the dihedral structure 2 and improving the accuracy of the circular polarization test results of the dihedral structure 2, so as to better reflect the stealth effect of the dihedral structure 2 in the installed state.

[0059] According to some preferred embodiments, the center of gravity of the dihedral structure 2 and the center of gravity of the carrier 1 are located on the same vertical line.

[0060] It can be understood that the center of gravity of the dihedral structure 2 and the center of gravity of the carrier 1 being located on the same vertical line makes the whole formed by the carrier 1 and the dihedral structure 2 more stable and not prone to tipping over. The mass of the dihedral structure 2 is much larger than the mass of the carrier 1. Fixing the dihedral structure 2 with a large mass on the carrier 1 with a small mass will cause a situation of top-heavy and bottom-light, making it easy to tip over. Setting the centers of gravity of the two on the same vertical line can improve the stability of their combination.

[0061] According to some preferred embodiments, the two flat plates of the dihedral structure 2 are square;

[0062] The center of gravity of the dihedral structure 2 and the center of gravity of the carrier 1 being located on the same vertical line is determined in the following manner:

[0063] When the center of gravity of the dihedral structure 2 in the horizontal placement and the center of gravity of the carrier 1 are located on the same vertical line, the groove 111 is in the first position;

[0064] When the center of gravity of the dihedral structure 2 in the inclined placement and the center of gravity of the carrier 1 are located on the same vertical line, the groove 111 is in the second position;

[0065] Assume that the geometric center of the groove 111 in the first position is on the same vertical line as the center of gravity of the carrier 1, and the geometric center of the groove 111 in the second position is on the same vertical line as the center of gravity of the carrier 1;

[0066] Take the horizontal distance between the center of gravity of the dihedral angle structure 2 when it is placed horizontally and the center of gravity when it is placed obliquely as the horizontal distance between the geometric center of the groove 111 when it is in the first position and the geometric center when it is in the second position;

[0067] Based on the horizontal distance between the geometric center of the groove 111 when it is in the first position and the geometric center when it is in the second position, determine the second position where the groove 111 is located, so that the center of gravity of the dihedral angle structure 2 and the center of gravity of the carrier 1 are on the same vertical line.

[0068] In the present invention, the two flat plates of the dihedral angle structure 2 are square, the included angle is 90°, and taking a line passing through the right-angle vertex at the bottom of the dihedral angle structure 2 as the axis (this line is parallel to the angle bisector of the dihedral angle), after rotating 45°, the center of gravity of the dihedral angle structure 2 will shift, and the horizontal distance of the center of gravity shift is s.

[0069] In order to make the center of gravity of the dihedral angle structure 2 still on the same vertical line as the center of gravity of the carrier 1 after tilting 45°, it is necessary to design the position of the groove 111 of the carrier 1. The specific design method is as follows: Mark the position of the groove 111 when the dihedral angle structure 2 is placed horizontally and on the same vertical line as the center of gravity of the carrier 1 (the center of gravity of the carrier 1 is located at the geometric center of the carrier 1, and the center of gravity of the dihedral angle structure 2 is located at the midpoint of the connection line of the geometric centers of the two flat plates), and then move the marked position of the groove 111 in the horizontal direction opposite to the tilting direction of the dihedral angle structure 2, and the horizontal moving distance is x2. At this time, open a groove at the new marked position of the groove 111 so that the center of gravity of the combined dihedral angle structure 2 and the carrier 1 is on the same vertical line.

[0070] It should be noted that since the carrier 1 is made of light-density foam, the change in the position of the center of gravity of the support surface 11 being a horizontal plane or an inclined plane is very small, so small that it can be ignored. Of course, the change in the center of gravity caused by opening the groove is also ignored. Therefore, in the present invention, it can be considered that the vertical line where the center of gravity of the carrier 1 is located passes through the geometric center of the cross-section of the carrier 1.

[0071] The calculation formula for the horizontal distance of the center of gravity shift is The formula derivation process is as follows:

[0072] As Figures 3 - 5 shown, when the dihedral angle structure 2 rotates from the horizontal position to the inclined 45° position, the center of gravity of the dihedral angle structure 2 moves from G1 to G2, A1D is the horizontal distance of the center of gravity movement (A1D is s in the above formula), AB and AC are the side lengths of the dihedral angle, ∠B = ∠C = 45°, ∠A = 90°, then

[0073]

[0074] According to the geometric figure, the length of A1O is half of the length of BC, and A1G1 is half of the height of the dihedral angle, that is

[0075]

[0076]

[0077] Since triangle OA2G2 is obtained by rotating triangle OA1G1 by 45°, so

[0078] OG2 = OG1

[0079] A2G2 = A1G1

[0080] OA2 = OA1

[0081] ∠A1OA2 = 45°

[0082] Then

[0083]

[0084]

[0085] In summary, the relationship between the distance of the centroid offset after the dihedral angle is placed obliquely at 45° and the side length of the dihedral angle is:

[0086]

[0087] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A carrier for circular polarization testing of a dihedral angle structure, characterized in that, The carrier (1) is of an integrally formed structure. The carrier (1) has a supporting surface (11), and a fixing portion for supporting the dihedral angle structure (2) is provided on the supporting surface (11). The dihedral angle structure (2) is inclinedly arranged on the supporting surface (11), and the included angle between the dihedral angle structure (2) and the horizontal plane is 45°; The supporting surface (11) is an inclined surface having an included angle with the horizontal plane; The supporting surface (11) is perpendicular to the angular bisecting plane of the dihedral angle structure (2); The fixing portion is a groove (111), and the groove (111) is formed by inward extension of a part of the supporting surface (11); The groove (111) penetrates through the supporting surface (11) and the side surface of the carrier (1), and the two flat plates of the dihedral angle structure (2) extend beyond the side surface; The side surface is a curved surface; The cross-sectional area of the side surface gradually decreases in the direction from bottom to top; The center of gravity of the dihedral angle structure (2) and the center of gravity of the carrier (1) are located on the same vertical line; The two flat plates of the dihedral angle structure (2) are square; The fact that the center of gravity of the dihedral angle structure (2) and the center of gravity of the carrier (1) are located on the same vertical line is determined in the following manner: When the center of gravity of the dihedral angle structure (2) in the horizontal placement and the center of gravity of the carrier (1) are located on the same vertical line, the groove (111) is in the first position; When the center of gravity of the dihedral angle structure (2) in the inclined placement and the center of gravity of the carrier (1) are located on the same vertical line, the groove (111) is in the second position; It is assumed that the geometric center of the groove (111) in the first position and the center of gravity of the carrier (1) are located on the same vertical line, and the geometric center of the groove (111) in the second position and the center of gravity of the carrier (1) are located on the same vertical line; The horizontal distance between the center of gravity of the dihedral angle structure (2) in the horizontal placement and the center of gravity of the dihedral angle structure (2) in the inclined placement is used as the horizontal distance between the geometric center of the groove (111) in the first position and the geometric center of the groove (111) in the second position; Based on the horizontal distance between the geometric center of the groove (111) in the first position and the geometric center of the groove (111) in the second position, the second position where the groove (111) is located is determined so that the center of gravity of the dihedral angle structure (2) and the center of gravity of the carrier (1) are located on the same vertical line.

2. The carrier according to claim 1, wherein, The carrier (1) is made of a wave-transparent foam.

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