Antenna assembly and detection equipment and nonlinear node detection equipment

Abstract

The present invention discloses an antenna assembly, a detection device and a nonlinear node detection device. The antenna assembly includes an antenna plate, a first reflector and a second reflector. The first reflector is arranged in the back lobe radiation direction of the antenna plate. The second reflector is arranged between the antenna plate and the first reflector, and a gap is formed between the antenna plate and the first reflector respectively. The second reflector also has a first clearance opening that allows at least part of the antenna plate to face at least part of the first reflector. The present application can enhance the reflection of the second-order signal, narrow the main lobe beam of the antenna plate, increase the gain of the second-order signal, and further increase the signal gain as a whole.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of antenna design, and in particular to an antenna component and a detection device and a nonlinear node detection device. Background Art

[0002] Currently, for harmonic detector products (such as nonlinear node detectors), antenna components are usually used to receive the harmonic signals radiated by the target detection object under the action of the fundamental wave. Since the second-order harmonic signal (i.e., the second-order signal) can best represent the signal characteristics of the target detection object, the gain of the second-order frequency point of the antenna component (i.e., the frequency point where the second-order signal is located) is particularly important. However, the gain effect of the existing antenna components for the second-order frequency point is relatively weak, resulting in poor detection accuracy of the detector. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is that the gain of the existing antenna assembly for the second-order frequency point is relatively weak, resulting in poor detection accuracy of the detector.

[0004] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0005] Construct an antenna assembly, comprising:

[0006] Antenna board;

[0007] A first reflector, the first reflector being arranged in a rear lobe radiation direction of the antenna plate; and

[0008] The second reflecting plate is arranged between the antenna plate and the first reflecting plate, and a gap is formed between the second reflecting plate and the antenna plate and the first reflecting plate respectively. The second reflecting plate also has a first clearance opening that allows at least a portion of the antenna plate to face at least a portion of the first reflecting plate.

[0009] In some embodiments, the first relief opening is circumferentially closed or non-closed.

[0010] In some embodiments, the second reflective plate includes at least one first sub-reflective plate, and the at least one first sub-reflective plate defines the first clearance opening.

[0011] In some embodiments, the second reflector includes a first metal layer, a first dielectric layer and a second metal layer, the first metal layer is arranged on the surface of the first dielectric layer facing the antenna plate, and the second metal layer is arranged on the surface of the first dielectric layer facing the first reflector.

[0012] In some embodiments, the antenna board includes a radiating portion, which is opposite to the first clearance opening; the projection of the radiating portion on the plane where the first metal layer is located and the overlapping area of ​​the first metal layer are 0; the projection of the radiating portion on the plane where the second metal layer is located and the overlapping area of ​​the second metal layer are both 0.

[0013] In some embodiments, the antenna assembly further includes a filter plate, which is disposed on a side of the first reflector plate facing away from the second reflector plate, and the filter plate is spaced apart from the first reflector plate.

[0014] In some embodiments, the filter plate includes a third metal layer, a second dielectric layer and a circuit layer, the third metal layer is arranged on the surface of the second dielectric layer facing the first reflective plate, and the circuit layer is arranged on the surface of the second dielectric layer facing away from the first reflective plate.

[0015] In some embodiments, the antenna board includes a feeding point, and the first reflector is provided with a connecting hole corresponding to the feeding point; the filter board is provided with a via hole that penetrates the third metal layer and the second dielectric layer and reaches the circuit layer; the antenna assembly also includes a feeding cable, one end of the feeding cable is connected to the feeding point, and the other end passes through the first clearance port, the connecting hole and the via hole in sequence to be connected to the circuit layer.

[0016] In some embodiments, the feeding cable is insulated from an edge of the connecting hole.

[0017] In some embodiments, the antenna assembly also includes a third reflector, which is disposed between the antenna plate and the second reflector and has a second makeshift opening facing the first makeshift opening, and a size of the second makeshift opening is larger than a size of the first makeshift opening.

[0018] In some embodiments, the axis of the first make way opening coincides with the axis of the second make way opening.

[0019] In some embodiments, a projection of the third reflective plate on the plane where the first reflective plate is located is located within a projection outline of the second reflective plate on the plane where the first reflective plate is located.

[0020] In some embodiments, the second relief opening is circumferentially closed or non-closed.

[0021] In some embodiments, the antenna plate includes a radiating portion, and an overlapping area between a projection of the radiating portion on a plane where the third reflective plate is located and the third reflective plate is zero.

[0022] A detection device is constructed, comprising the antenna assembly described in any one of the above items.

[0023] A nonlinear node detection device is constructed, comprising the antenna assembly described in any one of the above items.

[0024] The implementation of the embodiments of the present invention has at least the following beneficial effects:

[0025] The embodiment of the present application sets a first reflector and a second reflector, wherein the first reflector is set in the radiation direction of the back lobe of the antenna plate, and a first clearance opening is set on the second reflector, so that the antenna assembly constructed by the embodiment of the present application can reflect the back lobe radiation and improve the gain effect of the front lobe radiation of the antenna plate. The antenna assembly constructed by the embodiment of the present application can also reflect the second-order signal, narrow the main lobe beam of the antenna plate, and improve the gain of the second-order signal, thereby further improving the signal gain as a whole, and then improving the detection accuracy of the antenna assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 It is a schematic structural diagram of the antenna assembly in the first embodiment of the present application.

[0028] Figure 2 yes Figure 1 The cross-sectional structure diagram of the antenna assembly is shown.

[0029] Figure 3 yes Figure 1 A schematic structural diagram of the first reflector in the antenna assembly is shown in .

[0030] Figure 4 yes Figure 1 A schematic structural diagram of the second reflector in the antenna assembly is shown.

[0031] Figure 5 yes Figure 1 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency point of 3.6 GHz when the second reflector is not provided and when the second reflector is provided.

[0032] Figure 6 yes Figure 1 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency of 3.8 GHz when the second reflector is not provided and when the second reflector is provided.

[0033] Figure 7 yes Figure 1 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency point of 4.0 GHz when the second reflector is not provided and when the second reflector is provided.

[0034] Figure 8It is a schematic structural diagram of the second reflector in the antenna assembly in the second embodiment of the present application.

[0035] Fig. 9 It is a schematic diagram of the structure of the antenna assembly in the third embodiment of the present application.

[0036] Fig.10 yes Fig. 9 An exploded view of the antenna assembly is shown.

[0037] Fig.11 yes Fig. 9 A top view of the antenna assembly is shown.

[0038] Fig.12 yes Fig. 9 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency of 3.6 GHz when the third reflector is not provided and when the third reflector is provided.

[0039] Fig.13 yes Fig. 9 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency of 3.8 GHz when the third reflector is not provided and when the third reflector is provided.

[0040] Fig.14 yes Fig. 9 The shown graph is a comparison of the gain effects of the antenna assembly at a second-order frequency of 4.0 GHz when the third reflector is not provided and when the third reflector is provided. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the embodiments of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In the following description, specific details such as specific system structures, technologies, etc. are proposed for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from hindering the description of the embodiments of the present application.

[0044] Figure 1 and Figure 2 The antenna assembly in the first embodiment of the present application is shown, including an antenna plate 1, a first reflector 2 and a second reflector 3. The first reflector 2 is arranged in the back lobe radiation direction of the antenna plate 1, and is used to reflect the back lobe radiation of the antenna plate 1. The second reflector 3 is arranged between the antenna plate 1 and the first reflector 2, and is spaced apart from the antenna plate 1 and the first reflector 2 respectively. The second reflector 3 can have a certain reflection effect on the second-order signal of the antenna plate 1, thereby improving the gain of the antenna assembly as a whole for the frequency point where the second-order signal is located.

[0045] Specifically, the second reflector 3 also has a first clearance opening 34 that allows at least part of the antenna plate 1 to face at least part of the first reflector 2. This allows the first reflector 2 to reflect the back lobe radiation of the antenna plate 1 through the first clearance opening 34, and the second reflector 3 can also reflect the second-order signal through the plate-shaped portion forming the first clearance opening 34, thereby improving the gain of the antenna plate 1 at the second-order frequency point.

[0046] It should be understood that the antenna assembly can be applied to nonlinear node detectors to transmit fundamental signals, receive second-order signals, and receive third-order signals. The front lobe radiation direction of the antenna board 1 is opposite to the back lobe radiation direction, so the back lobe radiation after reflection by the first reflector 2 is in the same direction as the front lobe radiation direction of the antenna board 1. That is, the first reflector 2 can superimpose the back lobe radiation of the antenna board 1 with the front lobe radiation to increase the front lobe radiation gain of the antenna board 1. Specifically, Figure 2 Taking the view shown as an example, assuming that the front lobe of the antenna board 1 radiates upward, the rear lobe of the antenna board 1 radiates downward, therefore, the first reflector 2 is located below the antenna board 1 .

[0047] It should be understood that the higher the frequency, the shorter the wavelength. Since the frequency of the second-order signal is higher than that of the first-order signal (the frequency of the first-order signal is the same as the fundamental signal), the propagation distance of the second-order signal is shorter than that of the first-order signal. Since the second reflector 3 is closer to the antenna board 1 than the first reflector 2, the second reflector 3 is more conducive to the reflection of the second-order signal than the first reflector 2, which can improve the gain of the second-order signal. At the same time, the second reflector 3 has a certain constraining effect on the main lobe beam of the antenna board 1, which can narrow the main lobe beam of the antenna board 1, thereby also improving the gain of the second-order signal. Therefore, adding a second reflector 3 can improve the gain of the antenna board 1 at the second-order frequency point, thereby improving the detection accuracy of the antenna assembly.

[0048] Read also Figures 5 to 7 , Figures 5 to 7 The horizontal axis (i.e. "X" in the figure) represents the angle, and the vertical axis (i.e. "Y" in the figure) represents the signal gain. Figure 5 The frequency indicated by the two curves is 3.6GHz. Figure 6 The frequency indicated by the two curves is 3.8 GHz. Figure 7 The frequency indicated by the two curves is 4.0 GHz. Figures 5 to 7 The three frequency points (3.6GHz, 3.8GHz, and 4.0GHz) referred to are the three most important frequencies among the second-order frequency points.

[0049] by Figure 5 Taking the solid line graph of "introducing the second reflector 3" as an example, the vertical coordinate value (i.e., the gain value) corresponding to the angle of 0 is 7.14592db, which means that when the frequency is 3.6GHz, the signal gain of the antenna component after the second reflector 3 is introduced is 7.14592db.

[0050] Figure 6 as well as Figure 7 Similarly, I will not go into details here. Figure 12 to Figure 14 Similarly, I will not go into details in the following text.

[0051] exist Figure 5 In the gain effect comparison diagram shown, when the frequency is 3.6 GHz, the signal gain with the second reflector 3 is 7.14592 db, and the signal gain without the second reflector 3 is 6.60736 db. Figure 6 In the gain effect comparison diagram shown, at a frequency of 3.8 GHz, the signal gain with the second reflector 3 is 7.72749 db, and the signal gain without the second reflector 3 is 7.17191 db. Figure 7 In the gain effect comparison diagram shown, when the frequency is 4.0 GHz, the signal gain with the second reflector 3 is 5.59372 db, and the signal gain without the second reflector 3 is 4.82834 db.

[0052] pass Figures 5 to 7 It can be clearly seen that after the second reflector 3 is added, the signal bandwidths of the three second-order frequency points of 3.6 GHz, 3.8 GHz and 4.0 GHz are narrower than when the second reflector 3 is not provided, and the signal gain is improved.

[0053] It should be understood that the above-mentioned comparison of gain effects under "no second reflector 3 is set" and "second reflector 3 is set" is an effect comparison diagram made using an antenna assembly constructed using a certain same specific embodiment of the present application, and "whether the second reflector 3 is set" is the only variable in the comparison.

[0054] It should be understood that “the first clearance opening 34 that makes at least part of the antenna board 1 face at least part of the first reflector 2”, in other words, due to the provision of the first clearance opening 34, the area on the antenna board 1 that faces the first clearance opening 34 and the area on the first reflector 2 that faces the first clearance opening 34 can face each other. Alternatively, it can also be understood that there is a projection of at least part of the antenna board 1 on the plane where the first reflector 2 is located, which coincides with the projection of the first clearance opening 34 on the plane where the first reflector 2 is located. And / or, “the first clearance opening 34 that makes at least part of the antenna board 1 face at least part of the first reflector 2” can be understood as there is a projection of at least part of the first reflector 2 on the plane where the antenna board 1 is located, which coincides with the projection of the first clearance opening 34 on the plane where the antenna board 1 is located.

[0055] The first embodiment constructed by the present application sets the first reflector 2 and the second reflector 3, so that the antenna assembly constructed by the present embodiment can reflect the back lobe radiation and improve the gain effect of the front lobe radiation of the antenna board 1. The antenna assembly constructed by the present embodiment can also further enhance the reflection of the second-order signal, narrow the main lobe beam of the antenna board 1, and improve the gain of the second-order signal.

[0056] For example Figure 1 and Figure 2 As shown, in one embodiment, the outer contours of the antenna plate 1, the first reflector 2, and the second reflector 3 are all nearly rectangular, and the three are arranged in parallel and spaced apart so that the axes (center normals) of the three coincide with each other. On this basis, at least part of the projection of the antenna plate 1 on the plane where the first reflector 2 is located coincides with the projection of the first clearance opening 34 on the plane where the first reflector 2 is located. At least part of the projection of the first reflector 2 on the plane where the antenna plate 1 is located coincides with the projection of the first clearance opening 34 on the plane where the antenna plate 1 is located.

[0057] In some other optional embodiments, the second reflector 3 may be arranged non-parallel to the antenna plate 1 and the first reflector 2, and the plane where the first reflector 2 and the antenna plate 1 are located may be arranged at a small angle to the plane where the second reflector 3 is located. There may also be a small angle between the first reflector 2 and the plane where the antenna plate 1 is located.

[0058] In some other optional embodiments, when the antenna plate 1, the first reflector plate 2 and the second reflector plate 3 are arranged in parallel and spaced apart, the axes (center normals) of the three may also be arranged in parallel and spaced apart (not overlapping), which is not limited to the embodiments of the present application.

[0059] In some other optional embodiments, at least one of the antenna plate 1, the first reflector 2, and the second reflector 3 may also be provided in other shapes such as circular, polygonal, irregular, etc. The shapes of the antenna plate 1, the first reflector 2, and the second reflector 3 may be the same, or two of them may be the same, or all three may be different.

[0060] In some embodiments, the first escape opening 34 may be closed or open in circumferential direction.

[0061] It should be understood that "closed" means that the second reflector 3 defining the first clearance opening 34 is roughly in the shape of a closed polygonal frame, a circular ring, or an irregular frame. At this time, the first clearance opening 34 is located inside the second reflector 3, that is, the first clearance opening 34 is a through hole formed on the second reflector 3 that is through at both ends in the thickness direction and closed in the circumferential direction. "Non-closed" means that the second reflector 3 defining the first clearance opening 34 is roughly in the shape of a non-closed polygonal frame or an irregular frame. At this time, the first clearance opening 34 is connected to the outside world through the non-closed part of the second reflector 3, and the non-closed part can be a through groove formed on the second reflector 3 that is through at both ends in the thickness direction and partially through (open) in the circumferential direction.

[0062] Specifically, Figure 4As shown, in this embodiment, the outer contour of the second reflector 3 is nearly rectangular, and its inner contour is also nearly rectangular. That is, the first clearance opening 34 is roughly axially closed in a rectangular arrangement, and the second reflector 3 is roughly rectangular frame-shaped.

[0063] Furthermore, in the present embodiment, the center point of the rectangle defined by the inner contour of the second reflector 3 (the rectangle of the first make way opening 34) coincides with the center point of the rectangle defined by the outer contour of the second reflector 3, and the nearly rectangle defined by the inner contour of the second reflector 3 (the nearly rectangle of the first make way opening 34) and the nearly rectangle defined by the outer contour of the second reflector 3 are similar shapes.

[0064] In some other optional embodiments, the rectangular center point of the first clearance opening 34 and the rectangular center point of the second reflector 3 may not overlap. The first clearance opening 34 may also be in other shapes such as a circle, a polygon, an irregular shape, etc. The first clearance opening 34 (the inner contour of the second reflector 3) may also be set to a different shape from the outer contour of the second reflector 3. When the first clearance opening 34 (the inner contour of the second reflector 3) and the outer contour of the second reflector 3 are set to the same shape, the two may also be set to be dissimilar.

[0065] In some embodiments, the antenna board 1 includes an antenna layer 11, on which an antenna (such as a double helix antenna, etc.) is disposed, which can simultaneously support the transmission and reception of electromagnetic wave signals, and convert the relevant signals into electrical signals for output after receiving them.

[0066] Specifically, Figure 1 As shown, the antenna layer 11 includes a radiating portion 111 that generates electromagnetic wave radiation. The radiating portion 111 is opposite to the first clearance opening 34, and the projection area on the second reflector 3 is 0. In this way, the radiating portion 111 and the first reflector 2 are not blocked by the second reflector 3, so it is equivalent to that the radiating portion 111 and the first reflector 2 are directly facing each other, so that more signals (such as fundamental wave signals and first-order signals) generated or received by the radiating portion 111 can reach the first reflector 2, so as to ensure the reflection effect of the first reflector 2 on the back lobe radiation of the antenna plate 1.

[0067] It should be understood that “the projection area of ​​the radiating portion 111 on the second reflector 3 is 0”, in this embodiment, for example, means that the projection of the radiating portion 111 on the plane where the second reflector 3 is located and the overlapping area of ​​the second reflector 3 are 0. That is, the projection of the radiating portion 111 on the plane where the second reflector 3 is located is located within the first clearance opening 34. For example: the area of ​​the radiating portion 111 is less than or equal to the first clearance opening 34, and the radiating portion 111 is directly opposite to the first clearance opening 34. In addition, since the back lobe radiation of the antenna board 1 is diffuse, even if the projection area of ​​the radiating portion 111 on the second reflector 3 is 0, the back lobe radiation of the antenna board 1 (such as the second-order signal) can reach the second reflector 3 and be reflected by the second reflector 3. That is, even if the projection area of ​​the radiating portion 111 on the second reflector 3 is 0, the second reflector 3 can also achieve the effect of back lobe reflection of the second-order signal of the antenna board 1, so as to achieve the effect of improving the gain of the second-order signal.

[0068] Specifically, see Figure 2 In this embodiment, the projection of the antenna plate 1 on the second reflector 3 is within the first clearance opening 34 , and the antenna plate 1 is coaxially arranged with the inner contour (first clearance opening 34 ) of the second reflector 3 .

[0069] Continue reading Figure 2 ,exist Figure 2 In the angle shown, the axis L is the common axis (center normal) of the antenna plate 1, the first reflector 2, and the second reflector 3. The cross-sectional length dimension of the antenna plate 1 (width of the antenna plate 1 / length of a certain side) is marked as C in the figure, the cross-sectional length dimension of the inner contour of the second reflector 3 (width of the first clearance opening 34 / length of a certain side) is marked as A in the figure, the cross-sectional length dimension of the outer contour of the second reflector 3 (width of the second reflector 3 / length of a certain side) is marked as D in the figure, and the cross-sectional length dimension of the first reflector 2 (width of the first reflector 2 / length of a certain side) is marked as E in the figure. Among them, E is greater than D, greater than A, and greater than C.

[0070] In some other optional embodiments, the projection of the antenna plate 1 on the plane where the second reflector 3 is located can also make its outer contour coincide with the inner contour of the second reflector 3. It should be understood that the positional relationship between the antenna plate 1 and the second reflector 3 can be flexibly set, and it is only necessary to ensure that the projection area of ​​the radiation portion 111 on the antenna plate 1 on the second reflector 3 is 0.

[0071] In some embodiments, Figure 2As shown, the second reflector 3 includes a first metal layer 31, a first dielectric layer 32 and a second metal layer 33. The first metal layer 31 is arranged on the surface of the first dielectric layer 32 facing the antenna plate 1, and the second metal layer 33 is arranged on the surface of the first dielectric layer 32 facing the first reflector 2. The first metal layer 31 and the second metal layer 33 are both used to reflect signals. The first dielectric layer 32 is used to carry the first metal layer 31 and the second metal layer 33.

[0072] It should be understood that since the components used to reflect signals are mainly the first metal layer 31 and the second metal layer 33, in some embodiments, "the projection area of ​​the radiation portion 111 on the second reflection plate 3 is 0" may also mean that the projection area of ​​the radiation portion 111 on the first metal layer 31 and the second metal layer 33 is 0.

[0073] That is, in some embodiments, when the inner / outer contours of the first metal layer 31, the second metal layer 33, and the first dielectric layer 32 are inconsistent, the size of the projection area of ​​the radiation portion 111 on the second reflective plate 3 is based on the size of the projection areas of the radiation portion 111 on the first metal layer 31 and the second metal layer 33, that is, at this time, the projection areas of the radiation portion 111 on the first metal layer 31 and the second metal layer 33 are respectively 0.

[0074] That is, the overlapping area between the projection of the radiation portion 111 on the plane where the first metal layer 31 is located and the first metal layer 31 is zero, and the overlapping area between the projection of the radiation portion 111 on the plane where the second metal layer 33 is located and the second metal layer 33 is zero.

[0075] Taking the case where the inner contour circumference of the first dielectric layer 32 is smaller than the inner contour circumference of the first metal layer 31 and the inner contour circumference of the second metal layer 33, so that part of the inner circumference of the first dielectric layer 32 is not covered by the first metal layer 31 and the second metal layer 32 as an example, in this embodiment, the projection of the radiation portion 111 on the second reflector 3 can be partially located outside the first clearance opening 34 (that is, part of the projection is located on the first dielectric layer 32). At this time, it is only necessary to ensure that the projection of the radiation portion 1111 as a whole on the second reflector 3 is within the inner contours of the first metal layer 31 and the second metal layer 33.

[0076] For example Figure 1 , Figure 2As shown, in some embodiments, the antenna assembly also includes a filter plate 4, which is arranged on the side of the first reflector 2 facing away from the second reflector 3, and is spaced apart from the first reflector 2. It is electrically connected to the antenna plate 1, and is used to receive the electrical signal output by the antenna plate 1, and output the electrical signal after filtering to improve the purity of the electrical signal, and transmit the filtered electrical signal to the radio frequency board and the baseband board (not shown in the figure) to improve the detection effect. The antenna plate 1 realizes the detection function by converting the relevant electromagnetic wave signal into an electrical signal, and then outputs it to the filter plate 4, the radio frequency board and the baseband board in sequence. Alternatively, the filter plate 4 is also used to transmit the radio frequency signal from the radio frequency board to the antenna plate 1, so that the antenna plate 1 can transmit the fundamental wave signal.

[0077] It should be understood that in order to improve the detection effect, it is necessary to ensure that the filter board 4, the radio frequency board and the baseband board are not interfered with. By arranging the first reflector 2 between the antenna board 1 and the filter board 4, by reflecting the back lobe radiation, not only the front lobe radiation gain of the antenna board 1 can be improved, but also the interference of the back lobe radiation of the antenna board 1 on the filter board 4, the radio frequency board and the baseband board can be reduced at the same time to ensure the detection effect.

[0078] In this embodiment, the outer contour of the filter plate 4 is, for example, roughly rectangular, and is arranged parallel to and spaced from the first reflector 2 , and can be arranged to coincide with the axis (center normal) of the antenna plate 1 , the first reflector 2 , and the second reflector 3 .

[0079] Further, see Figure 2 In this embodiment, the outer contour of the first reflection plate 2 is smaller than the outer contour of the filter plate 4 .

[0080] In some other optional embodiments, the outer contour of the first reflector 2 may be smaller than or equal to the outer contour of the second reflector 3, and the size of the outer contour is ensured to be larger than the inner contour of the second reflector 3. The outer contour of the filter plate 4 may also be smaller than or equal to the outer contour of the first reflector 2.

[0081] In some embodiments, Figure 2 As shown, the filter board 4 includes a third metal layer 41, a second dielectric layer 42 and a circuit layer 43. Among them, the third metal layer 41 is arranged on the surface of the second dielectric layer 42 facing the first reflector 2, which can reflect the back lobe radiation of the antenna board 1, and then play the role of another reflector, which is conducive to further improving the front lobe radiation gain of the antenna board 1, and further reducing the interference of the back lobe radiation on the filter board 4 (mainly the circuit layer 43). The circuit layer 43 is arranged on the surface of the second dielectric layer 42 facing away from the first reflector 2. The second dielectric layer 42 is used to carry the third metal layer 41 and the circuit layer 43.

[0082] In some embodiments, the antenna board 1 further includes a third dielectric layer 12, which is disposed on the surface of the antenna layer 11 facing the filter board 4 and is used to carry the antenna layer 11. In this positional relationship, the direction of the antenna layer 11 (the direction away from the third dielectric layer 12) is the front lobe radiation direction of the antenna board 1.

[0083] For example Figure 1 and Figure 3 As shown, specifically, the antenna layer 11 of the antenna board 1 also includes a feeding point 112, a connection hole 24 is provided at a position of the first reflector 2 corresponding to the feeding point 112, and a via 44 (connected to the filter board 4) is formed on the filter board 4. Fig.10 The via hole 44 penetrates the third metal layer 41 and the second dielectric layer 42 to reach the circuit layer 43.

[0084] Read also Figure 2 The antenna assembly also includes a feed cable 5, one end of which is connected to the feed point 112, and the other end of which passes through the first opening 34, the connection hole 24 and the via 44 in sequence and is connected to the circuit layer 43. That is, the antenna board 1 and the filter board 4 are electrically connected through the feed cable 5.

[0085] It should be understood that the feeding point 112 is located at the end of the radiating portion 111 , and the radiating portion 111 and the feeding point 112 together constitute the antenna of the antenna layer 11 .

[0086] In this embodiment, the antenna may be a double helix antenna, and the number of feeding points 112 is two, which are arranged adjacent to each other and are approximately located at the midpoint of the antenna board 1. Correspondingly, the number of feeding cables 5 is also two, which are connected to the two feeding points 112 respectively.

[0087] For example Figure 1 and Figure 3 As shown, since the two feeding points 112 are arranged adjacent to each other, the number of the connecting hole 24 is one, and its size is larger than the sum of the cross-sectional sizes of the two feeding cables 5, and the two feeding cables 5 are penetrated at the same time. The connecting hole 24 is located at the midpoint of the first reflector 2 in this embodiment. Fig.10 As shown, there are two via holes 44 , which are respectively arranged corresponding to the two feeding cables 5 , and the two are approximately located at the midpoint of the filter board 4 .

[0088] In some other optional embodiments, the number of the feed point 112 can be changed to one or more according to the change of the antenna. The number of feed cables 5 is adjusted accordingly. The setting position of the feed point 112 on the antenna board 1 can also be at other positions other than the midpoint. The number of the connection holes 24 can also correspond to the number of the feed cables 5. The number of vias 44 can also be set to one to ensure that the feed cable 5 can pass through. The setting position of the connection hole 24 and / or the via 44 can also be at other positions other than the midpoint.

[0089] In some embodiments, the feeding cable 5 is insulated from the edge of the connecting hole 24 .

[0090] Specifically, it can be achieved by coating an insulating layer on the side wall around the connection hole 24, or by providing an insulating film on the feeder cable 5, or by spacing the feeder cable 5 from the connection hole 24, etc. No specific limitation is made here.

[0091] For example Figure 2 As shown, in some embodiments, the first reflector 2 includes a fourth metal layer 21, a fourth dielectric layer 22, and a fifth metal layer 23, wherein the fourth metal layer 21 is disposed on the surface of the fourth dielectric layer 22 facing the second reflector 3, and the fifth metal layer 23 is disposed on the surface of the fourth dielectric layer 22 facing the filter plate 4. The fourth metal layer 21 and the fifth metal layer 23 are both used for reflecting signals. The fourth dielectric layer 22 is used for carrying the fourth metal layer 21 and the fifth metal layer 23.

[0092] Among them, at least one of the first metal layer 31, the second metal layer 33, the third metal layer 41, the fourth metal layer 21, and the fifth metal layer 23 may be a copper foil layer. At least one of the first dielectric layer 32, the second dielectric layer 42, the third dielectric layer 12, and the fourth dielectric layer 22 may be an insulating substrate of a commonly used printed circuit board (PCB).

[0093] It should be understood that the antenna plate 1 and the second reflector plate 3 are respectively arranged on one side of the first reflector plate 2 through connectors such as bolts of different sizes and RF connectors, thereby achieving positioning relative to the first reflector plate 2 so that the three are parallel to each other and spaced apart.

[0094] The first reflector 2 and the filter plate 4 are positioned by a plurality of sheet-shaped, block-shaped, or columnar connectors so that the two are parallel to each other and spaced apart. When the embodiment of the application is applied to a detector, the housing of the detector can also be used to position and fix the antenna assembly of the application, which is not limited in the embodiment.

[0095] Figure 8The antenna assembly in the second embodiment of the present application is shown, and the differences between the antenna assembly in the second embodiment and the antenna assembly in the first embodiment include at least the following contents, and the remaining features can adopt the solution of the first embodiment.

[0096] The second reflector 3 includes at least one first sub-reflector 301 . All the first sub-reflectors 301 define a first clearance opening 34 .

[0097] Specifically, in this embodiment, there are four first sub-reflectors 301, and each first sub-reflector 301 is arranged in a substantially longitudinal rectangular shape. The long axes of any two adjacent first sub-reflectors 301 are perpendicular to each other, and the four first sub-reflectors 301 are adjacent end to end, so that the second reflector 3 is arranged in a substantially rectangular shape as a whole. However, the four first sub-reflectors 301 are not arranged end to end in sequence, and the adjacent ends of two adjacent first sub-reflectors 301 are arranged at intervals, so that the non-enclosed first clearance openings 34 defined by the four first sub-reflectors 301 have four positions in the circumferential direction that are connected to the outside.

[0098] In some other optional embodiments, the number of the first sub-reflector 301 can be one, which is arranged in a longitudinal irregular plate shape, and the two ends of the longitudinal first sub-reflector 301 are adjacent but not connected, so that the first sub-reflector 301 can define a first yield opening 34 with one side open in the circumferential direction.

[0099] In some other optional embodiments, the number of the first sub-reflectors 301 may also be two, three, five or other plurality. When the number of the first sub-reflectors 301 is multiple, each first sub-reflector 301 may be provided separately and not connected to other first sub-reflectors 301. Some of the first sub-reflectors 301 may also be connected end to end and adjacent to the other first sub-reflectors 301 end to end but provided at intervals.

[0100] Figures 9 to 11 The antenna assembly in the third embodiment of the present application is shown, and the differences between the antenna assembly in the third embodiment and the antenna assembly in the first embodiment include at least the following contents, and the remaining features can adopt the solution of the first embodiment.

[0101] In this embodiment, the antenna assembly further includes a third reflector 6, which is disposed between the antenna plate 1 and the second reflector 3 and has a second clearance opening 61 facing the first clearance opening 34. The size of the second clearance opening 61 is larger than the size of the first clearance opening 34. This further improves the overall reflection effect of the antenna assembly on the back lobe radiation of the antenna plate 1 and the gain of the antenna plate 1 at the second-order frequency point.

[0102] It should be understood that the size of the clearance opening is, for example, the area of ​​the clearance opening. The larger the size of the clearance opening, the narrower the main lobe beam of the antenna board 1, and the higher the gain of the antenna board 1. Therefore, compared with the first embodiment, the antenna assembly of this embodiment can further constrain the main lobe beam of the antenna board 1 by further providing a third reflector 6, and providing a second clearance opening 61 on the third reflector 6 that is larger than the first clearance opening 34, so as to further improve the gain of the antenna board 1 at the second-order frequency point.

[0103] Read also Figure 12 to Figure 14 , Figure 12 to Figure 14 The horizontal axis (i.e. "X" in the figure) represents the angle, and the vertical axis (i.e. "Y" in the figure) represents the signal gain. Fig.12 The frequency indicated by the curve shown in is 3.6 GHz. Fig.13 The frequency indicated by the curve shown in is 3.8 GHz. Fig.14 The frequency indicated by the curve shown in FIG. 4 is 4.0 GHz.

[0104] exist Fig.12 In the gain effect comparison diagram shown, at a frequency of 3.6 GHz, the signal gain with the third reflector 6 is 7.63505 db, and the signal gain without the third reflector 6 (i.e., only the first reflector 2 and the second reflector 3 are provided, and the same applies to the following content) is 7.09751 db. Fig.13 In the gain effect comparison diagram shown, when the frequency is 3.8 GHz, the signal gain with the third reflector 6 is 8.08921 db, and the signal gain without the third reflector 6 is 7.72749 db. Fig.14 In the gain effect comparison diagram shown, when the frequency is 4.0 GHz, the signal gain with the third reflector 6 is 6.07614 db, and the signal gain without the third reflector 6 is 5.59372 db.

[0105] pass Figure 12 to Figure 14 It can be clearly seen that after the third reflector 6 is added, the signal bandwidths at the three second-order frequency points of 3.6 GHz, 3.8 GHz and 4.0 GHz are narrower than when the second reflector 3 is not provided, and the signal gain is improved.

[0106] It should be understood that the above-mentioned comparison of gain effects under "not setting the third reflector 6" and "setting the third reflector 6" is an effect comparison chart made using an antenna assembly constructed using a certain same specific embodiment of the present application, and "whether the third reflector 6 is set" is the only variable in the comparison.

[0107] It should be understood that “the second clearance opening 61 facing the first clearance opening 34” refers to the setting position of the third reflector 6 so that the second clearance opening 61 is directly opposite to the first clearance opening 34. In other words, the projection of the first clearance opening 34 on the plane where the antenna board 1 is located is within the projection of the second clearance opening 61 on the plane where the antenna board 1 is located, and the projection of the first clearance opening 34 on the plane where the first reflector 2 is located is within the projection of the second clearance opening 61 on the plane where the first reflector 2 is located.

[0108] Specifically, the third reflector 6 is arranged parallel to and spaced from the antenna plate 1 and the second reflector 3 so that the axes (center normals) of the three coincide with each other. The outer contour thereof is roughly rectangular.

[0109] In some other optional embodiments, the outer contour of the third reflector 6 may also be arranged in other shapes such as circular, polygonal, irregular, etc. The third reflector 6 may also be arranged non-parallel to the antenna plate 1 and the first reflector 2. When the three are arranged in parallel and spaced apart, at least one axis (center normal) of the three may be arranged in parallel and spaced apart (non-coincidence) with the other axes (center normals).

[0110] In some embodiments, the circumference of the second clearance opening 61 may also be closed or non-closed.

[0111] It should be understood that "closed" means that the third reflector 6 defining the second clearance opening 61 is roughly in the shape of a closed polygonal frame, a circular ring, or an irregular frame. At this time, the second clearance opening 61 is located in the third reflector 6, that is, it is a through hole formed by the third reflector 6 that is through at both ends in the thickness direction and closed in the circumferential direction. "Non-closed" means that the third reflector 6 defining the second clearance opening 61 is roughly in the shape of a non-closed polygonal frame or an irregular frame. At this time, the second clearance opening 61 is connected to the outside world through the non-closed part of the third reflector 6, that is, it is a through groove formed by the third reflector 6 that is through at both ends in the thickness direction and partially through (open) in the circumferential direction.

[0112] Specifically, Figures 9 to 11 As shown, in this embodiment, the outer contour of the third reflector 6 is nearly rectangular, and the inner contour is also nearly rectangular. That is, the second clearance opening 61 is roughly axially closed in a rectangular arrangement, and the third reflector 6 is roughly in a rectangular frame shape.

[0113] Furthermore, the rectangular center point of the second clearance opening 61 coincides with the rectangular center point of the third reflector 6, and the near rectangle defined by the inner contour of the third reflector 6 (the near rectangle of the second clearance opening 61) and the near rectangle defined by the outer contour of the third reflector 6 are similar shapes.

[0114] At the same time, if Fig.10As shown, in this embodiment, the axis (center normal) of the first clearance opening 34 coincides with the axis (center normal) of the second clearance opening 61. This makes the constraint boundary from the first reflector 2 to the third reflector 6 roughly step-shaped to ensure uniformity of signal reflection in all directions.

[0115] That is, in Fig.11 In the top view shown, the rectangular center point of the first clearance opening 34 coincides with the rectangular center point of the second clearance opening 61. At this time, the width of the first clearance opening 34 is A1 in the figure, and the width of the second clearance opening 61 is B1 in the figure, and B1 is greater than A1.

[0116] Further, see Fig.11 In this embodiment, the outer contour size of the second reflector 3 is the same as the outer contour size of the third reflector 6, both of which are Fig.11 Since the second clearance opening 61 is larger than the first clearance opening 34, the inner contour dimension of the third reflector 6 is larger than the outer contour dimension of the second reflector 3. That is, the frame width of the third reflector 6 is smaller than the frame width of the second reflector 3. At this time, the projection of the third reflector 6 on the plane where the first reflector 2 is located is located within the projection contour of the second reflector 3 on the plane where the first reflector 2 is located.

[0117] In some other optional embodiments, the inner contour (second clearance opening 61) of the third reflector 6 can be set in other shapes such as circular, polygonal, irregular, etc. The outer contour and the inner contour of the third reflector 6 can be different in shape. The shapes of the two can also be set to be dissimilar. When the outer contour and the inner contour have the same shape, the center points of the two can also be set to be different.

[0118] In some other optional embodiments, the shapes of the first clearance opening 34 and the second clearance opening 61 can be set differently. The axes (center normals) of the two can also be set in parallel, spaced apart, or non-parallel.

[0119] In some embodiments, the third reflector 6 defining the second clearance opening 61 may be composed of at least one second sub-reflector (not shown in the figure). When the circumference of the second clearance opening 61 is not closed, the third reflector 6 may be composed of a second sub-reflector that is not connected end to end, or may be composed of a plurality of second sub-reflectors that are adjacent end to end but spaced apart. Or, when the circumference of the second clearance opening 61 is not closed, the third reflector 6 may be composed of at least a portion of second sub-reflectors that are connected end to end, and the remaining portion of second sub-reflectors that are adjacent end to end but spaced apart. Its setting is similar to the second reflector in the first embodiment and the second embodiment, and will not be repeated here.

[0120] In some embodiments, the projection area of ​​the radiation portion 111 on the third reflection plate 6 is 0.

[0121] It should be understood that "the projection area of ​​the radiation portion 111 on the third reflector 6 is 0", in this embodiment, means that the overlapping area of ​​the projection of the radiation portion 111 on the plane where the third reflector 6 is located and the third reflector 6 is 0. That is, the projection of the radiation portion 111 on the plane where the first reflector 2 is located is located within the projection range of the second clearance opening 61 on the plane where the first reflector 2 is located. Fig.11 , the width of the antenna plate 1 is C1 in the figure. In this embodiment, C1 is smaller than A1. Since A1 is smaller than B1, C1 is smaller than B1, and the antenna plate 1, the third reflector 6 and the second reflector 3 are coaxially arranged (center normal), so the projection of the antenna plate 1 on the plane where the third reflector 6 is located is within the second clearance opening 61.

[0122] It should be understood that the positional relationship between the antenna plate 1 and the third reflector 6 can be flexibly set, and it is only necessary to ensure that the projection area of ​​the radiation portion 111 on the antenna plate 1 on the third reflector 6 is zero.

[0123] Furthermore, the third reflector 6 includes a sixth metal layer, a fifth dielectric layer and a seventh metal layer (not shown in the figure). The sixth metal layer is arranged on the surface of the fifth dielectric layer facing the antenna plate 1, and the seventh metal layer is arranged on the surface of the fifth dielectric layer facing the second reflector 3. The sixth metal layer and the seventh metal layer are both used to reflect signals. The fifth dielectric layer is used to carry the sixth metal layer and the seventh metal layer.

[0124] The sixth metal layer and the seventh metal layer may be copper foil layers. The fifth dielectric layer may be an insulating substrate of a common printed circuit board (PCB).

[0125] In some embodiments, “the projection area of ​​the radiation portion 111 on the third reflector 6 is 0” may also mean that the projection area of ​​the radiation portion 111 on the sixth metal layer and the seventh metal layer is 0.

[0126] That is, the overlapping area between the projection of the radiation portion 111 on the plane where the sixth metal layer is located and the sixth metal layer is 0. The overlapping area between the projection of the radiation portion 111 on the plane where the seventh metal layer is located and the seventh metal layer is 0.

[0127] In some embodiments, the projection of the radiation portion 111 on the third reflective plate 6 may not be 0. When the size of the fifth dielectric layer is different from that of the sixth metal layer and the seventh metal layer, the projection of the radiation portion 111 on the fifth dielectric layer may not be 0. At this time, it is only necessary to ensure that its projection area on the sixth metal layer and the seventh metal layer is 0.

[0128] The embodiment of the present application also constructs a detection device, including the antenna assembly in any one of the above embodiments.

[0129] The embodiment of the present application also constructs a nonlinear node detection device, including the antenna assembly in any one of the above embodiments.

[0130] It is understandable that the above embodiments only express some implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the embodiments of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the embodiments of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope of the claims of the present invention.

Claims

1. An antenna assembly, characterized in that: include: An antenna board (1), the antenna board (1) comprising an antenna layer (11) for transmitting and receiving electromagnetic wave signals; A first reflector (2), the first reflector (2) being arranged in the rear lobe radiation direction of the antenna plate (1); as well as A second reflector (3), the second reflector (3) being arranged between the antenna plate (1) and the first reflector (2), and forming a gap between the second reflector (3) and the antenna plate (1) and the first reflector (2), respectively; the second reflector (3) further comprising a first clearance opening (34) for allowing at least a portion of the antenna plate (1) to face at least a portion of the first reflector (2).

2. The antenna assembly according to claim 1, characterized in that: The first clearance opening (34) is circumferentially closed or non-closed.

3. The antenna assembly according to claim 2, characterized in that: The second reflective plate (3) comprises at least one first sub-reflective plate (301), and the at least one first sub-reflective plate (301) defines and forms the first clearance opening (34).

4. The antenna assembly according to claim 1, characterized in that: The second reflector (3) comprises a first metal layer (31), a first dielectric layer (32) and a second metal layer (33); the first metal layer (31) is arranged on a surface of the first dielectric layer (32) facing the antenna plate (1); and the second metal layer (33) is arranged on a surface of the first dielectric layer (32) facing the first reflector (2).

5. The antenna assembly according to claim 4, characterized in that: The antenna plate (1) comprises a radiating portion (111), the radiating portion (111) being opposite to the first clearance opening (34); the projection of the radiating portion (111) on the plane where the first metal layer (31) is located and the overlapping area of ​​the first metal layer (31) are 0; the projection of the radiating portion (111) on the plane where the second metal layer (33) is located and the overlapping area of ​​the second metal layer (33) are both 0.

6. The antenna assembly according to claim 1, characterized in that: The antenna assembly further comprises a filter plate (4), wherein the filter plate (4) is arranged on a side of the first reflector (2) facing away from the second reflector (3), and the filter plate (4) is spaced apart from the first reflector (2).

7. The antenna assembly according to claim 6, characterized in that: The filter plate (4) comprises a third metal layer (41), a second dielectric layer (42) and a circuit layer (43); the third metal layer (41) is arranged on a surface of the second dielectric layer (42) facing the first reflector (2); and the circuit layer (43) is arranged on a surface of the second dielectric layer (42) facing away from the first reflector (2).

8. The antenna assembly according to claim 7, characterized in that: The antenna board (1) comprises a feeding point (112), and the first reflector (2) is provided with a connection hole (24) corresponding to the feeding point (112); the filter board (4) is provided with a via hole (44) penetrating the third metal layer (41) and the second dielectric layer (42) and reaching the circuit layer (43); the antenna assembly also comprises a feeding cable (5), one end of the feeding cable (5) is connected to the feeding point (112), and the other end passes through the first clearance opening (34), the connection hole (24), and the via hole (44) in sequence to be connected to the circuit layer (43).

9. The antenna assembly according to claim 8, characterized in that: The feeder cable (5) is insulated from the edge of the connection hole (24).

10. The antenna assembly according to any one of claims 1 to 9, characterized in that: The antenna assembly further comprises a third reflector plate (6), the third reflector plate (6) being arranged between the antenna plate (1) and the second reflector plate (3), and having a second clearance opening (61) facing the first clearance opening (34), and the size of the second clearance opening (61) being larger than the size of the first clearance opening (34).

11. The antenna assembly according to claim 10, characterized in that: The axis of the first clearance opening (34) coincides with the axis of the second clearance opening (61).

12. The antenna assembly according to claim 10, characterized in that: The projection of the third reflector (6) on the plane where the first reflector (2) is located is located within the projection outline of the second reflector (3) on the plane where the first reflector (2) is located.

13. The antenna assembly according to claim 10, characterized in that: The second clearance opening (61) is arranged to be closed or non-closed in the circumferential direction.

14. The antenna assembly according to claim 10, characterized in that: The antenna plate (1) comprises a radiating portion (111), and an overlapping area between a projection of the radiating portion (111) on a plane where the third reflector (6) is located and the third reflector (6) is 0.

15. A detection device, characterized in that: The antenna assembly comprises any one of claims 1 to 14.

16. A nonlinear node detection device, characterized in that: The antenna assembly comprises any one of claims 1 to 14.

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