High-gain composite reflector antenna and electronic device

Abstract

The invention provides a high-gain composite reflector antenna and an electronic device, and the high-gain composite reflector antenna comprises a feed source which comprises a plurality of radiation units; and the composite reflecting surface is arranged opposite to the feed source, the composite reflecting surface comprises a parabolic reflecting surface and a parabolic cylinder reflecting surface, and the parabolic reflecting surface is connected to one side, facing the feed source, of the parabolic cylinder reflecting surface. According to the high-gain composite reflector antenna and the electronic device provided by the invention, low cost and high gain are realized, the coverage angle range is wide, the product competitiveness can be greatly improved, and the high-gain composite reflector antenna and the electronic device are convenient to install and stable to operate.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a high-gain composite reflector antenna and an electronic device. Background Art

[0002] 5G millimeter waves have high frequencies and short wavelengths, large spatial losses and are easily blocked. The antennas of base stations and terminals need to be designed as high-gain antennas to compensate for spatial losses.

[0003] As we all know, the higher the antenna gain, the narrower the lobe width, that is, the smaller the coverage angle range. Beamforming technology is usually used to expand the coverage angle range. Phased array antennas can solve the above problems at the same time, but the disadvantages are: high cost and high power consumption. Currently, there are many commercial phased array antenna arrays, which are very expensive and consume a lot of power. The size of the whole machine needs to be increased a lot to solve the heat dissipation problem; parabolic antennas are a typical high-gain antenna form, and the antenna gain is very high. The main problem is that the beam is too narrow. The higher the gain, the narrower the beam. The wide beam technologies of parabolic antennas currently include: multi-feed multi-beam parabolic antennas and parabolic cylindrical antennas. Multi-feed multi-beam antennas require multiple feeds, and each feed forms a beam with the reflector. The multi-feed design is complex, the cost is high, and the multi-beam coverage angle range is relatively small. Although the parabolic cylindrical antenna has a wide coverage angle range, its gain is lower than that of parabolic antennas with the same aperture. Summary of the invention

[0004] The purpose of the present application is to provide a high-gain composite reflector antenna and electronic device to at least solve the technical problems in the related art that the phased array antenna has high cost and high power consumption, the parabolic antenna has high gain and narrow beam, and the parabolic antenna has a wide coverage angle range but lower gain than the parabolic antenna of the same caliber.

[0005] According to one embodiment of the present application, a high-gain composite reflector antenna is provided, comprising a feed source, comprising a plurality of radiation units; and a composite reflector, arranged opposite to the feed source, the composite reflector comprising a parabolic reflector and a parabolic cylindrical reflector, the parabolic reflector being connected to the side of the parabolic cylindrical reflector facing the feed source.

[0006] Optionally, the plurality of radiation units are distributed at intervals along a straight line, and the parabolic reflecting surface covers the parabolic reflecting surface along the straight line direction.

[0007] Optionally, the focus of the parabolic reflecting surface, the focus of the parabolic reflecting surface and the phase center of the feed source coincide with each other.

[0008] Optionally, the focal length of the parabolic reflecting surface is F 1 , the focal length of the parabolic reflector is F 2 , F 1 and F 2Meet the following conditions: F 1 >F 2 .

[0009] Optionally, the high-gain composite reflector antenna is a space antenna, and the parabolic reflector and the parabolic reflector reflect the scanning pattern of the feed source into a beam scan in an XOY plane, wherein the XOY plane is a plane formed by an X-axis and a Y-axis that are perpendicular to each other.

[0010] Optionally, the projections of the parabolic reflecting surface and the parabolic reflecting surface in the XOZ plane are respectively the first projection and the second projection, the length of the first projection along the Z axis is D1, and the width along the X axis is W 1 The length of the second projection along the Z axis is D2, the Z axis is perpendicular to the XOY plane, and the width along the X axis is W 2 , wherein the Z axis is perpendicular to the XOY plane, and the XOZ plane is a plane formed by the X axis and the Z axis which are perpendicular to each other; W 1 , W 2 , D 1 and D 2 Meet the following conditions: 1 >W 2 , D 1 =D 2 .

[0011] Optionally, the first projection has a width W along the X axis. 1 The size of is proportional to the coverage of the parabolic reflector and the beam scan of the parabolic reflector in the XOY plane.

[0012] Optionally, the feed source includes a plurality of radiation units spaced apart along the X axis, and the angle θ between the maximum radiation direction of the plurality of radiation units and the Y axis is r =45°.

[0013] Optionally, a metal connector is further included, and the parabolic reflecting surface and the parabolic reflecting surface are connected by the metal connector.

[0014] According to another embodiment of the present application, an electronic device is provided, including a device housing and the high-gain composite reflector antenna as described above, wherein a feed source is disposed in the device housing, and the device housing is connected to the composite reflector.

[0015] Optionally, a structural member is further included, and the device housing is connected to the composite reflective surface through the structural member.

[0016] Optionally, the high-gain composite reflector antenna includes a forward-fed parabola antenna, an offset parabola antenna or a Cassegrain parabola antenna.

[0017] The high-gain composite reflector antenna provided by the embodiment of the present application includes a feed source, including multiple radiation units; and a composite reflector, which is arranged opposite to the feed source, and the composite reflector includes a parabolic reflector and a parabolic cylindrical reflector, and the parabolic reflector is connected to the side of the parabolic cylindrical reflector facing the feed source. This proposal proposes a high-gain composite reflector antenna, which includes a composite reflector, which is composed of two reflective surfaces, a parabolic cylindrical reflector and a parabolic reflector. The beam scanning of the feed source is reflected on the parabolic cylindrical reflector to achieve overall beam scanning, so that the coverage range of the parabolic cylindrical reflector is larger, so that the parabolic reflector can improve the antenna gain in the maximum direction, and does not affect the wide coverage angle range of the parabolic cylindrical reflector.

[0018] The electronic device provided by the present application includes a device housing and a high-gain composite reflector antenna as described above. The feed source is located inside the device housing, and the device housing is connected to the composite reflector to form an integral product. The product can have high gain and a wider coverage angle range while keeping costs under control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, in the drawings, the same parts are marked with the same reference numerals, and the drawings are not drawn according to the actual scale.

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of two reflective surfaces of a high-gain composite reflective surface antenna according to an embodiment of the present application;

[0021] Figure 2 yes Figure 1 The projection diagram of the two reflecting surfaces shown on the YOZ plane;

[0022] Figure 3 yes Figure 1 The projection diagram of the two reflecting surfaces shown on the XOZ plane;

[0023] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the parabolic cylindrical reflecting surface shown;

[0024] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure of the parabolic reflector shown;

[0025] Figure 6 This is a scanning effect diagram of the high-gain compound reflector antenna.

[0026] 1. Parabolic reflecting surface; 2. Parabolic reflecting surface; 3. Feed source; 4. Equipment housing; 5. First projection; 6. Second projection; 7. Metal connector. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of two reflective surfaces of a high-gain composite reflective surface antenna according to an embodiment of the present application.

[0029] like Figure 1 As shown, an embodiment of the present application provides a high-gain composite reflector antenna, comprising a feed source 3, comprising a plurality of radiation units; and a composite reflector, arranged opposite to the feed source 3, the composite reflector comprising a parabolic reflector 2 and a parabolic cylindrical reflector 1, the parabolic reflector 2 being connected to the side of the parabolic cylindrical reflector 1 facing the feed source 3.

[0030] Optionally, the array of feed source 3 can be a linear antenna array or a planar antenna array, the difference lies in the consideration of power, power consumption and cost. Optionally, multiple radiation units are distributed along a straight line, and parabolic cylindrical reflector 1 covers parabolic reflector 2 along the straight line direction.

[0031] For ease of explanation, the embodiment of the present application is described by taking a feed source 3 using a linear antenna array as an example.

[0032] In one embodiment, the high-gain composite reflector antenna is composed of three parts, specifically a parabolic reflector 1, a parabolic reflector 2, and a feed source 3. The feed source 3 uses a phased array millimeter wave antenna module. The feed source 3 is placed in a device housing 4. In one embodiment, the device housing 4 is a customer pre-equipment housing 4 (Customer Premise Equipment, hereinafter referred to as CPE, which is actually a mobile signal access device that receives mobile signals and forwards them as wireless WIFI signals. It is also a device that converts high-speed 5G signals into WiFi signals, and can support a large number of mobile terminals that can access the Internet at the same time). The parabolic reflector 2 is between the parabolic reflector 1 and the feed source 3, and is close to the parabolic reflector 1. The parabolic reflector 2 and the parabolic reflector 1 can be designed into a composite reflector through a structure, and in one embodiment, they are connected by a metal connector 7.

[0033] Furthermore, the parabolic reflective surface 2 and the parabolic cylindrical reflective surface 1 need to have a certain thickness to support the structural strength. The parabolic reflective surface 2 is combined with the parabolic cylindrical reflective surface 1 to form a composite reflective surface through the metal connector 7. The metal connector 7 can be designed according to the structural strength or other requirements.

[0034] It should be noted that the distance between the relative positions of the composite reflective surface and the device housing 4 and the specific fixing method of the two are based on actual conditions and are not limited to the structural design here.

[0035] In addition, this embodiment is also applicable to a forward-feed parabolic antenna, a Cassegrain parabolic antenna or other forms. In this embodiment, the feed source 3 is an offset type.

[0036] The high-gain composite reflector antenna provided by the embodiment of the present application includes a feed source 3, including a plurality of radiation units; and a composite reflector, which is arranged opposite to the feed source 3, and the composite reflector includes a parabolic reflector 2 and a parabolic cylindrical reflector 1, and the parabolic reflector 2 is connected to the side of the parabolic cylindrical reflector 1 facing the feed source 3. This proposal proposes a high-gain composite reflector antenna, which includes a composite reflector, which is composed of two reflectors, a parabolic cylindrical reflector 1 and a parabolic reflector 2, and the overall beam scanning is realized by the reflection of the beam scanning of the feed source 3 on the parabolic cylindrical reflector 1, so that the coverage range of the parabolic cylindrical reflector 1 is larger, so that the parabolic reflector 2 can improve the antenna gain in the maximum direction, and does not affect the parabolic cylindrical reflector 1 to achieve a wider coverage angle range.

[0037] Figure 2 yes Figure 1 The projection diagram of the two reflecting surfaces shown on the YOZ plane.

[0038] like Figure 2As shown, the focus of the parabolic reflector 1, the focus of the parabolic reflector 2 and the phase center of the feed source 3 coincide with each other. In addition, the focal length of the parabolic reflector 1 is F 1 , the focal length of the parabolic reflector 2 is F 2 , F 1 and F 2 Meet the following conditions: F 1 >F 2 .

[0039] Among them, the focus refers to the place where the beam converges into a point after being focused by the reflecting surface, and the phase center refers to the electromagnetic wave radiated by the antenna. After leaving the antenna for a certain distance, its equal phase surface will approximate a sphere, and the center of the sphere is the equivalent phase center of the antenna.

[0040] In one embodiment, the focal lengths of the parabolic reflecting surface 1 and the parabolic reflecting surface 2 are F 1 and F 2 , the focal points of the two reflection surfaces coincide with the phase center of feed source 3. In addition, in order to have a wider coverage angle range, F 1 Should be greater than F 2 , the following takes the operating frequency as 28GHz, F 1 =90mm, F 2 =80mm is used as an example for explanation.

[0041] Furthermore, the vertical distance between the phase center of the feed source 3 and the lower edge of the parabolic reflector 1 along the Z axis is d 1 The vertical distance between the phase center of the feed source 3 and the lower edge of the parabolic reflector 2 along the Z axis is d 2 According to the classical design method of offset parabola antenna, d 1 and d 2 are the distances from the lower edge of parabolic reflector 1 and the lower edge of parabolic reflector 2 to the phase center of feed source 3 in the Z-axis direction, which can be determined according to the actual product design. 1 and d 2 , and d 1 and d 2 The value can be different.

[0042] Please combine Figure 1 and Figure 2 As shown, the high-gain composite reflector antenna is a space antenna, and the space antenna is located in the XOY plane, YOZ plane and XOZ plane divided by the X-axis, Y-axis and Z-axis which are perpendicular to each other; the parabolic reflector 1 and the parabolic reflector 2 reflect the scanning pattern of the feed source 3 as a beam scan in the XOY plane.

[0043] Therefore, the beam scanning range of the feed source 3 is consistent with the antenna scanning range, and the composite reflector can reflect different beams of the feed source 3 to different directions to achieve beam scanning in the XOY plane. If the feed source 3 is a planar array, the final effect of the composite reflector is to achieve XOY beam scanning.

[0044] In one embodiment, the feed source 3 includes a plurality of radiation units spaced apart along the X axis, and the angle θ between the maximum radiation direction of the plurality of radiation units and the Y axis is r =45°.

[0045] The feed source 3 is a millimeter wave phased array antenna module, and the antenna form of the millimeter wave phased array antenna module is an array antenna, which can be distributed along a straight line or in a planar array. Since a millimeter wave phased array antenna module with a smaller number of units is used in the feed source, the cost is greatly reduced compared to a phased array antenna with the same antenna gain. In addition, the antenna of the embodiment of the present application has low cost, good performance, and a wide coverage angle range, which is beneficial to product competitiveness, and is convenient for installation and enhances stability in actual use.

[0046] In another embodiment, the distribution of the millimeter wave phased array antenna modules is spaced apart along a straight line direction, the distribution direction is along the X axis, and the maximum radiation direction forms an angle θ with the Y axis. r , please combine Figure 2 As shown, the angle θ r According to the specific offset height d 1 and d 2 and the lobe width of the feed source 3 in the YOZ plane. In a certain embodiment, θ r is 45°, that is, at θ r The radiation direction when the angle is 45° is the maximum radiation direction. The antenna has directivity and is not uniform in all directions. The maximum radiation direction of the antenna refers to the direction of maximum radiation intensity. The maximum radiation direction of the antenna is affected by the geometric dimensions of the antenna. In the above embodiment, the maximum radiation direction of the antenna is determined by the 3D gain pattern of the antenna after the simulation, that is, the direction of the line connecting the highest value point and the origin, that is, θ r =45° is the direction of maximum radiation.

[0047] Figure 3 yes Figure 1 The projection diagram of the two reflecting surfaces shown on the XOZ plane.

[0048] like Figure 3 As shown, the projections of the parabolic reflecting surface 1 and the parabolic reflecting surface 2 in the XOZ plane are respectively the first projection 5 and the second projection 6, and the length of the first projection 5 along the Z axis is D 1 , the width along the X axis is W 1, the length of the second projection 6 along the Z axis is D 2 , the width along the X axis is W 2 ; W 1 , W 2 , D 1 and D 2 Meet the following conditions: 1 >W 2 , D 1 =D 2 In one embodiment, W 1 =160mm, W 2 =50mm, D 1 =D 2 =200mm.W 1 >W 2 , which can improve antenna gain and widen the coverage angle range, D 1 =D 2 , which facilitates the design of the composite reflective surface and ensures the integrity of the composite reflective surface.

[0049] The projections of the parabolic reflecting surface 1 and the parabolic reflecting surface 2 on the XOZ plane are as follows: Figure 3 As shown, they are the first projection 5 and the second projection 6. The length of the first projection 5 along the Z axis is D 1 , the width along the X axis is W 1 The length of the second projection 6 along the Z axis is D 2 , the width along the X axis is W 2 . D 1 and D 2 The size of D is positively correlated with the overall antenna gain. The larger the size, the stronger the overall antenna gain. 1 and D 2 The sizes of may be equal or unequal. In this embodiment, D 1 and D 2 The size is 200mm.

[0050] In one embodiment, the first projection 5 may be a rectangle or a square, and similarly, the second projection 6 may be a rectangle, a square, an ellipse, a circle or other shapes. In this embodiment, the first projection 5 of the parabolic reflective surface 1 and the second projection 6 of the parabolic reflective surface 2 are both rectangles. And the second projection 6 is located within the first projection 5 to achieve a wider coverage range and meet the requirements of high gain.

[0051] The first projection 5 has a width W along the X axis. 1 The size is proportional to the coverage of the beam scanning of the parabolic cylindrical reflecting surface 1 and the parabolic reflecting surface 2 in the XOY plane.

[0052] It should be noted that the width W of the first projection 5 along the X axis is1 The size is positively correlated with the coverage of the XOY plane, that is, the width W of the first projection 5 along the X axis 1 The larger the size, the larger the XOY plane coverage area. In one embodiment, 1 The size is set to 160mm.

[0053] In addition, the second projection 6 has a width W along the X axis. 2 The size should not be too large. 2 If the size is too large, the first projection 5 will be blocked, thereby affecting the coverage in the XOY plane. 2 The size of W should not be too small, otherwise there will be no effect of improving the gain. 2 The size is set to 50mm.

[0054] Figure 4 yes Figure 1 The three-dimensional structural schematic diagram of the parabolic cylindrical reflecting surface 1 is shown.

[0055] like Figure 4 As shown, the first curve equation of the parabolic reflecting surface 1 in the YOZ plane is:

[0056]

[0057] The Z-axis coordinate range of the first curve in the YOZ plane is [d 1 ,D 1 ], the first curve is translated from the origin to the positive and negative directions of the X-axis by 0.5W respectively 1 , forming a width W along the X axis 1 The parabolic reflecting surface 1.

[0058] Figure 5 yes Figure 1 The three-dimensional structural schematic diagram of the parabolic reflecting surface 2 is shown.

[0059] like Figure 5 As shown, the second curve equation of the parabolic reflector 2 in the YOZ plane is:

[0060]

[0061] The coordinate range of the second curve on the Z axis is [d 2 ,D 2 ], the second curve rotates 360° around the positive direction of the Y axis, and the intersection with the second projection 6 forms the parabolic reflection surface 2.

[0062] In addition, the embodiment of the present application further provides an electronic device, which includes a device housing 4 and the high-gain composite reflector antenna as described above, wherein the feed source 3 is disposed in the device housing 4, and the device housing 4 is connected to the composite reflector. The electronic device may be a 5G millimeter wave device product, and the device product includes a device housing 4 and a feed source 3 therein, and the feed source 3 uses a millimeter wave antenna module with a lower antenna gain.

[0063] In this embodiment, the composite reflective surface and the device housing 4 are fixed by structural parts to form an integral product. The integral product can be fixed by a pole, wall hanging, etc., and transmit and receive strong signals with the base station by rotating the pitch angle and azimuth angle.

[0064] It should be noted that the electronic device provided in this embodiment includes a device housing 4 and the high-gain composite reflector antenna as described above, the feed source 3 is placed in the device housing 4, and the device housing 4 is connected to the composite reflector through the structural member. Since the electronic device includes the above-mentioned high-gain composite reflector antenna, it includes a composite reflector, which is composed of two types of reflectors, one is a parabolic reflector 1, and the other is a parabolic reflector 2. The feed source 3 adopts a phased array antenna module, which can realize the scanning of the feed source 3 directional pattern, and the parabolic reflector 1 reflects the scanning directional pattern of the feed source 3 to form a scanning of the reflection directional pattern. The parabolic reflector 2 is placed between the parabolic reflector 1 and the feed source 3, close to the parabolic reflector 1, and is used to increase the maximum antenna gain. Compared with the simple parabolic reflector 1 antenna, the gain is increased. While achieving low cost / high gain, this embodiment has a wide coverage angle range, which can greatly enhance the competitiveness of the product, and is convenient for installation and stable operation.

[0065] To prepare the electronic device, in one embodiment, the method flow is as follows:

[0066] S1: The antenna form of the feed source 3 should be determined first, specifically: determine the array mode of the feed source 3, that is, choose a linear antenna array or a planar antenna array. The difference lies in the consideration of power, power consumption and cost. Take the linear antenna array along the X-axis direction as an example for explanation;

[0067] S2: Secondly, the form of the composite reflector should be determined, specifically: determine whether it adopts the form of offset, positive feed or Cassegrain, where positive feed means that the feed source 3 is placed at the focus of the composite reflector, offset means that the feed source 3 deviates from the focus of the composite reflector, and Cassegrain means that the two foci of the composite reflector coincide. The coincidence of the focus of the parabolic cylindrical reflector 1, the focus of the parabolic reflector 2 and the phase center of the feed source 3 is used as an example for explanation;

[0068] S3: Determine the size of the parabolic reflector 1 and the parabolic reflector 2, specifically: determine the size of the composite reflector according to the target antenna gain and the radiation pattern of the feed source 3: specifically including d 1 d 2 、F 1 、F 2 , D 1 and D 2 Size, F 1 >F 2 , so as to ensure that the parabolic reflector 1 is between the parabolic reflector 2 and the feed source 3, and determine W according to the simulation results 1 and W 2 Size, W 1 >W 2 , which can improve the antenna gain and widen the coverage angle range. In addition, due to W 1 The size of W is proportional to the coverage of the XOY plane, that is, 1 The larger the size, the larger the XOY plane coverage, W 1 The size should be as large as possible. In one embodiment, W 1 =160mm, and W 2 The size should not be too large, otherwise W 2 Will block W 1 , thus affecting the coverage in the XOY plane, W 2 The size of W should not be too small, otherwise there will be no effect of increasing the gain. 2 =50mm, which can improve the antenna gain and maximize the coverage angle range.

[0069] S4: The parabolic reflecting surface 1 and the parabolic reflecting surface 2 are structurally designed to form a composite reflecting surface, that is, connected by a metal connector 7 .

[0070] S5: The composite reflective surface formed by the parabolic reflective surface 1 and the parabolic reflective surface 2 and the device housing 4 are structurally designed into an easy-to-install product according to the relative position and size requirements.

[0071] Figure 6 This is a scanning effect diagram of the high-gain compound reflector antenna.

[0072] The scanning effect of this embodiment is: Peak Gain = 24.67dBi (Theta / Phi = 90° / 90°), 5dB beam width in XOY plane is 51°, and 5dB beam width in YOZ plane is 4°. For specific antenna gain contour plots (Gain Contour Plot), please refer to Figure 6 shown.

[0073] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-gain composite reflector antenna, characterized in that: include: A feed source, comprising a plurality of radiating units; as well as A composite reflective surface is arranged opposite to the feed source, and the composite reflective surface includes a parabolic reflective surface and a parabolic cylinder reflective surface, and the parabolic reflective surface is connected to a side of the parabolic cylinder reflective surface facing the feed source.

2. The high-gain composite reflector antenna according to claim 1, characterized in that: The plurality of radiation units are distributed at intervals along a straight line, and the parabolic reflecting surface covers the parabolic reflecting surface along the straight line direction.

3. The high-gain composite reflector antenna according to claim 1, characterized in that: The focus of the parabolic reflecting surface, the focus of the parabolic reflecting surface and the phase center of the feed source coincide with each other.

4. The high-gain composite reflector antenna according to claim 2 or 3, characterized in that: The focal length of the parabolic reflecting surface is F1, and the focal length of the parabolic reflecting surface is F2. F1 and F2 satisfy the following condition: F1>F2.

5. The high-gain composite reflector antenna according to claim 1, characterized in that: The parabolic reflecting surface and the parabolic reflecting surface reflect the scanning pattern of the feed source into a beam scan in an XOY plane, wherein the XOY plane is a plane formed by an X-axis and a Y-axis that are perpendicular to each other.

6. The high-gain composite reflector antenna according to claim 5, characterized in that: The projections of the parabolic reflecting surface and the parabolic reflecting surface in the XOZ plane are respectively the first projection and the second projection, the length of the first projection along the Z axis is D1, and the width along the X axis is W1, the length of the second projection along the Z axis is D2, and the width along the X axis is W2, wherein the Z axis is perpendicular to the XOY plane, and the XOZ plane is a plane formed by the mutually perpendicular X axis and Z axis; W1, W2, D1 and D2 satisfy the following conditions: W1>W2, D1=D2.

7. The high-gain composite reflector antenna according to claim 6, characterized in that: The width W1 of the first projection along the X-axis is proportional to the coverage of the parabolic reflecting surface and the beam scanning of the parabolic reflecting surface in the XOY plane.

8. The high-gain composite reflector antenna according to claim 5, characterized in that: The feed source includes a plurality of radiation units spaced apart along the X axis, and the angle θ between the maximum radiation direction of the plurality of radiation units and the Y axis is r =45°.

9. The high-gain composite reflector antenna according to claim 1, characterized in that: It also includes a metal connector, through which the parabolic reflecting surface and the parabolic reflecting surface are connected.

10. An electronic device, characterized in that: It comprises a device housing and the high-gain composite reflector antenna as claimed in any one of claims 1 to 8, wherein the feed source is disposed in the device housing, and the device housing is connected to the composite reflector.

11. The electronic device according to claim 10, characterized in that: It also includes a structural member, and the device housing and the composite reflective surface are connected through the structural member.

12. The electronic device according to claim 10 or 11, characterized in that: The high-gain composite reflector antenna includes a forward-fed parabolic antenna, an offset parabolic antenna or a Cassegrain parabolic antenna.

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