A reflector antenna for Q / V band

Abstract

This invention discloses a reflector antenna for the Q / V band. A main reflector is concentrically attached to the inner side of a support assembly. A sub-reflector assembly is mounted on the main reflector via a support rod, the lower end of which passes through the main reflector and is fixedly connected to the support assembly. A through-hole is provided at the top of the main reflector, and a feed assembly passes through the through-hole. The feed assembly, sub-reflector, and main reflector are coaxially arranged. The support assembly, support rod, sub-reflector assembly, and feed assembly are all chamfered. The feed assembly of this invention is simple, easy to process and manufacture, reducing the manufacturing and installation cost of the reflector antenna, eliminating the need for additional expensive materials to process the feed assembly. It effectively broadens the bandwidth of the reflector antenna, achieving higher port isolation and cross-polarization isolation, enabling multiplexing in satellite communication systems, and improving the overall performance of the reflector antenna of this invention.

Description

Technical Field

[0001] This utility model relates to the field of satellite communication technology, specifically to a reflector antenna applied to the Q / V band. Background Technology

[0002] Reflector antennas, with their high gain, high directivity, and mature manufacturing processes, play an irreplaceable role in key fields such as satellite communication, high-speed point-to-point transmission, radar systems, and deep space exploration. Their core principle is to use a precisely designed transmitting surface to convert the electromagnetic waves radiated from the feed source for directional radiation, or to focus the incident wave onto the feed source for efficient reception.

[0003] To meet the explosive growth in broadband demand, communication systems are rapidly migrating to higher frequency bands. The Q / V band, with its extremely wide available spectrum resources, has become a key carrier for achieving Tbps-level communication capacity. However, deploying high-performance reflector antennas in this band faces a series of significantly intensified technical challenges.

[0004] With the rapid development of modern wireless communication, radar detection, and space technology, increasingly stringent and diverse requirements have been placed on the performance of reflector antennas, mainly reflected in the following aspects: (1) Wideband / multi-band operating requirements; (2) Low sidelobe and high cross-polarization discrimination rate; (3) Compact structure and lightweight; However, traditional parabolic antennas have limited scanning capabilities, their off-axis performance deteriorates sharply in the Q / V bands, and it is difficult to optimize efficiency, beamwidth, and sidelobes over a wide bandwidth. Array-fed reflectors / composite reflectors, on the other hand, face serious challenges in engineering due to their high system complexity, weight, and cost, as well as the huge losses in the power-depleted network in the Q / V bands. Utility Model Content

[0005] The purpose of this invention is to provide a reflector antenna for the Q / V band, effectively solving the technical problems existing in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A reflector antenna for the Q / V band is characterized by comprising a support assembly, a main reflector, a support rod, a sub-reflector assembly, and a feed assembly. The main reflector is concentrically attached to the inner side of the support assembly. The sub-reflector assembly is mounted on the main reflector via the support rod, with the lower end of the support rod passing through the main reflector and fixedly connected to the support assembly. A through-hole is provided at the top of the main reflector, and the feed assembly passes through the through-hole. The feed assembly, sub-reflector, and main reflector are coaxially arranged. The support assembly, support rod, sub-reflector assembly, and feed assembly are all chamfered.

[0008] Preferably, the feed assembly includes a corrugated horn, a waveguide circular polarizer, a square-to-circular waveguide converter, and an orthogonal mode coupler. Waveguide circular polarizers are spaced apart within the via. A corrugated horn is fitted to the termination end of each waveguide circular polarizer. The feed port at the termination end of the corrugated horn is positioned opposite to the sub-reflector assembly. The starting end of the waveguide circular polarizer is fitted to the termination end of the square-to-circular waveguide converter. The starting end of the square-to-circular waveguide converter is connected to the termination end of the orthogonal mode coupler. The starting end of the orthogonal mode coupler has three antenna ports for transmitting electromagnetic signals.

[0009] Preferably, the waveguide circular polarizer has two sets of mutually orthogonal long ridges and short ridges. The long ridges and short ridges are arranged in a stepped transition from the middle to both ends, and the vertical and horizontal dimensions of the long ridges / short ridges are inconsistent.

[0010] Preferably, the corrugated horn has four sets of periodic annular corrugated grooves inside, the grooves having a depth of 2mm and a width of 1mm to 1.05mm.

[0011] Preferably, the support assembly includes an integrally formed support frame and fixed protrusions. The support frame has multiple hollowed-out areas evenly distributed along the circumference. Three sets of fixed protrusions are evenly distributed on the outer side of the support frame, and clearance holes are provided on the inner side of the fixed protrusions.

[0012] Preferably, the sub-reflector assembly includes an integrally formed sub-reflector surface and a mounting flange. The upper end of the mounting flange is provided with three sets of two opposing mounting blocks, and the lower end of the mounting flange is provided with a sub-reflector surface. The sub-reflector surface is an arc surface structure formed by rotating an elliptical curve around the central axis of the feed assembly.

[0013] Preferably, there are three support rods. The upper ends of the support rods are parallel and fixedly attached to the upper end of the mounting flange, and the lower ends of the support rods pass through the main reflective surface and the clearance hole in sequence before being fixedly connected to the fixed convex corner.

[0014] Preferably, the primary reflecting surface is a parabola of the yoz plane. It is obtained by rotating around the main axis, with z as the main axis and a focal diameter ratio of 0.25.

[0015] Preferably, the ratio of the outer ring diameters of the primary reflective surface and the secondary reflective surface is 8:1.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention has a main reflective surface concentrically attached to the inner side of the support assembly, and a secondary reflective assembly is mounted on the main reflective surface by a support rod. The lower end of the support rod passes through the main reflective surface and is fixedly connected to the support assembly. A through hole is provided at the top of the main reflective surface, and a feed assembly is inserted through the through hole. The feed assembly, the secondary reflective surface and the main reflective surface are coaxially arranged. The support assembly, the support rod, the secondary reflective assembly and the feed assembly are all chamfered. This invention features a simple feed assembly that is easy to process and manufacture, reducing the manufacturing and installation costs of the reflector antenna and eliminating the need for additional expensive materials to process the feed assembly. By employing a four-ridged waveguide circular polarizer, orthogonal coupler, and corrugated horn, this invention effectively broadens the bandwidth of the reflector antenna, achieving high port isolation and cross-polarization isolation, enabling multiplexing in satellite communication systems. Both the main and sub-reflectors utilize a focal ring antenna reflector design, which, unlike traditional reflector antennas, effectively reduces the obstruction and influence of the sub-reflector on the electromagnetic signals radiated from the main reflector, improving the overall performance of the reflector antenna and achieving high gain, wide bandwidth, low sidelobes, and lightweight design. Attached Figure Description

[0017] Figure 1 This is one of the overall structural schematic diagrams of this utility model.

[0018] Figure 2 This is the second schematic diagram of the overall structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the sub-reflector component of this utility model.

[0020] Figure 4 For the present utility model Figure 3 A sectional view.

[0021] Figure 5 This is a schematic diagram of the structure of the corrugated horn and waveguide circular polarizer of this utility model.

[0022] Figure 6 For the present utility model Figure 5 Top view.

[0023] Figure 7 For the present utility model Figure 6 A sectional view along line AA.

[0024] Figure 8 For the present utility model Figure 6 BB-direction sectional view.

[0025] Figure 9 This is a split diagram of the orthogonal mode coupler of this utility model.

[0026] Figure 10 This is a schematic diagram of the VSWR of the feed component antenna of this utility model.

[0027] Figure 11 This is a schematic diagram showing the isolation between the two ports of the feed assembly of the utility model.

[0028] Figures 12a-12d The antenna radiation patterns at various frequencies are obtained by inputting electromagnetic signals to antenna port one and antenna port two of the feed assembly of this utility model.

[0029] Figures 13a-13d This is the axial ratio radiation pattern of antenna port one and antenna port two of the feed assembly of this utility model.

[0030] Figures 14a-14h This is the overall radiation performance pattern of this utility model.

[0031] Figures 15a-15h This is the axial ratio orientation diagram of this utility model.

[0032] Figures 16a-16b This is a schematic diagram of the cross-polarization isolation at various frequency points of this utility model. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 9 As shown, the reflector antenna applied to the Q / V band includes a main reflector 1, a support rod 2, a corrugated horn 3, a waveguide circular polarizer 4, a square-to-circular waveguide converter 5, an orthogonal mode coupler 6, antenna port one 71, antenna port two 72, antenna port three 73, a long ridge 8, a short ridge 9, a corrugated groove 10, a support frame 11, a fixed convex angle 12, a sub-reflector 13, and a mounting flange 14.

[0035] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figures 1 to 9 As shown, a reflector antenna for the Q / V band includes a support assembly, a main reflector 1, a support rod 2, a sub-reflector assembly, and a feed assembly. The main reflector 1 is concentrically attached to the inner side of the support assembly. The ratio of the outer ring diameters of the main reflector 1 and the sub-reflector 13 is 8:1. In a three-dimensional coordinate system, the z-axis is the principal axis, and the main reflector 1 is formed by a parabola from the yoz plane. The diameter of the xoz plane is obtained by rotating around the principal axis, with the focus located in the xoz plane. On the ring, the focal length of the primary reflector 1 is F=100mm, and the focal diameter ratio is 0.25. The projection of the primary reflector 1 in the top view is a ring, with an outer ring diameter of [missing information]. It is approximately 50 times the wavelength of low-frequency frequencies, and the inner ring diameter is... Sub-reflector 13 is formed by an elliptical line segment of the yoz plane. The ellipse, obtained by rotating around the principal axis, has two foci. One coincides with the focus of the primary reflector 1, and the other is located at the phase center of the feed assembly. Its top-view projection is circular, with an outer ring diameter of [missing information]. .

[0038] A sub-reflector assembly is mounted on the main reflector 1 via a support rod 2. The lower end of the support rod 2 passes through the main reflector 1 and is fixedly connected to the support assembly. A through hole is provided at the top of the main reflector 1, through which a feed assembly is installed. The feed assembly, sub-reflector 13, and main reflector 1 are coaxially arranged. Electromagnetic signals are emitted by the feed assembly, radiated to the sub-reflector 13, and then reflected a second time by the sub-reflector 13 back to the main reflector 1. Finally, the main reflector 1 radiates high-gain electromagnetic waves towards the target direction. The main reflector 1 is parabolic, while the sub-reflector 13 adopts an elliptical curve structure formed around the antenna's central axis. This design ensures that the electromagnetic waves emitted by the feed assembly are reflected back to the main reflector 1 after reaching the sub-reflector 13, and then emitted into the electromagnetic space by the main reflector 1. External electromagnetic signals reach the main reflector 1, are reflected back to the sub-reflector 13, and then radiated by the sub-reflector 13 to the feed assembly for reception. During the antenna transmission / reception process of the main reflector 1 and the sub-reflector 13, the electromagnetic wave path will not be partially blocked by the sub-reflector 13 as in a traditional parabolic antenna, causing antenna energy loss. This greatly reduces the impact of the structure on the gain during radiation.

[0039] The support components, support rod 2, sub-reflector components, and feed components are all chamfered to reduce parasitic capacitance and inductance caused by right angles, enhance impedance continuity, reduce high-frequency signal reflection, and improve bandwidth, transmission efficiency, and stability.

[0040] The feed assembly includes a corrugated horn 3, a waveguide circular polarizer 4, a square-to-circular waveguide converter 5, and an orthogonal mode coupler 6. Waveguide circular polarizers 4 are spaced within the vias. These 4 are primarily used to convert linearly polarized waves into circularly polarized waves. In this embodiment, a circular waveguide structure made of metal is used. The inner wall of the waveguide circular polarizer 4 is loaded with two pairs of mutually orthogonal long ridges 8 and short ridges 9. The long ridges 8 and short ridges 9 on opposite walls have the same dimensions, while the vertical and horizontal ridges have different dimensions. By adjusting parameters, the propagation constants of the two orthogonally polarized waves are changed, achieving the output of circularly polarized waves. The ridge structure adopts a stepped transition structure, effectively improving impedance matching capability, optimizing device bandwidth and standing wave performance. The height and length of the long ridges 8 and short ridges 9 can be adjusted according to specific required parameters, ensuring that the electromagnetic waves entering the waveguide circular polarizer 4 have a phase difference of approximately 90 degrees in the orthogonal directions, guaranteeing good axial ratio characteristics, efficiently transmitting high-frequency signals, and effectively improving the polarization matching degree of electromagnetic waves at different receiving angles during satellite communication.

[0041] A corrugated horn 3 is fitted to the termination end of the waveguide circular polarizer 4. The feed port at the termination end of the corrugated horn 3 is positioned opposite to the sub-reflector assembly. The corrugated horn 3 has four sets of periodic annular corrugated slots 10, with a slot depth of 2 mm and a slot width of 1 mm to 1.05 mm. The aperture of the corrugated horn 3 faces the sub-reflector 13, and its diameter is larger than the low-frequency wavelength. The inner wall of the corrugated horn 3 is machined with periodic corrugated slots 10, and the slot depth of the corrugated slots 10 is approximately 1 / 4 of the low-frequency wavelength. This allows the electromagnetic signal to propagate in a mixed-mode form, enabling the electromagnetic signal emitted by the feed assembly to have extremely low sidelobe levels, a highly symmetrical radiation beam, and extremely low cross-polarization. By controlling the slot depth of the corrugated slots 10, the high- and low-frequency performance is balanced, ensuring that the phase centers of the high and low frequencies are basically consistent, thus achieving a wide bandwidth and high gain for the reflector antenna. From the input end to the output end of the corrugated horn 3, its aperture gradually increases. This gradual transition structure reduces the impedance change rate during electromagnetic wave transmission by gradually changing the size of the electromagnetic wave transmission aperture, thereby reducing reflection and standing waves, and effectively improving the bandwidth range of the feed component and the transmission and reception efficiency of the reflector antenna.

[0042] The starting end of the waveguide circular polarizer 4 is adapted to the ending end of the square-circular waveguide converter 5. The starting end of the square-circular waveguide converter 5 is connected to the ending end of the orthogonal mode coupler 6, which converts the electromagnetic wave propagating in the square waveguide into the degenerate mode TE11 in the circular waveguide. This effectively connects the waveguide circular polarizer 4 and the orthogonal mode coupler 6. The transition section adopts a linear transition method, which is simple in structure and has good transition performance.

[0043] The orthogonal mode coupler 6 has three antenna ports at its starting end, which are used to transmit electromagnetic signals. Specifically, the three antenna ports include antenna port one 71, antenna port two 72, and antenna port three 73. Antenna port one 71 is the port where the plane of the orthogonal mode coupler is parallel to the plane of the output port; antenna port two 72 is the port where the plane of the orthogonal mode coupler is perpendicular to the output end; and antenna port three 73 represents the output port of the orthogonal mode coupler. Its common output end is a square waveguide, and its input end is a rectangular waveguide. The output terminal is connected to the input terminal of the square-circular waveguide converter 5. Two input ports receive electromagnetic wave signals in TE10 and TE01 modes respectively. The TE10 mode signal input at antenna port 1 (71) undergoes internal stepped transformation and turning structures before reaching the output port. The turning structures of the orthogonal mode coupler 6 also feature rounded corners, achieving good impedance matching and improving transmission performance. The TE01 mode signal input at antenna port 2 (72) undergoes trapezoidal step transformation at the corner and two rows of ridge-shaped stepped steps on the left and right planes of the square waveguide to ensure the propagation of the TE01 mode signal without affecting the excitation of the TE10 mode. The two fundamental mode ports of the orthogonal mode coupler 6 use BJ400 standard rectangular waveguide interfaces with dimensions of 5.69mm * 2.845mm, while the common waveguide port uses a square waveguide with an inner diameter of 5.69mm.

[0044] The electromagnetic signal is transformed into two orthogonal electromagnetic signals through the two ports of the orthogonal mode coupler 6, which effectively improves the isolation between the ports; the waveguide circular polarizer 4 adopts a four-ridge waveguide circular polarizer 4, and by adjusting the four ridge structures located on the inner wall of the waveguide circular polarizer 4, the linear polarization signal is converted into a circular polarization signal.

[0045] The waveguide circular polarizer 4 has two sets of mutually orthogonal long ridges 8 and short ridges 9. Both long ridges 8 and short ridges 9 are arranged in a stepped transition from the middle to both ends. The vertical and horizontal dimensions of the long ridges 8 and short ridges 9 are inconsistent.

[0046] The support assembly includes an integrally formed support frame 11 and fixed protrusions 12. The support frame 11 has multiple evenly distributed perforations along its circumference. Three sets of fixed protrusions 12 are evenly distributed on the outer side of the support frame 11, and clearance holes are provided on the inner side of the fixed protrusions 12. The sub-reflector assembly includes an integrally formed sub-reflector surface 13 and a mounting flange 14. Three sets of two opposing mounting blocks are evenly distributed on the upper end of the mounting flange 14, and the sub-reflector surface 13 is located at the lower end of the mounting flange 14. The sub-reflector surface 13 is an arc surface structure formed by rotating an elliptical curve around the central axis of the feed assembly.

[0047] There are three support rods 2. The upper ends of the support rods 2 are parallel to and fixedly attached to the upper end of the mounting flange 14. The lower ends of the support rods 2 pass through the main reflector 1 and the clearance hole in sequence before being fixedly connected to the fixed convex corner 12. The initial position of the support frame 11 is located above the sub-reflector 13. After being extended parallel to the main reflector 1, it is obliquely connected to the main reflector 1 to fix the position of the sub-reflector 13 and ensure that it will not be offset, thus affecting the antenna accuracy. At the same time, since the antenna main reflector 1 is circular, only a structure of 3 support rods 2 is used instead of the conventional 4 rods in the prior art. This embodiment ensures the stability of the reflector antenna while minimizing the impact of the support rods on the performance of the reflector antenna.

[0048] like Figure 10 As shown, the standing wave ratios at both ports of the feed assembly are less than 1.4 within the operating frequency band, ensuring excellent impedance matching of the reflector antenna within the operating frequency band; Figure 11 It can be seen that the isolation between the two ports of the feed component is less than -20dB, which effectively prevents mutual interference and performance loss caused by insufficient isolation between the ports.

[0049] Figure 12a The antenna pattern of antenna port 71 of the feed assembly (phi=0°); Figure 12b The antenna pattern (phi=90°) is shown at antenna port 71 of the feed assembly. Figure 12c The antenna pattern of antenna port 2 72 of the feed assembly (phi=0°); Figure 12d The antenna pattern (phi=90°) is shown for antenna port 2 72 of the feed assembly.

[0050] Figure 13a The axial ratio pattern of antenna port 71 of the feed assembly (phi=0°); Figure 13b The axial ratio radiation pattern of antenna port 71 of the feed assembly (phi=90°); Figure 13c The axial ratio pattern of antenna port 72 of the feed assembly (phi=0°); Figure 13d The axial ratio pattern of antenna port 2 72 of the feed assembly is shown (phi = 90°).

[0051] Depend on Figures 12a to 13d It can be seen that the feed component has a high antenna gain in the normal direction, with the maximum gain at each frequency point being greater than 14.5 dBi. In the direction of maximum radiation, the axial ratio is less than 1 dB, the circular polarization is excellent, and it has good symmetry. In the feed stage, it lays the foundation for the overall radiation performance of the reflector antenna.

[0052] Figure 14a The antenna pattern at antenna port 71 (f=37.5, phi=0°); Figure 14bThe antenna pattern at antenna port 71 (f=37.5, phi=90°); Figure 14c The antenna pattern at antenna port 71 (f=47.2, phi=0°); Figure 14d The antenna pattern at antenna port 71 (f=47.2, phi=90°). Figure 14e The antenna pattern at antenna port 2 72 (f=37.5, phi=0°); Figure 14f The antenna pattern at antenna port 2 72 (f=37.5, phi=90°) Figure 14g The antenna pattern at antenna port 2 72 (f=47.2, phi=0°); Figure 14h The antenna pattern at antenna port 2 72 is shown (f=47.2, phi=90°).

[0053] Figure 15a The axial ratio radiation pattern of antenna port 71 (f=37.5, phi=0°); Figure 15b The axial ratio radiation pattern of antenna port 71 (f=37.5, phi=90°); Figure 15c The axial ratio radiation pattern of antenna port 71 (f=47.2, phi=0°); Figure 15d The axial ratio radiation pattern of antenna port 71 (f=47.2, phi=90°). Figure 15e The axial ratio radiation pattern of antenna port 2 72 (f=37.5, phi=0°); Figure 15f The axial ratio radiation pattern of antenna port 2 72 (f=37.5, phi=90°); Figure 15g The axial ratio radiation pattern of antenna port 2 72 (f=47.2, phi=0°); Figure 15h The axial ratio radiation pattern of antenna port 272 is shown (f=47.2, phi=90°).

[0054] Figure 16a This is a schematic diagram of the cross-polarization of antenna port 71. Figure 16b This is a schematic diagram of the cross-polarization of antenna port 2 72.

[0055] Depend on Figures 15a to 16bAs can be seen, the reflector antenna of this utility model, within the operating frequency band, achieves a maximum gain of 41.3 dBi at the selected low frequency point of 37.5 GHz and a maximum gain of 42.8 dBi at the selected high frequency point of 47.2 GHz when the signal is input at antenna port 71; and a maximum gain of 41.2 dBi at the selected low frequency point of 37.5 GHz and a maximum gain of 42.9 dBi at the selected high frequency point of 47.2 GHz when the signal is input at antenna port 72. Both ports have an axial ratio of less than 1.3 dB, maintaining good circular polarization capability, while the cross-polarization isolation is greater than 25 dB, effectively reducing the mutual influence of different polarizations and improving the overall stability of the antenna system.

[0056] This invention achieves wide-bandwidth antenna operation within a limited space, with a relative bandwidth of approximately 30%, while also ensuring high antenna gain. Specifically, the antenna gain reaches 41.3 dBi at the lower sideband and 43.3 dBi at the upper sideband. In addition to ensuring wide bandwidth and high gain, this invention also achieves good cross-polarization characteristics and axial ratio, effectively guaranteeing the transmission and reception of electromagnetic waves in space.

[0057] The feed assembly of this invention is simple, easy to process and manufacture, reducing the manufacturing and installation costs of the reflector antenna and eliminating the need for additional expensive materials to process the feed assembly. This invention effectively broadens the bandwidth of the reflector antenna by using a four-ridged waveguide circular polarizer 4, an orthogonal coupler, and a corrugated horn 3, achieving high port isolation and cross-polarization isolation, thus enabling multiplexing in satellite communication systems. Both the main reflector 1 and the sub-reflector 13 adopt a focal ring antenna reflector design, which, unlike traditional reflector antennas, effectively reduces the obstruction and influence of the sub-reflector 13 on the electromagnetic signals radiated by the main reflector 1, improving the overall performance of the reflector antenna and achieving high gain, wide bandwidth, low sidelobes, and lightweight design.

[0058] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any modifications, equivalent changes, or improvements made in accordance with the claims of this utility model shall still fall within the scope of this utility model.

Claims

1. A reflector antenna for use in the Q / V band, characterized in that: The system includes a support assembly, a main reflector (1), a support rod (2), a sub-reflector assembly, and a feed assembly. The main reflector (1) is concentrically attached to the inner side of the support assembly. The sub-reflector assembly is mounted on the main reflector (1) via the support rod (2). The lower end of the support rod (2) passes through the main reflector (1) and is fixedly connected to the support assembly. A through hole is provided at the top of the main reflector (1), and the feed assembly passes through the through hole. The feed assembly, the sub-reflector (13), and the main reflector (1) are coaxially arranged. The support assembly, the support rod (2), the sub-reflector assembly, and the feed assembly are all chamfered.

2. The reflector antenna for the Q / V band according to claim 1, characterized in that: The feed assembly includes a corrugated horn (3), a waveguide circular polarizer (4), a square-circular waveguide converter (5), and an orthogonal mode coupler (6). The waveguide circular polarizer (4) is spaced apart in the via. The waveguide circular polarizer (4) is fitted with a corrugated horn (3) at its end. The feed port at the end of the corrugated horn (3) is opposite to the sub-reflection assembly. The starting end of the waveguide circular polarizer (4) is fitted and connected to the ending end of the square-circular waveguide converter (5). The starting end of the square-circular waveguide converter (5) is connected to the ending end of the orthogonal mode coupler (6). The starting end of the orthogonal mode coupler (6) is provided with three antenna ports, which are used to transmit electromagnetic signals.

3. A reflector antenna for the Q / V band according to claim 2, characterized in that: The waveguide circular polarizer (4) has two sets of mutually orthogonal long ridges (8) and short ridges (9). The long ridges (8) and short ridges (9) are arranged in a stepped transition from the middle to both ends. The vertical and horizontal dimensions of the long ridges (8) and short ridges (9) are inconsistent.

4. A reflector antenna for the Q / V band according to claim 3, characterized in that: The corrugated horn (3) is provided with four sets of periodic annular corrugated grooves (10), the groove depth of which is 2mm and the groove width is 1mm~1.05mm.

5. A reflector antenna for the Q / V band according to claim 3 or 4, characterized in that: The support assembly includes an integrally formed support frame (11) and fixed protrusions (12). The support frame (11) has multiple hollowed-out areas evenly distributed along the circumference. Three sets of fixed protrusions (12) are evenly distributed on the outer side of the support frame (11). The inner side of the fixed protrusions (12) is provided with clearance holes.

6. A reflector antenna for the Q / V band according to claim 5, characterized in that: The sub-reflection assembly includes an integrally formed sub-reflection surface (13) and a mounting flange (14). The upper end of the mounting flange (14) is provided with three sets of two opposing mounting blocks. The lower end of the mounting flange (14) is provided with the sub-reflection surface (13). The sub-reflection surface (13) is an arc surface structure formed by rotating an elliptical curve around the central axis of the feed assembly.

7. A reflector antenna for the Q / V band according to claim 6, characterized in that: There are three support rods (2). The upper end of the support rod (2) is parallel and fixedly attached to the upper end of the mounting flange (14). The lower end of the support rod (2) passes through the main reflective surface (1) and the clearance hole in sequence before being fixedly connected to the fixed convex corner (12).

8. A reflector antenna for the Q / V band according to claim 7, characterized in that: The main reflecting surface (1) is a parabola of the yoz plane. It is obtained by rotating around the main axis, with z as the main axis and a focal diameter ratio of 0.

25.

9. A reflector antenna for the Q / V band according to claim 8, characterized in that: The ratio of the outer ring diameter of the main reflective surface (1) to the sub-reflective surface (13) is 8:1.

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