Weather radar and assembly method thereof

Abstract

The present invention discloses a weather radar and an assembly method thereof, wherein the weather radar comprises a radar body, a servo assembly and an array antenna, wherein the radar body comprises a signal processing unit, a frequency synthesis assembly, an intermediate frequency assembly, a power division assembly and a T / R assembly; the array antenna comprises a reflector, a plurality of umbrella-shaped dipole antenna units and a feed network PCB, and a plurality of cross-shaped slots are provided on the reflector; each umbrella-shaped dipole antenna unit comprises a first radiation unit and a second radiation unit, the first radiation unit is inserted into the second radiation unit, and the first radiation unit and the second radiation unit are orthogonally engaged; the first radiation unit and the second radiation unit are inserted into the corresponding cross-shaped slots; the second radiation unit of each umbrella-shaped dipole antenna unit is integrated with the feed network PCB. The present invention ensures the orthogonal installation of the first radiation unit and the second radiation unit through the limiting of the cross-shaped slot, thereby simplifying the antenna assembly process.

Description

Technical Field

[0001] The invention belongs to the technical field of meteorological radars, and in particular relates to a meteorological radar and an assembly method thereof. Background Art

[0002] In weather radar systems, array antennas are crucial to improving radar performance. Array antennas can effectively identify and measure multiple targets in different directions through adaptive beamforming technology. Array antenna technology enables radar systems to detect and track targets more accurately, improving the accuracy and efficiency of target detection and tracking. In addition, array antenna technology can also improve the anti-interference ability of radar systems, so that they can still maintain good working results in harsh electromagnetic environments; the application of array signal processing technology, such as beamforming, spatial filtering, and direction estimation, can improve the target detection performance, anti-interference ability, and resolution of radar systems. Therefore, the development of array antenna technology is crucial to modern radar systems. They not only improve the performance of radars, but also enhance the versatility and adaptability of radar systems.

[0003] Array antennas are one of the key technologies due to their excellent directivity and gain coefficient. However, as an important category of array antennas, the design and assembly process of printed umbrella dipole antenna units are still challenging, which significantly increases the difficulty and workload of assembling the entire radar. Especially in the design of dual-polarization radars, in order to achieve the orthogonal independent installation of the two polarization oscillator units, it is usually necessary to use insulators or other connectors for transfer and fix them with angle code structural parts. This process is particularly complicated when processing large array antennas. Due to the large number of oscillator units, the assembly process becomes cumbersome and time-consuming. In addition, the difference in heat dissipation performance between the metal plate and the printed circuit board as a reflector also leads to welding difficulties, further increasing the complexity of assembly. These problems not only affect the production efficiency of the array antenna, but may also affect the performance and reliability of the radar. Therefore, simplifying the assembly process of the array antenna and optimizing the heat dissipation design have become the key to improving the efficiency of radar assembly and reducing the workload. Summary of the invention

[0004] The object of the present invention is to provide a weather radar and an assembly method thereof to solve at least one of the problems of complex installation of the vibrator unit in the traditional solution and the difficulty of welding caused by inconsistent heat dissipation between the metal plate and the printed circuit board.

[0005] The present invention solves the above technical problems through the following technical solutions: A meteorological radar comprises a radar body, a servo component for adjusting the radar azimuth and an array antenna, wherein the radar body comprises a signal processing unit and a frequency synthesis component, an intermediate frequency component, a power division component and a T / R component connected in sequence; the signal processing unit is connected to the frequency synthesis component, the intermediate frequency component and the T / R component, and the T / R component is connected to the array antenna;

[0006] The array antenna includes a reflector, a plurality of umbrella-shaped dipole antenna units and a feed network PCB. A plurality of cross-shaped slots are provided on the reflector, and each cross-shaped slot corresponds to an umbrella-shaped dipole antenna unit; each of the umbrella-shaped dipole antenna units includes a first radiating unit and a second radiating unit, and the first radiating unit is inserted into the second radiating unit, and the first radiating unit is orthogonally engaged with the second radiating unit; the first radiating unit and the second radiating unit are inserted into the corresponding cross-shaped slots; the second radiating unit of each umbrella-shaped dipole antenna unit is integrated with the feed network PCB.

[0007] Further, the first radiation unit includes a first substrate and a second substrate which are stacked, and first dipole arms arranged on both sides of the upper parts of the first substrate and the second substrate; a first slot is opened at the lower part of the middle position of the first radiation unit, a first window is opened at one side of the bottom of the first slot, a first microstrip feeder is arranged at the first window, and the first microstrip feeder is connected to a first strip feeder, and the first strip feeder is located between the first substrate and the second substrate; a first gap is opened at one side of the first window close to the first slot;

[0008] The second radiation unit includes a third substrate and a fourth substrate stacked together, and second dipole arms disposed on both sides of the upper portions of the third substrate and the fourth substrate; a second slot is provided at the upper portion of the middle portion of the second radiation unit, and a second strip feeder is provided between the third substrate and the fourth substrate;

[0009] The feed network PCB includes a fifth substrate and a sixth substrate stacked in layers, and a first feed network and a second feed network arranged between the fifth substrate and the sixth substrate, the fifth substrate is designed as an integrated whole with each third substrate, and the sixth substrate is designed as an integrated whole with each fourth substrate; the first feed network is used to feed each first radiation unit, and the second feed network is designed as an integrated whole with each second strip feeder and is used to feed each second radiation unit; a plurality of second windows are provided on one side of the fifth substrate and the sixth substrate close to the second radiation unit, a second microstrip feeder is provided in each of the second windows, and the second microstrip feeder is connected to the first feed network; a second gap is provided on one side of each of the second windows; the number of the second windows matches the number of umbrella dipole antenna units;

[0010] When the first radiation unit is inserted on the second radiation unit, the second microstrip feed line contacts the first microstrip feed line, the second substrate corresponding to the first window is inserted into the second gap; and the sixth substrate corresponding to the second window is inserted into the first gap.

[0011] Furthermore, the first microstrip feeder is obtained by removing the upper dielectric layer of the portion of the first strip feeder exposed by the first window; the second microstrip feeder is obtained by removing the upper dielectric layer of the portion of the third strip feeder exposed by the second window, and the first feeding network includes the third strip feeder.

[0012] Further, the width of the first groove is equal to the sum of the thicknesses of the third substrate and the fourth substrate, and the depth of the first groove is equal to the height of the third substrate or the fourth substrate below the second groove;

[0013] The width of the second groove is equal to the sum of the thicknesses of the first substrate and the second substrate, and the depth of the second groove is equal to the height of the first substrate or the second substrate above the first groove.

[0014] Furthermore, the width of the first gap is equal to the thickness of the sixth substrate; the width of the second gap is equal to the thickness of the second substrate.

[0015] Furthermore, the first feeding network and the second feeding network are both power division networks, and the two power division networks are arranged back to back.

[0016] Furthermore, the first stage of the power division network adopts a Wilkinson power divider, and the other stages adopt T-type power dividers.

[0017] Furthermore, the width and length of the cross-shaped slot are consistent with the width and length of corresponding positions of the first radiation unit and the second radiation unit.

[0018] Furthermore, the multiple cross-shaped grooves on the reflection plate are arranged in a straight line, and the reflection plate is a PCB board.

[0019] Based on the same concept, the present invention provides an assembly method of the weather radar as described above, comprising:

[0020] Insert all the second radiation units integrated with the feed network PCB into the corresponding cross-shaped slots of the reflector;

[0021] Insert each first radiation unit into the corresponding second radiation unit and the corresponding cross slot of the reflection plate;

[0022] Soldering the first microstrip feed line of the first radiation unit and the second microstrip feed line of the feed network PCB together;

[0023] Welding the corresponding cross-shaped slots, the first radiation unit, and the second radiation unit together to complete the assembly of the array antenna;

[0024] The array antenna is mounted on a radar body. Beneficial Effects

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] The present invention limits the first radiation unit and the second radiation unit of two polarizations by opening a cross-shaped groove on the reflecting plate, ensures the orthogonal installation of the first radiation unit and the second radiation unit, and simplifies the installation operation of the first radiation unit and the second radiation unit; by opening a first window on the first radiation unit and a second window on the feeding network PCB, the feeding microstrip is structurally connected with the feeding point of the first radiation unit, and finally the radiation units are installed and positioned in batches by welding, which greatly simplifies the assembly process of the umbrella dipole array antenna and greatly improves the assembly efficiency.

[0027] The reflector of the present invention adopts a PCB board, which effectively solves the problem of inconsistent heat dissipation between the metal plate and the printed circuit board caused by using a metal plate as the reflector, and further solves the problem of welding difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a structural block diagram of a weather radar in an embodiment of the present invention;

[0030] Figure 2 is a front view of an assembled array antenna according to an embodiment of the present invention;

[0031] Figure 3 is a side view of an assembled array antenna according to an embodiment of the present invention;

[0032] Figure 4 is an oblique view of an assembled array antenna according to an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of the structure of a reflector in an embodiment of the present invention;

[0034] Figure 6 is a schematic structural diagram of a first radiation unit in an embodiment of the present invention;

[0035] Figure 7is a schematic structural diagram of a second radiation unit in an embodiment of the present invention;

[0036] Figure 8 is a schematic diagram of a feed network PCB in an embodiment of the present invention;

[0037] Fig. 9 is a first partial enlarged view of the feed network PCB in an embodiment of the present invention;

[0038] Fig.10 is a second partial enlarged view of the feed network PCB in an embodiment of the present invention;

[0039] Fig.11 It is a schematic diagram of the first radiation unit and the second radiation unit after being assembled in an embodiment of the present invention.

[0040] Explanation of the accompanying drawings: 1-reflection plate, 101-cross-shaped groove, 2-first radiation unit, 201-first dipole arm, 202-first groove, 203-second substrate, 204-first substrate, 205-first window, 206-first microstrip feed line, 207-first gap, 208-first strip feed line, 3-second radiation unit, 301-second dipole arm, 302-second groove, 303-second strip feed line, 4-feeding network PCB, 401-first feeding network, 402-second feeding network, 403-second window, 404-second microstrip feed line, 405-second gap, 406-fifth substrate, 407-sixth substrate. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0043] like Figure 1As shown, a meteorological radar provided by an embodiment of the present invention includes a radar body, a servo component and an array antenna. The radar body includes a signal processing unit and a frequency synthesis component, an intermediate frequency component, a power division component and a T / R component connected in sequence; the signal processing unit is connected to the frequency synthesis component, the intermediate frequency component and the T / R component, and the T / R component is connected to the array antenna. Among them, the servo component includes a servo motor, which provides the radar with azimuth adjustment capability through the servo motor, so that the radar can cover all azimuths; the frequency synthesis component is used to generate and provide stable and accurate frequency signals for the radar as a whole, and the frequency signals include local oscillator signals and intermediate frequency signals; the intermediate frequency component is used to up- and down-convert the frequency signals to meet the frequency requirements of other components; the power division component is used to divide a single frequency signal into multiple frequency signals and provide them to the T / R component; the T / R component is used to adjust the signal amplitude and phase, thereby realizing the scanning function of the beam in space, and is used to transmit high-power RF signals and amplify the power of received weak signals, and at the same time realize the radar's transmit and receive switching; the array antenna is used to radiate signals externally and receive signals; the signal processing unit is used to convert and process the received analog signals; the power supply component and server are used to power each component, store radar scanning signals and control the radar functions.

[0044] like Figures 2 to 5 as well as Fig.11 As shown, the array antenna includes a reflector 1, a plurality of umbrella dipole antenna units and a feed network PCB 4 (Printed Circuit Board). A plurality of cross slots 101 are provided on the reflector 1, and each cross slot 101 corresponds to an umbrella dipole antenna unit; each umbrella dipole antenna unit includes a first radiating unit 2 and a second radiating unit 3, and the first radiating unit 2 is inserted into the second radiating unit 3, and the first radiating unit 2 is orthogonally engaged with the second radiating unit 3; the first radiating unit 2 and the second radiating unit 3 are inserted into the corresponding cross slots 101; the second radiating unit 3 of each umbrella dipole antenna unit is integrated with the feed network PCB 4.

[0045] Taking a 16-unit narrow beam array antenna with low sidelobe shaping requirements as an example, the number of umbrella-shaped dipole antenna units is 16, and the number of cross-shaped slots 101 on the reflector 1 is also 16.

[0046] like Figure 6As shown, the first radiation unit 2 includes a first substrate 204 and a second substrate 203 which are stacked, and a first dipole arm 201 arranged on both sides of the upper parts of the first substrate 204 and the second substrate 203; a first groove 202 is opened at the lower part of the middle position of the first radiation unit 2, a first window 205 is opened on one side of the bottom of the first groove 202, a first microstrip feed line 206 is provided in the first window 205, and the first microstrip feed line 206 is connected to the first strip feed line 208, and the first strip feed line 208 is located between the first substrate 204 and the second substrate 203; a first gap 207 is opened on one side of the first window 205 close to the first groove 202.

[0047] The width of the first slot 202 matches the sum of the thickness of the third substrate and the fourth substrate of the second radiation unit 3 , so that the first radiation unit 2 can be inserted into the second radiation unit 3 through the first slot 202 , and the first radiation unit 2 and the second radiation unit 3 are orthogonally engaged.

[0048] A portion of the first substrate 204 on one side of the bottom of the first slot 202 is removed to obtain a first window 205; the second substrate 203 and the first strip feed line 208 are exposed through the first window 205, and then the upper dielectric layer of the exposed first strip feed line 208 is removed to obtain a first microstrip feed line 206. By converting the original portion of the first strip feed line 208 into the first microstrip feed line 206, it is ensured that the impedance between the first strip feed line 208 and the first microstrip feed line 206 will not be mismatched.

[0049] The first gap 207 is used to ensure that the first microstrip feed line 206 and the second microstrip feed line 404 can achieve zero-distance contact when the first radiation unit 2 and the second radiation unit 3 are assembled.

[0050] like Figure 7 As shown, the second radiation unit 3 includes a third substrate and a fourth substrate stacked together, and a second dipole arm 301 arranged on both sides of the upper portion of the third substrate and the fourth substrate; a second groove 302 is opened in the upper portion of the middle position of the second radiation unit 3, and a second strip feed line 303 is arranged between the third substrate and the fourth substrate.

[0051] The width of the second slot 302 is adapted to the sum of the thicknesses of the first substrate 204 and the second substrate 203 of the first radiation unit 2, so that the first radiation unit 2 is inserted into the second radiation unit 3 through the first slot 202 and the second slot 302, and the first radiation unit 2 is orthogonally engaged with the second radiation unit 3. In this embodiment, the depth of the first slot 202 is equal to the height of the third substrate or the fourth substrate below the second slot 302, and the depth of the second slot 302 is equal to the height of the first substrate 204 or the second substrate 203 above the first slot 202, so that after the first radiation unit 2 and the second radiation unit 3 are assembled, the tops of the two are flush. The second strip feeder 303 is used to connect to the second feeding network 402, so that the second feeding network 402 feeds the second radiation unit 3.

[0052] like Figures 7 to 10 As shown, the feed network PCB 4 includes a fifth substrate 406 and a sixth substrate 407 which are stacked, and a first feed network 401 and a second feed network 402 which are arranged between the fifth substrate 406 and the sixth substrate 407. The fifth substrate 406 is designed to be integrated with each third substrate, and the sixth substrate 407 is designed to be integrated with each fourth substrate. The first feed network 401 is used to feed each first radiation unit 2, and the second feed network 402 is designed to be integrated with each second strip feed line 303 and is used to feed each second radiation unit 3. A plurality of second windows 403 are provided on one side of the fifth substrate 406 and the sixth substrate 407 close to the second radiation unit 3, and a second microstrip feed line 404 is provided in each second window 403, and the second microstrip feed line 404 is connected to the first feed network 401. A second gap 405 is provided on one side of each second window 403. The number of the second windows 403 matches the number of the umbrella dipole antenna units.

[0053] The position of the second window 403 corresponds to the assembly position of the first radiation unit 2 on the feed network PCB 4. The fifth substrate 406 at this position is removed to obtain the second window 403. The sixth substrate 407 and part of the third strip feeder are exposed through the second window 403. The upper dielectric layer of the exposed third strip feeder is removed to obtain the second microstrip feeder 404. By transforming the original part of the third strip feeder design into the second microstrip feeder 404, it is ensured that the impedance between the third strip feeder and the second microstrip feeder 404 will not be mismatched. The third strip feeder belongs to the first feeding network 401, so the first feeding network 401 is connected to the second microstrip feeder 404. When the first radiation unit 2 and the second radiation unit 3 are assembled, the second microstrip feeder 404 contacts the first microstrip feeder 206, and then the first feeding network 401 is connected to the first strip feeder 208 through the second microstrip feeder 404 and the first microstrip feeder 206 in sequence, so as to realize the feeding of the first radiation unit 2; the second feeding network 402 and the second strip feeder 303 are themselves integrated designs, so as to directly realize the feeding of the second radiation unit 3 by the second feeding network 402.

[0054] The second gap 405 is used to ensure that the first microstrip feed line 206 and the second microstrip feed line 404 can achieve zero-distance contact when the first radiation unit 2 and the second radiation unit 3 are assembled.

[0055] like Fig.11 As shown, when the first radiation unit 2 is inserted on the second radiation unit 3, the second microstrip feed line 404 is in direct contact with the first microstrip feed line 206, and the second substrate 203 (i.e., the exposed second substrate 203) corresponding to the first window 205 is inserted into the second gap 405; the sixth substrate 407 (i.e., the exposed sixth substrate 407) corresponding to the second window 403 is inserted into the first gap 207.

[0056] In a specific embodiment of the present invention, the first feeding network 401 and the second feeding network 402 are both power division networks, and the two power division networks are arranged back to back. The first stage of the power division network adopts a Wilkinson power divider, and the other stages adopt a T-type power divider. This power division network can achieve better port impedance while meeting the shaping requirements.

[0057] In a specific embodiment of the present invention, the width and length of the cross-shaped slot 101 are consistent with the width and length of the corresponding positions of the first radiation unit 2 and the second radiation unit 3 to ensure the accuracy of the limiting.

[0058] In a specific embodiment of the present invention, the multiple cross-shaped grooves 101 on the reflector 1 are arranged in a straight line, and the reflector 1 is a PCB board, which solves the problem of difficulty in welding between the metal plate and the printed circuit board caused by the reflector 1 being a metal plate.

[0059] The present invention realizes positioning of the umbrella-shaped dipole antenna unit through the reflector 1 and the cross-shaped groove 101 on the reflector 1, thereby realizing rapid assembly; and realizes three-dimensional assembly of the feed port of the feed network and the feed port of the radiation unit through the first window 205 and the second window 403.

[0060] The assembly method of the weather radar in the embodiment of the present application includes:

[0061] Step 1: insert all the second radiation units 3 integrated with the feeding network PCB 4 into the corresponding cross-shaped slots 101 of the reflection plate 1;

[0062] Step 2: according to the direction of the first microstrip feed line 206 and the second microstrip feed line 404 on the same side, each first radiation unit 2 is inserted into the corresponding cross slot of the corresponding second radiation unit 3 and the reflector 1;

[0063] Step 3: Weld the corresponding first microstrip feed line 206 and the second microstrip feed line 404 together by manual welding or laser welding;

[0064] Step 4: Use manual welding or laser welding to weld the corresponding cross slots 101, the first radiation unit 2 and the second radiation unit 3 together to complete the assembly of the array antenna. Figures 2 to 4 As shown;

[0065] Step 5: Install the assembled array antenna on the radar body.

[0066] The present invention can realize batch installation and positioning of radiation units, greatly simplifying the assembly process of the array antenna.

[0067] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A weather radar, characterized in that: The weather radar comprises a radar body, a servo component for adjusting the radar azimuth, and an array antenna. The radar body comprises a signal processing unit and a frequency synthesis component, an intermediate frequency component, a power division component, and a T / R component connected in sequence; the signal processing unit is connected to the frequency synthesis component, the intermediate frequency component, and the T / R component, and the T / R component is connected to the array antenna; The array antenna comprises a reflector, a plurality of umbrella-shaped dipole antenna units and a feed network PCB, wherein a plurality of cross-shaped slots are arranged on the reflector, and each cross-shaped slot corresponds to an umbrella-shaped dipole antenna unit; each umbrella-shaped dipole antenna unit comprises a first radiating unit and a second radiating unit, wherein the first radiating unit is inserted into the second radiating unit, and the first radiating unit and the second radiating unit are orthogonally engaged; The first radiation unit and the second radiation unit are inserted into the corresponding cross-shaped slots; the second radiation unit of each umbrella-shaped dipole antenna unit is integrated with the feed network PCB; The first radiation unit includes a first substrate and a second substrate which are stacked, and first dipole arms which are arranged on both sides of the upper parts of the first substrate and the second substrate; A first slot is provided at a lower portion of a middle position of the first radiation unit, a first window is provided at one side of a bottom of the first slot, a first microstrip feeder is provided at the first window, and the first microstrip feeder is connected to a first strip feeder, and the first strip feeder is located between the first substrate and the second substrate; a first gap is provided at one side of the first window close to the first slot; The second radiation unit includes a third substrate and a fourth substrate stacked together, and second dipole arms disposed on both sides of the upper portions of the third substrate and the fourth substrate; a second slot is provided at the upper portion of the middle portion of the second radiation unit, and a second strip feeder is provided between the third substrate and the fourth substrate; The feed network PCB includes a fifth substrate and a sixth substrate which are stacked, and a first feed network and a second feed network which are arranged between the fifth substrate and the sixth substrate, wherein the fifth substrate is integrated with each third substrate, and the sixth substrate is integrated with each fourth substrate; The first feeding network is used to feed each first radiating unit, and the second feeding network is integrated with each second strip feeder and is used to feed each second radiating unit; A plurality of second windows are provided on one side of the fifth substrate and the sixth substrate close to the second radiation unit, a second microstrip feeder is provided in each of the second windows, and the second microstrip feeder is connected to the first feeding network; a second gap is provided on one side of each of the second windows; the number of the second windows matches the number of the umbrella dipole antenna units; When the first radiation unit is inserted on the second radiation unit, the second microstrip feed line contacts the first microstrip feed line, the second substrate corresponding to the first window is inserted into the second gap; and the sixth substrate corresponding to the second window is inserted into the first gap.

2. The weather radar according to claim 1, characterized in that: The first microstrip feed line is obtained by removing the upper dielectric layer of the portion of the first strip feed line exposed by the first window; the second microstrip feed line is obtained by removing the upper dielectric layer of the portion of the third strip feed line exposed by the second window, and the first feeding network includes the third strip feed line.

3. The weather radar according to claim 1, characterized in that: The width of the first groove is equal to the sum of the thicknesses of the third substrate and the fourth substrate, and the depth of the first groove is equal to the height of the third substrate or the fourth substrate below the second groove; The width of the second groove is equal to the sum of the thicknesses of the first substrate and the second substrate, and the depth of the second groove is equal to the height of the first substrate or the second substrate above the first groove.

4. The weather radar according to claim 1, characterized in that: The width of the first gap is equal to the thickness of the sixth substrate; the width of the second gap is equal to the thickness of the second substrate.

5. The weather radar according to any one of claims 1 to 4, characterized in that: The first feeding network and the second feeding network are both power division networks, and the two power division networks are arranged back to back.

6. The weather radar according to claim 5, characterized in that: The first stage of the power division network adopts Wilkinson power divider, and other stages adopt T-type power dividers.

7. The weather radar according to claim 1, characterized in that: The width and length of the cross-shaped slot are consistent with the width and length of the corresponding positions of the first radiation unit and the second radiation unit.

8. The weather radar according to claim 1, characterized in that: The multiple cross-shaped grooves on the reflection plate are arranged in a straight line, and the reflection plate is a PCB board.

9. A method for assembling a weather radar as claimed in any one of claims 1 to 8, characterized in that: The assembly method comprises: Insert all the second radiation units integrated with the feed network PCB into the corresponding cross-shaped slots of the reflector; Insert each first radiation unit into the corresponding second radiation unit and the corresponding cross slot of the reflection plate; Soldering the first microstrip feed line of the first radiation unit and the second microstrip feed line of the feed network PCB together; Welding the corresponding cross-shaped slots, the first radiation unit, and the second radiation unit together to complete the assembly of the array antenna; The array antenna is mounted on a radar body.

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