A structural device and installation method applied to a radar decoy antenna

Abstract

The present invention relates to the technical field of antenna structures, and particularly relates to a structural device and an installation method for an antenna applied to a radar decoy. In the present invention, a cylindrical fixing cylinder is fixed between an L-shaped cylindrical reflecting cylinder and an outer frame, and a microstrip antenna printed board is bent into a circular shape around the cylindrical fixing cylinder; threaded holes are arranged on the outer wall of the cylindrical fixing cylinder according to the positions of the through holes on the microstrip antenna printed board; the top of the outer frame is used to fix a reflecting plate, and the reflecting plate and the L-shaped cylindrical reflecting cylinder are perpendicular to each other. The present invention simplifies the overall structure and has the characteristics of few components, easy installation, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna structures, and particularly to a structural device and an installation method for a radar decoy antenna. Background Art

[0002] Omnidirectional antennas exhibit 360° uniform radiation in the horizontal radiation pattern. Generally, they are implemented by array antennas and matching networks, with many structural parts, complex installation and debugging, and large antenna structure sizes in the low-frequency band, resulting in large raw material requirements and difficult processing. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a structural device and an installation method for a radar decoy antenna. The present invention simplifies the overall structure, with characteristics such as few components, easy installation, and low cost.

[0004] The technical solution of the present invention is: A structural device for a radar decoy antenna, comprising a cylindrical fixed cylinder, a microstrip antenna printed circuit board, a reflector, an L-shaped cylindrical reflector, and an outer frame. The outer frame is installed at the edge of the bottom flange of the L-shaped cylindrical reflector; the outer diameter of the cylindrical fixed cylinder is 413.4 mm, the thickness is 4 mm, the inner diameter of the bottom flange is 380 mm, the height of the L-shaped cylindrical reflector is 460 mm, the outer diameter is 326 mm, the thickness is 3 mm, the outer diameter of the bottom flange is 518 mm, the thickness is 4 mm, and the outer diameter of the outer frame is 518 mm and the thickness is 5 mm. It is characterized in that: The cylindrical fixed cylinder is fixed between the L-shaped cylindrical reflector and the outer frame, and the microstrip antenna printed circuit board is bent into a circular shape around the cylindrical fixed cylinder; threaded holes are arranged on the outer wall of the cylindrical fixed cylinder according to the positions of the through holes on the microstrip antenna printed circuit board; the top of the outer frame is used to fix the reflector, the outer diameter of the reflector is 700 mm, the inner diameter is 420 mm, the thickness is 2 mm, and the reflector and the L-shaped cylindrical reflector are perpendicular to each other.

[0005] According to a structural device for a radar decoy antenna as described above, it is characterized in that: The microstrip antenna printed circuit board is made with an F4BM220 type polytetrafluoroethylene glass cloth copper clad laminate as the substrate, with a dielectric constant of 2.2, a length of 1329 mm, a height of 218 mm, and a thickness of 0.8 mm.

[0006] According to a structural device for a radar decoy antenna as described above, it is characterized in that: It further includes an antenna cover, and antenna covers are provided both above and below the reflector.

[0007] According to a structural device for a radar decoy antenna as described above, it is characterized in that: The outer diameter of the upper antenna cover of the reflector is 530 mm, the thickness is 1 mm, and the height is 373 mm.

[0008] A structural device applied to a radar decoy antenna as described above is characterized in that: the outer diameter of the upper radome of the reflector is 530 mm, the thickness is 1 mm, and the height is 99 mm.

[0009] A structural device applied to a radar decoy antenna as described above is characterized in that: the loss of the radome ≤ 0.1 dB, and the reflection influence ≤ 0.1.

[0010] A structural device applied to a radar decoy antenna as described above is characterized in that: the radome is a fiberglass radome.

[0011] A method for installing a structural device applied to a radar decoy antenna is characterized in that: it includes the following steps

[0012] Step 1: Install the microstrip antenna printed board on the cylindrical fixing cylinder. When installing, start from the middle of the microstrip antenna printed board and install it towards both sides. The microstrip antenna printed board is attached to the cylindrical fixing cylinder;

[0013] Step 2: Fix the cylindrical fixing cylinder on the L-shaped cylindrical reflection cylinder. Install the outer frame on the L-shaped cylindrical reflection cylinder. Install the N-type connector 5 at the flange of the L-shaped cylindrical reflection cylinder and weld it;

[0014] Step 3: Install the lower radome. Align the through holes reserved on the radome with the through holes reserved on the L-shaped cylindrical reflection cylinder and fix them;

[0015] Step 4: Install the reflector on the outer frame;

[0016] Step 5: Install the upper radome. Align the through holes reserved on the upper radome, the lower radome and the reflector, and fix the radome and the reflector;

[0017] Step 6: Apply glue to the parts that need to be further sealed.

[0018] The beneficial effects of the present invention are: the cylindrical integrated omnidirectional conformal microstrip antenna structure design has the advantages of few parts, convenient processing, simple assembly, low manufacturing and maintenance costs, high reliability, meeting the large coverage range of the elevation and azimuth airspace, small insertion loss, and the in-band standing wave can reach below 1.2.

[0019] The present invention only needs to machine four parts. During processing, only need to purchase aluminum tubes of corresponding sizes for turning to meet the requirements, with low material and processing costs. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the omnidirectional conformal antenna of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the integrated microstrip antenna of the antenna of the present invention.

[0022] Figure 3 This is a top view of the antenna of the present invention.

[0023] Figure 4 This is a side view of the antenna of the present invention.

[0024] Figure 5 This is a three-dimensional schematic diagram of the omnidirectional conformal antenna of the present invention.

[0025] Explanation of reference numerals in the drawings: cylindrical fixing cylinder 1, microstrip antenna printed circuit board 2, reflector 3, L-shaped cylindrical reflector 4, N-type connector 5, radome 6, outer frame 7. Specific embodiments

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0027] As Figures 1 to 5 shown, the structural device of the present invention applied to a radar decoy antenna includes a cylindrical fixing cylinder 1, a microstrip antenna printed circuit board 2, a reflector 3, an L-shaped cylindrical reflector 4, an N-type connector 5, a radome 6, and an outer frame 7, which are all connected by screws or nuts arranged circumferentially and uniformly, thus ensuring coaxiality. Among them, the microstrip antenna printed circuit board 2 is made with a substrate of F4BM220 type polytetrafluoroethylene glass cloth copper clad laminate, with a dielectric constant of 2.2, a length of 1329 mm, a height of 218 mm, and a thickness of 0.8 mm. A number of through holes are opened on it for installation and fixation. Due to its small thickness and soft material, the microstrip antenna printed circuit board 2 can be bent around the cylindrical fixing cylinder 1 into a circular shape. The outer diameter of the cylindrical fixing cylinder 1 is 413.4 mm, the thickness is 4 mm, the inner diameter of the bottom flange is 380 mm, and there are uniformly distributed mounting threaded holes on the flange. On the outer wall of the cylindrical fixing cylinder 1, the position dimensions of the corresponding threaded holes are accurately calculated according to the positions of the through holes on the microstrip antenna, so as to cooperate with the microstrip antenna for installation, forming a cylindrical integrated microstrip antenna element and transmission line. The N-type connector 5 is fixedly connected to the back of the flange of the L-shaped cylindrical reflector 4, and the core is welded to the microstrip antenna printed circuit board 2 as the input port.

[0028] As Figures 1 to 5As shown in the figure, the outer frame 7 is assembled to the edge of the bottom flange of the L-shaped cylindrical reflector 4 with countersunk head screws. The L-shaped cylindrical reflector 4 has a height of 460 mm, an outer diameter of 326 mm, and a thickness of 3 mm. The outer diameter of the bottom flange is 518 mm and the thickness is 4 mm. The outer diameter of the outer frame 7 is 518 mm and the thickness is 5 mm. The top of the outer frame 7 is used to fix the reflector 3. The reflector 3 has an outer diameter of 700 mm, an inner diameter of 420 mm, and a thickness of 2 mm. The reflector 3 and the L-shaped cylindrical reflector 4 are perpendicular to each other, jointly forming the reflecting surface of the integrated antenna. Among them, the reflector 3 plays a role in raising the energy, and the L-shaped cylindrical reflector 4 plays a guiding function, radiating the energy upward, thereby increasing the coverage angle of the antenna's elevation plane airspace. Generally, the coverage angle range of the technical airspace is 20° to 75°, and the device of the present invention is 20° to 85°. The cylindrical fixing cylinder 1 is fixed between the L-shaped cylindrical reflector 4 and the outer frame 7. The part of the integrated microstrip antenna printed circuit board 2 above the reflector 3 is the antenna radiator, and the part of the microstrip antenna printed circuit board 2 below the reflector 3 is the feeding network. The reflector 3 can isolate the antenna radiator and the feeding network, reduce the mutual coupling between them, reduce the internal transmission loss, and improve the antenna efficiency.

[0029] To ensure the waterproof and windproof performance of the antenna, antenna covers 6 are provided both above and below the reflector 3. The upper antenna cover has an outer diameter of 530 mm, a thickness of 1 mm, and a height of 373 mm; the lower antenna cover has an outer diameter of 530 mm, a thickness of 1 mm, and a height of 99 mm. Loss of the antenna cover 6: ≤0.1 dB, reflection effect (change in voltage standing wave ratio): ≤0.1. The flange is fixed to the reflector with screws arranged circumferentially and evenly, and a sealing ring is installed inside the flange to achieve the purpose of waterproofing. The antenna cover 6 can be a fiberglass antenna cover.

[0030] The following is an explanation of the simplicity of the installation of this antenna:

[0031] Installing the antenna of the present invention only requires six steps:

[0032] Step 1: Install the microstrip antenna printed circuit board 2 on the cylindrical fixing cylinder 1. When installing, start from the middle of the printed circuit board and install towards both sides to ensure that the microstrip antenna printed circuit board 2 fits tightly with the cylindrical fixing cylinder 1;

[0033] Step 2: Install the cylindrical fixing cylinder 1 on the L-shaped cylindrical reflector 4, install the outer frame 7 on the L-shaped cylindrical reflector 4, and install the N-type connector 5 at the flange of the L-shaped cylindrical reflector 4 and weld it;

[0034] Step 3: Install the lower antenna cover 6. Align the through holes reserved on the bottom cover with the through holes reserved on the L-shaped cylindrical reflector 4 and fix them with bolts and nuts;

[0035] Step 4: Install the reflector 3 on the outer frame 7;

[0036] Step 5: Install the upper radome 6. Align the through holes reserved on the two radomes and the reflector, and fix the radome 6 and the reflector with bolts and nuts;

[0037] Step 6: Apply glue to the joints of the radome.

[0038] Before assembly, all antenna parts of the present invention are coated as required. The parts themselves already have protection capabilities, and there is no need to consider the protection of the whole during assembly; only a screwdriver, a socket, and 703 glue are required for the assembly tools.

[0039] The following is an explanation of the simplicity of the maintenance of this antenna: When maintaining the antenna of the present invention, only the upper radome needs to be disassembled, check whether condensate water is formed inside the radome, and check whether the antenna printed circuit board is damaged. The antenna of the present invention has few parts, is convenient for processing, has simple assembly, low manufacturing and maintenance costs, high reliability, reduces the insertion loss while meeting the coverage requirements of the elevation and azimuth airspace, and can ensure that the in-band standing wave is below 1.2.

Claims

1. A structural device applied to a radar decoy antenna, comprising a cylindrical fixed cylinder, a microstrip antenna printed circuit board, a reflector, an L-shaped cylindrical reflector cylinder, and an outer frame. The outer frame is installed at the edge of the bottom flange of the L-shaped cylindrical reflector cylinder. The outer diameter of the cylindrical fixed cylinder is 413.4 mm, the thickness is 4 mm, the inner diameter of the bottom flange is 380 mm, the height of the L-shaped cylindrical reflector cylinder is 460 mm, the outer diameter is 326 mm, the thickness is 3 mm, the outer diameter of the bottom flange is 518 mm, the thickness is 4 mm, and the outer diameter of the outer frame is 518 mm, the thickness is 5 mm. It is characterized in that: The cylindrical fixing cylinder is fixed between the L-shaped cylindrical reflector and the outer frame, and the microstrip antenna printed board is bent into a circular shape around the cylindrical fixing cylinder; threaded holes are arranged on the outer wall of the cylindrical fixing cylinder according to the positions of the through holes on the microstrip antenna printed board; the top of the outer frame is used to fix the reflector, the outer diameter of the reflector is 700 mm, the inner diameter is 420 mm, and the thickness is 2 mm. The reflector and the L-shaped cylindrical reflector are perpendicular to each other; the part of the microstrip antenna printed board above the reflector is the antenna radiator, and the part of the microstrip antenna printed board below the reflector is the feeding network; the outer diameter of the upper radome of the reflector is 530 mm, the thickness is 1 mm, and the height is 373 mm. The outer diameter of the lower radome of the reflector is 530 mm, the thickness is 1 mm, and the height is 99 mm. The airspace coverage angle range of the radar decoy antenna is 20° to 85°.

2. The structural device applied to a radar decoy antenna according to claim 1, characterized in that: The microstrip antenna printed board is made with an F4BM220 type polytetrafluoroethylene glass cloth copper clad laminate as the substrate, with a dielectric constant of 2.2, a length of 1329 mm, a height of 218 mm, and a thickness of 0.8 mm.

3. The structural device applied to a radar decoy antenna according to claim 1 or 2, characterized in that: It also includes radomes, and radomes are provided both above and below the reflector.

4. The structural device applied to a radar decoy antenna according to claim 1 or 2, characterized in that: The loss of the radome ≤ 0.1 dB, and the reflection effect ≤ 0.

1.

5. The structural device applied to a radar decoy antenna according to claim 1, characterized in that: The radome is a fiberglass radome.

6. A method for installing a structural device applied to a radar decoy antenna, using the structural device applied to a radar decoy antenna of claim 1, characterized in that: It includes the following steps Step 1: Install the microstrip antenna printed board on the cylindrical fixing cylinder. When installing, start from the middle of the microstrip antenna printed board and install towards both sides. The microstrip antenna printed board fits on the cylindrical fixing cylinder. Step 2: Fix the cylindrical fixing cylinder on the L-shaped cylindrical reflector, install the outer frame on the L-shaped cylindrical reflector, install the N-type connector (5) at the flange of the L-shaped cylindrical reflector, and weld it. Step 3: Install the lower radome, align the reserved through holes on the radome with the reserved through holes on the L-shaped cylindrical reflector, and fix them. Step 4: Install the reflector on the outer frame. Step 5: Install the upper radome, align the reserved through holes on the upper radome, the lower radome, and the reflector, and fix the radome and the reflector.

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