Structural device applied to C-band radar integrated animated shadow antenna and installation method

Abstract

The invention relates to the technical field of antenna structures, in particular to a structure device of a C-band radar integrated hidden shadow antenna and an installation method. Four antenna oscillators are installed on the outer sides of a left reflecting plate, a right reflecting plate and a rear reflecting plate through connecting pieces respectively, a one-to-four strip line power division network is fixed to the inner sides of the left reflecting plate, the right reflecting plate and the rear reflecting plate, the one-to-four strip line power division network and the antenna oscillators respectively adopt a back feed mode and a side feed mode, and an input port of the one-to-four strip line power division network is located on the outer side of a reflecting face. The shell, the cover plate and the one-to-three microstrip power divider microstrip plate form a one-to-three microstrip power divider. The overall structure is simplified, and the device has the advantages of being high in reliability, small in number of parts, light in weight, convenient to install, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna structures, and in particular to a structural device and an installation method of a C-band radar integrated stealth antenna. Background Art

[0002] Radar-stealing antennas are omnidirectional antennas, which are generally realized by connecting array antennas and feeding networks. They have many structural parts, and are complicated to install and debug. Too many cable connections make it difficult to ensure antenna consistency, increase system complexity, reduce reliability, and increase insertion loss, resulting in high manufacturing and maintenance costs. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a structural device and installation method for an integrated stealth antenna for C-band radar. The present invention simplifies the overall structure and has the characteristics of high reliability, few parts, light weight, easy installation and low cost.

[0004] The technical solution of the present invention is: a structural device for an integrated invisible antenna for C-band radar, comprising a left reflector, a right reflector, a rear reflector, a side plate, an upper frame, a lower frame, a 1-to-4 stripline power dividing network, a 1-to-3 microstrip power divider microstrip board, an antenna vibrator, a connector, a shell, a cover, a radome, an insulator, and a metal pin; wherein the left reflector and the right reflector are both 191mm×65mm×3mm in size, the rear reflector is 191mm×120mm×3mm in size, the side plate is 191mm×20mm×3mm in size, and the upper The frame and the lower frame have the same size, both of which are symmetrical pentagonal structures with side lengths of 117mm, 65mm, 65mm, 21mm, and 21mm, respectively, and a thickness of 12mm. The shell is a regular hexagonal structure with a side length of 31.3mm, the bottom is a square with a side length of 170mm and a thickness of 3mm, and the cover plate is a regular hexagon with a side length of 31.3mm; it is characterized in that the left reflector, the right reflector, the rear reflector, and the two side plates form a symmetrical pentagon with a certain angle, and the internal angles are: 90°, 115°, 130°, 115°, 90° The cross-sectional shape enables the directional patterns of the 12 antenna elements to cover the side lobes of the main radar antenna within the range of 0° to 360° in the azimuth plane; the antenna elements and the 1-to-4 stripline power division network are fixed on the left reflector, the right reflector, and the rear reflector, that is, the 4 antenna elements are fixed on the outer side of each surface by a connector, and the 1-to-4 stripline power division network is fixed on the inner side of the reflector with screws; the 1-to-4 stripline power division network and the antenna elements are connected in the form of back feeding and side feeding, that is, the two ends of the metal pins fixed by the cylindrical insulator are respectively connected to the antenna element and the 1-to-4 stripline power division network The network is welded, and the insulator is installed in the through hole of the reflector; a 1-to-3 microstrip power divider microstrip board is installed in the shell, and a 1-to-3 microstrip power divider is formed after the cover plate is installed. The input port of the 1-to-3 microstrip power divider adopts the bottom backfeed form, and its input port is at the bottom of the shell. The connector is exposed to the outside of the entire invisible antenna, so a waterproof connector is used; the bottom surface of the shell is a 170mm×170mm square, which is the reflection working surface of the entire invisible antenna and also the fixing surface of the antenna cover; the 1-to-3 microstrip power divider is connected to the 1-to-4 stripline power division network on the inner side of the reflector in the form of a cable assembly.

[0005] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that the dielectric substrate model of the antenna vibrator is RogersRO4350B hydrocarbon ceramic copper clad board, with a dielectric constant of 3.48, a length of 27mm, a height of 19mm, and a thickness of 0.762mm.

[0006] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that: the size of the 1-to-4 stripline power division network is 165mm×42mm, and it is formed by hot compression of three layers of copper foil with a thickness of 0.018mm, two layers of RogersRO4350B dielectric substrate with a thickness of 1.524mm, and a semi-cured sheet with a model of RO4450F and a thickness of 4mile (0.1016mm).

[0007] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that: the substrate model of the 1-to-3 microstrip board is F4B-2, the dielectric constant is 2.55, the size is a regular hexagon with a side length of 26.56 mm, and there is a small hole in the middle for bottom feeding.

[0008] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that: the left reflector, the right reflector, the rear reflector, and the side plates are fixed to the upper and lower frames to form an omnidirectional antenna reflector with a certain cross-section, wherein four antenna elements are fixed on the outside of the left reflector, the right reflector, and the rear reflector, and a 1-to-4 stripline power division network is fixed on the inside, and the 1-to-4 stripline power division network and the antenna elements are respectively back-fed and side-fed, thereby reducing the number of cables and improving the reliability of the antenna.

[0009] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that: the reflector, the right reflector, the rear reflector, and the side panels form a left-right symmetrical pentagon with a certain angle, the internal angle between the rear reflector and the two side panels is 90°, the internal angle between the right reflector, the rear reflector and the side panels is 115°, and the internal angle between the right reflector and the rear reflector is 130°. The cross-sectional shape enables the 12 antenna element radiation patterns to cover the side lobes of the main radar antenna within the range of 0° to 360° in the azimuth plane.

[0010] According to the structural device applied to the C-band radar integrated stealth antenna as described above, the characteristics are as follows: the 1-to-3 microstrip power divider is an equal amplitude and equal phase power divider, the input port is at the bottom of the shell, and it is a backfeed form. The output ports are evenly distributed on the regular hexagonal shell, and the three output ports are respectively connected to the input ports of the 1-to-4 stripline power divider network.

[0011] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that the input end of the 1-to-4 stripline power dividing network is in the form of backfeed, and the port is located on the outside of the left reflector, the right reflector, and the rear reflector, so as to be conveniently connected to the 1-to-3 microstrip power divider with a cable.

[0012] According to the structural device applied to the C-band radar integrated stealth antenna as described above, it is characterized in that the bottom surface of the shell is a square of 170mm×170mm, which is the reflection surface of the stealth antenna and also the fixing surface of the antenna cover.

[0013] According to the structural device as described above, which is applied to the C-band radar integrated stealth antenna, it is characterized in that the inner diameter of the antenna cover is 140mm, the height is 215mm, the thickness is 0.5mm, the loss is ≤0.1dB, and the reflection effect (voltage standing wave ratio change) is ≤0.1.

[0014] The present invention also discloses a method for installing a structure device for an integrated stealth antenna for a C-band radar, which is characterized by comprising the following steps:

[0015] Step 1, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, and the insulator 14 on the left reflector 1 to form component I;

[0016] Step 2, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, and the insulator 14 on the right reflector 2 to form component II;

[0017] Step 3, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, the insulator 14 on the rear reflector 9 to form component III;

[0018] Step 4, symmetrically install the two side panels 10 on the two upper frames 11 and the lower frame 15, the upper frame 11 and the lower frame 15 are located at both ends of the side panels 10, to form component IV;

[0019] Step 5, install the 1-to-3 microstrip board 12 in the housing 6, install the connectors at the input and output ports, and finally install the cover plate 5 to form a 1-to-3 microstrip power divider;

[0020] Step 6. Install component IV on the cover of the 1-to-3 microstrip power divider;

[0021] Step 7, install component I, component II, and component III at the corresponding positions of component IV respectively, and connect them to the output port of the 1-to-3 microstrip power divider with cables;

[0022] Step 8: Install the radome 7 and glue it on the edge of the radome flange with 703 glue.

[0023] The beneficial effects of the present invention are as follows: the integrated stealth antenna structure has a small number of parts, convenient processing, simple installation, light weight, easy mass production, low manufacturing and maintenance costs, high reliability, azimuth coverage of 0° to 360°, and elevation coverage of -15° to +15°. The entire stealth antenna reduces cable connections, has low insertion loss, good consistency, high gain, and a small voltage standing wave ratio within the frequency band, which fully meets the sidelobe coverage requirements of the main radar antenna.

[0024] The integrated invisible antenna of the present invention integrates the antenna vibrator and the 1-to-4 stripline power division network, which greatly reduces the number of parts, has low parts processing cost, simple installation form, light weight, easy debugging and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the integrated stealth antenna of the present invention (excluding the antenna cover).

[0026] Figure 2 for Figure 1 Cross-section in the direction of arrows.

[0027] Figure 3 This is a top view of the integrated stealth antenna of the present invention (excluding the antenna cover).

[0028] Figure 4 The invention discloses a microstrip board for a 1-to-3 microstrip power divider.

[0029] Figure 5 The 1-to-4 stripline power splitter network of the present invention

[0030] Figure 6 This is the antenna element of the present invention.

[0031] Explanation of the reference numerals: left reflector 1, right reflector 2, connector 3, antenna element 4, cover plate 5, shell 6, antenna cover 7, 1-to-4 stripline power dividing network 8, rear reflector 9, side plate 10, upper frame 11, 1-to-3 microstrip power divider microstrip board 12, metal pin 13, insulator 14, lower frame 15. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0033] like Figures 1 to 3As shown, the structural device of the integrated invisible antenna for C-band radar of the present invention comprises a left reflector 1, a right reflector 2, a connector 3, an antenna element 4, a cover plate 5, a shell 6, a radome 7, a 1-to-4 stripline power splitter network 8, a rear reflector 9, a side plate 10, an upper frame 11, a lower frame 15, and a 1-to-3 microstrip power splitter microstrip plate 12. The left reflector 1, the right reflector 2, the rear reflector 9, and the side plate 10 are all fixed on the upper frame 11 and the lower frame 15 to form a left-right symmetrical reflector of the invisible antenna. Four antenna elements 4 are respectively installed on the outer sides of the left reflector 1, the right reflector 2, and the rear reflector 9 through the connector 3, and the inner sides are all fixed with screws. The 1-to-4 stripline power splitter network 8 and the antenna element 4 are respectively back-fed and side-fed. The input port of the 1-to-4 stripline power splitter network 8 is located outside the reflecting surface and is back-fed.

[0034] The shell 6, the cover plate 5 and the 1-to-3 microstrip power divider microstrip board 12 constitute a 1-to-3 microstrip power divider. The shell 6 is a regular hexagon with a side length of 31.3 mm for installing the 1-to-3 microstrip power divider microstrip board 12. The bottom of the shell 6 is a square of 170 mm × 170 mm, which serves as both a reflector for the entire invisible antenna and a mounting surface for the antenna cover 7.

[0035] The input port of the 1-to-3 microstrip power divider is set on the bottom of the shell 6, and the back-feed form is adopted. The input port connector is exposed outside the antenna cover 7, and a waterproof connector is adopted. The lower frame 15 is installed on the cover plate 5, so that the antenna forms a whole. The output port of the 1-to-3 microstrip power divider and the input port of the 1-to-4 stripline power divider network are connected by cables. In order to ensure the waterproof and windproof performance of the antenna, the antenna cover 7 is installed on the shell 6. The inner cavity diameter of the antenna cover 7 is 140mm, the height is 215mm, the thickness is 0.5mm, the loss is ≤0.1dB, the reflection effect (voltage standing wave ratio change) is ≤0.1, and the flange is fixed with screws evenly distributed around the circumference. A sealing ring is installed inside the flange. After installation, glue is applied to the joint to ensure that there is no water leakage. The antenna cover 7 is a fiberglass antenna cover.

[0036] The left reflector 1, the right reflector 2, the rear reflector 9, and the side panels 10 of the present invention form a left-right symmetrical pentagon with a certain angle, the inner angle between the rear reflector 9 and the two side panels 10 is 90°, the inner angle between the right reflector 2, the rear reflector 9 and the side panels 10 is 115°, and the inner angle between the right reflector 2 and the rear reflector 9 is 130°. This cross-sectional shape enables the 12 antenna element radiation patterns to cover the side lobes of the main radar antenna within the range of 0° to 360° in the azimuth plane.

[0037] like Figure 4 As shown, the substrate model of the 1-to-3 microstrip power divider microstrip board 12 is F4B-2, a polytetrafluoroethylene copper-clad board with a dielectric constant of 2.55, and the size is a regular hexagon with a side length of 26.56 mm. A small hole is opened in the middle for bottom feeding.

[0038] like Figure 5 As shown, the 1-to-4 stripline power splitter network 8 has a size of 165 mm × 42 mm and is formed by hot compression of three layers of 0.018 mm thick copper foil, two layers of Rogers RO4350B dielectric substrates with a thickness of 1.524 mm, and a semi-cured sheet with a thickness of 4 mile (0.1016 mm) and a model RO4450F.

[0039] like Figure 6 As shown, the dielectric substrate of the antenna element 4 is a RogersRO4350B polytetrafluoroethylene glass cloth hydrocarbon ceramic copper-clad board with a dielectric constant of 3.48, a length of 27 mm, a height of 19 mm, and a thickness of 0.762 mm.

[0040] The following is an explanation of the antenna's simple installation:

[0041] Step 1, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, and the insulator 14 on the left reflector 1 to form component I;

[0042] Step 2, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, and the insulator 14 on the right reflector 2 to form component II;

[0043] Step 3, install the 1-to-4 stripline power dividing network 8, the antenna element 4, the connector 3, the metal pin 13, the insulator 14 on the rear reflector 9 to form component III;

[0044] Step 4, symmetrically install the two side panels 10 on the two upper frames 11 and the lower frame 15, the upper frame 11 and the lower frame 15 are located at both ends of the side panels 10, to form component IV;

[0045] Step 5, install the 1-to-3 microstrip board 12 in the housing 6, install the connectors at the input and output ports, and finally install the cover plate 5 to form a 1-to-3 microstrip power divider;

[0046] Step 6. Install component IV on the cover of the 1-to-3 microstrip power divider;

[0047] Step 7, install component I, component II, and component III at the corresponding positions of component IV respectively, and connect them to the output port of the 1-to-3 microstrip power divider with cables;

[0048] Step 8: Install the radome 7 and glue it on the edge of the radome flange with 703 glue.

[0049] Steps 1 to 3 of the present invention are standardized processes. Step 4 builds up the reflector of the antenna through the upper and lower frames and the side panels, completing the assembly of the main structure. The process is very simple. The entire installation process of the present invention does not require special tooling, only a screwdriver and 703 glue, which is convenient for mass production and processing.

[0050] The following is an explanation of the simplicity of maintenance of the antenna: When maintaining the antenna of the present invention, it is only necessary to disassemble the antenna cover, check whether condensed water is formed in the antenna cover, and check whether the antenna printed circuit board and cable are damaged. The present invention has a small number of parts, light overall weight, convenient processing, simple assembly, low manufacturing and maintenance costs, high reliability, and is easy to mass produce. The azimuth plane covers 0° to 360°, and the elevation plane covers -15° to +15°. The entire stealth antenna has high gain, low insertion loss, and a small voltage standing wave ratio in the frequency band, which fully meets the sidelobe coverage requirements of the main radar antenna.

Claims

1. A structural device for an integrated shadowless antenna for a C-band radar, comprising a left reflector, a right reflector, a connector, an antenna vibrator, a cover, a housing, a radome, a 1-to-4 stripline power splitter network, a rear reflector, a side plate, an upper frame, a lower frame, and a 1-to-3 microstrip power splitter microstrip plate, wherein the left reflector, the right reflector, the rear reflector, and the side plates are all fixed on the upper frame and the lower frame, and characterized in that: Four antenna oscillators are installed on the outside of the left reflector, the right reflector and the rear reflector through connectors, and a 1-to-4 stripline power division network is fixed on the inside. The 1-to-4 stripline power division network and the antenna oscillator adopt back feeding and side feeding respectively. The input port of the 1-to-4 stripline power division network is located on the outside of the reflecting surface. The shell, the cover plate and the 1-to-3 microstrip power divider microstrip plate constitute a 1-to-3 microstrip power divider. The lower frame is installed on the cover plate, and the antenna cover is installed on the shell. The left reflector, the right reflector, the rear reflector and the side plate form a left-right symmetrical pentagon. The inner angle between the rear reflector and the two side plates is 90°, the inner angle between the right reflector, the rear reflector and the side plate is 115°, and the inner angle between the right reflector and the rear reflector is 130°.

2. The structural device of the integrated stealth antenna for C-band radar according to claim 1 is characterized in that: The inside of the shell is a regular hexagon with a side length of 31.3 mm. The regular hexagon is installed with a 1-to-3 microstrip power divider microstrip board, and the bottom of the shell is a square of 170 mm×170 mm.

3. The structural device of the integrated stealth antenna for C-band radar according to claim 1 is characterized in that: The inner diameter of the radome is 140mm, the height is 215mm, the thickness is 0.5mm, and the radome is a fiberglass radome.

4. The structural device of the integrated shadowless antenna for C-band radar according to claim 1, characterized in that: The substrate model of the 1-to-3 microstrip power divider microstrip board is F4B-2, a polytetrafluoroethylene copper-clad board with a dielectric constant of 2.55, and the size is a regular hexagon with a side length of 26.56 mm.

5. The structural device of the integrated shadowless antenna for C-band radar according to claim 1 is characterized in that: The size of the 1-to-4 stripline power splitter network is 165mm×42mm.

6. The structural device of the integrated shadowless antenna for C-band radar according to claim 1 is characterized in that: The dielectric substrate model of the antenna vibrator is RogersRO4350B polytetrafluoroethylene glass cloth hydrocarbon ceramic copper-clad board with a dielectric constant of 3.48, a length of 27mm, a height of 19mm, and a thickness of 0.762mm.

7. A method for installing an integrated stealth antenna for C-band radar, characterized in that: The following steps are involved: Step 1, install the 1-to-4 stripline power dividing network, antenna vibrator, connector, metal pin, insulator on the left reflector 1 to form component I; Step 2, install the 1-to-4 stripline power dividing network, antenna vibrator, connector, metal pin, insulator on the right reflector 2 to form component II; Step 3, install the 1-to-4 stripline power dividing network, antenna element, connector, metal pin, insulator on the rear reflector 9 to form component III; Step 4: Install the two side panels symmetrically on the two upper frames and the lower frame, with the upper frame and the lower frame located at both ends of the side panels to form component IV; Step 5, install the 1-to-3 microstrip board 12 in the housing, install the connectors at the input and output ports, and finally install the cover plate to form a 1-to-3 microstrip power divider; Step 6. Install component IV on the cover of the 1-to-3 microstrip power divider; Step 7, install component I, component II, and component III at the corresponding positions of component IV respectively, and connect them to the output port of the 1-to-3 microstrip power divider with cables; Step 8. Install the radome and glue it on the edge of the radome flange with 703 glue.

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