CN113394561B - Ultra-wideband antenna cover for multiband synthetic aperture radar antenna and test method - Google Patents
Ultra-wideband antenna cover for multiband synthetic aperture radar antenna and test method Download PDFInfo
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- CN113394561B CN113394561B CN202110648182.3A CN202110648182A CN113394561B CN 113394561 B CN113394561 B CN 113394561B CN 202110648182 A CN202110648182 A CN 202110648182A CN 113394561 B CN113394561 B CN 113394561B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses an ultra-wideband antenna housing for a multiband synthetic aperture radar antenna and a test method, wherein the ultra-wideband antenna housing comprises a low-frequency band wave-transparent area corresponding to a low-frequency band antenna and at least one high-frequency band wave-transparent area corresponding to a high-frequency band antenna; the low-frequency band wave-transmitting area is provided with openings which penetrate through the thickness of the low-frequency band wave-transmitting area and correspond to the high-frequency band wave-transmitting area one to one; the high-frequency band wave-transparent area is of a patch type structure and is embedded in the corresponding opening of the low-frequency band wave-transparent area; the low-frequency band wave-transparent region and the high-frequency band wave-transparent region are both made of non-magnetic materials. The ultra-wideband radome can meet the requirement of high-efficiency wave-transmitting of wide-frequency and large-angle incidence of a plurality of antennas from a P waveband to a Ka waveband.
Description
Technical Field
The invention relates to the technical field of radar antennas, in particular to an ultra-wideband antenna housing for a multiband synthetic aperture radar antenna and a testing method.
Background
The ultra-wideband antenna housing is an important component of a radar system, and multiple-purpose antennas are generally distributed in the housing, and the frequency bands are different, so that the ultra-wideband antenna housing covers a wider frequency range. The antenna housing has the function of protecting the radar antenna, the structure and the wave-transmitting performance of the antenna housing directly influence whether the antenna can normally work, and certain technical indexes need to be met. Because the single-layer antenna housing structure can not meet the strength requirement, the existing antenna housing generally adopts a multi-layer wall structure containing an interlayer, and the dielectric constant of each layer of material is selected and arranged according to a certain frequency band, so that the combined antenna housing has good wave-transmitting performance. For a multiband synthetic aperture radar antenna system with different working frequency bands, a single multilayer wall cannot meet the requirement of efficient wave transmission of an ultra-wide frequency band, and especially the transmission efficiency of a high-frequency antenna is greatly influenced by an antenna housing structure, an incident angle and the like. Therefore, how to improve the ultra-wideband transmittance of the antenna cover to the multiband synthetic aperture radar antenna is an important difficulty.
A paper published by Beijing aviation materials institute, "ultra wide band antenna cover covering X wave band to Ka wave band", develops a wide band antenna housing, and test results show that the antenna housing has stable electrical property in a wide frequency range and meets the requirement of overall performance indexes. However, the radome has the disadvantage that the whole radome wall adopts a sandwich structure consisting of the same skin and core materials, namely a combination of dielectric constant materials, and the radome cannot meet the high transmittance of the multiband antenna to the maximum extent by the method, and particularly cannot obtain a large value of the wave transmittance for large-angle irradiation of the high-frequency antenna.
Disclosure of Invention
In view of this, the present invention provides an ultra-wideband antenna cover for a multiband synthetic aperture radar antenna and a testing method thereof, where the ultra-wideband antenna cover can meet the requirements of efficient wave-passing of wide-frequency and wide-angle incidence of multiple antennas from a P-band to a Ka-band.
The invention adopts the following specific technical scheme:
the invention provides an ultra-wideband antenna housing for a multiband synthetic aperture radar antenna, which comprises a low-frequency band wave-transmitting area corresponding to a low-frequency band antenna and at least one high-frequency band wave-transmitting area corresponding to a high-frequency band antenna;
the low-frequency band wave-transmitting area is provided with openings which penetrate through the thickness of the low-frequency band wave-transmitting area and correspond to the high-frequency band wave-transmitting area one by one;
the high-frequency band wave-transparent area is of a patch type structure and is embedded in a corresponding opening of the low-frequency band wave-transparent area;
the low-frequency band wave-transmitting area and the high-frequency band wave-transmitting area are both made of non-magnetic materials.
Furthermore, the low-frequency-band wave-transparent region comprises a top layer, the honeycomb core layer and a bottom layer which are sequentially stacked from top to bottom;
the top layer and the bottom layer are both glass fibers.
Further, the honeycomb core layer is a paper honeycomb structure.
Further, the dielectric constant of the top layer and the dielectric constant of the bottom layer are both greater than the dielectric constant of the honeycomb core layer;
the thickness of the top layer and the thickness of the bottom layer are both smaller than the thickness of the honeycomb core layer.
Further, the top layer and the bottom layer have a Dielectric constant of 2.98, a Dielectric loss tangent (Dielectric dispersion Factor) of 0.005, and a thickness of 0.5mm;
the honeycomb core layer has an equivalent dielectric constant of 1.068, a dielectric loss tangent of 0.004, and a thickness of 6mm.
Further, the high-frequency band wave-transparent region is a laminated structure formed by a plurality of glass fiber layers.
Further, the high-band wave-transmitting region has a dielectric constant of 2.98, a dielectric loss tangent of 0.005 and a thickness of 1.5mm.
Furthermore, the high-frequency band wave-transparent area comprises a flat patch and a fillet patch.
Furthermore, the high-frequency band wave-transmitting area is fixedly arranged on the low-frequency band wave-transmitting area through metal nails.
In addition, the invention also provides a testing method of the ultra-wideband antenna housing, which comprises the following steps:
preparing an ultra-wideband antenna housing;
exciting the ultra-wideband antenna cover by adopting a multi-dimensional antenna;
carrying out far field test on the transmission coefficient of the ultra-wideband antenna housing at different pitch angles and polarization of a plurality of frequency points in corresponding frequency bands;
and (3) simulating a high-frequency-band wave-transmitting area in the ultra-wideband antenna housing by adopting full-wave simulation software, and evaluating the influence of the high-frequency-band wave-transmitting area and the metal nails on wave transmission of different frequency bands.
Has the beneficial effects that:
1. the ultra-wideband antenna housing adopts a distributed patch Ding Jia installation design on the basis of a multilayer structure for a high-frequency antenna, the patch area is different from the antenna housing area corresponding to other antennas, and the ultra-wideband antenna housing is formed by combining special material layers with different dielectric constants on the basis of considering curvature and incidence angle, so that the high-frequency antenna has good transmission efficiency.
2. The ultra-wideband antenna housing provided by the invention meets the electrical performance requirement of the antenna housing for a high-frequency antenna to the maximum extent, and has better wave-transmitting rate compared with the whole antenna housing which adopts a consistent multilayer dielectric constant material.
3. The ultra-wideband radome is provided with the low-frequency-band wave-transmitting area and the high-frequency-band wave-transmitting area, the high-frequency-band wave-transmitting area is arranged in an opening of the low-frequency-band wave-transmitting area in a patch type structure, the low-frequency-band wave-transmitting area corresponds to the position of a low-frequency-band antenna, and the high-frequency-band wave-transmitting area corresponds to the position of a high-frequency-band antenna, so that the ultra-wideband radome is not only suitable for the low-frequency-band antenna, but also suitable for the high-frequency-band antenna, can meet the requirement of high-efficiency wave transmission of wide-frequency-angle incidence of a plurality of antennas from a P wave band to a Ka wave band, has higher wave-transmitting rate for each frequency-band antenna, and can enlarge the application range of the ultra-wideband radome.
4. Because the high-band wave-transparent area is inlayed in the low-band wave-transparent area, can arrange the position and the shape of high-band wave-transparent area in the low-band wave-transparent area according to the high-band antenna is nimble, simplify the structural design of ultra wide band antenna house, strengthened the application range and the flexibility of ultra wide band antenna house.
5. The low-frequency-band wave-transmitting area is provided with the honeycomb core layer in a clamping mode between the glass fibers, and the glass fibers have the characteristics of light weight, good insulating property, strong heat resistance, good corrosion resistance, impact resistance, high mechanical strength and strong wave-transmitting property (the wave-transmitting rate is up to more than 98%), and the honeycomb core layer has the characteristics of high bending rigidity, high strength and light weight, so that the low-frequency-band wave-transmitting area forming the ultra-wideband antenna cover main body also has the characteristics of high structural strength, strong bending resistance, light weight, corrosion resistance, good insulating property and strong wave-transmitting property, and the working stability of the ultra-wideband antenna cover can be improved.
6. Because the high-frequency band wave-transmitting area is formed by adopting the glass fiber layer, the high-frequency band wave-transmitting area has the characteristics of good insulativity, strong heat resistance, good corrosion resistance, high mechanical strength and strong wave-transmitting property, and meanwhile, the high-frequency band wave-transmitting area is smaller in thickness, so that the high-frequency wave permeability is further improved, and the wave-transmitting rate of the ultra-wideband radome is improved.
7. The low-frequency band wave-transmitting area and the high-frequency band wave-transmitting area of the ultra-wideband antenna cover are both made of glass fibers, and the glass fibers can adapt to severe environments of minus 45-110 ℃, so that the use occasion, the working reliability and the service life of the ultra-wideband antenna cover are further improved.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-wideband radome of the present invention;
FIG. 2 is a schematic diagram of a multi-band synthetic aperture radar antenna layout for an ultra-wideband radome of the present invention;
FIG. 3 is a simulation model diagram of the high-band wave-transparent region and the metal nail of the present invention;
FIG. 4 is a graph showing the transmission coefficient of the electromagnetic wave in the L band in the high-band wave-transparent region according to the present invention;
FIG. 5 is a graph showing the transmission coefficient of electromagnetic waves in the X band in the high-band wave-transparent region according to the present invention;
fig. 6 is a flowchart of a testing method of the ultra-wideband radome of the present invention.
The antenna comprises a 1-low-frequency band wave-transmitting area, a 2-high-frequency band wave-transmitting area, a 3-low-frequency band antenna, a 4-high-frequency band antenna, a 5-metal nail, a 21-straight band patch, a 22-fillet band patch, a 31-antenna I, a 32-antenna II, a 41-antenna III, a 42-antenna IV and a 43-antenna V
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example one
The embodiment of the invention provides an ultra-wideband antenna cover for a multiband synthetic aperture radar antenna, wherein the multiband synthetic aperture radar antenna can be divided into a plurality of low-frequency-band antennas 3 and high-frequency-band antennas 4 and is provided with a plurality of different frequency bands from a P wave band to a Ka wave band; as shown in fig. 1 and fig. 2, the ultra-wideband radome includes a low-band wave-transparent region 1 corresponding to a low-band antenna 3 and at least one high-band wave-transparent region 2 corresponding to a high-band antenna 4; the low-frequency band antenna 3 may include a first antenna 31 and a second antenna 32, wherein the operating frequency of the first antenna 31 and the second antenna 32 may be 0.3 GHz-10 GHz from a P-band to an X-band; the high-frequency-band antenna 4 can comprise an antenna three 41, an antenna four 42 and an antenna five 43, wherein the working frequency of the antenna three 41 is 19 GHz-21 GHz and 30GHz from a K wave band to a Ka wave band; the working frequency of the antenna IV 4242 is 16.3 GHz-17.1 GHz of the Ku wave band; the working frequency of the antenna five 4343 is 32 GHz-38 GHz of a Ka wave band; in the embodiment of the present invention, two high-frequency band wave-transparent regions 2, two low-frequency band antennas 3, and three high-frequency band antennas 4 are provided as an example for description;
the low-frequency band wave-transparent area 1 is provided with openings which penetrate through the thickness of the low-frequency band wave-transparent area and correspond to the high-frequency band wave-transparent area 2 one by one; the low-frequency band wave-transparent area 1 forms a main body structure of the ultra-wideband antenna housing, and a through opening is formed in an area corresponding to the position of the high-frequency band antenna 4 and used for installing the high-frequency band wave-transparent area 2; the low-frequency band wave-transparent area 1 covers the position of the low-frequency band antenna 3; the high-frequency band wave-transparent area 2 covers the position of the high-frequency band antenna 4; according to an electromagnetic wave incident angle, curvature of an antenna housing, a specific working frequency range and a polarization mode of the antenna, which are determined by the position relation of the antenna relative to the antenna housing, a multi-layer structure which meets the requirement of high-efficiency wave transmission of a low-frequency band and has different dielectric constant combinations is selected as a low-frequency band wave transmission area 1 to cover a P wave band, an L wave band, an S wave band, a C wave band and an X wave band;
the high-frequency band wave-transparent area 2 is of a patch type structure and is embedded in a corresponding opening of the low-frequency band wave-transparent area 1; designing a distributed patch meeting efficient wave-transparent requirements for a high-frequency antenna with low wave-transparent efficiency as a high-frequency band wave-transparent area 2, wherein the distributed patch comprises a straight patch 21 and a fillet patch 22 with a certain curvature, covers a Ku wave band, a K wave band and a Ka wave band, and is additionally arranged in a corresponding antenna cover area; the positions of the third antenna 41 and the fourth antenna 42 correspond to the flat patch 21, and the position of the fifth antenna 43 corresponds to the fillet patch 22;
the low-frequency band wave-transmitting area 1 and the high-frequency band wave-transmitting area 2 are both made of non-magnetic materials, and the magnetic conductivity can be approximately 1.
Above-mentioned ultra wide band antenna house is provided with the low band and passes through ripples district 1 and the high band and pass through ripples district 2, and pass through ripples district 2 with the patch formula structure and install in the opening that the low band passed through ripples district 1, and the low band passes through ripples district 1 and low band antenna 3 position and corresponds, the high band passes through ripples district 2 and corresponds with high band antenna 4 position, make ultra wide band antenna house not only be applicable to low band antenna 3, and be applicable to high band antenna 4, can satisfy the high-efficient wave-transparent of the wide frequency wide-angle incident of a plurality of antennas of P wave band to Ka wave band, all have higher wave-transparent rate to each frequency channel antenna, can enlarge the application range of ultra wide band antenna house.
Meanwhile, the high-frequency band wave-transparent area 2 is embedded in the low-frequency band wave-transparent area 1, the high-frequency band wave-transparent area 2 can be flexibly arranged according to the high-frequency band antenna 4, the structural design of the ultra-wideband antenna housing is simplified, and the application range and flexibility of the ultra-wideband antenna housing are enhanced.
In a specific embodiment, the low-frequency-band wave-transparent region 1 comprises a top layer, a honeycomb core layer and a bottom layer which are sequentially stacked from top to bottom; the top layer and the bottom layer are both made of glass fiber; the honeycomb core layer is of a paper honeycomb structure; the dielectric constant of the top layer and the dielectric constant of the bottom layer are both larger than the dielectric constant of the honeycomb core layer; the thickness of the top layer and the thickness of the bottom layer are both smaller than the thickness of the honeycomb core layer. The top and bottom layers may have a dielectric constant of 2.98, a dielectric loss tangent of 0.005, and a thickness of 0.5mm; the honeycomb core layer may have an equivalent dielectric constant of 1.068, a dielectric loss tangent of 0.004, and a thickness of 6mm.
The low-frequency-band wave-transmitting area 1 is provided with the honeycomb core layer in a clamping mode between the glass fibers, and the glass fibers have the characteristics of light weight, good insulating property, strong heat resistance, good corrosion resistance, impact resistance, high mechanical strength and strong wave-transmitting property (the wave-transmitting rate is up to more than 98%), and the honeycomb core layer has the characteristics of high bending rigidity, high strength and light weight, so that the low-frequency-band wave-transmitting area 1 forming the ultra-wideband radome main body also has the characteristics of high structural strength, strong bending resistance, light weight, corrosion resistance and good insulating property, and the working stability and the service life of the ultra-wideband radome can be improved.
In addition, the dielectric constant of the glass fiber of the top layer and the bottom layer is 2.98, the dielectric loss tangent is 0.005, the equivalent dielectric constant of the honeycomb core layer is 1.068, and the dielectric loss tangent is 0.004, so that the wave-transmitting effect of the low-frequency wave-transmitting region 1 is further improved through the optimized setting of parameters.
Specifically, the high-band wave-transmitting region 2 is a laminated structure formed of a plurality of glass fiber layers, wherein, in a specific use process, the high-band wave-transmitting region 2 may be formed of 6 glass fiber layers, and the thickness of each glass fiber layer may be 0.25mm; the high band pass region 2 may have a dielectric constant of 2.98, a dielectric loss tangent of 0.005, and a thickness of 1.5mm. The high-band transparent region 2 may include a flat-segment patch 21 and a rounded-segment patch 22. As shown in the structure of fig. 3, the high-frequency band wave-transmitting region 2 is fixedly mounted on the low-frequency band wave-transmitting region 1 through metal nails 5.
The high-frequency-band wave-transmitting area 2 is formed by adopting a glass fiber layer, and the glass fiber has the characteristics of light weight, good insulation property, strong heat resistance, good corrosion resistance, high mechanical strength, impact resistance and strong wave-transmitting property (the wave-transmitting rate is up to more than 98%), so that the high-frequency-band wave-transmitting area 2 has the characteristics of good insulation property, strong heat resistance, good corrosion resistance, high mechanical strength and strong wave-transmitting property, and meanwhile, the thickness of the high-frequency-band wave-transmitting area 2 is smaller, so that the high-frequency wave transmission is further improved, and the wave-transmitting rate of the ultra-wideband radome is improved.
The glass fiber can adapt to severe environment of minus 45 ℃ to 110 ℃, so that the use occasion and the working reliability of the ultra-wideband antenna cover are further improved.
Example two
An embodiment of the present invention provides a method for testing an ultra-wideband radome in the first embodiment, where as shown in fig. 6, the method includes the following steps:
s10, preparing an ultra-wideband antenna housing;
step S20, exciting the ultra-wideband antenna housing by adopting a multi-dimensional antenna;
s30, performing far field test on the transmission coefficient of the ultra-wideband antenna housing at different pitch angles and polarization of a plurality of frequency points in corresponding frequency bands;
and S40, simulating the high-frequency-band wave-transmitting area 2 in the ultra-wideband antenna housing by adopting full-wave simulation software, and evaluating the influence of the high-frequency-band wave-transmitting area 2 and the metal nails 5 on wave transmission of different frequency bands.
The L wave band and the X wave band of the high-frequency band wave-transmitting area 2 and the peripheral metal nails 5 in the low-frequency band are simulated by full-wave simulation software, the model is shown as a structure in figure 3, wherein the high-frequency band wave-transmitting area 2 is of a rectangular structure, the length size is 1610mm, the width size is 500mm, the thickness size is 1.2mm, a circle of cylindrical metal structures with the radius of 3mm are distributed on the periphery, the metal nails 5 are replaced by the cylindrical metal structures, the distance between the cylindrical metal structures is 50mm, and meanwhile, the situation without the metal nails 5 is compared. The transmission coefficients of the electromagnetic waves of the L wave band and the X wave band obtained through simulation are shown in fig. 4 and fig. 5, the simulation results show that the transmission coefficients of the high-frequency band wave-transmitting region 2 to incident waves of the L wave band and the X wave band are respectively above 0.99 and 0.96 when no metal nail 5 is arranged, while the transmission coefficients are only slightly reduced and the difference is not obvious when the metal nail 5 is added, which shows that the high-frequency band wave-transmitting region 2 can meet the high-efficiency transmission of low-frequency electromagnetic waves, and the metal nail 5 almost has no influence on the transmission of the electromagnetic waves.
The ultra-wideband antenna housing for the multiband synthetic aperture radar antenna is subjected to far field test, five antennas are respectively excited under the original layout, the antenna housing wave-transmitting area with the corresponding layout is tested under the corresponding working state, and the working state of the antennas is as follows in the following table 1:
TABLE 1 test conditions for each antenna
The test results are:
the horizontal polarization average wave transmittance of the antenna I31 is 91.5%, and the vertical polarization average wave transmittance is 90.7%;
the horizontal polarization average wave transmission rate of the second antenna 32 is 94.1%, and the vertical polarization average wave transmission rate is 91.5%;
the horizontal polarization average wave transmittance of the antenna III 41 is 87.7 percent, and the vertical polarization average wave transmittance is 85.6 percent;
the horizontal polarization average wave transmittance of the antenna IV 42 is 95.7 percent, and the vertical polarization average wave transmittance is 93.9 percent;
the horizontal polarization average wave transmittance of the antenna five 43 is 88.3%, and the vertical polarization average wave transmittance is 87.5%;
in summary, the ultra-wideband antenna cover for the multiband synthetic aperture radar antenna in the embodiment of the present invention has an average wave transmittance of more than 85% for multiple antennas in a wideband range at different frequency points, at different incident angles and in different polarization modes, and can meet the normal operating requirements of the multiband synthetic aperture radar antenna system.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The ultra-wideband antenna cover is used for a multiband synthetic aperture radar antenna, and a synthetic aperture radar low-frequency-band antenna (3) and a synthetic aperture radar high-frequency-band antenna (4) are installed in the ultra-wideband antenna cover, and is characterized by comprising a low-frequency-band wave-transparent area (1) corresponding to the low-frequency-band antenna (3) and at least one high-frequency-band wave-transparent area (2) corresponding to the high-frequency-band antenna (4);
the low-frequency band wave-transmitting area (1) is provided with openings which penetrate through the thickness of the low-frequency band wave-transmitting area and correspond to the high-frequency band wave-transmitting area (2) one by one; the low-frequency-band wave-transparent area forms a main body structure of the ultra-wideband antenna housing;
the high-frequency band wave-transparent area (2) is of a patch type structure and is embedded in a corresponding opening of the low-frequency band wave-transparent area (1); the high-frequency band wave-transmitting area (2) is fixedly arranged in the low-frequency band wave-transmitting area (1) through a metal nail (5); arranging the position and the shape of the high-frequency band wave-transmitting area (2) in the low-frequency band wave-transmitting area (1) according to a high-frequency band antenna; the high-frequency band wave-transparent area (2) comprises a straight section patch (21) and a fillet section patch (22);
the low-frequency band wave-transmitting area (1) and the high-frequency band wave-transmitting area (2) are both made of non-magnetic materials.
2. The ultra-wideband radome of claim 1 wherein the low-frequency band wave-transparent region (1) comprises a top layer, a honeycomb core layer and a bottom layer which are sequentially stacked from top to bottom;
the top layer and the bottom layer are both glass fibers.
3. The ultra-wideband radome of claim 2, wherein the honeycomb core layer is a paper honeycomb structure.
4. The ultra-wideband radome of claim 3, wherein the dielectric constant of the top layer and the dielectric constant of the bottom layer are both greater than the dielectric constant of the honeycomb core layer;
the thickness of the top layer and the thickness of the bottom layer are both smaller than the thickness of the honeycomb core layer.
5. The ultra-wideband radome of claim 4, wherein the top layer and the bottom layer have a dielectric constant of 2.98, a dielectric loss tangent of 0.005, and a thickness of 0.5mm;
the honeycomb core layer has an equivalent dielectric constant of 1.068, a dielectric loss tangent of 0.004, and a thickness of 6mm.
6. The ultra-wideband radome of claim 1, wherein the high-band wave-transparent region (2) is a laminated structure formed of a plurality of glass fiber layers.
7. The ultra-wideband radome of claim 6, wherein the high-band wave-transparent region (2) has a dielectric constant of 2.98, a dielectric loss tangent of 0.005 and a thickness of 1.5mm.
8. A method of testing an ultra-wideband radome of claim 1, comprising:
preparing an ultra-wideband antenna housing;
exciting the ultra-wideband antenna cover by adopting a multi-dimensional antenna;
carrying out far field test on the transmission coefficient of the ultra-wideband antenna housing at different pitch angles and polarization of a plurality of frequency points in corresponding frequency bands;
full-wave simulation software is adopted to simulate a high-frequency-band wave-transmitting area (2) in the ultra-wideband antenna housing, and the influence of the high-frequency-band wave-transmitting area (2) and metal nails (5) on wave transmission of different frequency bands is evaluated.
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| CN114671007B (en) * | 2022-04-01 | 2022-11-22 | 中国科学院空天信息创新研究院 | Long-baseline small-deformation array radome truss for three-dimensional imaging radar |
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