CN216980871U - Airborne radar antenna loaded with super-surface structure - Google Patents
Airborne radar antenna loaded with super-surface structure Download PDFInfo
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- CN216980871U CN216980871U CN202220756153.9U CN202220756153U CN216980871U CN 216980871 U CN216980871 U CN 216980871U CN 202220756153 U CN202220756153 U CN 202220756153U CN 216980871 U CN216980871 U CN 216980871U
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Abstract
The utility model discloses an airborne radar antenna loaded with a super-surface structure, which comprises an upper layer, an air layer and a lower layer, wherein the upper layer is arranged in the middle right above the lower layer; the upper layer is a defected ground structure, the lower layer comprises a carrier, and a super-surface structure and a reflecting surface which are arranged in the carrier, the super-surface structure is arranged on the upper side in the carrier, the reflecting surface is arranged on the lower side in the carrier, and the horizontal section of the carrier is consistent with the reflecting surface; according to the utility model, the antenna unit is combined with the surface of the metamaterial, and a coplanar waveguide feeding method is adopted, so that the size of the antenna is reduced, the bandwidth and the gain of the antenna are effectively increased, the radiation efficiency is improved, and meanwhile, the antenna can stably work in a frequency band of 9.6 GHz-10.2 GHz, and the antenna can be used as a good choice for an airborne radar antenna.
Description
Technical Field
The utility model belongs to the technical field of military wireless communication, and relates to an airborne antenna of an X wave band, in particular to an airborne radar antenna loaded with a super-surface structure.
Background
The radar is an indispensable tracking and positioning device, and not only is an important electronic device for economic development and scientific research, but also plays a vital role in the military field, so the design of an airborne radar antenna is particularly important. Generally, an airborne radar antenna is required to have the characteristics of high gain, wide bandwidth and low side lobe, however, when the airborne radar searches for a ground moving target, strong ground clutter is generated, and due to the change of the speed of the ground clutter in different directions relative to a radar carrier, the clutter frequency spectrum is seriously widened, the side lobe level becomes high, and the detection performance of a weak and small low-speed ground target is greatly influenced.
The X frequency band has the functions of a broadcasting satellite, a fixed communication service satellite, radar detection, a meteorological satellite and the like in the aspect of space application, particularly, an airborne radar working in the X wave band generates a shorter wavelength, has high sensitivity and strong anti-interference capability, has higher efficiency for detecting micro particles, and can use a small antenna. Currently, many researches have been made to improve the bandwidth and gain of an antenna in a desired frequency band while ensuring high transmission efficiency of the antenna. For example, in a document "Open-slot dipole antenna for an airborne VHF/UHF sounding and imaging radar" published by Wanghaoyun et al, a quad-element antenna dipole array is designed, the structure is simple, high gain of 10dBi is realized by adjusting the distance between dipoles, but the impedance bandwidth of the antenna is only 300 MHz; cahya Edi Santosa et al, in published "Conformal solar array antenna for circulating polarized synthetic antenna onboard UAV", uses a Conformal array antenna for UAV radar, which, although it has a wide frequency band and a good Conformal structure, requires a large size to be designed to meet the gain requirement and cannot guarantee the radiation efficiency of the antenna; liu introduces a low-profile airborne yagi antenna in airborne miniaturized Koch yagi array antenna design, combines the radiation characteristics of yagi antenna, realizes low profile, and has the characteristics of forward radiation and small size, but the low-profile airborne yagi antenna still has the problems of low gain, narrow bandwidth and the like. The traditional method is difficult to simultaneously improve the working frequency bandwidth and the gain of the antenna.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides the airborne radar antenna loaded with the super-surface structure, which has the advantages of high gain, small loss, wide frequency band and stable radiation characteristic and can be used as an excellent choice of the airborne radar antenna.
In order to realize the purpose of the utility model, the utility model adopts the following scheme: designing an airborne radar antenna loaded with a super-surface structure, wherein the antenna comprises an upper layer, an air layer and a lower layer, and the upper layer is arranged right above the lower layer in the middle; the four corners of the lower surface of the upper layer are provided with upper mounting holes, lower mounting holes are arranged on the upper surface of the lower layer opposite to the upper mounting holes, the upper mounting holes and the lower mounting holes opposite to the upper mounting holes are connected through matched insulating pillars to realize the assembly and alignment of the upper layer and the lower layer, and an air layer is formed by generating intervals between the upper layer and the lower layer;
the upper layer comprises an upper radiation patch and an upper dielectric substrate, and the upper radiation patch is arranged on the upper surface of the upper dielectric substrate; the upper layer is of a defected structure and is obtained by corroding the upper radiation patch covering the upper surface of the upper dielectric substrate to obtain a corrosion hole and expose the upper dielectric substrate at the corresponding position;
the corrosion holes comprise two parts, wherein the first part is a director structure arranged at the rear end of the upper radiation patch, the director structure is composed of ten identical arc-shaped corrosion holes, and the ten arc-shaped corrosion holes are arranged in a row from back to front and are arranged at equal intervals; the arc corrosion holes are formed by minor arcs arranged at the rear end and front end chords corresponding to the minor arcs, and the orientation of each arc corrosion hole is the same; the second part is two approximately F-shaped corrosion holes which are arranged on the left side and the right side of the front end of the upper radiation patch and are mirror-symmetrical; the open ends of the two approximate F-shaped corrosion holes face the left side and the right side of the upper radiation patch, and the symmetrical surfaces of the two approximate F-shaped corrosion holes are coplanar with the symmetrical surface of the director structure and the symmetrical surface of the upper radiation patch in the front-back direction;
the rear end of the right side of the approximate F-shaped corrosion hole on the right side is an upper inferior arc, and the right end of the upper inferior arc is closed by the right end of the upper line segment; the upper line segment is obtained by cutting off a section of the left end of the chord corresponding to the upper minor arc, and a gap is formed between the left end of the upper line segment and the left end of the upper minor arc; the front end of the right side of the approximate F-shaped corrosion hole on the right side is a lower curve, and the lower curve is a lower minor arc with the left end cut off; the right end of the lower curve is closed by the right end of the lower line segment, and the middle part of the left side of the lower line segment, which is a chord corresponding to the lower minor arc, is cut off, namely a gap exists on the left side of the lower line segment; the upper minor arc is parallel to the lower curve, and the upper line segment is parallel to the lower line segment;
the left end of the inferior arc on the upper part is connected with the left end of the gap on the left side of the lower line segment through a first connecting line which is vertical to the upper line segment; the left end of the upper line segment is connected with the left end of the lower curve through a second connecting line, and the included angle between the second connecting line and the upper line segment is an obtuse angle; the left end of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a first extension line, and the first extension line is perpendicular to the lower line segment; the right end of the notch on the left side of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a second extension line, and the second connection line and the second extension line are positioned on the same straight line;
the lower layer comprises a carrier, and a super-surface structure and a reflecting surface which are arranged in the carrier, wherein the super-surface structure is arranged on the upper side in the carrier, the reflecting surface is arranged on the lower side in the carrier, and the horizontal section of the carrier is consistent with the reflecting surface; the super-surface structure is arranged above the reflecting surface in a spatially centered manner; the super-surface structure is formed by arranging metal patch units with the same size at equal intervals according to an n x n array, wherein n is an integer not less than 2.
Compared with the prior art, the utility model has the beneficial effects that: the antenna designed by the utility model reduces the volume of the antenna by combining the super-surface structure with the traditional antenna and adopting a coplanar waveguide feed method; the simulation mode verifies that the loss can be effectively reduced by adopting the antenna, the bandwidth and the gain of the antenna are increased, the directional radiation of the antenna is realized, the radiation efficiency of the antenna is improved, the antenna can stably work in a frequency band of 9.6 GHz-10.4 GHz, and the antenna can be used as a good choice of an airborne radar antenna.
Drawings
Fig. 1 is a schematic structural diagram of an upper radiation patch of an upper layer of an embodiment of an antenna of the present invention;
fig. 2 is a schematic top view of a lower layer of an antenna according to an embodiment of the present invention;
fig. 3 is a schematic side view of an antenna according to an embodiment of the present invention (in which the carrier of the lower layer is made of transparent material, such as polydimethylsiloxane);
fig. 4 is a graph of a simulation result of a return loss curve of the antenna in embodiment 1;
fig. 5 is a pattern diagram of the E-plane and H-plane of the antenna in embodiment 1.
Detailed Description
To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings.
The utility model provides an airborne radar antenna (antenna for short) loaded with a super-surface structure, which comprises an upper layer, an air layer and a lower layer, wherein the upper layer is arranged above the lower layer in the middle; the four corners of the lower surface of the upper layer are provided with upper mounting holes, lower mounting holes are arranged on the upper surface of the lower layer opposite to the upper mounting holes, the upper mounting holes and the lower mounting holes opposite to the upper mounting holes are connected through matched insulating pillars to realize the assembly and alignment of the upper layer and the lower layer, and an air layer is formed between the upper layer and the lower layer at intervals.
The upper layer comprises an upper radiation patch and an upper dielectric substrate, and the upper radiation patch is arranged on the upper surface of the upper dielectric substrate. The upper layer is of a defected structure and is obtained by corroding the upper radiation patch covering the upper surface of the upper dielectric substrate to obtain a corrosion hole and expose the upper dielectric substrate at the corresponding position;
the corrosion holes comprise two parts, wherein the first part is a director structure arranged at the rear end of the upper radiation patch, the director structure is composed of ten identical arc-shaped corrosion holes, and the ten arc-shaped corrosion holes are arranged in a row from back to front and are arranged at equal intervals; and each arc-shaped corrosion hole is formed by a minor arc arranged at the rear end and a front end chord corresponding to the minor arc, and the orientation of each arc-shaped corrosion hole is the same. The second part is two approximately F-shaped corrosion holes which are arranged on the left side and the right side of the front end of the upper radiation patch and are mirror-symmetrical; the open ends of the two approximate F-shaped corrosion holes face the left side and the right side of the upper radiation patch, and the symmetrical surfaces of the two approximate F-shaped corrosion holes are coplanar with the symmetrical surface of the director structure and the symmetrical surface of the upper radiation patch in the front-back direction.
The rear end of the right side of the approximate F-shaped corrosion hole on the right side is an upper inferior arc, and the right end of the upper inferior arc is closed by the right end of the upper line segment; the upper line segment is obtained by cutting off a section of the left end of the chord corresponding to the upper minor arc, and a gap is formed between the left end of the upper line segment and the left end of the upper minor arc; the front end of the right side of the approximate F-shaped corrosion hole on the right side is a lower curve, and the lower curve is a lower minor arc with the left end cut off; the right end of the lower curve is closed by the right end of the lower line segment, and the middle part of the left side of the lower line segment, which is a chord corresponding to the lower minor arc, is cut off, namely a gap exists on the left side of the lower line segment; the upper minor arc is parallel to the lower curve, and the upper line segment is parallel to the lower line segment;
the left end of the inferior arc on the upper part is connected with the left end of the gap on the left side of the lower line segment through a first connecting line which is vertical to the upper line segment; the left end of the upper line segment is connected with the left end of the lower curve segment through a second connecting line, and the included angle between the second connecting line and the upper line segment is an obtuse angle. The left end of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a first extension line, and the first extension line is perpendicular to the lower line segment; the right end of the notch on the left side of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a second extension line, and the second connection line and the second extension line are located on the same straight line.
The lower layer comprises a carrier, and a super surface structure (MS) and a reflecting surface which are arranged in the carrier, wherein the super surface structure is arranged on the upper side in the carrier, the reflecting surface is arranged on the lower side in the carrier, and the horizontal section of the carrier is consistent with the reflecting surface (namely the shape and the size are completely the same); the super-surface structure is arranged above the reflecting surface in a spatially centered manner. The super-surface structure is formed by arranging metal patch units with the same size at equal intervals according to an n x n array, wherein n is an integer not less than 2.
The antenna designed by the utility model has the feeding port as the upper radiation patch part at the lower end between the two approximately F-shaped corrosion holes on the upper layer. And a feed power supply is connected to the feed port, and the upper layer of the antenna is in a feeding mode of coplanar waveguide feed due to the corrosion hole arranged on the grounding plate. And the MS structure is radiated and excited downwards in a feeding mode of the coplanar waveguide with the ground plane to form resonance. The defected ground structure on the upper layer enables the whole antenna feed part to radiate downwards through the grounding surface, and meanwhile, the current distributed along the horizontal direction is more uniform, so that the coupling is increased, and the impedance matching is realized. Because feed network can produce radiation downwards, consequently set up super surface structure and plane of reflection at the lower floor of antenna through the carrier, the super surface of lower floor can make the current direction of upper strata more concentrated, and the lower floor of antenna has reduced main back lobe radiation size, has improved the directional radiation of antenna, has increased the operating frequency bandwidth of antenna, has improved the work efficiency and the gain of antenna.
Example 1
The utility model provides an airborne radar antenna (antenna for short, see fig. 1-3) loaded with a super-surface structure, which comprises an upper layer, an air layer and a lower layer, wherein the upper layer is arranged above the lower layer in the middle; the four corners of the lower surface of the upper layer are provided with upper mounting holes, lower mounting holes are arranged on the upper surface of the lower layer opposite to the upper mounting holes, the upper mounting holes and the lower mounting holes opposite to the upper mounting holes are connected through matched insulating pillars to realize the assembly and alignment of the upper layer and the lower layer, and an air layer is formed between the upper layer and the lower layer at intervals.
The upper layer includes an upper radiation patch 100 and an upper dielectric substrate 101, and the upper radiation patch 100 is disposed on the upper surface of the upper dielectric substrate 101. The upper layer is a defected structure and is obtained by etching the upper radiation patch 100 covering the upper surface of the upper dielectric substrate 101 to obtain an etched hole and expose the upper dielectric substrate at the corresponding position;
the corrosion holes comprise two parts, wherein the first part 11 is a director structure arranged at the rear end of the upper radiation patch, the director structure is composed of ten identical arc-shaped corrosion holes, and the ten arc-shaped corrosion holes are arranged in a row from back to front and are arranged at equal intervals; and each arc-shaped corrosion hole is formed by a minor arc arranged at the rear end and a front end chord corresponding to the minor arc, and the orientation of each arc-shaped corrosion hole is the same. The second part 12 is two approximately F-shaped corrosion holes which are arranged on the left side and the right side of the front end of the upper radiation patch and are mirror-symmetrical; the open ends of the two approximate F-shaped corrosion holes face the left side and the right side of the upper radiation patch, and the symmetrical surfaces of the two approximate F-shaped corrosion holes are coplanar with the symmetrical surface of the director structure and the symmetrical surface of the upper radiation patch in the front-back direction.
The rear end of the right side of the approximate F-shaped corrosion hole on the right side is an upper inferior arc, and the right end of the upper inferior arc is closed by the right end of the upper line segment; the upper line segment is obtained by cutting off a section of the left end of the chord corresponding to the upper minor arc, and a gap is formed between the left end of the upper line segment and the left end of the upper minor arc; the front end of the right side of the approximate F-shaped corrosion hole on the right side is a lower curve, and the lower curve is a lower minor arc with the left end cut off; the right end of the lower curve is closed by the right end of the lower line segment, and the middle part of the left side of the lower line segment, which is a chord corresponding to the lower minor arc, is cut off, namely a gap exists on the left side of the lower line segment; the upper minor arc is parallel to the lower curve, and the upper line segment is parallel to the lower line segment;
the left end of the inferior arc on the upper part is connected with the left end of the gap on the left side of the lower line segment through a first connecting line which is vertical to the upper line segment; the left end of the upper line segment is connected with the left end of the lower curve segment through a second connecting line, and the included angle between the second connecting line and the upper line segment is an obtuse angle. The left end of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a first extension line, and the first extension line is vertical to the lower line segment; the right end of the notch on the left side of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a second extension line, and the second connecting line and the second extension line are positioned on the same straight line.
The lower layer comprises a carrier 102, and a super surface structure (MS)103 and a reflecting surface 104 which are enclosed in the carrier 102, wherein the super surface structure 103 is arranged on the upper side in the carrier 102, the reflecting surface 104 is arranged on the lower side in the carrier 102, and the horizontal section of the carrier 102 is consistent with the reflecting surface 104; the super-surface structure 103 is spatially centered directly above the reflective surface 104. The super-surface structure 103 is formed by arranging metal patch units which are equivalent to negative dielectric constant materials and have the same size at equal intervals according to a 6 x 6 array.
The carrier 102 is a Polydimethylsiloxane (PDMS, transparent) material, which is resistant to high and low temperatures, can always maintain flexible characteristics, and has good dielectric properties. When the lower layer of the antenna structure is manufactured, firstly, glue is prepared, the PDMS glue is divided into glue A and glue B, the glue A and the glue B are mixed according to the proportion of 10:1, the PDMS (glue A) is placed firstly, then the curing agent (glue B) is placed to be fully mixed, the processed patch and the reflecting surface are placed into a volatilizing cylinder, and about 2 drops of modifier (methyl chlorosilane) are dropped for modification for three minutes. Spreading the tin foil in a dish, pouring glue, placing the tin foil on a reflecting surface, slightly compacting the tin foil, pouring the glue to ensure that the glue on the tin foil is free from bubbles, continuously pouring the glue, then placing a 6 multiplied by 6 unit patch at a position 1.5mm away from the reflecting surface, slightly compacting the patch, continuously pouring the glue, and after pouring, placing the material in a vacuum drying oven for defoaming. And (3) carefully tearing off the tinfoil after slight cooling, separating the cured PDMS from the tinfoil, finally carefully cutting the PDMS along the outer frame of the reflecting surface by using a cutter, and cutting off redundant materials according to a preset size to obtain the lower layer of the antenna structure.
The upper dielectric substrate 101 has a thickness h1FR-4 substrate having a relative dielectric constant ε of 0.5mmr4.4, center frequency f r10 GHz. Length L of upper dielectric substrate 1011Is 59mm, width W1Is 50 mm; the four insulating struts are FR-4 struts.
The carrier 102 has a length Wa of 120mm and a width La120mm, height h2Is 5 mm; thickness c of air layer3And is 8.5 mm. Super-surface structure 103 and the reflecting surface 104 is 1.5 mm.
Distance c of the super-surface structure 103 from the upper surface of the carrier 10221.5mm, the distance c of the reflecting surface 104 from the lower surface of the carrier 1021Is 2 mm.
The distance gap between the outer side of the outermost metal patch unit of the 6 × 6 metal patch units of the super-surface structure 103 and the edge of the nearest carrier 102 is 5mm, the length and width p of one metal patch unit are both 10mm, and the distance between two metal patch units is 10 mm.
The corrosion holes comprise two parts, wherein the first part 11 is a director structure arranged at the rear end of the upper radiation patch, the director structure is composed of ten identical arc-shaped corrosion holes, and the ten arc-shaped corrosion holes are arranged in a row from back to front and are arranged at equal intervals; one arc corrosion hole is composed of a minor arc arranged at the rear end and a front end chord corresponding to the minor arc, and the distance d between two adjacent front end chords42.5mm, center angle a of minor arc of rear end1Is 56°Length of front end string R312mm, the distance d between the vertex of the minor arc of the rear end and the chord of the front end21.5mm, each arc etch hole was oriented the same. The second part 12 is two approximately F-shaped corrosion holes which are arranged on the left side and the right side of the front end of the upper radiation patch and are in mirror symmetry, the open ends of the two approximately F-shaped corrosion holes face the left side and the right side of the upper radiation patch, and the symmetry plane of the two approximately F-shaped corrosion holes is coplanar with the symmetry plane of the director structure and the symmetry plane of the upper radiation patch in the front-back direction.
The rear end of the right side of the approximate F-shaped corrosion hole on the right side is an upper inferior arc, and the chord length R corresponding to the upper inferior arc110mm, the distance d of this chord from the front end chord of the arc-shaped erosion hole closest to the director structure 113Is 3 mm; distance L between vertex of inferior arc and corresponding chord72mm, central angle a corresponding to upper minor arc2Is 87 degrees; the right end of the upper inferior arc is closed by the right end of the upper line segment, the upper line segment is obtained by cutting off a section of the left end of the chord corresponding to the upper inferior arc, and a gap is formed between the left end of the upper line segment and the left end of the upper inferior arc;
the front end of the right side of the approximate F-shaped corrosion hole on the right side is a lower curve, the lower curve is a lower inferior arc with the left end cut off, and the length R of a chord corresponding to the lower inferior arc211mm, the distance L between the vertex of the inferior arc and the corresponding chord6Is 2 mm; the lower line segment is a structure that the middle part of the left side of the chord corresponding to the lower minor arc is cut off, namely, a gap is formed on the left side of the lower line segment; the upper minor arc is parallel to the lower curve, the upper line segment is parallel to the lower line segment, and the distance L between the upper line segment and the lower line segment4Is 8.5 mm; distance L between lower line segment and edge of lower end of upper radiation patch5Is 12.5 mm.
Distance W between left end of upper minor arc of approximately F-shaped corrosion hole on right side and right end of upper minor arc of approximately F-shaped corrosion hole on left side4Is 4 mm; the distance W between the left end of the upper line segment of the approximate F-shaped corrosion hole on the right side and the right end of the upper line segment of the approximate F-shaped corrosion hole on the left side3Is 6 mm; the distance W between the left end of the lower line segment of the approximate F-shaped corrosion hole on the right side and the right end of the lower line segment of the approximate F-shaped corrosion hole on the left side5Is 2 mm; the distance W between the lower end of the second extension line of the right-side approximately F-shaped corrosion hole and the lower end of the second extension line of the left-side approximately F-shaped corrosion hole2Is 4 mm.
The performance of the antenna obtained in this embodiment is tested by loading an excitation power source at the feed port (i.e., the upper radiation patch portion at the lower end between the two approximately "F" shaped corrosion holes on the upper layer) in a simulation manner, and the simulation result of the return loss curve of the antenna is shown in fig. 4. The simulation result shows that the center frequency of the antenna is 10GHz, and the working frequency band is 9.6 GHz-10.4 GHz. Return loss S of the antenna in this operating band11Below-20 dB, the bandwidth is near 880MHz, and the maximum gain of the antenna is 10.32dBi, which is simulated by E-Plane (E-Plane) and H-Plane (H-Plane) patterns are shown in FIG. 5.
The above examples are only illustrative of the technical idea and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Nothing in this specification is said to apply to the prior art.
Claims (10)
1. An airborne radar antenna loaded with a super-surface structure is characterized by comprising an upper layer, an air layer and a lower layer, wherein the upper layer is arranged above the lower layer in the middle; the four corners of the lower surface of the upper layer are provided with upper mounting holes, lower mounting holes are arranged on the upper surface of the lower layer opposite to the upper mounting holes, the upper mounting holes and the lower mounting holes opposite to the upper mounting holes are connected through matched insulating pillars to realize the assembly and alignment of the upper layer and the lower layer, and an air layer is formed by spacing the upper layer and the lower layer;
the upper layer comprises an upper radiation patch and an upper dielectric substrate, and the upper radiation patch is arranged on the upper surface of the upper dielectric substrate; the upper layer is of a defected structure and is obtained by corroding the upper radiation patch covering the upper surface of the upper dielectric substrate to obtain a corrosion hole and expose the upper dielectric substrate at the corresponding position;
the corrosion holes comprise two parts, wherein the first part is a director structure arranged at the rear end of the upper radiation patch, the director structure is composed of ten identical arc-shaped corrosion holes, and the ten arc-shaped corrosion holes are arranged in a row from back to front and are arranged at equal intervals; the arc corrosion holes are formed by minor arcs arranged at the rear end and front end chords corresponding to the minor arcs, and the orientation of each arc corrosion hole is the same; the second part is two approximately F-shaped corrosion holes which are arranged on the left side and the right side of the front end of the upper radiation patch and are mirror-symmetrical; the open ends of the two approximate F-shaped corrosion holes face the left side and the right side of the upper radiation patch, and the symmetrical planes of the two approximate F-shaped corrosion holes are coplanar with the symmetrical plane of the director structure and the symmetrical plane of the upper radiation patch in the front-back direction;
the rear end of the right side of the approximate F-shaped corrosion hole on the right side is an upper inferior arc, and the right end of the upper inferior arc is closed by the right end of the upper line segment; the upper line segment is obtained by cutting off a section of the left end of the chord corresponding to the upper minor arc, and a gap is formed between the left end of the upper line segment and the left end of the upper minor arc; the front end of the right side of the approximate F-shaped corrosion hole on the right side is a lower curve, and the lower curve is a lower minor arc with the left end cut off; the right end of the lower curve is closed by the right end of the lower line segment, and the middle part of the left side of the lower line segment, which is a chord corresponding to the lower minor arc, is cut off, namely a gap exists on the left side of the lower line segment; the upper minor arc is parallel to the lower curve, and the upper line segment is parallel to the lower line segment;
the left end of the inferior arc on the upper part is connected with the left end of the gap on the left side of the lower line segment through a first connecting line which is vertical to the upper line segment; the left end of the upper line segment is connected with the left end of the lower curve through a second connecting line, and the included angle between the second connecting line and the upper line segment is an obtuse angle; the left end of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a first extension line, and the first extension line is vertical to the lower line segment; the right end of the notch on the left side of the lower line segment is connected with the edge of the lower end of the upper radiation patch through a second extension line, and the second connection line and the second extension line are positioned on the same straight line;
the lower layer comprises a carrier, and a super-surface structure and a reflecting surface which are arranged in the carrier, wherein the super-surface structure is arranged on the upper side in the carrier, the reflecting surface is arranged on the lower side in the carrier, and the horizontal section of the carrier is consistent with the reflecting surface; the super-surface structure is arranged above the reflecting surface in a spatially centered manner; the super-surface structure is formed by arranging metal patch units with the same size at equal intervals according to an n x n array, wherein n is an integer not less than 2.
2. The airborne radar antenna loaded with the super-surface structure as recited in claim 1, wherein the super-surface structure is formed by arranging metal patch units with the same size at equal intervals according to a 6 x 6 array.
3. The airborne radar antenna loaded with the super-surface structure is characterized in that the FR-4 substrate with the thickness of 0.5mm is selected as the upper dielectric substrate, the relative dielectric constant of the FR-4 substrate is 4.4, and the central frequency of the FR-4 substrate is 10 GHz; the insulating support posts are FR-4 support posts.
4. The airborne radar antenna with the loaded super-surface structure as recited in claim 1 or 3, wherein the length of the upper dielectric substrate is 59mm, and the width of the upper dielectric substrate is 50 mm.
5. The airborne radar antenna with super-surface structure loaded thereon according to claim 1, wherein the carrier has a length of 120mm, a width of 120mm and a height of 5 mm.
6. The airborne radar antenna with super-surface structure loaded thereon according to claim 1, wherein the thickness of the air layer is 8.5 mm.
7. The airborne radar antenna with loaded super-surface structure as recited in claim 1, wherein the distance between the super-surface structure and the reflecting surface is 1.5 mm; the distance between the super-surface structure and the upper surface of the carrier is 1.5mm, and the distance between the reflecting surface and the lower surface of the carrier is 2 mm.
8. The airborne radar antenna loaded with the super-surface structure according to any one of claims 1, 2 and 7, wherein the distance between the outer side of the outermost metal patch unit of the metal patch units of the super-surface structure and the edge of the nearest carrier is 5mm, the length and the width of one metal patch unit are both 10mm, and the two metal patch units are spaced by 10 mm.
9. The airborne radar antenna loaded with the super-surface structure as recited in claim 1, wherein the distance between two adjacent front end chords of ten arc-shaped corrosion holes is 2.5mm, and the central angle of a minor arc at the rear end is 56°The length of the front end chord is 12mm, and the distance between the top point of the minor arc at the rear end and the front end chord is 1.5 mm;
the chord length corresponding to the inferior arc of the upper part of the approximate F-shaped corrosion hole on the right side is 10mm, and the distance between the chord length and the front end chord of the arc-shaped corrosion hole closest to the director structure is 3 mm; the distance between the vertex of the upper inferior arc and the corresponding chord is 2mm, and the central angle corresponding to the upper inferior arc is 87 degrees;
the lower curve of the approximate F-shaped corrosion hole on the right side is a lower inferior arc with the left end cut off, the length of a chord corresponding to the lower inferior arc is 11mm, and the distance between the vertex of the lower inferior arc and the chord corresponding to the inferior arc is 2 mm; the distance between the upper line segment and the lower line segment is 8.5 mm; the distance between the lower line segment and the edge of the lower end of the upper radiation patch is 12.5 mm;
the distance between the left end of the upper inferior arc of the approximately F-shaped corrosion hole on the right side and the right end of the upper inferior arc of the approximately F-shaped corrosion hole on the left side is 4 mm; the distance between the left end of the upper line segment of the approximate F-shaped corrosion hole on the right side and the right end of the upper line segment of the approximate F-shaped corrosion hole on the left side is 6 mm; the distance between the left end of the lower line segment of the approximate F-shaped corrosion hole on the right side and the right end of the lower line segment of the approximate F-shaped corrosion hole on the left side is 2 mm; the distance between the lower end of the second extension line of the right-side approximately F-shaped corrosion hole and the lower end of the second extension line of the left-side approximately F-shaped corrosion hole is 4 mm.
10. The airborne radar antenna with loading super-surface structure according to any of the claims 1 and 5, characterized in that the carrier is made of polydimethylsiloxane material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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