Millimeter wave infrared common aperture antenna based on frequency selective surface

Abstract

The invention provides a millimeter wave infrared common-aperture antenna based on a frequency selective surface, and relates to the crossing field of optical and microwave detection technologies. The system comprises the frequency selective surface primary and secondary mirrors, the millimeter wave array antenna and the infrared imaging system which are coaxially arranged, the frequency selective surface primary and secondary mirror technology is adopted, the infrared imaging system and the millimeter wave array antenna are effectively compatible, and mutual shielding of detection view fields of the infrared imaging system and the millimeter wave array antenna and occupation of excessive load resources by a deflection structure are avoided. The functions of infrared large-range search detection and directional beam forming, precise tracking, fine recognition and striking guiding of the millimeter wave array are achieved, and a new means is provided for space-based optical and microwave common-aperture cooperative detection.

Description

Technical Field

[0001] The invention relates to the intersection of optical and microwave detection technologies, and in particular to a millimeter wave infrared common aperture antenna based on a frequency selective surface. Background Art

[0002] In the process of composite detection, the infrared imaging system realizes large-scale search and detection, provides guidance and indication information to the millimeter-wave array radar, and the millimeter-wave array completes precise tracking, fine identification, and guided strikes, etc. Due to the large difference in hardware between millimeter-wave detection and infrared detection, how to achieve coaxiality between the two and reduce mutual interference between the two is the main difficulty of millimeter-wave infrared co-aperture.

[0003] At present, the millimeter-wave infrared common aperture at home and abroad uses the Cassegrain optical imaging system compatible with the microwave parabolic antenna and uses mechanical deflection to achieve tracking, but the detection fields of the two block each other and the deflection structure occupies too many load resources. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a millimeter-wave infrared common-aperture antenna based on a frequency selective surface, which solves the technical problems of the traditional common-aperture design scheme in which the detection field of view is mutually blocked and the mechanical deflection structure occupies too many load resources.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A millimeter wave infrared common aperture antenna based on a frequency selective surface, comprising a coaxially arranged frequency selective surface primary and secondary mirrors, a millimeter wave array antenna and an infrared imaging system;

[0009] The primary and secondary mirrors of the frequency selective surface adopt a reverse optical millimeter wave transmission design for secondary reflection of infrared information and transmission of millimeter waves;

[0010] The millimeter wave array antenna is provided with a light aperture for providing infrared information to pass through, and is used to receive the millimeter wave;

[0011] The infrared imaging system is located on a side of the clear aperture away from the primary and secondary mirrors of the frequency selective surface, so as to receive the infrared information.

[0012] Preferably, the frequency selective surface primary and secondary mirrors include a frequency selective surface primary mirror and a frequency selective surface secondary mirror;

[0013] The frequency selective surface primary mirror is provided with a hole, and is used for first reflection of infrared information;

[0014] The frequency selective surface secondary mirror is used for secondarily reflecting the infrared information reflected by the frequency selective surface primary mirror, so that the infrared information passes through the hole and the clear aperture in sequence.

[0015] Preferably, the surfaces of the primary and secondary frequency selective surface mirrors are formed of a plurality of identical units arranged in a two-dimensional periodic manner to form a single-layer or multi-layer planar structure.

[0016] Preferably, the unit is a cross gap, a Y-shaped gap, a cross fractal or a Y-shaped fractal.

[0017] Preferably, the substrate of the primary and secondary frequency selective surface mirrors is Rogers 5880 or silicon dioxide.

[0018] Preferably, the antenna unit of the millimeter wave array antenna is in the form of a microstrip patch antenna unit, which is coaxially fed, and the coaxial line below passes through the dielectric substrate and the microstrip patch welding dielectric on the top surface.

[0019] Preferably, the dielectric substrate is Rogers 6002.

[0020] Preferably, the working mode of the millimeter wave array antenna is active detection.

[0021] Preferably, the infrared imaging system adopts passive staring focal plane detection.

[0022] (III) Beneficial effects

[0023] The present invention provides a millimeter wave infrared common aperture antenna based on a frequency selective surface. Compared with the prior art, it has the following beneficial effects:

[0024] The present invention comprises a coaxially arranged frequency selective surface primary and secondary mirrors, a millimeter wave array antenna and an infrared imaging system; the frequency selective surface primary and secondary mirrors adopt a reflective optical millimeter wave transmission design, which is used for secondary reflection of infrared information and transmission of millimeter waves; the millimeter wave array antenna is provided with a light aperture for providing infrared information to pass through, and is used for receiving millimeter waves; the infrared imaging system is located on the side of the light aperture away from the frequency selective surface primary and secondary mirrors, so as to receive infrared information. The present invention adopts the frequency selective surface primary and secondary mirror technology, effectively compatible with the infrared imaging system and the millimeter wave array antenna, avoiding mutual occupancy of the detection field of the two and the deflection structure occupying too much load resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a millimeter-wave infrared common-aperture antenna based on a frequency selective surface provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a frequency selective surface primary and secondary mirror provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of a millimeter wave array antenna provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Millimeter-wave radar has good all-weather combat capability and is relatively easy to detect moving targets. However, its detection accuracy is lower than that of optics, and it is susceptible to complex ground clutter and electromagnetic interference imposed by the enemy in air-to-ground combat situations. Optical imaging uses passive detection and is not easily affected by electronic interference, but automatic target recognition of optical images with complex ground backgrounds is difficult and is easily affected by adverse environments such as fog, smoke, dust or snow. "Millimeter wave + infrared" dual-mode collaborative detection helps to improve the system's anti-interference ability and multi-task combat capability under different natural environmental conditions, realize accurate detection, identification and continuous tracking of moving targets, and break through the wide-area distributed panoramic and wide-spectrum detection system architecture.

[0031] Based on this understanding, the embodiment of the present application innovatively provides a millimeter-wave infrared common aperture antenna based on a frequency selective surface, which realizes the common aperture detection problem of microwave and optics through the frequency selective surface, is suitable for small-caliber design, and solves the technical problems of mutual obstruction of the detection field of view of the traditional common aperture design scheme and excessive load resources occupied by the mechanical deflection structure, and realizes the functions of infrared large-scale search detection and millimeter-wave array to complete pointing beam synthesis, precise tracking, fine identification, and guided strike, providing a new means for space-based optical and microwave common aperture collaborative detection. In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings in the specification and the specific implementation methods.

[0032] Example:

[0033] like Figure 1As shown, an embodiment of the present invention provides a millimeter-wave infrared common-aperture antenna based on a frequency selective surface, including coaxially arranged frequency selective surface primary and secondary mirrors, a millimeter-wave array antenna, and an infrared imaging system.

[0034] The frequency selective surface primary and secondary mirrors adopt a reverse optical millimeter wave transmission design and are used for secondary reflection of infrared information and transmission of millimeter waves.

[0035] The millimeter wave array antenna is provided with a light-transmitting aperture for allowing infrared information to pass through, and is used to receive the millimeter wave.

[0036] The infrared imaging system is located on a side of the clear aperture away from the primary and secondary mirrors of the frequency selective surface, so as to receive the infrared information.

[0037] The embodiment of the present invention adopts the frequency selective surface primary and secondary mirror technology, which effectively makes the infrared imaging system and the millimeter wave array antenna compatible, avoiding mutual obstruction of the detection fields of the two and the deflection structure occupying too many load resources.

[0038] Since the frequency selective surface primary and secondary mirrors, millimeter wave array antenna and infrared imaging system are coaxially arranged, Figure 1 The millimeter wave array antenna shown adopts a central light aperture design, so that infrared information can smoothly enter the infrared imaging system through the millimeter wave array antenna for processing, so as to ensure the performance of the infrared imaging system.

[0039] like Figures 1-2 As shown, in an optional embodiment, the frequency selective surface primary and secondary mirrors include a frequency selective surface primary mirror and a frequency selective surface secondary mirror (actually, a primary mirror using a concave reflector and a secondary mirror using a convex reflector, the two together form a classic Cassegrain system), wherein:

[0040] The frequency selective surface primary mirror is provided with a hole, and is used for first reflection of infrared information;

[0041] The frequency selective surface secondary mirror is used for secondarily reflecting the infrared information reflected by the frequency selective surface primary mirror, so that the infrared information passes through the hole and the clear aperture in sequence.

[0042] The substrates of the primary and secondary frequency selective surface mirrors are made of millimeter wave transparent materials, and the substrates of the primary and secondary frequency selective surface mirrors are Rogers 5880 or silicon dioxide to ensure the performance of the millimeter wave array antenna.

[0043] like Figure 2 As shown, in an optional embodiment, the surface of the primary and secondary frequency selective surface mirrors uses a number of identical units, which are arranged in a two-dimensional periodic manner to form a single-layer or multi-layer planar structure.

[0044] Exemplarily, the unit here may be a cross gap, a Y-shaped gap, a cross fractal, a Y-shaped fractal, or the like.

[0045] It can be understood that since the frequency selective surface itself does not absorb energy, its main feature is that it can present filtering characteristics for electromagnetic waves at different frequencies, incident angles and polarization states. The embodiment of the present invention can set the passband of the primary and secondary mirrors in the millimeter wave frequency band through design, and the unit can use gold-plated materials and increase its occupancy rate on the primary and secondary mirror surfaces to achieve high efficiency reflection of infrared information.

[0046] like Figure 3 As shown, in an optional embodiment, the antenna unit of the millimeter wave array antenna is in the form of a microstrip patch antenna unit, coaxially fed, and the coaxial below passes through the dielectric substrate and the microstrip patch welding dielectric on the top surface.

[0047] Furthermore, the dielectric substrate is Rogers 6002, and the dielectric substrate integrates power division, power distribution and other networks.

[0048] It should be noted that this is only an example, and other antenna unit forms, dielectric substrates and feeding methods may also be used.

[0049] In addition, it should be understood that the array arrangement of the millimeter wave array antenna is a basic array design, which can be a one-dimensional or two-dimensional periodic arrangement, and the grid can be rectangular and triangular, which is determined by the specific design requirements and is not limited to uniqueness here.

[0050] In an optional embodiment, the millimeter wave array antenna operates in an active detection mode, thereby being able to form a directional beam based on infrared information, provide information such as distance, position, radial length, and continue tracking.

[0051] In particular, in an optional implementation, the embodiment of the present invention further defines that the infrared imaging system adopts passive staring focal plane detection, thereby being able to obtain information such as position and target contour features and provide it to the millimeter wave array antenna.

[0052] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The embodiment of the present invention adopts the frequency selective surface primary and secondary mirror technology, which effectively makes the infrared imaging system and the millimeter wave array antenna compatible, avoiding the mutual obstruction of the detection fields of the two and the deflection structure occupying too many load resources.

[0054] 2. The embodiments of the present invention realize infrared large-range search and detection and millimeter-wave array to complete the functions of pointing beam synthesis, precise tracking, fine identification, and guided strike, providing a new means for space-based optical and microwave co-aperture collaborative detection.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A millimeter wave infrared common aperture antenna based on a frequency selective surface, characterized in that: It includes coaxially arranged frequency selective surface primary and secondary mirrors, millimeter wave array antenna and infrared imaging system; The primary and secondary mirrors of the frequency selective surface adopt a reverse optical millimeter wave transmission design for secondary reflection of infrared information and transmission of millimeter waves; The millimeter wave array antenna is provided with a light aperture for providing infrared information to pass through, and is used to receive the millimeter wave; The infrared imaging system is located on a side of the clear aperture away from the primary and secondary mirrors of the frequency selective surface, so as to receive the infrared information.

2. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The frequency selective surface primary and secondary mirrors include a frequency selective surface primary mirror and a frequency selective surface secondary mirror; The frequency selective surface primary mirror is provided with a hole, and is used for first reflection of infrared information; The frequency selective surface secondary mirror is used for secondarily reflecting the infrared information reflected by the frequency selective surface primary mirror, so that the infrared information passes through the hole and the clear aperture in sequence.

3. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The surfaces of the primary and secondary frequency selective surface mirrors are formed of a plurality of identical units arranged in a two-dimensional periodic manner to form a single-layer or multi-layer planar structure.

4. The millimeter wave infrared common aperture antenna according to claim 3, characterized in that: The unit is a cross gap, a Y-shaped gap, a cross fractal or a Y-shaped fractal.

5. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The substrates of the primary and secondary frequency selective surface mirrors are Rogers 5880 or silicon dioxide.

6. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The antenna unit of the millimeter wave array antenna adopts the form of a microstrip patch antenna unit, which is coaxially fed, and the coaxial line below passes through the dielectric substrate and the microstrip patch welding dielectric on the top surface.

7. The millimeter wave infrared common aperture antenna according to claim 6, characterized in that: The dielectric substrate is Rogers6002.

8. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The working mode of the millimeter wave array antenna is active detection.

9. The millimeter wave infrared common aperture antenna according to claim 1, characterized in that: The infrared imaging system adopts passive staring focal plane detection.

Images