CN113126171B - Reconfigurable reflection type lens antenna and detection method - Google Patents
Reconfigurable reflection type lens antenna and detection method Download PDFInfo
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- CN113126171B CN113126171B CN202110317622.7A CN202110317622A CN113126171B CN 113126171 B CN113126171 B CN 113126171B CN 202110317622 A CN202110317622 A CN 202110317622A CN 113126171 B CN113126171 B CN 113126171B
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- 230000011514 reflex Effects 0.000 claims 3
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- 230000000149 penetrating effect Effects 0.000 abstract description 24
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- 238000010586 diagram Methods 0.000 description 11
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- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 210000003644 lens cell Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
- H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
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Abstract
The embodiment of the invention provides a reconfigurable reflection type lens antenna and a detection method, wherein the reconfigurable reflection type lens antenna comprises a feed source antenna, a reconfigurable lens and a controller electrically connected with the reconfigurable lens; the feed source antenna is used for radiating electromagnetic waves to the reconfigurable lens; the reconfigurable lens is used for generating a plurality of detection beams based on detection requirements under the control of the controller. The reconfigurable reflection-type lens antenna provided by the embodiment of the invention is mainly applied to the ground penetrating radar system, and due to the fact that the reconfigurable lens technology is introduced into the antenna design of the ground penetrating radar system, the designed antenna can utilize reusable software and hardware resources, and can change radiated electromagnetic beams more flexibly according to different detection environments and detection requirements, so that the detection precision and efficiency are greatly improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of geological exploration, in particular to a reconfigurable reflection type lens antenna and a detection method.
Background
Early ground penetrating radar system is mostly the form of single antenna, because the gain of single antenna is not high and radiation direction is fixed, consequently makes ground penetrating radar system's detection depth and detection efficiency relatively poor, in order to solve above-mentioned problem, multichannel ground penetrating radar system takes place. The multi-channel ground penetrating radar system is characterized in that a plurality of antennas are placed in parallel, the antennas radiate electromagnetic beams to the position right below the antennas simultaneously, array detection is achieved through the combination of the antennas, the multi-channel technology enables the detection area covered by one-time detection to be increased, the detection efficiency of the ground penetrating radar system is improved to a certain extent, but the coverage range of the array is required to be wide, so that the array size is large, the width of the array can reach several meters, meanwhile, the feed network is more complex, and the cost is increased.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a reconfigurable reflection type lens antenna and a detection method.
In a first aspect, an embodiment of the present invention provides a reconfigurable reflective lens antenna, including a feed antenna, a reconfigurable lens, and a controller electrically connected to the reconfigurable lens; wherein,
the feed source antenna is used for radiating electromagnetic waves to the reconfigurable lens;
the reconfigurable lens is used for generating a plurality of detection beams based on detection requirements under the control of the controller.
In some embodiments, the feed antenna is a horn antenna, a Vivaldi antenna, or a yagi antenna.
In some embodiments, the reconfigurable lens includes a dielectric plate and a plurality of lens units disposed on the dielectric plate, each lens unit includes a first metal structure, a second metal structure and an active device, wherein the first metal structure and the second metal structure are disposed at intervals and are symmetrically distributed, and the active device is electrically connected to the first metal structure and the second metal structure, respectively.
In some embodiments, the dielectric board is made of FR4 material, and the active device is a PIN diode.
In some embodiments, a side of the dielectric plate away from the plurality of lens units is provided with a dc feeder, and the dc feeder is electrically connected to the first metal structure and/or the second metal structure through a metal pillar.
In some embodiments, the length of the dc feed line is an odd multiple of λ/4, where λ is a wavelength corresponding to an operating frequency of the lens unit.
In some embodiments, the controller is electrically connected to the plurality of PIN diodes in the reconfigurable lens through a plurality of bias circuits, respectively.
In some embodiments, the controller controls the state of the PIN diode by adjusting the voltage of the bias circuit to adjust the phase of the lens unit, and the lens unit generates a corresponding detection beam according to a detection requirement based on the phase of the lens unit.
In some embodiments, the distance between the feed antenna and the reconfigurable lens is 2/3 of the far field distance of the feed antenna.
In a second aspect, an embodiment of the present invention provides a detection method based on the reconfigurable reflection-type lens antenna of the first aspect, where the detection method includes:
the feed source antenna radiates electromagnetic waves to the reconfigurable lens;
the controller controls a phase distribution of lens elements in the reconfigurable lens to generate a plurality of probe beams.
The reconfigurable reflection-type lens antenna and the detection method provided by the embodiment of the invention design a ground penetrating radar system with intelligently and dynamically adjustable detection beams by introducing a reconfigurable lens technology into the antenna design of the ground penetrating radar system, and the designed ground penetrating radar antenna comprises a feed source antenna, a reconfigurable lens and a controller. The reconfigurable ground penetrating radar antenna utilizes reusable software and hardware resources, and changes electromagnetic wave beams radiated by the antenna more flexibly according to different detection environments and detection requirements, so that the detection precision and efficiency are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a structure and an application scenario of a reconfigurable reflective lens antenna according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a general structural configuration of a reconfigurable lens provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a lens unit according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the relationship between the operating state of the PIN diode and the parameters of the lens unit according to an embodiment of the present invention;
FIG. 5 is a diagram of a phase distribution of lens units and a beam pattern for detecting a beam of an object in-10 and 30 directions according to an embodiment of the present invention;
FIG. 6 is a flow chart of a reconfigurable reflection lens antenna smart detection provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of two detection modes provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Early ground penetrating radar system is mostly the form of single antenna, because the gain of single antenna is not high and radiation direction is fixed, consequently makes ground penetrating radar system's detection depth and detection efficiency relatively poor, in order to solve above-mentioned problem, multichannel ground penetrating radar system takes place. The multi-channel ground penetrating radar system is characterized in that a plurality of antennas are placed in parallel, the antennas radiate electromagnetic beams to the position right below the antennas simultaneously, array detection is achieved through the combination of the antennas, the multi-channel technology enables the detection area covered by one-time detection to be increased, the detection efficiency of the ground penetrating radar system is improved to a certain extent, but the coverage range of the array is required to be wide, so that the array size is large, the width of the array can reach several meters, meanwhile, the feed network is more complex, and the cost is increased. In order to solve the above technical problem, embodiments of the present invention provide a reconfigurable reflection lens antenna and a detection method based on the reconfigurable reflection lens antenna, which are described in detail below.
The embodiment of the invention provides a reconfigurable reflection type lens antenna which can be applied to the fields of geological exploration and the like.
Fig. 1 is a schematic diagram of a structure and an application scenario of a reconfigurable reflection lens antenna according to an embodiment of the present invention, where the reconfigurable reflection lens antenna is preferably a reconfigurable reflection lens antenna operating at 2 GHz. As shown in fig. 1, the reconfigurable reflective lens antenna includes a feed antenna 1, a reconfigurable lens 2, and a controller 3 electrically connected to the reconfigurable lens 2.
The feed source antenna 1 and the reconfigurable lens 2 are both positioned in a hollow metal back cavity 4 with an opening facing the earth surface, the reconfigurable lens 2 is positioned in the metal back cavity 4 and the cavity wall opposite to the opening, and the feed source antenna 1 is positioned between the reconfigurable lens 2 and the earth surface 5. The feed antenna 1 is used for radiating electromagnetic waves to the reconfigurable lens 2, and the reconfigurable lens 2 is used for generating a plurality of detection beams radiated to the earth surface 5 based on detection requirements under the control of the controller 3 so as to detect the underground abnormal body 6 below the earth surface.
Fig. 2 is a schematic diagram illustrating a general structural composition of a reconfigurable lens according to an embodiment of the present invention, and as shown in fig. 1 and fig. 2, the reconfigurable lens 2 includes a dielectric plate 200 and a plurality of lens units 20 disposed on the dielectric plate 200.
The dielectric plate 200 is usually made of FR4, Rogers, F4B, or other insulating materials, the lens units 20 are arranged in an array, the feed antenna 1 radiates electromagnetic waves to the reconfigurable lens 2, that is, radiates electromagnetic waves to the lens units 20, and each lens unit 20 can generate a corresponding detection beam based on a detection requirement under the control of the controller 3 and radiate the detection beam to the ground. It should be noted that the controller 3 can control the plurality of lens units 20 respectively, so that the plurality of lens units 20 generate corresponding probe beams based on the detection requirement respectively, and beam parameters of the plurality of probe beams are the same or different, where the beam parameters may include any one or a combination of more of a beam direction, a beam width, and a beam gain, and this is not limited in this embodiment of the present invention. The controller 3 may be a field programmable gate array, a single chip or other type of microprocessor.
The reconfigurable reflection-type lens antenna provided by the embodiment of the invention is mainly applied to the ground penetrating radar system, and due to the fact that the reconfigurable lens technology is introduced into the antenna design of the ground penetrating radar system, the designed antenna can utilize reusable software and hardware resources, and can change radiated electromagnetic beams more flexibly according to different detection environments and detection requirements, so that the detection precision and efficiency are greatly improved.
Based on the above embodiments, the feed antenna 1 is specifically described in the embodiments of the present invention. The feed source antenna 1 is an antenna with directional radiation characteristics, such as a horn antenna, a Vivaldi antenna or a yagi antenna, and it can be understood that the directivity of the antenna with directional radiation characteristics is good, and the feed source antenna 1 in the embodiment of the present invention is selected as the above antenna, so that electromagnetic waves can be accurately radiated to the reconfigurable lens 2.
Based on the above embodiments, the embodiments of the present invention specifically explain the reconfigurable lens 2. Fig. 3 is a schematic structural diagram of a lens unit according to an embodiment of the present invention, and as shown in part (a) of fig. 3, each lens unit 20 includes a first metal structure 201, a second metal structure 202, and an active device 203, where the first metal structure 201 and the second metal structure 202 are disposed at intervals and symmetrically distributed, and the active device 203 is electrically connected to the first metal structure 201 and the second metal structure 202, respectively.
It should be noted that each lens unit 20 includes a first metal structure 201 and a second metal structure 202 that are disposed at an interval and symmetrically distributed, and the first metal structure 201 and the second metal structure 202 are printed on the dielectric board 200. In other words, the first metal structure 201 and the second metal structure 202 have the same shape and the same area, wherein the first metal structure 201 and the second metal structure 202 shown in part (a) of fig. 3 have the same rectangular shape and the same area.
Each lens cell 20 further comprises an active device 203, the active device 203 being disposed between the first metal structure 201 and the second metal structure 202 and electrically connecting the first metal structure 201 and the second metal structure 202, respectively. The active device 203 is a device capable of controlling the phase of the lens unit 20, such as a PIN diode, a varactor diode, or a micro-electromechanical system, for example, the active device 203 is a PIN diode, and two ends of the PIN diode are electrically connected to the first metal structure 201 and the second metal structure 202, respectively.
It should be noted that, in the manufacturing process, since the reconfigurable lens 2 can be realized by the printed circuit board technology, and the metal with a special structure is printed on the insulating dielectric substrate material, that is, the dielectric plate 200, the manufacturing cost of the reconfigurable lens 2 provided by the embodiment of the present invention is equal to the price of a common circuit board, and the cost performance is high, so that the reconfigurable lens is suitable for large-scale production and application.
Based on the above embodiments, the dielectric board 200 in the reconfigurable lens 2 provided by the embodiment of the present invention is made of FR4 material, and the active device 203 is preferably a PIN diode. The purpose of selecting the material of the dielectric board 200 as FR4 in the present embodiment is to reduce the cost of the reconfigurable lens 2.
Based on the above embodiments, the present embodiment further explains the unit structure of the reconfigurable lens 2. As shown in part (b) of fig. 3, a side of the dielectric board 200 away from the lens unit 20 is provided with a dc feed line 204, and the dc feed line 204 is electrically connected to the first metal structure 201 and/or the second metal structure 202 through a metal post.
Specifically, in order to reduce the interference of the dc signal to the electromagnetic wave, the dc feed line 204 is disposed on the side of the dielectric board 200 away from the lens unit 20, that is, the dc feed line 204 is disposed on the back surface of the lens unit 20. The length of the dc feed line 204 is an odd multiple of λ/4, where λ is a wavelength corresponding to the operating frequency of the lens unit 20. The shape of the dc feed line 204 shown in part (b) of fig. 3 is a right-angle shape, but in other embodiments, the dc feed line 204 may also have other shapes, and this is not particularly limited in this embodiment of the present invention.
Based on the above embodiments, in the embodiment of the present invention, the controller 3 is electrically connected to a plurality of PIN diodes in the reconfigurable lens 2 through a plurality of bias circuits, respectively.
Specifically, the plurality of bias circuits are respectively connected with the plurality of PIN diodes in a one-to-one correspondence manner through voltage bias lines 300, the controller 3 is respectively connected with the plurality of bias circuits in a one-to-one correspondence manner, the voltages of the plurality of bias circuits can be respectively controlled through the controller 3, each bias circuit can control the state of the PIN diode based on the voltage of the bias circuit, and then the lens unit 20 is adjusted to realize the switching of two phases of 0 ° and 180 °. Fig. 4 is a diagram of the relationship between the operating state of the PIN diode and the parameters of the lens unit, and as shown in fig. 4, when the PIN diode is in the off state, the phase of the lens unit 20 is 0 °, and when the PIN diode is in the off state, the phase of the lens unit 20 is 180 °. Note that, in actual design, there may be a deviation of ± 20 ° in the phase of the lens unit 20.
Based on the above-described embodiment, the controller 3 controls the state of the PIN diode by adjusting the voltage of the bias circuit to adjust the phase of the lens unit 20, and the lens unit 20 generates a corresponding probe beam from the received electromagnetic wave based on its own phase.
Specifically, the phase of the lens unit 20 is correlated with the state of the PIN diode, and when the PIN diode is in the off state, the phase of the lens unit 20 is 0 °, and when the PIN diode is in the off state, the phase of the lens unit 20 is 180 °. The phase of the lens unit 20 is related to the probe beam generated by the lens unit 20 based on the received electromagnetic wave, and therefore, by setting the voltage of the bias circuit of each lens unit 20 in the reconfigurable lens 2, the phase modulation function of the lens unit 20 can be realized, so that the reconfigurable lens 2 has the characteristics of dynamic beam scanning, beam agility, multi-beam, and the like. In an actual design, the distribution of the unit phases in the reconfigurable lens under different target beams can be calculated through the joint simulation of MATLAB and full-wave electromagnetic simulation software, which is illustrated in fig. 5. And simultaneously storing the voltages corresponding to different lens unit phases into the controller in the form of an information codebook.
Based on the above embodiments, the embodiments of the present invention describe a detection method based on the above reconfigurable reflection lens antenna. Fig. 6 is a flowchart of the reconfigurable reflection lens antenna intelligent detection provided by the embodiment of the present invention, and since the intelligent detection flow is shown in detail in the diagram, it is not described herein again. Fig. 7 is a schematic diagram of two detection modes provided by an embodiment of the present invention, in which part (a) in fig. 7 shows a wide-beam coarse-scan detection mode, and part (b) in fig. 7 shows a narrow-beam fine-scan detection mode.
In summary, the protection points of the reconfigurable reflection lens antenna provided by the embodiment of the invention are as follows:
1. the reconfigurable reflection type lens antenna provided by the embodiment of the invention comprises a feed source antenna, a reconfigurable lens and a controller, and can detect a target area more comprehensively and accurately on the premise of ensuring that the position of a ground penetrating radar system is not changed, so that the detection precision and efficiency are improved.
2. Reconfigurable lens technology, although it has already been applied to mobile communication and microwave imaging systems, the propagation path of electromagnetic waves in the above application fields is often air or free space, and the implementation is relatively simple. However, the reconfigurable lens technology mentioned in the embodiments of the present invention needs to consider the complex and variable characteristics of the underground environment during the design, so the design is more complex.
3. The intelligent beam control mechanism is used for coding and sequencing the working states of the unit structures in the reconfigurable lens, storing the information codebook in the controller, and switching the working states of the lens units through a field programmable gate array or other types of microprocessors during actual work, so that target beams are quickly and accurately obtained, and the detection efficiency is improved.
4. The beam scanning ground penetrating radar can be used for a ground penetrating radar working in a frequency band of hundreds of MHz, and can also be used for a microwave imaging system working in a GHz band and a millimeter wave imaging system working in a THz band.
The reconfigurable reflection-type lens antenna provided by the embodiment of the invention has the following beneficial effects:
1. under the condition of adopting a single antenna, the beam focusing capability and the gain are greatly improved. The detection depth is greatly improved, and meanwhile, the effective detection range generated by beam scanning is far larger than that of a single antenna.
2. Compared with the traditional multi-channel ground penetrating radar with the beam scanning function, the ground penetrating radar based on the reconfigurable reflection type lens antenna has smaller physical size, meanwhile, a complex and heavy radio frequency front end component in the traditional phased array radar is not needed, and the requirement of portability is met.
3. The scanning beam direction is more flexible and intelligent. In actual work, rapid and accurate beam pointing can be provided in a detection area according to abnormal body conditions, and detection precision and efficiency are improved.
4. The reconfigurable reflection-type lens antenna has the advantages of dynamic adjustable characteristic, low cost and the like, has wide application prospect in the fields of ground penetrating radar and the like, and can be expanded to a microwave and millimeter wave imaging system with higher frequency according to the working principle and the implementation mode.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A reconfigurable reflective lens antenna, comprising a feed antenna, a reconfigurable lens, and a controller electrically connected to the reconfigurable lens; wherein,
the feed source antenna is used for radiating electromagnetic waves to the reconfigurable lens;
the reconfigurable lens is used for generating a plurality of detection beams based on detection requirements under the control of the controller;
the feed source antenna and the reconfigurable lens are both positioned in a hollow metal back cavity with an opening facing the earth surface, the reconfigurable lens is positioned in the wall of the metal back cavity opposite to the opening, and the feed source antenna is positioned between the reconfigurable lens and the earth surface;
the reconfigurable lens comprises a dielectric slab and a plurality of lens units arranged on the dielectric slab, wherein each lens unit comprises a first metal structure, a second metal structure and an active device, the first metal structures and the second metal structures are arranged at intervals and are symmetrically distributed, and the active devices are respectively and electrically connected with the first metal structures and the second metal structures.
2. The reconfigurable reflective lens antenna of claim 1, wherein the feed antenna is a horn antenna, a Vivaldi antenna, or a yagi antenna.
3. The reconfigurable reflective lens antenna of claim 1, wherein the dielectric board is fabricated from FR4 material and the active device is a PIN diode.
4. The reconfigurable reflective lens antenna of claim 1, wherein a side of the dielectric plate remote from the plurality of lens elements is provided with a dc feed line, the dc feed line being electrically connected to the first metal structure and/or the second metal structure by a metal post.
5. The reconfigurable reflective lens antenna of claim 4, wherein the length of the DC feed line is an odd multiple of λ/4, where λ is a wavelength corresponding to an operating frequency of the lens unit.
6. The reconfigurable reflex lens antenna of claim 3, wherein the controller is electrically connected to the plurality of PIN diodes in the reconfigurable lens through a plurality of bias circuits, respectively.
7. The reconfigurable reflex lens antenna of claim 6, wherein the controller controls the state of the PIN diode by adjusting the voltage of the bias circuit to adjust the phase of the lens unit, the lens unit generating a corresponding probe beam in accordance with a probe request based on its own phase.
8. The reconfigurable reflex lens antenna of claim 1, wherein a distance between the feed antenna and the reconfigurable lens is 2/3 times the far field distance of the feed antenna.
9. A method of detecting based on the reconfigurable reflective lens antenna of any of claims 1-8, the method comprising:
the feed source antenna radiates electromagnetic waves to the reconfigurable lens;
the controller controls a phase distribution of lens elements in the reconfigurable lens to generate a plurality of probe beams.
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