CN109167168B - MIMO antenna array, MIMO array antenna and security inspection system - Google Patents
MIMO antenna array, MIMO array antenna and security inspection system Download PDFInfo
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- 238000007689 inspection Methods 0.000 title claims abstract description 29
- 238000003491 array Methods 0.000 claims description 21
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- 238000003384 imaging method Methods 0.000 abstract description 30
- 238000000034 method Methods 0.000 abstract description 7
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The application provides a terahertz near field imaging-oriented MIMO antenna array, an MIMO array antenna and a security inspection system. The receiving antenna and the plurality of transmitting antennas are arranged on the same circular arc and are respectively and uniformly distributed. The receiving antenna and the plurality of transmitting antennas are arranged on the same circular arc, so that the distances from the receiving antenna to the circle center are equal to the distances from the plurality of transmitting antennas to the circle center. By using the principle of equivalent phase center, any combination of a pair of transmitting antennas and a pair of receiving antennas can be replaced by a transmitting antenna and a receiving antenna which are positioned at the centers of the transmitting antennas and the receiving antennas. The principle of equivalent phase centers can only be established under far-field conditions, and the approximation error under near-field conditions cannot be ignored. The MIMO antenna array corrects the method for designing the linear MIMO antenna array based on the equivalent phase center principle by utilizing the characteristic that the distances from any point on the circle to the circle center are equal, solves the problem that the conventional linear MIMO array designed based on the equivalent phase center principle has serious side-grid artifacts in near-field imaging, and improves the imaging quality.
Description
Technical Field
The application relates to the field of security inspection, in particular to a terahertz near field imaging-oriented MIMO antenna array, a MIMO array antenna and a security inspection system.
Background
The terahertz imaging technology is a technology for imaging by using high-frequency electromagnetic waves with a frequency band of 0.1-10 THz, and compared with the traditional X-ray imaging technology, infrared imaging technology and microwave imaging technology, the terahertz imaging technology has the advantages of good safety, strong penetrability, high image quality, certain substance identification capability and the like, so that more and more attention is paid. The Multiple-Input Multiple-Output (MIMO) imaging radar is a radar that uses Multiple combinations of transmit-receive antenna units to generate images with a small number of antennas, and has the characteristics of low cost and complexity, high data acquisition rate, and the like. The multi-receiving and multi-transmitting-based terahertz imaging technology integrates the advantages of terahertz imaging and multi-receiving and multi-transmitting imaging radar, has important application value in the fields of human body security inspection, medical diagnosis, military reconnaissance and the like, and particularly has natural advantages in the field of human body security inspection aiming at the inspection of forbidden articles.
Among them, array design is a very critical issue in imaging systems, which has direct or indirect effects on imaging quality, parameter estimation, target detection, etc. Reasonable array arrangement not only can obtain good imaging quality, but also can reduce the number of array elements and simplify the complexity of the system. The equivalent phase center principle cannot ignore approximate errors under the near field condition, and phase errors caused by delay errors are further increased to a terahertz frequency band along with the increase of signal frequency. Therefore, the linear MIMO antenna array designed based on the equivalent phase center principle at present has the problem of serious side-grating artifacts in near-field imaging, and the imaging quality is influenced.
Disclosure of Invention
Therefore, it is necessary to provide a MIMO antenna array, a MIMO array antenna and a security inspection system with smaller side-grating artifacts for terahertz near-field imaging, in order to solve the problem that the existing linear MIMO antenna array has serious side-grating artifacts in near-field imaging.
A MIMO antenna array includes a receive antenna subarray and a plurality of transmit antenna subarrays. The plurality of transmitting antenna subarrays are arranged at two ends of the receiving antenna subarray, and the receiving antenna subarrays and the plurality of transmitting antenna subarrays are arranged on the same circular arc.
In one embodiment, the receive antenna subarray comprises a plurality of receive antennas. The receiving antennas are arranged on the same circular arc, and the distance between the adjacent receiving antennas is equal.
In one embodiment, each of the transmit antenna subarrays comprises a plurality of transmit antennas. The transmitting antennas are arranged at two ends of the receiving antennas and are adjacent to each other, the distance between the transmitting antennas is equal, and the transmitting antennas and the receiving antennas are arranged on the same circular arc.
In one embodiment, the MIMO antenna array includes 2 transmit antenna sub-arrays, and the 2 transmit antenna sub-arrays are disposed at two ends of the receive antenna sub-array.
In one embodiment, each of the transmit antenna subarrays includes 5 transmit antennas, and the receive antenna subarrays includes a receive antenna.
In one embodiment, the operating frequency band of the receiving antenna subarray is at least partially the same as the operating frequency band of the plurality of transmitting antenna subarrays.
In one embodiment, a MIMO array antenna comprises a transceiver electrically connected to the MIMO antenna array, the transceiver configured to generate a transmit signal, an electronic switch configured to switch the plurality of transmit antennas and the plurality of receive antennas, and the MIMO antenna array of any of the above embodiments.
In one embodiment, a security system includes a plurality of security modules and a processing module. Each security check module comprises at least one MIMO array antenna as described in the above embodiments. The processing module is electrically connected with the output ends of the plurality of security inspection modules and used for processing the data detected by the plurality of security inspection modules.
In one embodiment, each security module further comprises a circular arc structure. At least one MIMO array antenna is nested in the circular arc structure.
In one embodiment, the MIMO array antenna is slidably connected to the arc structure to scan an object to be detected up and down.
The application provides a towards near field imaging's of terahertz MIMO antenna array, MIMO array antenna and security check system now, a plurality of transmitting antenna are based on the transmission signal transmission detected signal, receiving antenna receives the reflected signal to with reflected signal feedback to transceiver. The receiving antenna and the plurality of transmitting antennas are arranged on the same circular arc and are uniformly distributed. The receiving antenna and the plurality of transmitting antennas are arranged on the same circular arc, so that the distances from the receiving antenna to the circle center are equal to the distances from the plurality of transmitting antennas to the circle center.
Any pair of transmit and receive antennas can be replaced by a single co-located antenna centered between the two, in accordance with the equivalent phase-centering principle. The principle of equivalent phase centers can only be established under far-field conditions, and the approximation error under near-field conditions cannot be ignored. And along with the improvement of the signal frequency, the phase error caused by the time delay error is further increased to the terahertz frequency band. The MIMO antenna array corrects the method for designing the linear MIMO antenna array based on the equivalent phase center principle by utilizing the characteristic that the distances from any point on the circle to the circle center are equal, solves the problem that the conventional linear MIMO array based on the equivalent phase center principle has serious side-grid artifacts in near-field imaging, and improves the imaging quality.
Drawings
Fig. 1 is a schematic diagram of a MIMO antenna array structure provided in the present application;
fig. 2 is a schematic diagram of an equivalent single-receive single-transmit antenna formed by a transmitting antenna and a receiving antenna provided in the present application;
fig. 3 is a schematic diagram of a linear MIMO antenna array and its equivalent single-receive single-transmit array structure;
fig. 4 is a schematic diagram of a MIMO antenna array structure according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an equivalent array structure of a MIMO antenna array in an embodiment provided in the present application;
fig. 6 illustrates an exemplary MIMO antenna array and its equivalent array structure parameters;
fig. 7 is simulation parameters of a MIMO antenna array and its equivalent array structure in a terahertz band in an embodiment provided by the present application;
FIG. 8 is a point spread function of a MIMO antenna array and its equivalent array structure in a range of 330 GHz-350 GHz according to an embodiment of the present disclosure;
FIG. 9 is a graph illustrating point spread functions of a MIMO antenna array and a linear MIMO array in a range of 330GHz to 350GHz according to an embodiment of the present invention;
fig. 10 shows simulation parameters of a MIMO antenna array and a linear MIMO array in a millimeter wave band according to an embodiment of the present disclosure;
FIG. 11 is a graph illustrating point spread functions of a MIMO antenna array and a linear MIMO array in the range of 25GHz to 35GHz according to an embodiment of the present invention;
FIG. 12 is a graph illustrating point spread functions of a MIMO antenna array and a linear MIMO array in the range of 120 GHz-150 GHz according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a security inspection system provided in the present application.
Description of the reference numerals
The antenna system comprises a MIMO antenna array 10, a receiving antenna subarray 110, a transmitting antenna subarray 120, a receiving antenna 111, a transmitting antenna 121, a MIMO array antenna 20, a security check system 30, a security check module 310, a processing module 320, an arc structure 311, a detection object 40, a circle center 130, an equivalent antenna 50 and an equivalent antenna array 60.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by way of embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, a MIMO antenna array 10 includes a receiving antenna sub-array 110 and a plurality of transmitting antenna sub-arrays 120. The plurality of transmitting antenna sub-arrays 120 are disposed at both ends of the receiving antenna sub-array 110, and the receiving antenna sub-array 110 and the plurality of transmitting antenna sub-arrays 120 are disposed on the same circular arc.
The plurality of transmitting antenna sub-arrays 120 transmit detection signals based on the transmitting signals, and the receiving antenna sub-array 110 receives the reflection signals and feeds the reflection signals back to the transceiver. The receiving antenna subarrays 110 and the plurality of transmitting antenna subarrays 120 are disposed on the same circular arc and are uniformly distributed. The receiving antenna subarray 110 and the plurality of transmitting antenna subarrays 120 are disposed on the same circular arc, so that distances from the receiving antenna subarray 110 and the plurality of transmitting antenna subarrays 120 to the circle center 130 are equal.
Any pair of transmit and receive antennas can be replaced by a single antenna centered on the same transmit and receive antenna, according to the equivalent phase center principle. The principle of equivalent phase centers can only be established under far-field conditions, and the approximation error under near-field conditions cannot be ignored. And along with the improvement of the signal frequency, the phase error caused by the time delay error is further increased to the terahertz frequency band. The MIMO antenna array 10 corrects the method for designing the linear MIMO antenna array based on the equivalent phase center principle by utilizing the characteristic that the distances from any point on the circle to the circle center 130 are equal, solves the problem that the existing linear MIMO array based on the equivalent phase center principle has serious side-grid artifacts in near-field imaging, and improves the imaging quality.
In one embodiment, the receiving antenna subarray 110 includes a plurality of receiving antennas 111, where the plurality of receiving antennas 111 are disposed on the same circular arc, and the distances between adjacent receiving antennas 111 are equal.
In one embodiment, each of the transmit antenna subarrays 120 includes a plurality of transmit antennas 121. The plurality of transmitting antennas 121 are disposed at two ends of the plurality of receiving antennas 111, the distances between the adjacent transmitting antennas 121 are equal, and the plurality of transmitting antennas 121 and the plurality of receiving antennas 111 are disposed on the same circular arc.
The arc distance between the adjacent receiving antennas 111, the adjacent transmitting antennas 121, and the adjacent receiving antennas 111 and transmitting antennas 121 needs to satisfy that the arc length between the equivalent array antennas formed by the multiple receiving antennas 111 and the multiple transmitting antennas 121 is less than or equal to one half of the center wavelength λc. Wherein the central wavelength is lambdacIs the wavelength corresponding to the center frequency of the emitted broadband electromagnetic wave.
Referring to fig. 2, any pair of transmitting and receiving antennas can be replaced by a co-located antenna at the center of the two antennas according to the equivalent phase center principle. The method for designing the linear MIMO antenna array based on the equivalent phase center principle is modified by utilizing the characteristic that the distances from any point on the circle to the circle center 130 are equal. In a polar coordinate system (r, theta)T) The transmitting antennas 121 and (r, θ) ofR) The combination of the receiving antennas 111 at (r), (θ)T+θR) The equivalent antenna 50 at the same position of the transmitting and receiving at the position of/2) is replaced, and the time delay tau is caused by the equal distance from any point on the circle to the center 130 of the circleTR＝(rT+rR) 2rv/c will always hold. The corresponding MIMO array can be obtained by designing the arc-shaped equivalent single-receiving single-transmitting antenna array meeting the imaging requirement and then decomposing.
Therefore, the MIMO antenna array 10 has no approximation error, has a similar side-grating level to that of an equivalent single-receiving single-transmitting antenna array in a near field, corrects the method for designing a linear MIMO antenna array based on the equivalent phase center principle, solves the problem that the existing linear MIMO array based on the equivalent phase center principle has serious side-grating artifacts in near field imaging, and improves imaging quality.
In one embodiment, the MIMO antenna array 10 includes 2 of the transmit antenna sub-arrays 120. The 2 transmitting antenna sub-arrays 120 are disposed at two ends of the receiving antenna sub-array 110.
In one embodiment, each of the transmit antenna sub-arrays 120 includes 5 transmit antennas 121, and the receive antenna sub-array 110 includes 20 receive antennas 111.
The 2 transmitting antenna sub-arrays 120 are respectively disposed at two ends of the receiving antenna sub-array 110, each transmitting antenna sub-array 120 includes 5 transmitting antennas 121, and the receiving antenna sub-array 110 includes 20 receiving antennas 111. That is, 5 of the transmitting antennas 121 are disposed at one end of 20 of the receiving antennas 111, and 5 of the transmitting antennas 121 are disposed at the other end of 20 of the receiving antennas 111.
Referring to fig. 3-5, in one embodiment, the radiation source is selected in the terahertz band. Firstly, simulation tests are carried out on a linear MIMO array designed based on an equivalent phase principle and the MIMO antenna array 10, and two ten-transmission twenty-reception MIMO arrays are adopted simultaneously. The ten-transmission twenty-reception MIMO array refers to 10 of the transmitting antennas 121 and 20 of the receiving antennas 111, and every 5 of the transmitting antennas 121 are respectively disposed at two ends of the 20 receiving antennas 111.
Please refer to fig. 6 for a ten-transmit-two-receive MIMO antenna array and its equivalent array structure parameters, and fig. 7 for simulation parameters of the ten-transmit-two-receive MIMO antenna array and its equivalent array structure in the terahertz wave band.
Please refer to fig. 8, which shows the point spread function of the MIMO antenna array and its equivalent array in 330 GHz-350 GHz for the ten-transmit-twenty-receive MIMO antenna array and its equivalent array structure. Wherein the azimuth sampling range d is (-8 lambda)c,8λc)，λcThe center wavelength. From the simulation results shown in fig. 8, it is shown that in the near field imaging with the imaging distance of 0.1m, the MIMO antenna array 10 and the near field imaging method thereof are described in the present applicationPoint Spread Functions (PSFs) of the equivalent array are almost coincident, which verifies the consistency of the imaging performance of the MIMO antenna array 10 and the equivalent array thereof under the near-field condition.
Please refer to fig. 9, which shows the point spread function of the ten-transmit twenty-receive MIMO antenna array and the linear MIMO array in 330 GHz-350 GHz. As can be seen from fig. 9, under the near-field condition, the side-grating level of the MIMO antenna array 10 provided by the present application is significantly lower than that of a linear MIMO array designed based on the equivalent phase principle, and a simulation experiment verifies the effectiveness of the present application.
Referring to fig. 10-12, in one embodiment, the parameter settings are as shown in fig. 10, and the MIMO antenna array 10 and the linear MIMO antenna array of the present application are simulated and tested in the millimeter wave bands of 25-35GHz and 120-150 GHz. As can be seen from fig. 11 and 12, in the millimeter wave band, the grating level of the MIMO antenna array 10 is also significantly lower than that of a linear MIMO array designed based on the equivalent phase principle. Therefore, the MIMO antenna array 10 described herein has effectiveness in the millimeter wave band, and may be applied to other electromagnetic bands as well.
In one embodiment, the frequency band of operation of the receiving antenna sub-array 110 is at least partially the same as the frequency band of operation of the plurality of transmitting antenna sub-arrays 120.
In one embodiment, a MIMO array antenna 20 comprises a transceiver electrically connected to the MIMO antenna array 10, the transceiver configured to generate a transmit signal, an electronic switch configured to switch the plurality of transmit antennas and the plurality of receive antennas, and the MIMO antenna array 10 of any of the above embodiments.
The transceiver is used for realizing the interconversion of electromagnetic wave signals and electric signals, and the transceiver can be a millimeter wave transceiver or a terahertz transceiver and the like according to the frequency of a transmission signal. The transmitting antenna of the MIMO antenna array 10 transmits a detection signal based on the transmitting signal, and the receiving antenna is configured to receive the reflection signal and feed back the reflection signal to the transceiver.
In one embodiment, a security system 30 includes a plurality of security modules 310 and a processing module 320. Each of the security modules 310 includes at least one MIMO array antenna 20 as described in the above embodiments. The processing module 320 is electrically connected to the output ends of the plurality of security inspection modules 310, and is configured to process the data detected by the plurality of security inspection modules 310.
Each security inspection module 310 includes at least one MIMO array antenna 20 as described in the above embodiments, and is configured to propagate the electromagnetic wave signal emitted by the transceiver to the detection object 40, so as to implement detection scanning on the detection object 40. The MIMO array antenna 20 may adopt a linear array or an area array.
The processing module 320 may be various terminal devices with processing and computing functions, such as a server, a tablet personal computer, a desktop computer, a laptop PC, a netbook computer, a smart phone, or the like. The electromagnetic wave emitted by the emitting antenna 121 in the MIMO array antenna 20 is reflected by the detection object 40 to obtain a reflected signal, the reflected signal is received by the receiving antenna 111 and then converted into an electrical signal, and the received and transmitted signal is mixed and demodulated and then transmitted to the processing module 320. The processing module 320 may process the demodulated data to obtain a scanning profile of the detection object 40, so as to implement the detection of the detection object 40.
The security system 30 can be used for security inspection of the inspection object 40. The number of the security inspection modules 310 may be 1 or more. A plurality of the security modules 310 are disposed around the detection object 40 to detect the detection object 40 from different orientations. The terahertz wave has the characteristics of unique fingerprint spectrum, wide band, penetrability, high resolution and harmlessness, can be used for nondestructive testing, safety inspection and the like, and improves the safety of people going out.
In one embodiment, the MIMO array antenna 20 may be a cylindrical array antenna, so as to scan the detection object 40 in an omni-directional manner, and obtain information of the detection object 40 in a wider range.
In one embodiment, the security inspection system 30 includes two security inspection modules 310, and the two security inspection modules 310 are disposed opposite to each other, and the inspection object 40 is disposed between the two security inspection modules 310 and can be used for inspection.
In one embodiment, each of the security modules 310 further includes a circular arc structure 311, and at least one of the MIMO array antennas 20 is nested in the circular arc structure 311.
The MIMO array antenna 20 may be an arc array antenna, and is mounted on the arc structure 311 to form an arc with the detection object 40 as a center of circle, so that the detection object 40 can be scanned from various directions, and safety of people in travel is ensured.
In an embodiment, each of the security modules 310 may include a plurality of MIMO array antennas 20, and the plurality of MIMO array antennas 20 may be fixedly nested in the arc structure 311 to form an area array, so that the plurality of MIMO array antennas 20 may realize omni-directional scanning of the detection object 40 without sliding, thereby saving detection time of the security system 30, improving efficiency of the security system 30, and facilitating people to go out.
In one embodiment, the MIMO array antenna 20 is slidably connected to the circular arc structure 311 to implement up-and-down scanning of an object under test.
Through arc structure 311 with install a pulley between MIMO array antenna 20, just set up a sliding tray in the arc structure 311, can realize MIMO array antenna 20 is in slide from top to bottom in the arc structure 311, scan along the direction of height, thereby can be right detect the all-round scanning of object 40, wider acquisition detect the information of object 40, carry dangerous goods when avoiding people to go on a journey, harm social security.
In one embodiment, the security module 310 further includes a mixing unit and a demodulating unit. The frequency mixing unit is connected to the transceiver, and is used for obtaining a reference signal based on the frequency mixing of the transmitting signal and the local oscillator signal and obtaining a measuring signal based on the frequency mixing of the reflecting signal and the local oscillator signal. The demodulation unit is used for demodulating the reference signal and the measurement signal to obtain detection data.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A MIMO antenna array (10), comprising:
the receiving antenna subarray (110) comprises a plurality of receiving antennas (111), the receiving antennas (111) are arranged on the same circular arc, and the distances between the adjacent receiving antennas (111) are equal;
a plurality of transmitting antenna sub-arrays (120), wherein each transmitting antenna sub-array (120) comprises a plurality of transmitting antennas (121), the plurality of transmitting antenna sub-arrays (120) are arranged at two ends of the receiving antenna sub-array (110), the distances between adjacent transmitting antennas (121) are equal, and the plurality of transmitting antennas (121) and the plurality of receiving antennas (111) are arranged on the same circular arc;
the distances among the adjacent receiving antennas (111), the adjacent transmitting antennas (121) and the adjacent receiving antennas (111) and the adjacent transmitting antennas (121) meet the requirement that the length of an arc between equivalent array antennas formed by the plurality of receiving antennas (111) and the plurality of transmitting antennas (121) is less than or equal to one half of the center wavelength;
the arc interval L between the adjacent receiving antennas (111)1＝N1×L2Wherein N is1For each of said transmit antenna sub-arrays (120) the number of said transmit antennas (121), L2Is the arc spacing between adjacent transmitting antennas (121), L2λ c is less than or equal to λ c, and the central wavelength λ c is the wavelength corresponding to the central frequency of the broadband electromagnetic wave emitted by the emitting antenna (121);
the circular arc interval L between the adjacent transmitting antenna sub-arrays (120)3＝N2×L1Wherein N is2The number of the receiving antennas (111) between the adjacent transmitting antenna sub-arrays (120) is adopted.
2. The MIMO antenna array (10) of claim 1, wherein the MIMO antenna array (10) comprises 2 transmit antenna sub-arrays (120), the 2 transmit antenna sub-arrays (120) being disposed at opposite ends of the receive antenna sub-array (110).
3. The MIMO antenna array (10) of claim 2, wherein each of the transmit antenna sub-arrays (120) comprises 5 transmit antennas (121) and the receive antenna sub-array (110) comprises 20 receive antennas (111).
4. The MIMO antenna array (10) of claim 1, wherein the operating frequency band of the receive antenna sub-array (110) is at least partially the same as the operating frequency band of the plurality of transmit antenna sub-arrays (120).
5. A MIMO array antenna (20) comprising a MIMO antenna array (10) according to any of claims 1-4, a transceiver electrically connected to the MIMO antenna array (10), the transceiver being configured to generate a transmit signal, an electronic switch configured to switch the plurality of transmit antennas (121) and the plurality of receive antennas (111).
6. A security system (30), comprising:
a plurality of security modules (310), each of said security modules (310) comprising at least one MIMO array antenna (20) as set forth in claim 5;
the processing module (320) is electrically connected with the output ends of the plurality of security inspection modules (310) and is used for processing the data detected by the plurality of security inspection modules (310).
7. The security system (30) of claim 6, wherein each of the security modules (310) comprises:
an arc structure (311), at least one of the MIMO array antennas (20) being nested in the arc structure (311).
8. The security inspection system (30) of claim 7, wherein the MIMO array antenna (20) is slidably connected to the arc structure (311) for scanning an object under inspection up and down.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811004650.8A CN109167168B (en) | 2018-08-30 | 2018-08-30 | MIMO antenna array, MIMO array antenna and security inspection system |
| PCT/CN2018/114520 WO2020042363A1 (en) | 2018-08-30 | 2018-11-08 | Multiple-input and multiple-output antenna array, multiple-input and multiple-output array antenna, and security inspection system |
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| CN201811004650.8A CN109167168B (en) | 2018-08-30 | 2018-08-30 | MIMO antenna array, MIMO array antenna and security inspection system |
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| CN109167168B true CN109167168B (en) | 2020-10-16 |
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| CN110072184B (en) * | 2019-03-28 | 2021-01-05 | 天津大学 | Method for solving errors formed by terminal antenna differences in indoor positioning by fingerprint library method |
| CN111812642B (en) * | 2020-05-25 | 2022-11-11 | 北京理工大学 | Cylindrical aperture MIMO array antenna, imaging method and compensation method |
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| CN104269658B (en) * | 2014-10-21 | 2016-04-27 | 内蒙古工业大学 | For the arcuate array antenna of MIMO-SAR imaging |
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| US10511092B2 (en) * | 2015-10-27 | 2019-12-17 | Intel Corporation | Orbital angular momentum in millimeter-wave wireless communication |
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