A microwave antenna array system capable of matching imaging surfaces and with adjustable spatial accuracy

Abstract

The present invention belongs to the field of microwave diagnosis technology, and specifically relates to a microwave antenna array system that can match imaging surfaces and has adjustable spatial accuracy, and is composed of a plurality of array units and a mechanical sliding mechanism; the array unit includes a microwave antenna, a pre-microwave amplifier, a microwave mixer, an intermediate frequency amplifier, a local oscillator multiplier and an amplifier; the array unit is connected to the mechanical sliding mechanism through an antenna sliding sleeve, and the system can achieve matching of a detection surface and an imaging surface by adjusting the position and direction of each antenna without compensating an optical imaging system, thereby obtaining a clear imaging effect, and has the advantages of high flexibility and adjustable accuracy, and can improve detection efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave diagnosis, and in particular relates to a microwave antenna array system. Background Art

[0002] Microwave imaging has some unique advantages over diagnostic methods such as visible light imaging and infrared imaging. It can see through objects and can be used for detection of dense fog, tumors, disaster relief, and safety. In the study of magnetic confinement fusion plasma, microwave imaging is an important tool for studying the two-dimensional and three-dimensional turbulent structure of plasma. Its key component is the microwave antenna array system that can perform multi-spatial point or phase space measurements.

[0003] Since microwaves have a long wavelength and a wide range, from decimeter waves to millimeters to sub-millimeter waves, and the measurement area varies greatly, the imaging surface of the optical system cannot usually be designed to be on a plane within a wide parameter range. When the parameter range is narrow, the field curvature of the imaging surface is corrected through special design of the optical system, such as adding an auxiliary field curvature lens group to the optical system, so that it matches the detection surface of the microwave antenna system. However, when the parameters change, such as when the measurement area or operating frequency changes significantly, the field curvature of the imaging will become more serious, causing the imaging quality to deteriorate.

[0004] One way to solve this problem is to design a new optical system to adapt it to the new measurement conditions; another way is to add an auxiliary field curvature lens group in the optical path to correct the imaging surface of the optical imaging system. However, this method has very high requirements for early design and calibration, is very costly, and is not flexible in operation. In some cases, it is not easy to correct to the ideal effect. Summary of the invention

[0005] The purpose of the present invention is to provide a microwave antenna array system that can match imaging surfaces and has adjustable spatial accuracy. The position, angle and direction of each antenna can be adjusted, so that there is no need to compensate the optical system, and the imaging surface matching of the detection surface can be completed. It has high flexibility, adjustable spatial accuracy, and improved detection efficiency.

[0006] The technical solution of the present invention is as follows:

[0007] A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy, comprising a plurality of array units and a mechanical sliding mechanism;

[0008] The array unit includes a microwave antenna, a pre-microwave amplifier, a microwave mixer, an intermediate frequency amplifier, a local oscillator multiplier and an amplifier;

[0009] The horn output end of the microwave antenna is connected to the input end of the pre-microwave amplifier, the output end of the pre-microwave amplifier is connected to the radio frequency receiving end of the microwave mixer, the intermediate frequency output end of the microwave mixer is connected to the input end of the intermediate frequency amplifier, the output end of the local oscillator power amplifier is connected to the local oscillator input end of the microwave mixer, the output end of the local oscillator frequency multiplier is connected to the input end of the local oscillator power amplifier, the low-frequency local oscillator input signal is sent to the input end of the local oscillator frequency multiplier through the low-frequency local oscillator input end, and the output end of the intermediate frequency amplifier is connected to the intermediate frequency input end and then output.

[0010] The array unit is connected to the mechanical sliding mechanism through the antenna sliding shell.

[0011] The mechanical sliding mechanism includes an antenna outer frame, a vertical sliding frame capable of sliding in the vertical direction of the antenna outer frame, and a locking slide groove horizontally installed on the vertical sliding frame. The antenna sliding cover is connected to the locking slide groove, and the antenna sliding cover can slide along the locking slide groove and can rotate around the locking slide groove.

[0012] It also includes a locking mechanism. Screw holes are processed on the antenna sliding cover and the locking slot. After the locking mechanism passes through the locking slot, it is connected to the antenna sliding cover, so that the antenna sliding cover and the vertical sliding frame are relatively fixed to achieve locking.

[0013] The antenna sliding sleeve and the locking slide groove are processed into a thread matching structure, and relative movement and rotation are achieved through the thread.

[0014] The antenna sliding cover can slide along the locking slide groove in the vertical sliding frame, and the antenna sliding cover can be connected to the driving mechanism to drive it to rotate around the locking slide groove.

[0015] The microwave antenna, pre-microwave amplifier, microwave mixer intermediate frequency amplifier, local oscillator frequency multiplier and local oscillator amplifier are integrated in the antenna sliding casing.

[0016] The microwave antenna, pre-microwave amplifier and microwave mixer are integrated in the antenna sliding casing.

[0017] The microwave antenna is arranged in an antenna sliding casing, and a coaxial conversion waveguide is arranged at the output end of the microwave antenna.

[0018] The microwave antenna is an angular or conical horn antenna.

[0019] The locking mechanism is a screw or a bolt.

[0020] The remarkable effects of the present invention are as follows: the system is designed based on the antenna array for imaging the optical system, so that it is suitable for measurement conditions where the imaging surface is non-planar or the imaging surface changes frequently.

[0021] Currently, the imaging position of the target is usually located during the design of the optical system, which is not applicable to situations where the image plane position and shape change, resulting in a mismatch with the detection position. The technology of the three-dimensional mobile detection antenna provided by this system can achieve matching of the detection surface and the imaging surface by adjusting the position and direction of each antenna without compensating the optical imaging system, thereby obtaining a clear imaging effect. The present invention can be applied to the matching of detection array surfaces when the imaging surface is non-planar or the imaging surface changes frequently. Compared with the prior art, it has the advantages of high flexibility and adjustable precision, and can improve detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a microwave antenna array system that can match the imaging surface and has adjustable spatial accuracy and its position with the optical imaging system;

[0023] Figure 2 It is a schematic diagram of the connection between the array unit and the locking slide;

[0024] Figure 3 A schematic diagram showing the locking of the antenna sliding cover and the vertical sliding frame through a locking mechanism;

[0025] In the figure: 1. Optical imaging system; 2. Integrated microwave antenna; 3. Pre-microwave amplifier; 4. Microwave mixer; 5. Intermediate frequency amplifier; 6. Intermediate frequency output terminal; 7. Low frequency local oscillator input terminal; 8. Local oscillator multiplier; 9. Local oscillator power amplifier; 10. Antenna sliding cover; 11. Ideal image plane; 12. Actual imaging plane; 13. Locking slide groove; 14. Vertical sliding frame; 15. Antenna outer frame; 16. Locking mechanism. DETAILED DESCRIPTION

[0026] The present invention will be further described below through the accompanying drawings and specific implementation methods.

[0027] The optical imaging system 1 images the target to be measured on the designed microwave antenna array system, which is composed of multiple array units and a mechanical sliding mechanism. In this embodiment, 9 array units are shown in the figure.

[0028] like Figure 1 As shown, the ideal image plane 11 is a designed image plane for a certain parameter, and the actual imaging plane 12 is formed on a curved surface due to the spherical aberration or chromatic aberration of the optical imaging system 1. The microwave antenna 2 in each array unit is arranged on the actual imaging plane 12 through a mechanical sliding mechanism.

[0029] The mechanical sliding mechanism comprises an antenna outer frame 15 , a vertical sliding frame 14 that slides in the vertical direction of the antenna outer frame 15 , and a locking sliding groove 13 installed on the vertical sliding frame 14 .

[0030] like Figure 1 and Figure 2 As shown, each array unit includes a microwave antenna 2, a pre-microwave amplifier 3, a microwave mixer 4, an intermediate frequency amplifier 5, a local oscillator multiplier 8 and an amplifier 9 integrated in an antenna sliding housing 10. The locking slide groove 13 is connected to the end of the antenna sliding housing 10, and the microwave antenna 2 is installed through the antenna sliding housing 10. The antenna sliding housing 10 can slide along the locking slide groove 13 and rotate around the locking slide groove 13.

[0031] like Figure 3 As shown, the locking slot 13 is installed on the vertical sliding frame 14, and the locking slot 13 is located in the middle of the vertical sliding frame 14. After passing through the locking slot 13, the locking mechanism 16 is connected with the screw hole in the middle of the antenna sliding cover 10, so that the antenna sliding cover 10 is relatively fixed to the vertical sliding frame 14. The screw hole in the middle of the antenna sliding cover 10 needs to match the locking mechanism 16.

[0032] When the locking mechanism 16 is not tightened, the antenna sliding cover 10 can slide along the locking groove 13 in the vertical sliding frame 14. At the same time, the antenna sliding cover 10 can be connected to a driving mechanism to drive it to rotate around the locking groove 13. Of course, the antenna sliding cover 10 and the locking groove 13 can also be processed into a threaded matching structure to achieve relative movement and rotation through the thread.

[0033] When the direction and position of the antenna sliding cover 10 are at the designated position, the locking mechanism 16 continues to be screwed along the screw hole to lock the antenna sliding cover 10 to prevent it from further rotating and sliding.

[0034] The antenna sliding cover 10 is fixed on the locking slide groove 13 through the locking mechanism 16, so that the array unit inside it can move up and down following the vertical sliding frame 14, and is fixed on the antenna outer frame 15 after adjustment.

[0035] The locking mechanism 16 can be a screw or a bolt, and its size can match the screw hole.

[0036] The connection method and working process of the array unit are as follows:

[0037] The horn output end of the microwave antenna 2 is connected to the input end of the pre-microwave amplifier 3, the output end of the pre-microwave amplifier 3 is connected to the RF receiving end of the microwave mixer 4, the intermediate frequency output end of the microwave mixer 4 is connected to the input end of the intermediate frequency amplifier 5, the output end of the local oscillator power amplifier 9 is connected to the local oscillator input end of the microwave mixer 4, the output end of the local oscillator frequency multiplier 8 is connected to the input end of the local oscillator power amplifier 9, the low-frequency local oscillator input signal is sent to the input end of the local oscillator frequency multiplier 8 through the low-frequency local oscillator input end 7, and the output end of the intermediate frequency amplifier 5 is connected to the intermediate frequency input end 6 and then output.

[0038] When the microwave antenna 2 is not spatially arranged to accommodate the microwave antenna 2, the pre-microwave amplifier 3, the microwave mixer 4, the intermediate frequency amplifier 5, the local oscillator frequency multiplier 8 and the amplifier 9, or when the back-end circuit does not need to be integrated into one body, some or all of the components can be separated, such as the intermediate frequency amplifier 5, the local oscillator frequency multiplier 8 and the local oscillator amplifier 9 are separated into separate modules. When all components are separated from the microwave antenna 2, a waveguide coaxial conversion can be added to the output end of the microwave antenna 2, and the microwave antenna 2 is connected to the independent module at the back end through a radio frequency coaxial transmission line.

[0039] The microwave antenna 2 may be an angular or conical horn antenna, or other types of microwave antennas such as microstrip antennas. Parameters such as antenna shape, size and gain are determined by the measurement parameters and required indicators of the system.

[0040] The ideal image plane 11 is a design image plane for a certain parameter, and the actual imaging plane 12 is formed on a curved surface by the spherical aberration or chromatic aberration of the optical imaging system 1. The antenna array is arranged on the actual imaging plane 12 through the locking mechanism 16, the locking slide 13 and the vertical sliding frame 14. The optical imaging system 1 images the target on the actual imaging plane 12, and the antenna array frame 15 is arranged in front of the actual imaging plane 12. By adjusting the locking mechanism 16, the locking slide 13 and the vertical sliding frame 14, all microwave antennas 1 are arranged on the actual imaging plane 12. The vertical sliding frame 14 is used to adjust the spacing between adjacent microwave antennas 1, that is, the spatial resolution of antenna measurement. The antenna sliding cover 10 can slide in the direction of wave propagation and rotate around the locking slide 13 to adjust the measurement direction of the antenna, which is used to adjust the clarity of the imaging.

[0041] The locking mechanism 16, the locking slot 13 and the vertical sliding frame 14 work together to adjust the arrangement of the microwave antenna array in three dimensions, so as to match the detection antenna array with the actual imaging surface 12. During the actual adjustment, the best matching position is determined by monitoring the amplitude of the intermediate frequency signal.

[0042] The present invention is described in detail above with reference to the accompanying drawings and implementations, but the present invention is not limited to the above-mentioned implementation examples. Within the knowledge of ordinary technicians in the field, various changes can be made without departing from the purpose of the present invention, and various changes, modifications, substitutions and variations of these implementations still fall within the scope of protection of this patent.

Claims

1. A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy, characterized in that: It is composed of multiple array units and mechanical sliding mechanisms; The array unit comprises a microwave antenna (2), a pre-microwave amplifier (3), a microwave mixer (4), an intermediate frequency amplifier (5), a local oscillator multiplier (8) and an amplifier (9); The speaker output end of the microwave antenna (2) is connected to the input end of the pre-microwave amplifier (3), the output end of the pre-microwave amplifier (3) is connected to the radio frequency receiving end of the microwave mixer (4), the intermediate frequency output end of the microwave mixer (4) is connected to the input end of the intermediate frequency amplifier (5), the output end of the local oscillator power amplifier (9) is connected to the local oscillator input end of the microwave mixer (4), the output end of the local oscillator frequency multiplier (8) is connected to the input end of the local oscillator power amplifier (9), the low-frequency local oscillator input signal is sent to the input end of the local oscillator frequency multiplier (8) through the low-frequency local oscillator input end (7), and the output end of the intermediate frequency amplifier (5) is connected to the intermediate frequency input end (6) and then output; The array unit is connected to the mechanical sliding mechanism via an antenna sliding casing (10).

2. A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 1, characterized in that: The mechanical sliding mechanism comprises an antenna outer frame (15), a vertical sliding frame (14) capable of sliding the antenna outer frame (15) in a vertical direction, and a locking slide groove (13) horizontally mounted on the vertical sliding frame (14); the antenna sliding cover (10) is connected to the locking slide groove (13); the antenna sliding cover (10) can slide along the locking slide groove (13) and can rotate around the locking slide groove (13).

3. A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 2, characterized in that: The invention also comprises a locking mechanism (16). The antenna sliding cover (10) and the locking slide groove (13) are provided with screw holes. After the locking mechanism (16) passes through the locking slide groove (13), it is connected with the antenna sliding cover (10), so that the antenna sliding cover (10) and the vertical sliding frame (14) are relatively fixed to achieve locking.

4. A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 2, characterized in that: The antenna sliding housing (10) and the locking sliding groove (13) are processed into a thread matching structure, and relative movement and rotation are achieved through the thread.

5. The microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 2, characterized in that: The antenna sliding cover (10) can slide along the locking slide groove (13) in the vertical sliding frame (14), and the antenna sliding cover (10) can be connected to a driving mechanism to drive it to rotate around the locking slide groove (13).

6. The microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 1, characterized in that: The microwave antenna (2), the pre-microwave amplifier (3), the microwave mixer (4), the intermediate frequency amplifier (5), the local oscillator frequency multiplier (8) and the local oscillator amplifier (9) are integrated in the antenna sliding casing (10).

7. The microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 1, characterized in that: The microwave antenna (2), the pre-microwave amplifier (3), and the microwave mixer (4) are integrated in the antenna sliding casing (10).

8. The microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 1, characterized in that: The microwave antenna (2) is arranged in an antenna sliding casing (10), and a coaxial conversion waveguide is arranged at the output end of the microwave antenna (2).

9. A microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in any one of claims 1 to 8, characterized in that: The microwave antenna (2) is an angular or conical horn antenna.

10. The microwave antenna array system capable of matching an imaging curved surface and having adjustable spatial accuracy as claimed in claim 3, characterized in that: The locking mechanism (16) is a screw or a bolt.

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