Imaging system and imaging method based on phase-modulated active frequency selective surface
A frequency selective surface and phase modulation technology, applied in antennas, electromagnetic wave detection, electrical components, etc., can solve the problems of high power consumption and high cost, and achieve the effect of low power consumption, low hardware cost and rich application scenarios
Active Publication Date: 2022-06-21
ZHEJIANG UNIV
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[0003] Traditional microwave imaging systems use phased array or synthetic aperture radar for beam scanning imaging, which has high cost and high power consumption
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[0055] An implementation process of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0056] The specific implementation is as figure 1 As shown, the imaging area 6 is located on the xoy plane, the N active frequency selective surfaces are placed on a plane parallel to the imaging area, and the N / 2 transmitting antennas 4 and N / 2 receiving antennas 5 are respectively arranged opposite to the N / 2 After the 2 transmitting active frequency selective surfaces 2 and N / 2 receiving active frequency selective surfaces 3, a single active frequency selective surface contains Ns units. N / 2 transmitting antennas 4 transmit and irradiate electromagnetic waves fed from the output port of the transmitting power division network onto the transmitting active frequency selective surface 2. Before the electromagnetic waves pass through the transmitting active frequency selective surface 2, the All phase modulation units perfo...
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The invention discloses an imaging system and an imaging method based on a phase modulation active frequency selective surface. Including active frequency selective surface, transmitting and receiving antenna, phase control system, radio frequency transmitting and receiving system, transmitting and receiving power division network, wherein a single active frequency selective surface is a two-dimensional surface composed of independently programmable phase modulation units evenly spaced, The space-fed electromagnetic wave has a band-pass filter characteristic, and a varactor is added to perform random binary phase modulation on the phase of the space-fed electromagnetic wave. The invention is not only used for random modulation of the incident field generated by the transmitting antenna, but also random modulation of the scattered field generated by the imaging target, so as to realize the random irradiation of the imaging area and the random reception of scattered echoes, reducing the need for measurement in different random modes. The redundancy between them is beneficial to improve the imaging quality, and has the advantages of low hardware cost, high integration, simple operation, fast imaging, and expandable caliber.
Description
technical field [0001] The invention relates to an imaging system and an imaging method, in particular to an imaging system and an imaging method based on a phase modulation active frequency selective surface. Background technique [0002] Microwave, millimeter-wave, and terahertz imaging have been extensively studied over the past few decades, with application scenarios including security screening, medical imaging, geographic detection, through-wall imaging, and more. In recent years, with the increase of terrorist attacks, the demand for large-scale security inspection equipment in public places such as airports, stations, and shopping malls has continued to increase. Microwaves have good penetrability to clothing and will not cause harm to the human body, which is very suitable for in the security system. Researchers at home and abroad are also constantly exploring low-cost, high-resolution microwave security imaging systems. [0003] The traditional microwave imaging ...
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IPC IPC(8): H01Q15/00H01Q3/34G01V3/12
CPCH01Q15/002H01Q3/34G01V3/12
Inventor 张倩冉立新
Owner ZHEJIANG UNIV