2results about How to "High imaging performance" patented technology

The embodiment of the present disclosure discloses a flexible combined multifunctional broadband metasurface antenna for synthetic aperture radar, which comprises, from inside to outside, a core metasurface antenna located at the center and a peripheral metasurface located at the periphery, and the core metasurface antenna and the peripheral metasurface are connected through a U-shaped slot plug structure, wherein the core metasurface antenna and the peripheral metasurface can be replaced according to different application scenarios. The present disclosure has the characteristics of simple and reliable modular structure and flexible configuration according to task requirements; it meets the requirements of high-precision multiple transmission modes and corresponding amplitude-phase consistent multiple polarization reception of synthetic aperture radar, effectively increases the working bandwidth of the core antenna under low profile, reduces the radar scattering area of the antenna, optimizes the antenna radiation pattern and reduces the mutual coupling characteristics, further improves the imaging performance of the synthetic aperture radar, and reduces the signal-to-interference ratio of the synthetic aperture radar system.

This invention belongs to the field of biomedical materials technology, and relates to a signal probe that simultaneously possesses CT and MRI imaging capabilities, its preparation method, and its application. The preparation method includes the following steps: dissolving bismuth citrate and iron salt in water, adjusting the pH of the solution to <7, adding polyvinylpyrrolidone, then adding gallic acid, adjusting the pH of the mixed solution to >7, and after the reaction is complete, filtering through a membrane to remove impurities, dialysis, and drying to obtain bismuth-iron nanoparticles; mixing citric acid with the bismuth-iron nanoparticle solution, stirring and reacting to obtain citric acid-treated bismuth-iron nanoparticles; further activating to obtain an activated bismuth-iron nanoparticle solution; adding RGDfk and amino-terminated polyethylene glycol to the activated bismuth-iron nanoparticle solution, stirring and reacting in the dark, dialysis, and drying to obtain a signal probe that simultaneously possesses CT and MRI imaging capabilities. The signal probe prepared by this invention has a small particle size and simultaneously possesses CT and MRI imaging functions.