1. Frequency-Diverse Holographic Metasurface Antenna for Near-Field Microwave Computational Imaging
- Author
-
Jiaqi Han, Long Li, Shuncheng Tian, Xiangjin Ma, Qiang Feng, Haixia Liu, Yu Zhao, and Guisheng Liao
- Subjects
Physics ,Technology ,Mutual coherence ,business.industry ,Materials Science (miscellaneous) ,Holography ,Near and far field ,computational imaging ,law.invention ,Optics ,Compressed sensing ,Horn antenna ,frequency-diverse ,law ,near-field imaging ,Frequency domain ,Antenna (radio) ,business ,holographic metasurface ,Microwave ,compressed sensing - Abstract
This article presents a holographic metasurface antenna with stochastically distributed surface impedance, which produces randomly frequency-diverse radiation patterns. Low mutual coherence electric field patterns generated by the holographic metasurface antenna can cover the K-band from 18 to 26 GHz with 0.1 GHz intervals. By utilizing the frequency-diverse holographic metasurface (FDHM) antenna, we build a near-field microwave computational imaging system based on reflected signals in the frequency domain. A standard horn antenna is adopted to acquire frequency domain signals radiated from the proposed FDHM antenna. A detail imaging restoration process is presented, and the desired targets are correctly reconstructed using the 81 frequency-diverse patterns through full-wave simulation studies. Compressed sensing technique and iterative shrinkage/thresholding algorithms are applied for the imaging reconstruction. The achieved compressive ratio of this computational imaging system on the physical layer is 30:1.
- Published
- 2021