title: Broadband and wide-angle RCS reduction using a 2-bit coding ultrathin metasurface at terahertz frequencies.
abstract: A novel broadband and wide-angle 2-bit coding metasurface for radar cross section (RCS) reduction is proposed and characterized at terahertz (THz) frequencies. The ultrathin metasurface is composed of four digital elements based on a metallic double cross line structure. The reflection phase difference of neighboring elements is approximately 90° over a broadband THz frequency. The mechanism of RCS reduction is achieved by optimizing the coding element sequences, which redirects the electromagnetic energies to all directions in broad frequencies. An RCS reduction of less than -10 dB bandwidth from 0.7 THz to 1.3 THz is achieved in the experimental and numerical simulations. The simulation results also show that broadband RCS reduction can be achieved at an incident angle below 60° for TE and TM polarizations under flat and curve coding metasurfaces. These results open a new approach to flexibly control THz waves and may offer widespread applications for novel THz devices.
authors.affiliation: School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China.|College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Lanju
authors.initials: L
authors.lastname: Liang
authors.affiliation: Center for Terahertz Waves, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Minggui
authors.initials: M
authors.lastname: Wei
authors.affiliation: School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China.|College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Yan
authors.affiliation: School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China.
authors.forename: Dequan
authors.initials: D
authors.lastname: Wei
authors.affiliation: Center for Terahertz Waves, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Dachuan
authors.initials: D
authors.lastname: Liang
authors.affiliation: Center for Terahertz Waves, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Jiaguang
authors.initials: J
authors.lastname: Han
authors.affiliation: College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Ding
authors.affiliation: School of Information Science and Engineering, University of Jinan, Jinan 250022, China.
authors.forename: GaoYa
authors.initials: G
authors.lastname: Zhang
authors.affiliation: College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yao