title: Field-programmable beam reconfiguring based on digitally-controlled coding metasurface.
abstract: Digital phase shifters have been applied in traditional phased array antennas to realize beam steering. However, the phase shifter deals with the phase of the induced current; hence, it has to be in the path of each element of the antenna array, making the phased array antennas very expensive. Metamaterials and/or metasurfaces enable the direct modulation of electromagnetic waves by designing subwavelength structures, which opens a new way to control the beam scanning. Here, we present a direct digital mechanism to control the scattered electromagnetic waves using coding metasurface, in which each unit cell loads a pin diode to produce binary coding states of "1" and "0". Through data lines, the instant communications are established between the coding metasurface and the internal memory of field-programmable gate arrays (FPGA). Thus, we realize the digital modulation of electromagnetic waves, from which we present the field-programmable reflective antenna with good measurement performance. The proposed mechanism and functional device have great application potential in new-concept radar and communication systems.
authors: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering Southeast University, Nanjing 210096, China.
authors: Xiang
authors: X
authors: Wan
authors: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering Southeast University, Nanjing 210096, China.
authors: Mei Qing
authors: MQ
authors: Qi
authors: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering Southeast University, Nanjing 210096, China.
authors: Tian Yi
authors: TY
authors: Chen
authors: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering Southeast University, Nanjing 210096, China.
authors: Tie Jun
authors: TJ
authors: Cui