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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Wan X,Qi MQ,Chen TY,Cui TJdoi
10.1038/srep20663subject
Has Abstractpub_date
2016-02-10 00:00:00pages
20663issn
2045-2322pii
srep20663journal_volume
6pub_type
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