US 11,715,888 B1
Reconfigurable intelligent metasurface with adjustable 3-bit dual-polarization phases
Zhixiang Huang, Hefei (CN); Junjie Han, Hefei (CN); Guangshang Cheng, Hefei (CN); and Sixian Qian, Hefei (CN)
Assigned to ANHUI UNIVERSITY
Filed by Anhui University, Hefei (CN)
Filed on Nov. 18, 2022, as Appl. No. 17/990,628.
Claims priority of application No. 202210901916.9 (CN), filed on Jul. 29, 2022.
Int. Cl. H01Q 21/06 (2006.01); H01Q 9/04 (2006.01)
CPC H01Q 21/065 (2013.01) [H01Q 9/0414 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A reconfigurable intelligent metasurface with adjustable 3-bit dual-polarization phases, comprising a plurality of reconfigurable intelligent metasurface units with adjustable 3-bit dual-polarization phases, wherein:
each of the plurality of reconfigurable intelligent metasurface units with adjustable 3-bit dual-polarization phases includes:
a first layer including four fan-shaped metal patches and four Y-shaped metal patches symmetrical about a center, wherein each of the four Y-shaped metal patches is connected to a corresponding fan-shaped metal patch by a varactor; two of the varactors correspond to each other and are on the same straight line, and a remaining two of the varactors correspond to each other and are on the same straight line, a connection direction of each pair of the varactors is set as a rectangular-coordinate system by taking a center of the first layer as an origin, wherein a connection direction parallel to a side of the reconfigurable intelligent metasurface unit is taken as an x-axis, and a connection direction perpendicular to the x-axis is taken as a y-axis;
a second layer being a feeding layer along the x-axis direction;
a third layer being a feeding layer along the y-axis direction; and
a fourth layer being a metal ground layer;
the feeding layer along the x-axis direction is an octagonal metal feeding layer along the x-axis direction, and wherein four sides of the octagonal metal are parallel to coordinate axes;
a pair of rectangular metal bias wires with different lengths are provided in the second layer along the x-axis direction and the y-axis direction, respectively; wherein the rectangular metal bias wires along the x-axis direction control capacitance of the varactors in the x-axis direction, to independently control a reflection phase of an x-polarized electromagnetic wave;
the rectangular metal bias wires along the y-axis direction reduce asymmetry of a bias network;
the feeding layer along the y-axis direction is an octagonal metal feeding layer along the y-axis direction, and wherein four sides of the octagonal metal are parallel to coordinate axes;
a pair of rectangular metal bias wires with different lengths are provided in the third layer along the x-axis direction and the y-axis direction, respectively; wherein the rectangular metal bias wires along the y-axis direction control capacitance of the varactors in the y-axis direction, to independently control a reflection phase of a y-polarized electromagnetic wave; and
the rectangular metal bias wires along the x-axis reduce the asymmetry of the bias network;
a center of each of the four fan-shaped metal patches passes through the feeding layer along the x-axis direction, the feeding layer along the y-axis direction, and the metal ground layer via a metal through hole; and
by changing a voltage value at two ends of each of the varactors in an orthogonal polarization direction, the reconfigurable intelligent metasurface unit is enabled to independently implement dual-polarization 3-bit phase modulation in two orthogonal polarization directions, thereby implementing decoupling in the orthogonal polarization directions.