US 11,855,342 B2
Enhanced MIMO communication systems using reconfigurable metasurface antennas and method using same
Insang Yoo, Durham, NC (US); Seyedmohammadreza Faghih Imani, Durham, NC (US); Timothy Sleasman, Durham, NC (US); and David R. Smith, Durham, NC (US)
Assigned to Duke University, Durham, NC (US)
Filed by Duke University, Durham, NC (US)
Filed on Nov. 14, 2022, as Appl. No. 17/986,664.
Application 17/986,664 is a continuation of application No. 17/180,536, filed on Feb. 19, 2021, granted, now 11,502,396.
Application 17/180,536 is a continuation of application No. 16/138,783, filed on Sep. 21, 2018, granted, now 10,931,004, issued on Feb. 23, 2021.
Claims priority of provisional application 62/561,897, filed on Sep. 22, 2017.
Prior Publication US 2023/0143134 A1, May 11, 2023
Int. Cl. H01Q 1/36 (2006.01); H01Q 5/30 (2015.01); H01Q 21/00 (2006.01); H04B 7/0413 (2017.01); H01Q 21/06 (2006.01); H01Q 1/52 (2006.01); H01Q 15/00 (2006.01); H01Q 21/28 (2006.01); H01Q 25/00 (2006.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04B 7/10 (2017.01)
CPC H01Q 1/364 (2013.01) [H01Q 1/523 (2013.01); H01Q 5/30 (2015.01); H01Q 15/0086 (2013.01); H01Q 21/0025 (2013.01); H01Q 21/062 (2013.01); H01Q 21/28 (2013.01); H01Q 25/00 (2013.01); H04B 7/0413 (2013.01); H04B 7/0617 (2013.01); H04B 7/0837 (2013.01); H04B 7/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A MIMO communication system comprising:
a first antenna comprising a first cavity and a first plurality of sub-wavelength artificially structured material elements as arranged on a surface of the first cavity as RF radiators, wherein the first antenna is configured to generate a first plurality of radiation patterns;
a first plurality of RF ports for generating a feed wave within the first cavity; and
a second antenna comprising a second cavity and a second plurality of sub-wavelength artificially structured material elements arranged on a surface of the second cavity,
wherein at least one of the first cavity or the second cavity comprises an irregularity including at least one of a tunable impedance boundary or a plurality of conductive cylindrical posts along the surface of the first cavity or the second cavity.