US 11,808,847 B2
Road identification system using enhanced cross-section targets
Nathan Cohen, Belmont, MA (US); and Philip Salkind, Boston, MA (US)
Assigned to Fractal Antenna Systems, Inc., Bedford, MA (US)
Filed by Fractal Antenna Systems, Inc., Bedford, MA (US)
Filed on Oct. 11, 2022, as Appl. No. 18/045,516.
Application 18/045,516 is a continuation of application No. 17/526,417, filed on Nov. 15, 2021, granted, now 11,467,279.
Application 17/526,417 is a continuation of application No. 17/157,145, filed on Jan. 25, 2021, granted, now 11,175,400, issued on Nov. 16, 2021.
Application 17/157,145 is a continuation of application No. 16/185,445, filed on Nov. 9, 2018, granted, now 10,901,082, issued on Jan. 26, 2021.
Claims priority of provisional application 62/618,165, filed on Jan. 17, 2018.
Claims priority of provisional application 62/593,636, filed on Dec. 1, 2017.
Claims priority of provisional application 62/583,740, filed on Nov. 9, 2017.
Prior Publication US 2023/0058690 A1, Feb. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 13/931 (2020.01); H01Q 15/00 (2006.01); G01S 7/41 (2006.01); H01Q 15/14 (2006.01); H01Q 1/36 (2006.01); H01Q 1/32 (2006.01); H01Q 1/22 (2006.01)
CPC G01S 13/931 (2013.01) [G01S 7/411 (2013.01); H01Q 1/2225 (2013.01); H01Q 1/3225 (2013.01); H01Q 1/3233 (2013.01); H01Q 1/3283 (2013.01); H01Q 1/36 (2013.01); H01Q 15/0086 (2013.01); H01Q 15/14 (2013.01); G01S 2013/9329 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A radar road reflector comprising:
a metasurface having a plurality of resonators, wherein the metasurface includes a conformal substrate that is conformable to a curvilinear surface and supporting the plurality of resonators, wherein the metasurface has an area, wherein the plurality of resonators support plasmonic transfer of incident radiation across the surface, and wherein the metasurface provides a radar cross section that is larger than a radar cross section of the area of substrate itself without the plurality of resonators;
wherein the conformable substrate is disposed on a vehicle.