US 12,230,130 B2
System and method for vehicle traffic signaling
Mohammad Chavoshi, Kitchener (CA)
Assigned to Metra Sign Inc., Waterloo (CA)
Filed by Metra Sign Inc., Waterloo (CA)
Filed on Jan. 24, 2024, as Appl. No. 18/420,993.
Application 18/420,993 is a continuation of application No. PCT/CA2022/051172, filed on Jul. 29, 2022.
Claims priority of provisional application 63/227,715, filed on Jul. 30, 2021.
Prior Publication US 2024/0169829 A1, May 23, 2024
Int. Cl. G08G 1/07 (2006.01); G01S 13/91 (2006.01)
CPC G08G 1/07 (2013.01) [G01S 13/91 (2013.01)] 25 Claims
OG exemplary drawing
 
1. An electronic radar traffic sign comprising a plurality of metasurfaces to shape a reflector, each metasurface comprising:
a top layer of PCB board for controllable elements;
a ground layer of printed circuit board (PCB);
a biasing means in top or additional layer below the ground layer comprises at least one of a diode or a switch; and
at least one element attached to the top layer of PCB board, wherein each of the at least one element has at least two states and are controlled by a corresponding biasing means, the at least two states comprising a reflection state to reflect microwaves incident to the element and an absorption state to absorb at least a portion of the microwaves incident to the element;
wherein a bias voltage applied at the at least one biasing means causes the elements to change between the at least two states and an operation mode of the metasurface to switch.