Abstract: A method of designing a passive metasurface system within an environment includes receiving a three-dimensional model of the environment including one or more transmitter locations and one or more target locations, and determining one or more metasurface designs and placements to achieve a given objective. The method may also include computing a received signal strength at the one or more target locations based on the three-dimensional model of the environment, computing the received signal strength at the one or more target locations based on the three-dimensional model of the environment and the one or more metasurface designs and placements, and/or calculating ray traces and/or using machine learning to determine the received signal strength at the one or more target locations on the three-dimensional model of the environment and the one or more metasurface designs and placements.

Abstract: A steering wheel structure for an omnidirectional mobile robot chassis is provided. The steering wheel structure can realize two degrees of freedom: the rudder rotation of the steering wheel rotation and the full free movement realized in the horizontal plane, it has the characteristics of a small size and a lower height. The wheel assembly realizes the movement of the steering wheel when it moves forward; the rudder assembly realizes the movement of the steering wheel when the steering wheel rotates, initializes the steering direction, and calibrates the rotation through the zero position sensor; the suspension assembly realizes the damping and buffering of the longitudinal motion of the steering wheel; the wiring assembly constrains the movement of various wires when the rudder rotates; the support plate is used for the connection and support of the wheel assembly and the wiring assembly with the rudder assembly.

Abstract: A wheel structure with a built-in reducer and motor is provided. As the driving wheel in a rudder wheel, which has a high degree of integration and significantly reduces the overall height of the rudder wheel while maintaining high speed and acceleration. The wheel structure includes a wheel coupled to a reducer, a drive motor connected to the reducer, and the reducer.