Abstract: The present invention is to perform position estimation in relation to a vehicle and a key module by using an ultra-wideband (UWB) and, specifically, relates to a method and system for precise position estimation for a vehicle, whereby position can be estimated, with effects minimized that result from the type of the vehicle and the quality of exterior metal of the vehicle.

Abstract: The present invention relates to a waveguide comprising: a first body and a second body which are injected-molded, have metal-coated surfaces, and are connected in the up-down or left-right direction so as to form a transmission space in which radio waves can move in the longitudinal direction; and a first coupling surface and a second coupling surface which come into surface contact with each other when the first body and the second body are coupled, wherein the coupling surfaces are coupled through a coupling body, or by forming a bending structure in which protrusions and grooves formed on the coupling surfaces are engaged with each other.

Abstract: The present invention is to perform position estimation in relation to a vehicle and a key module by using an ultra-wideband (UWB) and, specifically, relates to a method and system for precise position estimation for a vehicle, whereby position can be estimated, with effects minimized that result from the type of the vehicle and the quality of exterior metal of the vehicle.

Abstract: A planar type magic tee includes a first coupling unit, a second coupling unit, and transmission lines for connecting the first coupling unit and the second coupling unit to each other in a cascading manner, the transmission lines having different characteristic impedances. The planar type magic tee is capable of solving the problem caused due to the intrinsic limitation in bandwidth of a conventional ring hybrid coupler.