REFLECTIONLESS LENS

摘要

The invention is a novel way of building electromagnetic lenses that enables us to match the lenses with free space and minimize the power losses due to reflections. The electromagnetic lens comprises transmission-line networks and a separate matching layer. The networks can be designed to have the characteristic impedance which equals to the free space wave impedance in a certain frequency band. The matching layer ensures the power transmission between free space and the network and thus minimizes the reflections from this new type of lens. The phase velocity of the electromagnetic wave traveling in the transmission-line networks can be varied by changing the design parameters of the network (cf. refractive index).