US Patent 10164342 Compact WiFi antenna with a metamaterial reflector

A compact antenna for centimetric frequency bands includes an active planar element forming a radiator, coupled to an input of a receiver circuit and/or to the output of an emitter circuit, and a passive planar element forming a reflector. The passive planar element is formed by a periodic structure of the metamaterial type comprising a network of resonating cells, in particular cells of the complementary concentric slit-ring type Complementary Split-Ring Resonator (CSRR). A clip-shaped support made of a dielectric material supports the active planar element and the passive planar element.