Patent ID: 9246225
Filing Date: 2016-01-26
CPC Classification: H01P,H01Q

Claim Text:
1. An aperture antenna, comprising: a receiving element, which includes an aperture and is configured to receive, through the aperture, radio signals having frequencies within a given band of radio frequencies; a waveguide, which is configured to receive radio signals from the receiving element; and a frequency selective structure, which is arranged between the receiving element and the waveguide, and is configured to cause the propagation, from the receiving element to the waveguide, of only the received radio signals that have frequencies comprised within a predetermined sub-band of the given band of radio frequencies; wherein the frequency selective structure comprises: a metal wall that is arranged between the receiving element and the waveguide in a junction region, the metal wall being configured to reflect back into the receiving element the received radio signals that have frequencies not comprised in the predetermined sub-band; a slit that is located in the metal wall, the metal wall extending in a direction perpendicular to the direction of propagation of the received radio in the junction region such that received radio signals are propagated through the slit; and metamaterial structures that pass through the slit and that extend partially inside the receiving element or partially inside the waveguide.