Patent ID: 9711867
Date: 2017-07-18
CPC Classifications: H01Q

Claim:
1. A basic antenna designed to form a radiating element of an array antenna comprising: a probe for converting electricity into electromagnetic energy and electromagnetic energy into electricity; a planar electromagnetic wave reflector bearing the probe; and an assembly comprising a structure and a cavity, the cavity being an air cavity in contact with the planar reflector, the structure comprising two strips with same dimensions, made of Electromagnetic Band Gap materials having a periodicity in the direction orthogonal to the planar reflector, forming a planar cross positioned across from the probe through the cavity; and the probe being contained in the plane of the reflector in contact with the cavity or in the cavity in contact with the planar reflector, the cavity constituting a defect in the periodicity of the structure that imparts the assembly with a behavior of the Electromagnetic Band Gap material with a defect in which the positioning of the elements in said assembly ensures the radiation and a spatial and frequency filtering of electromagnetic waves produced or received by the probe, said filtering allowing one or more operating frequencies of the basic antenna inside a frequency band gap; wherein said basic antenna comprises a wall enclosure capable of reflecting the electromagnetic waves at the operating frequency or frequencies, the wall enclosure including four metal walls that delimit a rhomb having a height along the axis orthogonal to the planar reflector and a transverse section relative to that same axis with a square shape, said wall enclosure surrounding simultaneously and only the probe, the cavity and the structure, making it possible to generate a basic radiating surface with a shape predetermined and imposed by the wall enclosure, the height of the wall enclosure and of the cavity being substantially equal to half of the wavelength associated with the operating frequency of the basic antenna, and a length of one side of the wall enclosure and of each strip of the structure being substantially equal to the wavelength associated with the operating frequency of the basic antenna.