Multibeam antenna with photonic bandgap material

Multi-antenna beam comprising: - a BIP (20, 142, 172) material Band Prohibition Photonics, capable of filtering spatial and frequencially electromagnetic waves, said the material BIP at least one band non-through and forming an outer surface ( 38; 158) radiant emission and / or reception - at least one defect (36, 76, 78, 156, 180) periodicity of the material BIP, so as to create at least a narrow passband within that at least one side not through said material BIP, - the or each defect (36, 76, 78) of periodicity material BIP forms a cavity (36, 76, 78) resonant with leakage, which has a constant height in a direction orthogonal to said radiating outer surface (38), and lateral dimensions determined parallel to said outer surface heating, and - one drive device (40 to 43, 84, 86, 160, 162, 190) capable of emitting and / or receiving electromagnetic waves inside said at least one narrow passband created by said at least one defect, characterized in that: the excitation device is capable of working simultaneously at least around a first and a second frequency different working; the excitation device includes a separate and independent first and second excitation element (40 to 43, 84, 86) from each other, each capable of emitting and / or receiving electromagnetic waves, the first excitation element capable of working the first working frequency and the second element being able to work excitation to the second operating frequency; the first and second working frequency capable of exciting the same resonance mode of a resonant cavity leaking (36, 76, 78), establishing said resonance mode identically whatever the lateral dimensions of the cavity, way to generate respectively said outer surface first and second radiant spot (46 to 49), representing each of said radiating patches the source of a beam of electromagnetic waves radiated in transmission and / or reception by the antenna; each of the radiant spots (46 to 49) has a geometric center the position of which depends on the position of the excitation which gives origin and whose surface is higher than the radiating element that gives rise, and the first and second excitation element (40 to 43, 84, 88) are positioned relative to one another such that the first and second radiant spot (46 to 49) are arranged on the outer surface (38) of material BIP, side to another and partly overlapping.