Patent ID: 8149180
Filing Date: 2012-04-03
Classification: H01P,H01Q

Abstract:
1. Antenna designed to emit or receive electromagnetic waves at a working frequency f T , this antenna including a first resonator ( 20 ; 60 ; 70 ; 80 ; 90 ; 122 ) formed of: a reflector ( a partly reflecting wall ( a cavity ( at least one excitation probe ( characterised in that the first resonator includes a filtering coating ( 40 ) which covers the majority of the upper face of the reflector within the cavity, this coating being suitable for eliminating all electromagnetic waves of frequency f T which are propagated in a parallel direction to the upper face of the reflector, but without eliminating all electromagnetic waves at frequency f T which are propagated in a perpendicular direction to the upper face of the reflector, and in that the filtering coating ( 40 ) forms a PBG (photonic band gap) material which includes at least a first and a second substance, which differ in their permittivity and/or permeability and/or conductivity, and are arranged alternately at regular intervals only along one or more parallel directions to the upper face of the reflector, the regular interval being a function of the wavelength λ 1 of the electromagnetic waves of frequency f T in the first substance, in such a way as to eliminate the electromagnetic waves of frequency f T which are propagated parallel to the upper face of the reflector.