Radiation characteristics of a half wavelength dipole inside metallic photonic band-gap structures

A progressive theoretical and experimental investigation is conducted through a moment method to characterize the radiation of half wavelength dipole inside MPBG structures. We present the radiation characteristics of a dipole positioned inside MPBG structures for which some wires have been suppressed to let the field propagate in privileged directions. These suppressed wires are then replaced by a new MPBG structure for which the field can propagate at the working frequency. The MPBG interface is structured to look like a corner reflector shape. The radiation characteristics versus frequency within a band-gap and versus reflector-dipole distances are presented and compared to simple and gridded corner reflector antenna characteristics. The same MPBC shape is analyzed outside bandgap, using propagation modes. Angular filtering characteristics can be improved when the MPBG interface is no longer a plane.