INFLUENCE OF METALLIC PHOTONIC BANDGAP (MPBG) MATERIALS INTERFACE ON DIPOLE RADIATION CHARACTERISTICS

The MPBG interface influence on half-wavelength dipole radiation chara cteristics-radiation pattern and input impedance-is analyzed. This stu dy concerns frequency operation within ol without an MPBG bandgap. A f irst analysis has been performed by replacing a wire of a 2-D square l attice MPBG by a dipole. Then, the study of dipole-MPBG distance is pr esented for different MPBG structures, and is compared to simple and g ridded corner reflector characteristics. This demonstrates that the in put impedance value can be controlled, and depends on the MPBG structu re dimensions and on the dipole position within this structure. It sho ws that some improvement of angular filter specifications can be obtai ned when the MPBG interface is no longer a plane. (C) 1998 John Wiley & Sons, Inc.