Abstract
A linear array of three half-wavelength dipoles above a metallic reflector is analyzed. The results are then compared with those of the same array above a different kind of metallic photonic bandgap materials. The aim is to find a structure which allows the greatest reduction of the grating lobes (GL). This reduction can be obtained either by a destructive interference in the direction of the grating lobes or by using propagation inside the MPBG, propagation of normal incidence only (main lobe), or in the GL directions only. Then, an MPBG is selected and is completely analyzed (plane wave response, the radiation pattern with just one dipole and with the array in different configurations). As one solution is based on the propagation of particular modes inside the MPBG, this solution can be enhanced by the use of an MPBG reflector on the other side. But this solution is not perfect since there are grating lobes in the E-plane due to the way the waves are guided in the MPBG. One last structure is presented in order to suppress this grating. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 32–41, 1998.
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