We focus our attention on the possibilities to control the beam radiated by antennas, which are initially omnidirectional using active metallic photonic band-gap materials (AMPBG). In fact, MPBG composed of continuous or discontinuous wires present different and interesting characteristics when they are used as antenna reflector or radome. Adding active components on wires allows to switch from continuous to discontinuous structures. Wires with active elements on can then be placed inside a structure, which shapes the beam radiated by a dipole antenna. Experimental results show that it allows to switch on/off the beam or to change its shape.Index Terms-FET, metallic photonic band-gap materials (MPBG), radiation patterns. I,
SUMMARYThis paper presents the application of an iterative method for fast computation of microstrip interdigital capacitor (IDC) and a quasi-lumped miniaturized "lter. The use of a 2D-FFT algorithm allows simpli"cations in the calculation process leading to accurate results obtained 20 times faster than in the conventional method cases.
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