Toward system modeling dedicated to frequency reconfigurable antennas

With the recent evolution of wireless systems such as cognitive radio, new antennas have to be developed to provide large bandwidth, compact size and especially adaptive parameters for changing environments. The antennas are become more again an essential part of wireless systems. They play a fundamental role both in the propagation and also at a system level. New antennas models must be developed being radically different from those currently available. The potential of linear invariant time models associated to parametric approaches to describe antennas is presented. Based on these approaches, a new method for modeling reconfigurable antennas is proposed.