This thesis tackles the design, manufacture and validation of multi-port and frequency reconfigurable antennas intended for advanced communications applications. The main accomplishments of this thesis are: Extension of the AMDSR© optimize package to efficiently deal with multiobjective and 3D structures. Broadband and nonlinear switch characterization. Study of novel planar multi-port antennas. Manufacturing of 3D antennas involving validation of a low cost material characterization technique at RF frequencies, techniques to control dielectric permittivity of 3D printed materials, and validation of alternatives for manufacturing 3D antennas. Design, validation, and manufacturing of a 3D pixellated antenna concept. Calculation of the curre...