Design, optimisation, fabrication and testing of antennas from VHF to millimetre wave, including microstrip implementations with different features: multiband, broadband, dual polarisation, etc. Waveguide Apertures: Millimetre and sub-millimetre wave diagonal horns, slotted waveguides, etc. Antenna Arrays: Microstrip and waveguide antenna array design. Individual element feeding for active antenna topologies. Series and parallel feeding networks for 1D/2D frequency scanning. Mutual coupling mitigation through DGS designs.