What are active integrated antennas? Can successful CAD be achieved?

The potential applications for active integrated antennas are addressed. It is shown that active arrays constructed using monolithic integrated circuit techniques for application at millimetre and submillimetre wavelengths offer the most potential. The importance of having Computer Aided Design (CAD) facilities for active integrated antennas is explained, and the FDTD scheme is shown to be the method most likely to provide this need.