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The growing interest in the use of millimetre wavelengths for radar and communication systems stems principally from military requirements. Conventional component technology utilizing waveguides continues to feature but strenuous efforts are being made to devise new fabrication methods that lend themselves to further miniaturization, integration and cost saving. There is also a demand for a new generation of antenna types and this paper critically examines the progress made on planar antenna arrays using dielectric guides and substrate technology. Conclusions are reached on the feasibility of satisfying current system demands based throughout on published literature. It is conjectured that although the new planar devices have many performanceshortcomings compared to conventional antennas, cost, weight and size advantages are significant and could in some cases bring new system concepts for submunition systems.