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The migration of telecommunication services and radar systems to Millimeter-wave (MMW) frequencies (30 to 300GHz) leads to the necessity of researching for alternative fabrication technologies and materials rather than the used for microwave frequencies. Part of this thesis work is focused in three MMW band applications such as Satellite Communication Systems (SCS) at Ka-band,Wireless Personal Area Network (WPAN) at V-band and Automotive Radar at W-band. In these applications, where the antenna is part of a mobile device, it is targeted the use of planar antennas because their low profile and...