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A millimeter-wave antenna directly fed by waveguide is proposed. The antenna has a simple dipole element fed by a microstrip-line (MSL) which is connected to a WR-15 waveguide via a wideband mode-transition. The antenna element and the feeding MSL are structured on a low-loss single-layered liquid crystal polymer (LCP) substrate. In order to connect the MSL to the WR-15 waveguide with a wideband operation,...