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A switched beam antenna concept suitable for low-cost millimetre-wave applications is presented. The concept uses multiple travelling-wave patch arrays that together with the beam selection switches are realised on a single substrate, where the antenna and circuits are etched from the same metal layer. With its simple design and building practice, the concept provides good producibility at frequencies up to approximately 80 GHz. An experimental study is presented in which four-beam antennas for 24 GHz are built and measured.