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A goal was to make phased arrays simpler and cost competitive for satellite communications. Accordingly, we employed a traveling wave array (TWA) using a single feedline whose propagation constant was controlled via a single, small mechanical movement of a dielectric plunger to enable scanning. The dielectric plunger is positioned within a parallel plate waveguide (PPW) transmission line (TL) that feeds the TWA. By adjusting the position of the dielectric plunger within the transmission line, the feedline achieved a propagation constant within the range of 1 ≤ 푘ef ≤ 2.1, corresponding to scan angles of −32.6° ≤ 휃 ≤ 34.2° and using an element spacing of 푑푑 = 0.65휆휆0. That is, beam steering was achieved using a single feed and one mechanical movement (for any size array), and thus, avoiding the usual and very costly phase shifters. Four different 20 element arrays were designed, demonstrating stable realized gain across −25° ≤ 휃 ≤ 25°. Additionally, a proof of concept array was fabricated and measured. The measured and simulated results were in agreement, validating the concept. The resulting dissertation was defended on 11-19-2014. 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