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This letter presents a compact wideband sequential-phase (SP) feed for use in sequentially rotated antenna arrays. The SP network is designed to match a 50-Ω coaxial line. The phase difference (out-of-phase) between the outer and inner conductors of the coaxial line is utilized as a 180° phase shifter; consequently, the desired phases at the outputs and a wideband operation are achieved. For a compact...
This paper presents a planar 2 × 2 dipole array in a square contour fed by a wideband sequential-phase network. The array, with an overall size of 80 mm × 80 mm × 1 mm, resulted in a |S11| <−10 dB bandwidth of 1.35–1.85 GHz (31.25%) and a 3-dB AR bandwidth of 1.51–1.87 GHz (21.3%). The array radiated a bi-directional electromagnetic wave with a gain excess of 3.5 dBic for both broadside and backside...
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