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The design and optimization of a novel compact and highly efficient power divider exhibiting dual-polarization in an in-phase scheme (4-way) is presented. The two fundamental orthogonal modes and arrive in-phase on each of the four square waveguides for each polarization by the utilization of four 3-port turnstile junctions accompanied by four E-plane and two H-plane power division structures. The power divider ends up to two commercial waveguide (WR75) ports (each for one polarization). The presented passive component can be used as a dual-polarized feeding network for a antenna array or any four-port radiating element with square input waveguides and aperture sizes above that are commonly targeted for focal array or direct radiating elements at GEO applications. The power divider is fully metallic, a fact that makes it an ideal candidate for satellite applications. The design band is Ku …