Decreasing the permittivity of a dielectric-loaded slotted waveguide antenna results in an increase in both impedance and radiation bandwidth, where the widest bandwidth can be achieved when the dielectric permittivity falls below unity. This concept is employed to resolve the inherently resonating nature of the SIW slot antenna. Employing two perpendicular slots, a dual-polarized antenna is proposed. This approach not only resolves cost and alignment challenges typically associated with multi-layer structures but also caters to the demand for broad-band dual-polarized antennas, making it a promising candidate for practical applications. A 16-element phased array antenna with wide beam steering angle capabilities has been proposed. Designing a Rotman Lens for each individual polarization and employing an appropriate feed network, a low-profile structure is designed. Simulations reveal an impressive beam steering range of up to ±50°, accompanied by a peak gain exceeding 18 dBi.