A simple linear-cross and linear-circular reflective polarizer is presented in this work. For a 45° linearly polarized EM wave incidence, this design exhibits linear-circular conversion with Axial Ratio (AR) ≤ 3dB from 20.01-21.83 GHz (RCP at K-band) and 28.66-50.14 GHz (LCP at Ka-band and V-band), with 8.70%, and 54.52% Fractional Bandwidth (FBW) respectively. It also results in linear-cross conversion with 90% Polarization Conversion Ratio (PCR) bandwidth from 23.09-26.33 GHz (K-band with 13.11% FBW). Multiple surface plasmonic resonances are responsible for this dual-polarization conversion. Surface current patterns of the top FSS and ground plane are investigated to get physical insight. The PCR and AR performance are stable up to 40° for Transverse Electric (TE) and Transverse Magnetic (TM) cases. The design is compact with a structural periodicity of 0.093 λL × 0.137 λL, and thickness of 0.053 λL. Here, λL corresponds to the lowest frequency's free-space wavelength of the operating range. The author firmly thinks that the miniaturized converter countervails Faraday's rotation experiences by Electromagnetic (EM) waves in satellite communication applications. © 2022 IEEE.