This　paper　presents　a　non-resonant,　compact,　and　high-gain　circularly　polarized　(CP)　partially　reflective　surface　(PRS)　antenna.　The　antenna　comprises　a　PRS　that　utilizes　linear-to-circular　polarization　conversion,　a　wideband　feed　antenna,　and　a　PEC　ground.　The　PRS　and　PEC　ground　form　a　non-resonant　cavity　that　produces　out-of-phase　leaky　waves　and　cannot　provide　the　expected　high　gain　performance.　To　overcome　this　limitation,　the　PRS　itself　provides　phase　compensation　that　ensures　the　out-of-phase　leaky　waves　become　in　phase　for　high　gain　performance.　Simulation　results　demonstrate　that　the　proposed　antenna　achieves　a　peak　gain　of　20.23　dBic,　a　3-dB　gain　bandwidth　of　14.8%,　a　3-dB　axial　ratio　(AR)　bandwidth　of　26.25%,　and　an　aperture　efficiency　of　34.11%.　©　2023　IEEE.