The　3D　quasi-spherical　focal　spot　and　optical　ring　may　find　potential　application　value　in　fields　like　arbitrarily　oriented　particle　capture　and　guidance,　super　resolution　microscopy　and　optical　capture.　On　the　basis　of　the　radiation　pattern　of　the　orthogonally　superimposed　dipoles　antenna　in　a　4Pi　focusing　system,　this　paper　firstly　proposes　an　approach　to　create　a　central　pure　circular　polarization　three-dimensional　(3D)　quasi-spherical　focal　spot　with　higher　longitudinal　resolution.　In　addition,　we　also　use　the　radiation　pattern　of　the　ring　array　antenna　composed　of　orthogonally　superimposed　dipoles　antenna　elements　to　flexibly　generate　a　pre-parameterizable　and　uniformly　distributed　optical　ring.　The　simulated　numerical　results　show　that　the　method　achieves　a　quasi-spherical　focal　spot　with　a　slightly　smaller　longitudinal　size　(~0.31λ)　than　the　transverse　size　(~0.41λ),　and　with　the　smallest　volume　(~0.0273λ3).　The　position,　radius,　ring　number　and　layer　number　of　the　constructed　optical　ring　can　be　adjusted　arbitrarily,　determined　by　the　parameters　of　the　ring　array　antenna.　©　2023　SPIE.