This　paper　presents　an　orthogonal-mode　decoupling　antenna　pair　based　on　asymmetric　non-differential　feed　mode.　The　main　structure　of　the　proposed　antenna　pair　comprises　a　monopole　antenna　and　a　dipole　antenna,　placed　above　the　ground　plane.　Antenna　pairs　realize　decoupling　property　by　the　modal　orthogonality　of　these　two　independent　antenna　elements　without　additional　decoupling　components,　even　though　these　two　antenna　elements　share　the　same　space　in　the　same　location.　In　our　approach,　the　dipole　antenna　is　fed　by　a　coupling　branch　at　one　side　of　the　dipole　arm,　avoiding　the　differential　feed　scheme　at　both　sides　that　requires　a　balun　chip.　In　order　to　ensure　good　isolation　between　the　dipole　and　monopole　antennas　operating　in　the　same　frequency　band,　an　asymmetric　dipole　is　designed.　The　antenna　pair　shows　an　impendence　bandwidth　of　3.05-3.9　GHz　by　employing　the　orthogonal-mode　design　scheme,　the　maximum　isolation　across　the　target　frequency　band　can　reach　more　than　21　dB.　The　simulation　results　show　that　the　envelope　correlation　coefficient　between　two　antenna　ports　is　lower　than　0.03.　The　total　efficiencies　of　the　monopole　and　dipole　antennas　are　58%-90%　and　59%-89%　across　3.05-3.9　GHz,　respectively.　The　proposed　design　scheme　has　the　advantages　of　simple　feed,　high　integration,　and　simple　implementation,　so　it　has　potentials　for　5G　MIMO　applications.　©　2022　IEEE.