Dielectric　resonator　antenna　(DRA)　arrays　with　enhanced　isolation　and　front-to-back　ratio　(FBR)　are　proposed　in　this　letter.　Specifically,　each　DRA　element　is　mounted　on　a　small　and　separated　ground　plane;　all　the　DRA　elements　(with　small　ground　planes)　share　a　large　common　ground　plane.　Each　DRA　element　is　excited　by　two　differential　probes　at　its　edges.　The　DRA　element　in　its　TEδ11x　mode　is　equivalent　to　a　magnetic　dipole.　Meanwhile,　the　differential　probes　also　excite　electric　current　on　the　small　grounds　that　can　be　viewed　as　an　electric　dipole.　The　equivalent　magnetic　and　electric　dipoles　are　orthogonal,　behaving　like　a　magnetoelectric　dipole　(ME-dipole).　By　properly　adjusting　the　small　ground　planes＇　size　and　their　height　above　a　sizeable　common　ground　plane,　a　broadside　unidirectional　radiation　pattern　with　low　backward　radiation　is　realized;　moreover,　the　small　ground　structures　can　provide　neutralization　paths　to　counteract　the　original　coupling　waves.　A　1　×　4　single-polarized　DRA　array　is　designed,　fabricated,　and　measured.　Measurements　align　well　with　the　simulations,　demonstrating　significant　isolation　and　FBR　improvements　compared　with　the　conventional　DRA　array.　The　proposed　array　has　about　20%　relative　bandwidth.　©　2002-2011　IEEE.