This　paper　proposes　a　method　to　design　a　planar　firs-torder　loudspeaker　array　structure　for　global　active　noise　control.　Compared　with　the　traditional　spherical　loudspeaker　array,　the　planar　array　provides　a　practical　design　with　flexible　source　locations.　The　planar　array　is　capable　of　achieving　global　noise　control,　provided　that　the　loudspeakers　have　general　variable　first-order　responses　in　elevation.　On　x-y　plane,　we　use　spherical　harmonics　to　analyze　the　required　first-order　loudspeakers　consisting　of　monopole　and　tangential　dipole　components.　By　exploiting　the　properties　of　the　associated　Legendre　functions　and　its　derivative,　we　can　divide　the　primary　soundfield　into　even　harmonics　controlled　by　the　monopole　component,　and　odd　harmonics　controlled　by　the　dipole　component.　Through　the　appropriate　choice　of　radii　of　circles,　we　avoid　the　ill-conditioning　problem　of　matrix　inversion　and　derive　a　robust　solution　for　loudspeaker　weights　to　suppress　the　primary　noise　field.　Besides,　we　use　the　closely-located　monopole　pairs,　instead　of　the　ideal　general　first-order　loudspeakers,　to　design　an　alternative　planar　array　for　practical　implementation.　As　an　illustration,　we　use　several　simulation　examples　to　validate　the　performance　of　the　two　proposed　planar　loudspeaker　arrays.