High-power　fiber　lasers　have　experienced　a　dramatic　development　over　the　last　decade.　Further　increasing　the　output　power　needs　an　upscaling　of　the　fiber　mode　area,　while　maintaining　a　single-mode　output.　Here,　we　propose　an　all-solid　anti-resonant　fiber　(ARF)　structure,　which　ensures　single-mode　operation　in　broadband　by　resonantly　coupling　higher-order　modes　into　the　cladding.　A　series　of　fibers　with　core　sizes　ranging　from　40　to　100　mu　m　are　proposed　exhibiting　maximum　mode　area　exceeding　5000　mu　m(2).　Numerical　simulations　show　this　resonant　coupling　scheme　provides　a　higher-order　mode　(mainly　TE01,　TM01,　and　HE21)　suppression　ratio　of　more　than　20　dB,　while　keeping　the　fundamental　mode　loss　lower　than　1　dB/m.　The　proposed　structure　also　exhibits　high　tolerance　for　core　index　depression.