This　paper　presents　a　three-dimensional　microwave　metamaterial　absorber　based　on　the　stand-up　resistive　film　patch　array.　The　absorber　has　wideband　absorption,　lightweight,　and　polarization-independent　properties.　Our　design　comes　from　the　array　of　unidirectional　stand-up　resistive　film　patches　backed　by　a　metallic　plane,　which　can　excite　multiple　standing　wave　modes.　By　rolling　the　resistive　film　patches　as　a　square　enclosure,　we　obtain　the　polarization-independent　property.　Due　to　the　multiple　standing　wave　modes,　the　most　incident　energy　is　dissipated　by　the　resistive　film　patches,　and　thus,　the　ultra-wideband　absorption　can　be　achieved　by　overlapping　all　the　absorption　modes　at　different　frequencies.　Both　the　simulated　and　experimental　results　show　that　the　absorber　possesses　a　fractional　bandwidth　of　148.2%　with　the　absorption　above　90%　in　the　frequency　range　from　3.9　to　26.2　GHz.　Moreover,　the　proposed　absorber　is　extremely　lightweight.　The　areal　density　of　the　fabricated　sample　is　about　0.062　g/cm(2),　which　is　approximately　equivalent　to　that　of　eight　stacked　standard　A4　office　papers.　It　is　expected　that　our　proposed　absorber　may　find　potential　applications　such　as　electromagnetic　interference　and　stealth　technologies.　(C)　2015　AIP　Publishing　LLC.