The　large-aperture　hoop　truss　antenna　is　considered　as　an　ideal　deployable　antenna,　whose　dynamic　performance　largely　limits　the　practical　application.　Extracting　a　reasonable　and　solvable　model　is　the　essential　prerequisite　and　foundation　for　analyzing　the　dynamic　characteristics　of　an　antenna.　In　this　paper,　a　folded　beam-ring　structure　composed　of　two　beams　and　one　ring　is　proposed　to　model　a　hoop　truss　antenna.　The　governing　equations　of　motion　and　boundary　conditions　for　the　folded　beam-ring　structure　are　derived　by　using　the　Hamilton　principle.　After　applying　the　method　of　separation　of　variables,　the　frequencies　and　global　mode　shapes　are　theoretically　calculated　by　solving　the　linear　parts　of　governing　equations　and　boundary　conditions.　The　reliability　of　dynamic　model　proposed　for　the　folded　beam-ring　structure　is　proven　by　comparison　of　frequencies　and　mode　shapes.　The　influences　of　geometrical　and　physical　parameters　on　natural　frequencies　of　folded　beam-ring　structures　are　analyzed.　The　parametric　rule　of　frequencies　is　important　for　analyzing　the　resonant　relations　of　the　structure.　The　analytical　global　mode　shapes　are　beneficial　for　constructing　precise　nonlinear　dynamic　model　for　the　antenna　system.　And　the　modeling　method　presented　here　can　be　used　as　a　reference　to　dynamic　analyses　of　other　complex　structures.　(C)　2022　Elsevier　Inc.　All　rights　reserved.