This　article　presents　a　balanced　tri-band　superconducting　band-pass　filter　(BPF)　with　controllable　center　frequencies　(CFs)　and　fractional　bandwidths　(FBWs)　using　novel　double　square　ring　loaded　resonators　(DSRLRs).　Due　to　the　symmetrical　structure　of　the　proposed　DSRLR,　the　differential　mode　(DM),　and　common　mode　(CM)　equivalent　circuits　of　the　resonator　are　analyzed　by　using　even-　and　odd-mode　methods,　and　the　resonant　characteristics　can　also　be　obtained.　With　the　proper　design　of　the　proposed　DSRLR,　the　first　three　DM　resonant　frequencies　are　utilized　to　construct　the　three　DM　passbands,　and　their　CFs　can　be　adjusted　by　changing　the　lengths　of　the　corresponding　stubs.　Then,　the　internal　coupling　between　resonators　can　be　controlled　independently　by　the　additional　capacitive　loading　microstrip　and　the　interdigital　coupling　structure.　In　addition,　the　so-called　frequency　dispersion　technique　is　used　to　enhance　CM　suppression　in　the　proposed　balanced　tri-band　BPF　by　loading　additional　multiple　stubs　on　the　symmetry　plane.　Consequently,　the　proposed　tri-band　BPF　can　realize　controllable　CFs　and　FBWs　with　broadband　CM　suppression.　Prototype　balanced　filters　with　CFs　of　1.7/2.45/3.4　GHz　and　FBWs　of　2.9%/3.2%/1.8%　were　designed,　manufactured,　and　measured　for　verification.　The　experimental　results　agree　well　with　the　simulated　ones.　©　2020　Wiley　Periodicals　LLC.