In　this　article,　a　new　class　of　high-order　balanced　dual-band　high-temperature　superconducting　(HTS)　bandpass　filter　(BPF)　based　on　modified　multimode　stub-loaded　resonators　(SLRs)　is　presented.　First,　a　detailed　theoretical　analysis　of　the　multimode　SLRs　is　provided　to　obtain　insight　into　their　frequency　response　characteristics　under　the　differential-mode　(DM)　and　common-mode　(CM)　operations.　Specifically,　the　SLRs　under　the　DM　operation　are　designed　to　generate　their　second　and　third　resonant　modes　in　the　two　specified　passbands,　and　they　are　sequentially　cascaded　by　alternate　J　and　K　inverters　for　sharp　rejection　skirts.　Following　that,　the　working　mechanism　of　the　CM　rejection　of　the　resonator　is　investigated　for　achieving　good　CM　suppression　performance　for　this　filter.　Finally,　for　experimental　validation,　an　eighth-order　prototype　filter　is　designed　and　fabricated　on　the　MgO　substrate　with　double-sided　YBa2Cu3Oy　(YBCO)　thin　films.　Good　agreement　between　measured　and　simulated　results　is　obtained,　and　the　filter　is　at　the　same　time　with　low　insertion　loss,　flexible　frequency　ratio,　sharp　rejection　skirts,　and　good　CM　suppression　level.　©　1963-2012　IEEE.