Size Reduction in Microwave Passive circuits

pals, I am on the research of Size reduction in Passive circuits, working with all sizes of DGS, ans found the typical characteristics. In vain, I just designed LPF, BPF and Stepped impedence LPF (and compared with Return loss method too). And Now interested in new typical structures of DGS, which should possible reduce the size of UWB circuits. For me, I just want to know the peoples who are working with UWB and DGS concepts!1? I just want to mingle with those guys.