The diesel particulate filter (DPF) has been used in the automobile industry for around a decade. As a key technology for emissions control the DPF design needs to be increasingly optimized to expand its function to deal with any emission to meet not only PM/NOx regulation but also CO2 targets through minimizing any fuel penalty. Cost is extremely important to deliver an effective after-treatment catalyst. . Aluminum titanate and cordierite-based material DPFs are very cost effective in part because their properties allow monolith-manufacturing. Furthermore, geometrical design of the DPF channel structure can contribute to multi-functionalization of the DPF to provide further advantages. Practically, square and asymmetric square-designed channel structures in DPF have been utilized on current after-treatment systems. Asymmetric hexagonal-designed channel technology has recently been shown to provide lower backpressure and higher ash-capacity for longer DPF lifetime usage. A key concept is to increase the specific surface area on inlet channel of a DPF for soot and ash-loading where asymmetric hexagonal channels can have 1.3 times higher surface area. For further functionalization of emissions control technology, a catalyst loading of SCR could be increased on the DPF substrate. Herein, a higher surface area of unique design named as microgear-shaped channel has been developed, and catalyst performance as well as filter substrate testing through the hot-gas bench system has been validated. Thanks to its higher specific surface of microgear design to contact soot particles more effectively, it was revealed that soot combustion could be improved. . In addition, HC and NO oxidation performance carried out on engine dyno testing showed higher conversion.