In modern accelerator facilities, coherent synchrotron radiation (CSR) presents a fundamental limitation to maintaining high-brightness electron beam quality during deflection, with accurate modeling of its effects remaining an outstanding challenge. This study introduces a novel optimization method using an integral approach to suppress CSR-induced transverse emittance degradation, under two representative bunch scenarios: ultra-short bunches and high-charge long bunches. We present analytical solutions enabling complete CSR suppression in bending sections across various Quadruple Bend Achromats (QBA) topologies, and establish generalized conditions for mitigating CSR-driven emittance growth in sequential sections of isochronous structures. Our analysis demonstrates that the QBA comprises the minimal configuration achieving simultaneous suppression of transverse emittance degradation and preservation of longitudinal beam distribution. Beam tracking results show negligible emittance growth for multi-kiloampere bunches at a 16 degree deflection. Furthermore, multi-cell simulation confirms the exact scalability of this approach. While previous designs suffer severe emittance degradation upon cascading, the QBA maintains exceptionally preserved beam quality.