Miniaturized high-harmonic-suppressed circulators with integrated design enabled by Cu2+/Ti4+ Co-doped NiCuZn ferrites (high-εr) and LTCC technology. - Cheng, Zelai; Huo, Xingyu; Zhao, Zhen; Qiao, Feng; Yang, Xiuling; Chen, Ying; Qu, Mingshan; Su, Hua (Ceramics International, 2025)