Design of a compact chip filter with two transmission zeros using 0.35 μm GaAs HBT. - Shanwen Hu; Kaikai Xu; Yunqing Hu; Kejun Wu; Jinchao Qian; Yiting Gao; Dingzhou Song; Zixuan Wang; Bo Zhou; Zhikuang Cai; Yufeng Guo (Microelectron. J., 2020)