Haiwen Liu, Chinese Academy of Sciences, Chengdu, China; Xiaohua Li, University of Electronic Science and Technology of China, Chengdu, China

Compared to traditional microstrip filters, the dual-mode patch resonator shows attractive features such as its sharp band rejection and compact size. In general, the dual-mode operation consists of two degenerate modes, which are excited by asymmetrical feed lines and some perturbation element(s) on the patch resonators. Moreover, in order...