Dual-band bandpass filter based on stub-loaded complementary CMRC

A dual-band bandpass filter (BPF) is presented in this paper by applying the stub-loaded resonator technique to the recently-proposed quasi-lumped BPF, namely complementary CMRC (CCMRC). The CCMRC is a compact single-band BPF and consists of four resonators. Two stubs are attached at the center of the first and the fourth resonators respectively to obtain an additional passband, resulting in a dual-band filtering feature. The implemented dual-band BPF inherits advantages from the CCMRC, such as compact size, good passband performance and high selectivity skirt.