Design of Millimeter-Wave Bandpass Filter Using Edge-Coupling Dual-Mode Resonator

A novel millimeter-wave bandpass filter (BPF) based on 0.13-µm SiGe (Bi)-CMOS technology using edge-coupling dual-mode resonator is proposed for wideband filtering application. To understand the theory of the proposed resonator and BPF, a simple L-C equivalent circuit of resonator is established and analyzed in detail. Based on the calculation of L-C equivalent circuit, the transmission characteristics of the BPF can be flexibly adjusted by changing the geometric parameters of BPF layout. Two open stubs are also loaded in proposed BPF to obviously improve the stopband rejection.