Design of inline sixth order single-layered SIW filter with cross couplings based on meandering electric coupling structure

An inline sixth order single-layered substrate integrated waveguide (SIW) filter with cross couplings is presented based on meandering electric coupling structure. Coupling coefficients and frequency variations with respect to the dimensions of meandering electric coupling structure are studied. The proposed inline sixth order filter with quasi-elliptic performance is designed and investigated by using coupling matrix method. The measured results show the 1-dB passband ranging from 9.12GHz to 9.76GHz, and the 3-dB passband from 9.06GHz to 9.82GHz with two transmission zeros locating at 8.81 GHz and 10.01GHz, respectively.