Dual-mode L-band bandpass filter with cross couplings and absorbing resonators

This paper introduces dual-mode bandpass filter with cross couplings and absorbing resonators. The responses of six electrical resonators & two absorbing resonators and eight electrical resonators are simulated. It is shown that the cross coupling and absorbing resonator can improve the cutoffs at the edge of the passband evidently. An L-band filter composed of three physical cylindrical waveguide cavities and one absorbing cavity was made and tuned. The experimental result is in good agreement with the simulation.