UWB Bandpass Filter with Improved Rejection Band Performance Using Defected Ground Structure and Slotted Step Impedance Resonator

This paper presents an ultra-wideband (UWB) bandpass filter witb high performances for sharp rejection bands and wide stopband. The filter is designed with the combination of defected ground structure (DGS) and slotted step impedance resonator (SSIR). Two transmission zeros for controlling the stop band can be generated designing with tbe defected ground structure utili7.ed as a stop band resonator. Also its structure can be designed for improving the sharp rejection band. The wider upper stopbands caused by slotted resonator characteristics have also been obtained. The simulated and experimented results esbibited in good agreement and high sharpened rejection stopbands shown at 2.90 GHz and 11.50 GHz. High stopband performances are better tban 15 dB in tbe frequency range up to 18 GHz