Compact UWB BPF with DNBs Using Interdigital Strips Imposed Inside the Rectangular Slots

In this paper offers a double notch bands (DNBs) ultra-wide band bandpass filter (UWB BPF) with low insertion loss and great harmonic out-of-band suppression upon a very wideband. The filter consists of a improved highpass filter (HPF) for obtain wide bandpass characteristic combined with defected ground structures (DGSs) as elliptical lowpass filter (LPF), which is able to suppressing higher order harmonics of the HPF upon a wideband. The suggested filter has double steeply rejected notch-bands at 5.60 and 8.10 GHz in the passband by cutting rectangular slots with imposed interdigital strips inside the slots in the main transmission line (TL) with attenuation level greater than 20 dB at the center of each notched band.

کلیدواژه ها:

Double notch bands (DNBs) ، elliptical lowpass filter (LPF) ، interdigital strip ، ultra-wideband bandpass filter (UWB BPF)