A microstrip lowpass filter with very sharp roll-off
and wide stopband is proposed in this paper. The structure
consists of tapered and triangular patches as the resonator and Pshaped
and U-shaped patches as suppressing cells. The proposed
filter has -3dB cutoff frequency at 1.64 GHz and it has also other
advantages such as: wide stopband bandwidth from 1.78 GHz to
22.46 GHz (for the insertion-loss more than -20 dB), sharp rolloff
of 203, low insertion-loss and high return-loss in the pass
band
