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Miniaturised microstrip lowpass filter with sharp roll-off and ultra-wide stopband

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3 Author(s)
Karimi, G. ; Electr. Eng. Dept., Razi Univ., Kermanshah, Iran ; Khamin-Hamedani, F. ; Siahkamari, H.

A new semi-fractal technique is applied to hairpin microstrip lowpass filters to realise compact size and sharp roll-off. To achieve wide stopband suppression, both a semi-fractal hairpin resonator and a U-shaped resonator are employed in the filter. A demonstration filter with 3 dB cutoff frequency at 1.51 GHz has been designed, fabricated and measured. The results show that a roll-off of 217.6 dB/GHz with a relative stopband bandwidth of 159.7% (referred to a suppression degree of 32 dB) can be obtained while achieving a high figure-of-merit of 44 832.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 21 )