Miniaturised microstrip lowpass filter with sharp roll‐off and ultra‐wide stopband | Zendy

Karimi Gh. | Zendy; KhaminHamedani F. | Zendy; Siahkamari H. | Zendy

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

Author(s) -

Karimi Gh.,

KhaminHamedani F.,

Siahkamari H.

Publication year - 2013

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

eISSN - 1350-911X

pISSN - 0013-5194

DOI - 10.1049/el.2013.2321

Subject(s) - stopband , microstrip , low pass filter , filter (signal processing) , electronic engineering , materials science , elliptic filter , band pass filter , acoustics , electrical engineering , band stop filter , computer science , engineering , physics

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.

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