Publications Scientifiques
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Item Compact, low insertion loss and Ultra-Wide rejection bandwidth microstrip Low-Pass filter(2013) Challal, Mouloud; Boutejdar, Ahmed; Dehmas, Mokrane; Azrar, ArabItem Comparative study of three shapes of DGS pattern and design of compact microstrip low-pass and band-pass filters(2011) Challal, Mouloud; Labu, Frederick; Dehmas, Mokrane; Azrar, ArabIn this paper, three types of defected ground structure (DGS) units which are triangular-head (TH), rectangular-head (RH) and U-shape (US) are investigated and their characteristics are compared each other. Further, they are used in the design of low-pass filters (LPF) and band-pass filters (BPF) and the obtained performances are examined. The LPF employing RS-DGS geometry presents the advantages of compact size, low-insertion loss and wide stopband compared to the other filters. It provides a cutoff frequency at 2.5 GHz, a largest rejection band width of 20 dB from 2.98 to 8.76 GHz, a smallest transition region and a smallest sharpness response at the cutoff frequency. The BPF based on RS-DGS has the highest bandwidth (BW) of about 0.74 GHz and the lowest center frequency of 3.24 GHz whereas the other BPFs have BWs less than 0.7 GHzItem Compact microstrip low-pass filter design with ultra-wide reject band using a novel quarter-circle DGS shape(2012) Challal, Mouloud; Boutejdar, A.; Dehmas, Mokrane; Azrar, Arab; Omar, A.A novel quarter-circle defected ground structure shape is introduced in this paper to design and implement an ultra-wide reject band low-pass filter (LPF). Moreover, an equivalent circuit model (ECM) is presented. The proposed LPF has small size and, a low insertion loss and a return loss less than -20 dB. Also, a round -20 dB suppression level ranging from 4 GHz to more than 20 GHz is achieved. The simulated results obtained by ECM and full-wave EM show good agreement with the measured ones