A novel compact CPW tunable stop band filter using a new Z-DGS-resonator for microwave applications

Elmahjouby Sghir, Ahmed Errkik, Jamal Zbitou, Larbi El abdellaoui, Abdelali Tajmouati, Mohamed Latrach


The paper presents a novel very compact CPW bandstop filter. The designed structure consists of one unit of new Z-DGS resonator, placed on top layer of ground plane between the input and output this structure, which is excited by 50 ohm coplanar line. The designed filter can be used in X-Band applications as the band stop can be shifted to any other desired frequency by tuning the length of the Z-DGS. The proposed  filter topology has as benefits good performances in terms of wide stop-band rejection, low insertion loss, high return loss, simple design and more small size (17.908 × 10 mm2) compared to other previous works those  reported in literature.  The stop-band width is from 3.96GHz to 6.21GHz, exhibits a 22,25 dB rejection bandwidth of  45% with high selectivity characteristic at the center frequency of  5.05 GHz.


defected ground structure (DGS); coplanar line; stopband filter; tunable stop stopband;

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DOI: http://dx.doi.org/10.12928/telkomnika.v17i5.12193

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TELKOMNIKA Telecommunication, Computing, Electronics and Control
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