Dual-Band Bandpass Filter using Defected Microstrip Structure (DMS) for WIMAX Applications

Mohamad Ariffin Mutalib, Zahriladha Zakaria, Noor Azwan Shairi, Sam Weng Yik, Yully Erwanti Masrukin, Mohd Khairy Zahari


This paper presents dual-band bandpass filter using defected microstrip structure (DMS). The two DMSs was integrated with short circuit stub bandpass filter to produce high attenuation and good selectivity between dual-bandpass. The DMS was designed at 3 GHz with a fractional bandwidth of about 20% and the attenuation is better than 70 dB. The group delay in the passband of dual-band was lower than 1.2 and 1.5 ns respectively. The design was simulated and fabricated on a Roger Duroid RO4350 with a thickness of 0.508 mm and dielectric constant, εr of 3.48. This type of filter is useful in any RF/microwave communication systems to enabling pre-selection of more than one band from interferers. While maintaining its excellent performance, the overall physical and cost reduction can also be achieved using this technique.


Microwave Filter; Bandpass; Dual-Band; Defected Microstrip Structure (DMS); Q-Factor;

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