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In this notebook, condensed microstrip filters based on dual-mode resonator have been designed as bandpass and bandstop filters. They use quasi fractal resonator as slotted patch EM elements. The presented quasi fractal BPF has been designed for ISM band wireless application with hugely narrow fractional bandwidth of less than 1 %. On the other hand, quasi fractal BSF has been designed for single or multi narrow rejection band frequency responses that can be employed in broadband wireless systems sensitive to fixed frequency interferences for applications of ISM and C band wireless systems. Both microstrip filters have interesting compactness and satisfactory simulated S11 and S21 responses that are well matched with the measurements.

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Mezaal, Yaqeen Sabah
The corresponding author, Dr. Yaqeen S.Mezaal was born in Baghdad, Iraq, in 1985. He has received PhD degree from €ankaya University in Turkey. He is currently instructor in medical instrumentation Engineering Department in Al-Esraa University College. His research interests include wireless communication systems and microwave circuits design.

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