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  1. Flexible rose curve layout to control the bandwidth inUWB antennas with a dual-band notch response

    Article • IET Microwaves Antennas & Propagation, January 2018, the Institution of Engineering and Technology (the IET)

    Ousama Abu Safia, dr Khelifa Hettak

  2. Compact dual-band bandpass filters with stub resonating lines

    Article • Microwave and Optical Technology Letters, May 2017, Wiley

    dr Khelifa Hettak, Ousama Abu Safia