Browsing by Author "Hammad Y.T."

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    A Compact Band Stop Filter with Sharp StopBand Response using D-CRLH Configuration
    (Institute of Electrical and Electronics Engineers Inc., 2018) Hammad Y.T.; Abdalla M.A.; Daw A.F.; Electronics and Communications Department; MSA University; Giza; Egypt; Electronic Engineering Department; Military Technical College; Cairo; Egypt
    In this paper a sharp compact stopband filter is introduced based on unbalanced dual composite right left handed D-CRLH unit cell. The designed stop band can be used to suppress any undesired signals in WLAN frequencies. The filter works for applications in C-band, where the allocation receiving frequency of the standard C-band. The cutoff frequencies of the proposed filter are 3 GHz and 5 GHz. Moreover, the proposed filter has a very sharp stopband response. The filter size is only 0.329 ? g � 0.609? g where ? g is the guided wavelength at 4 GHz. � 2018 IEEE.
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    An ultra wide band filter with high selective dual notching
    (Institute of Electrical and Electronics Engineers Inc., 2017) Hammad Y.T.; Fouda Z.K.; Abdalla M.A.; Electrical Systems Engineering Department; October University for Modern Sciences and Arts; Giza; Egypt; Electronic Engineering Department; MTC College; Cairo; Egypt
    This paper introduces an ultra-wide band (UWB) band pass filter (BPF) with a coupled T-shaped stub. The filter's lower cut-off frequency and higher cut-off frequency are around 3.2 GHz and 9.7 GHz respectively. Moreover, the pass band exhibits two narrow notches at 5.9 GHz and 7.8 GHz which minimize the interference effects of the proposed filter with both the wireless local area network (WLAN) and SATCOM systems, respectively. The main pass band of the filter and the upper notch are implemented using a stepped impedance resonator, coupled with an inter-digital feeding line backed by defected ground structures (DGS) for coupling augmentation. The lower notch band is implemented using a stepped impedance stub that is grounded through a via hole at one end and coupled to the main filter form at the other end. The proposed filter features a small size of 0.443�1.534 ?g2. � 2017 IEEE.