Browsing by Author "Abdalla, M.A"

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    Novel configuration of ultra-wide band uni-planar configuration of complementary split ring resonator composite right/left-handed based band pass filter with sharp roll off and good stopband attenuation
    (John Wiley and Sons Inc, 2020-11) Abdalla, M.A; Abdel Aziz, A.A; Arafa, G.b
    In this paper, a compact novel simple design of ultra-wide bandpass filter with high out of band attenuation is presented. The filter configuration is based on combining an ultra-wide band composite right/left-handed (CRLH) band pass filter (BPF) with simple uni-planar configuration of complementary split ring resonator (UP-CSRR). By integrating two UP-CSRR cells, the ultra-wideband CRLH filter roll-off and wide stopband attenuation are enhanced. The filter has 3 dB cutoff frequencies at 3.1 GHz and 10.6 GHz with insertion loss equals 0.7 dB in average and minimum and maximum values of 0.48 dB and 1.05 dB, respectively over the filter passband. Within the passband. The transition band attenuation from 3 dB to 20 dB is achieved within the frequency band 1.9 GHz to 3.1 GHz (48%) at lower cutoff and the frequency band 10.6 GHz to 11.4 GHz (7%) at upper stopband. Moreover, the filter has a wide stopband attenuation >20 dB in frequencies 11 GHz to 13.6 GHz (21%) and ends with 3 dB cutoff frequency at 14.8 GHz. Furthermore, the designed filter size is very compact (23 × 12 mm2) whose length is only about 0.17 λg at 6.85 GHz. The filter performance is examined using circuit modeling, full-wave simulations, and experimental measurements with good matching between all of them. © 2020 Wiley Periodicals LLC
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    Wideband slow phase loaded inductor-composite right/left-handed transmission line for compact UWB power divider
    (John Wiley and Sons Inc., 2020) El-Henawy, H; Abdalla, M.A; Daw, A.F
    This article introduces analysis of the new configuration; inductor loaded left-handed composite right-/left-handed transmission line ((L-CRLH TL). Compared to conventional CRLH and dual CRLH, this configuration has the advantage of very slow phase (almost constant) and nonlinear propagation coefficient which enables it to be very effective in designing compact size and ultra-wideband (UWB) microwave components. The theoretical and circuit model of the L-CRLH TL is discussed. As an application, a compact UWB (3.1-10.6 GHz) L-CRLH power divider is designed using only one L-CRLH cell with size of 2.7 × 8.6 mm2 whereas the whole power divider photoprint is 12.14 × 18.83 mm2. The size is 58.5% smaller compared to the conventional narrow band T-junction power divider designed at the mid frequency. The results reveal good insertion losses (3.2 ± 0.2 dB for both S21 and S31), and good return losses (better than 10 dB within the passband). © 2020 Wiley Periodicals, Inc.