Browsing by Author "Daw A.F."

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B6. Multiband sharp-skirt compact gap resonator based D-CRLH
(Institute of Electrical and Electronics Engineers Inc., 2015) Daw A.F.; El Rahman Abdallah M.A.; El Hennawy H.M.; Faculty of Engineering; MSA University; October; Egypt; Faculty of Engineering; MTC Collage; Cairo; Egypt; Faculty of Engineering; Ain Shams University; Cairo; Egypt
In this paper, a novel design of multi band (dual/quad) coupled gap transmission line resonators based on dual composite right/left handed microstrip structure is developed. The introduced structures demonstrate dual and quad resonances high selective sharpness passband response. The consummate structures was designed using one and two cells consist of a combination of a shunt tank related to interdigital capacitor and strip inductor, in addition to series tank intended using patch capacitor with small strip inductor. Furthermore, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results manifest four sharp pass band resonances at 4 GHz, 5.8 GHz, 6.6 GHz, and 7.7 GHz with transmission coefficients equal -0.69 dB, -1.9 dB, -3.9 dB, and -3.7 dB, respectively. The quality factor demonstrates very high selectivity and equals 75.75, 151.75, 125, and 82.7 at the four bands, respectively. � 2015 IEEE.
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.
Compact dual wide band D-CRLH three way power divider
(Institute of Electrical and Electronics Engineers Inc., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
A compact dual ultra-wide band power dividers based on three cells of dual composite right/left handed microstrip structure presented in this article. This introduced topology proposes dual band for multiband orthogonal frequency division multiplexing from 1 GHz-4.8 GHz with insertion loss -5 dB for three way power divider. The second band designed for direct sequence ultra-wideband from 6.2 GHz-9.5 GHz with insertion loss -5.2 dB for the divider. The rejection band extended from 5 to 5.8 GHz is introduces to avoid the interference between WLAN and UWB applications. The article elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. Furthermore, the design realizes compactness size 45.37 % over conventional T-junction power divider, and also, realizes compactness size 30.05 % over the most recently compact dividers. 2016 IEEE.
Compact high selective DGS band-pass filters for WLAN applications
(Institute of Electrical and Electronics Engineers Inc., 2017) Rashad M.K.; Ashraf M.; Daw A.F.; Ibrahim A.A.; Faculty of Engineering; MSA University; Cairo; Egypt; Faculty of Engineering; Minia University; Elminia; Egypt
In this paper, compact size band pass filters are proposed and designed for WLAN applications. The coupled DGS resonators are considered the main block of proposed band pass filters. The three proposed filters are designed by using the same defected ground structure shape, but with different feed line configurations. The feed line configuration affects the presence of transmission zeros in the rejection band to enhance the filter selectivity. So, we proposed three designs based on the different feed line configuration. The first design is band pass without transmission zero, the second is with one transmission zero, and the last one is band pass with two transmission zeros. In general, the three band pass filters are designed to operate from 5 GHZ to 6 GHZ with a central frequency of 5.5 GHZ, return loss higher than 25 dB and a wide stop band rejection up to 10 GHz with level lower than 30 dB, and an insertion loss lower than 0.5 dB is achieved within pass band. The simulated results are presented to show the performance of these filters. � 2017 IEEE.
Dual band high selective compact transmission line gap resonator
(Institute of Electrical and Electronics Engineers Inc., 2014) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
This paper presents, for the first time, a coupled gap transmission line resonator based on dual composite right/left handed microstrip structure. This introduced topology proposes dual band with high selective sharp band pass response. The whole structure is designed using only one cell comprised using a shunt tank of interdigital capacitor and strip inductor, and series tank formed using patch capacitor with small strip inductor. Moreover, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results exhibit two sharp insertion loss resonances at 5.8 GHz and 7.7 GHz with associated return loses better than 10 dB. Furthermore, the quality factor demonstrates very high selectivity and equals 194.3 and 142.3 at the two bands, respectively. � 2014 IEEE.
Dual-band divider has rejection band at 5 GHz
(Penton Publishing Co., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Department; Faculty of Engineering; MSA University; Cairo; Egypt; Electronic Engineering Department; MTC College; Cairo; Egypt; Electronics and Communication Department; Ain Shams University; Cairo; Egypt
[No abstract available]
Metamaterials mold multiband resonator
(PENTON MEDIA, 2018) Daw A.F.; Adly M.N.; Abdalla M.A.; Electrical Systems Engineering Department; MSA University; Cairo; Egypt; Electronic Engineering Department; Military Technical College (MTC); Cairo; Egypt
Advances in materials have been the springboard to enhancements in higher-frequency circuits and higher-efficiency, more compact circuits. As an example, the use of composite right/left-handed (CRLH) metamaterial transmission lines has made possible a miniature multiple-band resonator with frequencies extending from 2.8 to 10.4 GHz and high selectivity between the resonant circuit structures. In addition, the resonant structures have closely matched return losses.
New configuration for multiband ultra compact gap resonator based D-CRLH
(Institute of Electrical and Electronics Engineers Inc., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
A new compact multiband resonator based on one modified cell of dual-composite right/left-handed microstrip structure is presented in this paper. This introduced topology proposes triple band for 7.4 GHz, 9.2 GHz, and 13 GHz with insertion loss 2.3 dB, 0.6 dB, and 0.55 dB, respectively. Moreover, the return losses are equal 13 dB, 43 dB, and 10 dB, respectively. The paper elaborates the equivalent circuit model, analytical study and 3D full-wave simulation. Furthermore, the design realizes compactness size (13.2 � 5.9 mm2). The quality factor demonstrates selectivity equals 35, 8.18, and 48.1 at the four bands, respectively. � 2016 IEEE.
New inductor loaded composite right left hand impedance transformer for UWB wireless applications
(Institute of Electrical and Electronics Engineers Inc., 2015) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; MSA University; Communications and Electronics Dept; Cairo; Egypt; MTC Collage; Electronic Engineering Dept.; Cairo; Egypt; Ain Shams University; Electronics and Communications Dept.; Cairo; Egypt
A compact ultra wide band impedances transformer based on new configuration of composite right/left handed transmission line is presented. The proposed design introduces ultra wide band pass frequencies extended from 2 GHz up to 11 GHz with perfect matching transmission coefficient. However, the whole topology is designed using new loaded inductor configuration of CRLH. This L-CRLH is implemented using loaded inductor to construct shunt tank of gap capacitor and strip inductor, and shunt tank formed using patch capacitor with shorted strip inductor. Furthermore, the paper present analytical study, equivalent circuit model, 3D fall wave simulation and fabrication measurement results. The results shows perfect insertion losses equal 0.2 dB and return losses reach to 19 dB within extended band pass band from 2 GHz up to 11 GHz. Moreover, it introduces very compact size equal 2.7�8.6 mm2 (58% size reduction compared to single frequency ?/4 transformer) � 2015 IEEE.
A Novel L-CRLH Based Compact Wide Band Filtered Power Divider for WLAN Applications
(Institute of Electrical and Electronics Engineers Inc., 2018) Abdelhady N.N.; Hussien A.M.; Daw A.F.; Abdalla M.A.; Electronics and Communications Department; MSA University; Cairo; Egypt; Electronic Engineering Department; Military Technical College; Cairo; Egypt
A new compact power divider based on inductor loaded composite right/left-handed transmission line (L-CRLH) is presented in this paper. The proposed power divider size is only 17.3 15.4 mm 2 , (0.530.47) ? 2 g at mid frequency. The results show 3 dB insertion losses and 14 dB return losses at each output port in the frequency band 5 GHz to 6.5 GHz. Moreover, the power divider has filtering function. 2018 IEEE.
A Novel Ultra Compact Four-way Power Divider with Integrated Filtering Function for WLAN Applications
(Institute of Electrical and Electronics Engineers Inc., 2017) Hussien A.M.; Farag Y.S.; Daw A.F.; Abdalla M.A.; Electronics and Communications Department; MSA University; Cairo; Egypt; Electronic Engineering Department; MTC College; Cairo; Egypt
A four-way ultra-compact power divider is proposed in this paper for antenna array applications. The power divider is constructed based on composite right/left handed microstrip structure. The analytical analysis are presented. The divider operates at 5.2 GHz for WLAN services. This paper introduces equivalent circuit, 3D full wave simulation, and in addition to that, this design realizes compactness size 20�6 mm2, (0.62�0.186) ?2g. � 2017 IEEE.
Ultra compact quad band resonator based on novel D-CRLH configuration
(Institute of Electrical and Electronics Engineers Inc., 2017) Daw A.F.; Hussein O.T.; Abdelhamid H.S.; Abdalla M.A.; Electronics and Communications Engineering Department; MSA University; Cairo; Egypt; Electronic Engineering Department; MTC College; Cairo; Egypt
This paper represents an ultra-compact quad band resonator based on novel configuration of dual-composite right/left handed transmission line. This design broaches quad band for 7.3 GHz, 8.3 GHz, 11.9 GHz, and 13.8 GHz along with insertion losses of 2.2 dB, 0.27 dB, 2 dB, and 1.5 dB, respectively. Furthermore, the return losses are 12.2 dB, 36 dB, 20.5 dB, and 19.5 dB, respectively. The quality factor proclaims selectivity equals 42.33, 15.58, 15.87, and 31.1, at the four frequencies respectively. The paper amplifies the equivalent circuit design, mathematical study, and 3D full-wave simulation. Additionally, the design actualizes a compactness size of 13.2 � 16.5 mm2 (0.548 � 0.6855 ?g 2 ). � 2017 IEEE.