Browsing by Author "Abdalla M.A."

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Building a zero-order BPF with CRLH transmission lines
(PENTON MEDIA, 2018) Abdalla M.A.; Hassan A.Y.; Ibrahim A.A.; Electronic Engineering Department; MTC College; Cairo; Egypt; Electronics and Communications Department; MSA University; Giza; Egypt; Communications and Electronics Department; Faculty of Engineering; Minia University; Minia; Egypt; University Oierre and Marie Curie; Sorbonne University; Paris VI; France
Miniaturization of RF/microwave filters helps pave the way to developing smaller wireless devices for internet access. Using metamaterials and circuit structures such as composite-right-left-handed (CRLH) resonators has proven effective in shrinking RF/microwave filter circuits and was demonstrated in the design of a compact bandpass filter (BPF) well-suited for WiMAX wireless applications. � 2018, PENTON MEDIA. All rights reserved.
A capacitive loaded CRLH in reversal triple band MIMO antenna
(Institute of Electrical and Electronics Engineers Inc., 2019) Abdalla M.A.; Elmowafy A.M.; Ghaly T.M.; Military Technical College; Electronic Engineering Department; Cairo; Egypt; October University for Modern Sciences and Arts (MSA); Electrical Systems Engineering Department; Cairo; Egypt
In this paper, we present a compact and high isolated multiband two elements MIMO antenna. The single antenna is based on new capacitor loading of composite right/left handed (C-CRLH) unit cell configuration. A resonant one cell antenna is designed for having triple band at 1.95 GHz, 3.6 GHz and 6.5 GHz. The MIMO configuration has been designed in opposite mirror configuration to have high isolation between the elements without the need of using additional mutual coupling techniques between the elements. The single antenna overall size is 38 28 mm2. The achieved results confirm that the antenna has reflection coefficient less than-10 dB at the three frequencies and transmission coefficient less than-20 dB. The obtained results are achieved using circuit modeling and full wave simulations. � 2019 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.
A compact dual-band flexible CPW-fed antenna for wearable applications
(Institute of Electrical and Electronics Engineers Inc., 2017) El Atrash M.; Bassem K.; Abdalla M.A.; Electrical Systems Engineering Department; October University for Modern Sciences and Arts (MSA); Cairo; Egypt; Electromagnetic Fields Group; Electronic Eng. Dep.; MTC College; Cairo; Egypt
This paper presents a compact, dual-band, flexible, Co-Planar Waveguide (CPW)-fed antenna. The compact size is achieved by employing meander line technique. The antenna is implemented on a flexible substrate, Gil GML 1034; thus, it is appropriate to be realized for wearable applications. Dual-band is attained at 2.4 GHz of the ISM Band and 5.2 GHz, respectively. Hence, serving the Radio Frequency Identification (RFID) and Wireless Local Area Network (WLAN) applications. � 2017 IEEE.
A compact high selective coupled gap CRLH TL based bandpass filter
(Institute of Electrical and Electronics Engineers Inc., 2015) Abdalla M.A.; Hassan A.Y.; Eldin A.M.G.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA University; Electronics and Communications Department; Giza; Egypt
This paper exhibits a new compact high selective gap band pass filter designed for the 5 GHz WiMAX service. The filter is based on fourth order coupling of coupled gap composite right left handed transmission line resonators. The resonators are designed to demonstrate a zeroth order mode at the passband center frequency for filter size reduction. The filter has a compact size 2020 mm2. The design concepts of the coupled filter response are discussed and verified using full electromagnetic full wave simulations and confirmed by experimental measurements with good agreements. The results confirm that the filter has 1.5 dB insertion loss and better than-25 transmission zero. 2015 IEEE.
A compact SIW metamaterial coupled gap zeroth order bandpass filter with two transmission zeros
(Institute of Electrical and Electronics Engineers Inc., 2016) Abdalla M.A.; Mahmoud K.S.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA University; Electronics and Communications Department; Giza; Egypt
This paper presents a new compact metamaterial bandpass filter based on coupled gap composite right left handed transmission line resonator using substrate integrated waveguide to become low loss. The filter size is only 2015 mm2 which is (0.61 ?g) at center frequency (6.8 GHz). Moreover, the filter was designed to demonstrate a zeroth order at 6.8 GHz with two transmission zeros; the first one is at -44 dB and the second one is close to -50 dB in a high selective characteristics (less than only 300 MHz from centre frequency). The paper exhibits the equivalent circuit model, 3D full wave simulation and fabrication measurement results. Good agreement between the presented data is achieved. � 2016 IEEE.
A compact triple-band left-handed antenna for GSM/WiMAX applications
(Institute of Electrical and Electronics Engineers Inc., 2015) Abdalla M.A.; Sadek F.H.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA University; Electronics and Communications Department; Giza; Egypt
This paper introduces a new compact triple band left handed antenna. Applying a composite right left handed transmission line, and open circuit termination load, the antenna operates at triple band frequencies, 1.8 GHz, 3.5 GHz and 5.8 GHz with total size 21�25 mm2 (only 27% compared to conventional microstrip antenna). A compromise between the proposed antenna's compact size and efficiency is made, as a result the antenna provides a maximum directive gain equals 1.37 dB, 2.76 dB and 3.61 dB, respectively. The proposed antenna can serve WiMAX and GSM applications efficiently. The antenna performance is validated by full wave simulation and experimental measurements. � 2015 IEEE.
Compact UWB LPF based on uni-planar metamaterial complementary split ring resonator
(Institute of Electrical and Electronics Engineers Inc., 2016) Abdalla M.A.; Arafa G.; Saad M.; MTC College; Electronic Engineering Department; Cairo; Egypt; Modern Sciences and Arts University; Department of Electronics and Communication; Giza; Egypt
This paper presents a compact ultra-wide low pass filter based on a new configuration of metamaterial complementary split ring resonator. The resonator is etched in the top plane of the microstrip as new contribution for using it in filter applications. The filter has insertion loss close to 0 dB over the frequency band DC up to 10.8 GHz. Also, the filter has the advantage of small size (18 mm � 7 mm) whose length is only about 32% of the guided wave length at mid frequency. Different order types of this filter are discussed in the paper. The filter design is explained and its performance is validated using full wave simulation and experimental measurements. Very good agreement between the two results is achieved which confirm the theoretical design. � 2016 IEEE.
Design of an Ultra-thin Compact Flexible Dual-Band Antenna for Wearable Applications
(Institute of Electrical and Electronics Engineers Inc., 2018) Kadry M.; Atrash M.E.; Abdalla M.A.; Electrical Systems Engineering Department; October University for Modern Sciences and Arts (MSA); Cairo; Egypt; Electronic Eng. Dep.; Electromagnetic Fields Group; Military Technical College; Cairo; Egypt
In this paper, a dual-band, flexible antenna is suggested. The low profile antenna, 35 20 mm 2 , is fed using the well known Co-Planar Waveguide (CPW) configuration, where it operates at 2.44 GHz and 5.8 GHz of the Industrial Scientific and Medical (ISM) radio band. By employing the flexible Rogers Ultralam 3850 as the antenna substrate, the proposed antenna exhibited high flexibility. Due to its compactness, flexibility and dual-band resonance at the ISM band, the antenna is highly chosen to be applied for wearable applications. 2018 IEEE.
A Double Optimized Transmission Zeros Based on ?-CRLH Dual-Band Bandpass Filter
(Electromagnetics Academy, 2019) Hassan A.Y.; Abdalla M.A.; Electronics and Communications Department; MSA University; Giza; Egypt; Electromagnetic Waves Group; Electronics Engineering Department; MTC College; Cairo; Egypt
In this paper, design and measurements of a highly selective ?-CRLH dual-band bandpass filter, with transmission zeros optimized to serve Wi-Max applications, is presented. The dual-bands are designed at 5.2 and 5.7 GHz with a sharp rejection level between them and transmission zeros before and after the passbands. The filter is designed using coupled gap zeroth order composite right/lefthanded (CRLH) resonators, which results in significant filter size reduction. Furthermore, two different coupled ?-CRLH filters are discussed through the work development of this paper. The filter design concepts are verified and confirmed using electromagnetic simulations and experimental measurements. Presented results reveal that the proposed filter exhibits a rejection level greater than ?20 dB, while maintaining 2 dB insertion loss and better than ?25 dB for the transmission zeros with compact size (12 � 16mm2) which is 70% smaller than similar conventional filters. � 2019 Progress In Electromagnetics Research Letters. All rights reserved.
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 notching of UWB antenna using double inversed U-shape compact EBG structure
(Institute of Electrical and Electronics Engineers Inc., 2016) Abdalla M.A.; Al-Mohamadi A.; Mostafa A.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA University; Electronics and Communications Department; Giza; Egypt
This paper presents an ultra-wideband monopole antenna integrated with a new configuration of electromagnetic band gap (EBG) structure. The operating frequency band of the ultra-wideband antenna is 3.1 GHz-10.6 GHz whereas the dual rejected centre frequencies are 5.2 GHz and 5.8 GHz. These two notched bands are to eliminate interference with wireless local area networks. The new proposed EBG structure is composed of a double inversed U-shape slotted patch and edge-located via. By using this new EBG structure, a high notching selectivity can be achieved for both bands. Compared to conventional mushroom-like EBG structure, the proposed configuration of the EBG structure can reject dual band instead of single band and it is 73 % smaller. The detailed theoretical explanations supported by electromagnetic full-wave simulations and confirmed by experimental measurements are introduced. � 2016 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]
A Flexible High Gain Wide-Band Antenna for Wireless and Wearable Applications
(Institute of Electrical and Electronics Engineers Inc., 2018) Abdalgalil O.F.; Atrash M.E.; Abdalla M.A.; Electromagnetic Fields Group; October University for Modern Sciences and Arts (MSA); Cairo; Egypt; Electromagnetic Fields Group; Electronic Eng. Dep.; Military Technical College; Cairo; Egypt
A wideband, flexible printed antenna, fed via the Co-Planar Waveguide (CPW) geometry, with high gain is presented in this paper. The high gain was realized by using a reflector on the same level with the radiator and around it. The high gain performance of the antenna was observed throughout the whole wide spectrum of 1.53 GHz to 2.74 GHz, with a percentage bandwidth of approximately 57%. For flexibility, the antenna was printed on the flexible Rogers Ultralam 3850 substrate. With such characteristics, the antenna can be recognized in a number of wireless applications; such as, WLAN, WI-Max and RFID, as well as, wearable applications. C 2018 IEEE.
Gain enhancement of a compact thin flexible reflector-based asymmetric meander line antenna with low SAR
(Institution of Engineering and Technology, 2019) El Atrash M.; Abdalla M.A.; Elhennawy H.M.; Department of Electrical Systems Engineering; October University for Modern Sciences and Arts; 26 July Mehwar Road intersection with Wahat Road; 6th October City; Egypt; Department of Electronic Engineering; Military Technical College; El-Qobba Bridge; Al Waili; Cairo; Egypt; Department of Electronics and Communications; Ain Shams University; Abbasseya; Cairo; Egypt
A compact, flexible, coplanar waveguide-fed, U-shaped reflector surrounded asymmetric meander line antenna operating at 2.4.GHz is presented for wrist wearable applications. The antenna is printed on flexible Rogers Ultralam 3850 substrate. Size reduction of 67.7% was attained by employing the meandering methodology, in comparison with the printed straight monopole. The design displays a gain of around 3.dB by incorporating a U-shaped reflector, on the same level as the radiator, which is considered as the main contribution of the proposed design. Bending scenarios were studied proving the antenna robustness against bending. The proposed antenna was bent over a human body model with optimum separation distance, where enhancement of the specific absorption rate (SAR) level has been achieved, compared to the symmetric meander line antenna. The antenna was fabricated and measured where a high agreement was met in terms of simulated and measured return loss and radiation pattern polar plots, as well as, simulated and measured gain. � The Institution of Engineering and Technology.
High selective SRR-based narrow band filter with 0° feed structure
(Institute of Electrical and Electronics Engineers Inc., 2018) Fouda Z.K.; Ibrahim A.A.; Abdalla M.A.; Electrical Systems Engineering Department; October University for Modern Sciences and Arts; Giza; Egypt; Electronic Engineering Department; El-Minia University; El-Minia; Egypt; Electronic Engineering Department; Military Technical College (MTC); Cairo; Egypt
The design of two band pass metamaterial filters with high selectivity based on the coupling matrix technique is presented. The design methods discussed below are applied to metamaterial split ring resonators (SRRs) of second order but of differing feed structure. The high selectivity requirement of the second proposed filter is fulfilled through the use of a 0� feed structure which furnishes the filter response with two transmission zeros. The proposed band pass filters are devised to adhere to wireless LAN application requirements with a center frequency of 2.4 GHz. Both the simulated and measured results of the proposed filters show an insertion loss below 0.7 dB within the pass band range. The final proposed filter boasts a compact size of only 3 ? 2 cm2 due to the use of SRRs. � 2018 IEEE.
Hybrid termination of metamaterial CRLH antennas
(Institute of Electrical and Electronics Engineers Inc., 2015) Abdalla M.A.; Sadek F.; Electromagnetic Fields Group; Electronic Eng. Dep.; MTC College; Cairo; Egypt; Communication and Electronics Dept.; MSA University; Cairo; Egypt
This paper introduces a new hybrid termination of composite right left handed antenna. The hybrid termination if formed by short circuit loading coupled to open loading through air gap capacitor. A novel antenna operates at 2.4 GHz and 5.2 GHz with antenna dimensions 21�30 mm2 (only 9% compared to conventional microstrip antenna). The proposed new termination has resulted in increasing the electrical length of the open circuit composite right left handed antenna by 20%. for the same physical dimensions. The proposed antenna theoretical concepts is explained. The antenna performance is validated by full wave simulation and experimental measurements. � 2015 IEEE.
A low profile flexible circularly polarized antenna for wearable and WLAN applications
(Springer Verlag, 2019) Ali A.M.; El Atrash M.; Zahran S.R.; Abdalla M.A.; MSA University; Electrical Systems Eng. Department; Cairo; Egypt; Arab Academy for Science and Technology; Comm. and Elect. Engineering Dep.; Cairo; Egypt; MTC College; Electronic Engineering Department; Cairo; Egypt
A low profile, flexible, circularly polarized antenna based on the artificial material methodology is introduced in this paper. The antenna footprint is 20 mm � 15 mm, where it is excited by the Co-Planar Waveguide (CPW) configuration. Flexibility is achieved by incorporating Rogers Ultralam 3850 as the antenna substrate. By protruding an inverted T-shaped slot from the radiator to the extended CPW ground plane, circular polarization was achieved. The design radiates at 5.2 GHz with a-10 dB bandwidth of 29.7 MHz, gain of 0.7 dBic, boresight Axial Ratio (AR) of 0.86 dB, and 3 dB-AR bandwidth of 64.3 MHz. With such characteristics, the antenna is targeting wearable and Wireless Local Area Network (WLAN) applications. 2019 IEEE.
Metamaterials inspired dual-wide band CPW-fed antenna using split ring resonator structure
(Institute of Electrical and Electronics Engineers Inc., 2016) Abdalla M.A.; El-Sobky N.A.; El-Gabry M.N.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA University; Electronics and Communications Department; Giza; Egypt
This paper presents a metamaterial inspired dual-wide band CPW-fed antenna using split-ring resonator structure. The antenna design is inspired from conventional circular monopole antenna to two split rings resonators. The antenna geometry is optimized to achieve two wide bands; the lower band covers the band 2.65 GHz to 3.25 GHz where the higher band covers the band 5 GHz to 7 GHz. The antenna dimensions are optimized for compact size (30 mm � 30 mm). The antenna radiation pattern is kept as Omni-directional in both bands. Full wave simulation and experimental measurements results are introduced with good matching between them. � 2016 IEEE.