01. Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed

Permanent URI for this communityhttps://hdl.handle.net/20.500.14365/1

Browse

Now showing 1 - 5 of 5

Citation - Scopus: 1
Beamforming Network for 5g Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Raafat, M.A.; Allam, A.M.M.A.; Helala, M.A.; Ghanem, M.G.; Fawzy, Diaa E.; Abbas, M.A.; Abo, Sree, M.F.
This paper is devoted to the design, analysis, and implementation of switched beamforming network operating at 5.2 GHz for 5G applications. It is intended to launch four beams. The Butler matrix feeding network is presented to electronically switch the beam in the desired direction. This work achieves a good approach to alleviate the problem of cross-over implementation and fabrication. A Four-element array of printed antennas is designed and fabricated. The network and array are implemented on Rogers RT/duroid 5880 substrate with a relative permittivity of 2.2 and a thickness of 1.04 mm. The different scattering parameters are simulated using both ADS and CST which conduct good agreement between the simulated and measured results. © 2023 IEEE.
Citation - Scopus: 3
Design and Implementation of Smart Watch Textile Antenna for Wi-Fi Bio Medical Applications in Millimetric Wave Band
(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Ghanem, M.G.; Fawzy, Diaa E.; Raafat, M.A.; Abbas, M.A.; Abo, Sree, M.F.; El-Din, M.S.H.S.
This paper is devoted to the design and implementation of smart watch textile antenna for Wi-Fi bio-medical applications in millimetric wave bands. The antenna is implemented on the leather textile-based substrate to be embedded in a smart watch. It enables the watch to pick up Wi-Fi signals without the need to be connected to a mobile through Bluetooth. It operates at 60 GHz or WiGig (Wireless Gigabit Alliance) band with a wide band for higher-rate applications. It also could be implemented over many stratified layers of the body organisms to be used in the diagnosis of many diseases like diabetes and cancer. The structure is designed and simulated using CST (Studio Suite) program. The wearable patch antenna has an octagon shape and it is implemented on leather material that acted as a flexible substrate with a size of 5.632 x 6.4 x 2 mm 3, relative permittivity of 2.95, and loss tangent of 0.006. The feeding is carried out using differential feed (discrete port in CST). This work provides five antenna implementations; antenna without ground, a ground is added at the back of the antenna in order to increase the antenna gain, the substrate dimensions are increased to 15 x 30 mm2 to resemble the real hand watch size, layers of skin and fat are added under the ground of the antenna to study the effect of human body tissues human on the antenna performance. Finally, the whole structure is bent. It is found that the antenna can achieve a simulated peak realized gain in dB of 5.68, 7.28, 6.15, 3.03, and 4.37 for antenna without ground, antenna with the ground, antenna with larger substrate dimensions, antenna with skin and fat, and bent structure, respectively. The antenna with ground exhibits high gain, while adding the human organisms absorption, the gain is degraded because of human absorption. The bent structure contributes to higher gain. © 2023 IEEE.
Citation - Scopus: 2
A Multi-Band Textile-Based Mtm Absorber for Energy Harvesting Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Helala, M.A.; Fawzy, Diaa E.; Abbas, M.A.; Sree, M.F.A.; Parchin, N.O.; Amar, A.S.I.
This paper is devoted to design and implementation of multi-band textile based Metamaterial absorber operating at K and Ku bands to be deployed in energy harvesting system. The unit cell of the absorber comprises a ground plane of copper annealed, Felt textile and top ground layer with etched Jerusalem cross surrounded with etched square ring. It provides three highly resonant peaks at 16.7 GHz, 18.6GHz, and 22.45 GHz, with absorption percentages of 99.8%, 96.5%, and 99.7%, respectively. The full width at half maximum (FWHM) is 3.35 GHz (19%) at 17.6 GHz. In addition, the absorber provides a wideband of absorption for oblique incidence up to 20 degrees and also at different bending radii. The relative permittivity and permeability are studied to demonstrate it effect on the absorption mechanism. A negative index of refraction is achieved over a band of 6.5 GHz from 16 GHz to 22.5 GHz, which leads to perfect absorptivity. © 2023 IEEE.
Citation - Scopus: 1
Re-Configurable Power Divider Based on Printed Ridge Gap Waveguide Technology
(Institute of Electrical and Electronics Engineers Inc., 2023) Ali, M.M.M.; Shams, S.I.; Elsaadany, M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Abbas, M.A.; Abo, Sree, M.F.
Future Millimeter Wave (mmWave) band communication systems are predicted to be involved in different and diverse fields. These systems will be smart with high speed that enable the emergence of fundamental and advanced services. In order to realize these systems we need the use of reconfigurable microwave components implemented based on modern guiding structures. Power dividers are considered one of the essential components for the feeding antenna system. In this paper, Re-configurable Printed Ridge Gap Waveguide (RPRGW) is deployed to implement a power divider. The simulated results show a wide bandwidth of 16 % at 38.5 GHz. These results demonstrate the merit of using this technology to implement various microwave components suitable for smart communication systems. © 2023 IEEE.
Citation - Scopus: 1
An Ultra-Wideband Textile-Based Perfect Superstrate Metamaterial Absorber for 6g Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Helala, M.A.; Ghanem, M.G.; Raafat, M.A.; Fawzy, Diaa E.; Akarsu, Gokberk; Abbas, M.A.
This paper presents an ultra-wideband textile-based perfect Metamaterial absorber for 6G applications. The design geometry of the unit cell is based on a modified split ring resonator and optimized akin to the word 6G. It enables a wideband in sub-THz at the standard of FCC. The structure consists of three layers; the ground layer, the textile layer, and MTM resonators. The two resonators are 6G and L shaped. The structure is optimized in terms of the different dimensions of both resonators. For more enhancement of the absorptivity band, superstrate textile material is added on top of the resonator's structure. It enhances the band by 6 %. The structure is subjected to different angles of incidence to study the sensitivity of the absorber to that angle. It contributes a bandwidth of 17.135 GHz up to 30 degrees and an FWHM of more than 33.332 GHz up to 45 degrees. The textile material used is felt having a permittivity of 1.27, thickness of 0.6 mm, and tangent loss of 0.016. The overall size of the absorber is 2.4 mm x 2.4 mm x 1.27 mm. © 2023 IEEE.

Browse

Browsing 01. Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed by Author "Abbas, M.A."