Browsing by Author "Fawzy, D.E."

Now showing 1 - 3 of 3

Developement of 4-Ports Mimo Cp Antennas for Radar Applications
(Institute of Electrical and Electronics Engineers Inc., 2024) Said, A.; Allam, A.M.M.A.; Fawzy, D.E.; Sahin, O.N.
This paper introduces a printed four-port MIMO antenna with advantages such as compact size, excellent MIMO diversity performance, and simple geometry for radar applications at 10 GHz. It is small size makes it suitable for integrating various telecommunication devices for multiple applications, with a prototype measuring 32 mm × 32 mm × 4.3 mm. The mutual coupling between the individual elements significantly im-pacts the MIMO system's diversity properties, and an effective technique of orthogonally positioning the antenna elements to each other increases their isolation resulting in superior MIMO diversity performance. It is evaluated through S-parameters and MIMO diversity parameters to ensure its suitability for future radar applications. It is validated through measurements, and the results showed a good match between simulated and measured results. The different diversity parameters such as (Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Channel Capacity Loss (CCL), Multiplexing Efficiency (ME), Total Active Reflection Coefficient (TARC) are simulated and measured. It is found that all values are within the standard norms which indicates the availability for MIMO radar applications. © 2024 IEEE.
Development of a Split Ring Resonator Sensor for Vibration Detection
(Institute of Electrical and Electronics Engineers Inc., 2024) Zengin, E.B.; Fawzy, D.E.; Allam, A.M.M.A.; Şahin, O.N.
The main focus of this work is the development of a metamaterial-based vibration sensor for the detection of earthquake amplitudes. The sensor is composed of two metamaterial layers made of FR-4 substrates with Circular Split Ring Resonators (CSRR) arranged in a back-to-back configuration on each substrate. The variation of the spacing between the plates results in an alteration of the electric field and thus changes in the resonance frequencies of the whole system. The system is designed and optimized to resonate in the GSM 1.8 GHz band, which ultimately results in a self-sustaining sensor. A clear relationship between the spacing of the two layers and the shift in the resonance frequency has been obtained. It also changes the magnitude of the reflected and absorbed energy from the sensor. This spacing in turn can be directly correlated with the vibration amplitudes. The system can be integrated into a warning system with the ability to quantify the structural resilience of buildings against potentially damaging vibrations. Different unit cell geometries of metamaterial surface are tested before selecting the CSRR geometry to develop highly sensitive sensors operating in the GSM frequency band at 1.8 GHz. © 2024 IEEE.
Citation - Scopus: 1
Mimo Slot Antenna With Polarization Diversity and Dual Notched Bands for Uwb Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Parchin, N.O.; Amar, A.S.I.; Fawzy, D.E.; Allam, A.M.M.A.; Eid, A.M.; Ibrahim, A.G.A.
This paper introduces a 4-port MIMO slot antenna system with dual notched bands, which is designed for future wireless communications. The antenna structure consists of four modified U-shaped radiation stubs with a shared ground plane, arranged in a planar form. The results demonstrate that the antenna operates effectively across frequencies ranging from 2.1 to 10.7 GHz, covering the entire ultra-wideband (UWB) spectrum. Moreover, two notched filtering characteristics have been incorporated at 3.3 to 4.2 GHz and 5 to 6 GHz, utilizing modified radiation stub resonators. These notches effectively suppress interference from C-band, WLAN, and WiMAX interfaces. The performance of the proposed antenna design has been thoroughly evaluated in terms of its fundamental characteristics. The results show that the antenna achieves satisfactory scattering parameters, 3D radiation patterns, efficiency, and gain levels. The designed UWB antenna system fulfills the requirements for MIMO and diversity applications. © 2023 IEEE.