استعرض Network & Communication حسب المؤلف "Ullah, Ubaid"
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Correlation Reduction in Closely-Spaced MIMO Antenna with Circular Polarization Diversity
Ullah, Ubaid; Al-Hasan, Muath; Ben Mabrouk, Ismail; Koziel, Slawomir; Abbasi, Qammer; Alomainy, Akram (Institute of Electrical and Electronics Engineers Inc., 2020)Radiator correlation in multiple-input-multiple-output (MIMO) antenna has always been a serious concern for MIMO systems. In this paper, an antenna consisting of two parallel-placed coplanar waveguide (CPW)-fed radiators ... -
Enhanced-performance circularly polarized MIMO antenna with polarization/pattern diversity
Ullah, Ubaid; Ben Mabrouk, Ismail; Kozieł, Sławomir (Institute of Electrical and Electronics Engineers (IEEE ), 2020)Design of a compact wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna with polarization diversity is proposed and characterized for off-body communication. The antenna is based on a simple ... -
Expedited re-design of multi-band passive microwave circuits using orthogonal scaling directions and gradient-based tuning
Koziel, Slawomir; Pietrenko-Dabrowska, Anna; Ullah, Ubaid (Nature Research, 2024-12)Geometry scaling of microwave circuits is an essential but challenging task. In particular, the employment of a given passive structure in a different application area often requires re-adjustment of the operating ... -
Highly integrable planar-structured printed circularly polarized antenna for emerging wideband internet of things applications in the millimeter-wave band
Ullah, Ubaid; Koziel, Slawomir; Pietrenko-Dabrowska, Anna (Nature Research, 2024)This paper proposes a numerically and experimentally validated printed wideband antenna with a planar geometry for Internet of Things (IoT) applications. This design tackles the challenges associated with deploying IoT ... -
Implementation of Spatial/Polarization Diversity for Improved-Performance Circularly Polarized Multiple-Input-Multiple-Output Ultra-Wideband Antenna
Ullah, Ubaid; Ben Mabrouk, Ismail; Kozieł, Kozieł, Sławomir; Al-Hasan, Muath (IEEE, 2020)In this paper, spatial and polarization diversities are simultaneously implemented in an ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna to reduce the correlation between the parallel-placed radiators. ... -
A low-profile hybrid multi-permittivity dielectric resonator antenna with perforated structure for Ku and K band applications
Zubir, Ihsan Ahmad; Othman, Mohamadariff Arif.; Ullah, Ubaid; Kamal, Shahanawaz; Ab Rahman, Mohd Fariz; Hussin, Roslina; Bin Mohamed Omar, Mohamad Faiz; Mohammed, Abdullahi S.B.; Bin Ain, Mohd Fadzil; Ahmad, Zainal Arifin; Abdullah, Mohd Zaid (Institute of Electrical and Electronics Engineers Inc., 2020)A wideband hybrid dielectric resonator antenna (DRA) consisting of a rectangular slot patch and a perforated stacked cylindrical dielectric resonator (DR) is proposed. A rectangular slot was etched on the grounding side ... -
A Low-Profile Quasi-Loop Magneto-Electric Dipole Antenna Featuring a Wide Bandwidth and Circular Polarization for 5G mmWave Device-to-Device Communication
Kamal, Shahanawaz; Ain, Mohd Fadzil Bin; Ullah, Ubaid; Mohammed, Abdullahi S. B.; Hussin, Roslina; Omar, Mohamad Faiz Bin Mohamed; Najmi, Fathul; Ahmad, Zainal Arifin; Rahman, Mohd Fariz Ab; Mahmud, Mohd Nazri; Othman, Mohamadariff; Mohamed, Julie Juliewatty (Korean Institute of Electromagnetic Engineering and Science, 2022)The deployment of the millimeter (mmWave) frequency spectrum by fifth-generation (5G) device-to-device (D2D) wireless networks is anticipated to meet the growing demands for increased capacity. The antenna is regarded of ... -
Mathematical model on the effects of conductor thickness on the centre frequency at 28 GHz for the performance of microstrip patch antenna using air substrate for 5G application
Mohammed, Abdullahi S.B.; Kamal, Shahanawaz; Bin Ain, Mohd Fadzil; Hussin, Roslina; Najmi, Fathul; Sundi, Shahrel Azmin; Ahmad, Zainal Arifin; Ullah, Ubaid; Bin Mohamed Omar, Mohamad Faiz; Othman, Mohamadariff (Elsevier, 2021)The use of microstrip patch configuration in the 5th generation (5G) wireless network is expected to fulfill the demands of smartphone users by significantly increasing the capacity of com munication technology. The main ... -
A nested square-shape dielectric resonator for microwave band antenna applications
Ullah, Ubaid; Ben Mabrouk, Ismail; Al-Hasan, Muath; Nedil, Mourad; Ain, Mohd Fadzil (Institute of Advanced Engineering and Science, 2021)In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band. A solid square dielectric resonator (SSDR) was modified systematically by ... -
A novel negative meander line design of microstrip antenna for 28 GHz mmWave wireless communications
Kamal, Shahanawaz; Mohammed, Abdullahi S. B.; Bin Ain, Mohd Fadzil; Ullah, Ubaid; Hussin, Roslina; Arifin Ahmad, Zainal; Othman, Mohamadariff; Ab Rahman, Mohd Fariz (Czech Technical University, 2020)The increasing applications for nomadic computing have experienced enormous development over the preceding decade. This has eventually caused the lack of bandwidth. Therefore, to accomplish the need of consumers, compact ... -
Reduced-cost two-level surrogate antenna modeling using domain confinement and response features
Pietrenko‑Dabrowska, Anna; Koziel, Slawomir; Ullah, Ubaid (Nature Research, 2022)Electromagnetic (EM) simulation tools have become indispensable in the design of contemporary antennas. Still, the major setback of EM-driven design is the associated computational overhead. This is because a single full-wave ... -
Wheel-shaped miniature assembly of circularly polarized wideband microstrip antenna for 5G mmWave terminals
Kamal, Shahanawaz; Bin Ain, Mohd Fadzil; Ullah, Ubaid; Mohammed, Abdullahi S.B.; Najmi, Fathul; Hussin, Roslina; Ahmad, Zainal Arifin; Bin Mohamed Omar, Mohamad Faiz; Ab Rahman, Mohd Fariz; Mahmud, Mohd Nazri; Othman, Mohamadariff (Elsevier B.V., 2021)A simple arrangement of wheel-shaped copper microstrip antenna is presented for operation in the 24 GHz frequency band. In this structure, a coaxial feed probe was utilized to generate vertical polarization, and a wheel-shaped ...