Author
Sana Khan
Other affiliations: Sir Syed University of Engineering and Technology, University of Dammam
Bio: Sana Khan is an academic researcher from Istanbul Medipol University. The author has contributed to research in topics: Radiation pattern & Dipole antenna. The author has an hindex of 3, co-authored 16 publications receiving 37 citations. Previous affiliations of Sana Khan include Sir Syed University of Engineering and Technology & University of Dammam.
Papers
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29 citations
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01 Mar 2017TL;DR: In this paper, a 2D electromagnetic band gap (EBG) structure is designed on the ground plane of 1×2 rectangular patch antenna array to reduce the mutual coupling between the two elements and enhance the radiation pattern.
Abstract: A 2D electromagnetic band gap (EBG) structure is designed on the ground plane of 1×2 rectangular patch antenna array to reduce the mutual coupling between the two elements and enhance the radiation pattern. An isolation of −41 dB has been achieved with the EBG structure relative to −20 dB without the EBG.
12 citations
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01 Nov 2017TL;DR: A compact dual-band Planar Inverted F-antenna (PIFA) antenna useful for E-health monitoring and wireless sensors systems and performs well in the presence of a bio-compatible insulator (BCI) material.
Abstract: This work presents a compact dual-band Planar Inverted F-antenna (PIFA) antenna useful for E-health monitoring and wireless sensors systems. The antenna operates in the Industrial Standard and Medical (ISM) and Wireless Medical Telemetry Service (WMTS) bands. It offers a compact size with dimensions 12.6 × 8.5 × 2.4 mm3. Two different simulators have been used to verify the results. The proposed antenna performs well in the presence of a bio-compatible insulator (BCI) material.
6 citations
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07 Nov 2020TL;DR: In this paper, the mutual coupling compensation in uniform linear and circular receiving antenna arrays of thin wire dipoles is presented, and it is observed that the mutual impedance is independent of the incident angle and depends solely on the geometry of the array.
Abstract: Mutual coupling compensation in uniform linear and circular receiving antenna arrays of thin wire dipoles is presented. It was observed that the mutual impedance is independent of the incident angle and depends solely on the geometry of the array. By using only one measurement, decoupling matrix is computed and direction of arrival is estimated.
5 citations
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TL;DR: Simulation results show that mutual coupling degrades the sum-rate performance of the NOMA system in all three array structures, especially in the UCA structure due to the smaller spacing of the array element in a circular shape, but compensating the mutual coupling effect by the MOM technique in the case of unknown MC or matrix inversion significantly improves the system sum- rate in all scenarios.
Abstract: This paper investigates the impact of mutual coupling (MC) on the achievable sum-rate of power-domain non-orthogonal multiple access (NOMA) system in both uplink (UL) and downlink (DL) transmissions. We assume a single-antenna user NOMA system with directional beamforming in the millimeter wave (mmW) channel. Due to the electromagnetic interaction between the antenna elements, called mutual coupling, at the base station (BS), the steering vector of the channel is affected. Consequently, this leads to distorted antenna pattern pointing towards different directions and reduction in channel gain, based on antenna array structure. In this paper, different antenna geometries and configurations, such as one-dimensional (1D) uniform linear array (ULA), two-dimensional (2D), and three-dimensional (3D) uniform circular array (UCA), are implemented at the BS, where induced electromotive force (EMF) and method of moment (MOM) techniques are used to generate the MC coefficients. We first examine the antenna patterns affected by MC, followed by channel gains of user terminals (UT)s. Then sum-rate of the NOMA system is modified in the presence of MC. Furthermore, mutual coupling is compensated successfully for both UL and DL systems for the given antenna structures. Simulation results show that mutual coupling degrades the sum-rate performance of the NOMA system in all three array structures, especially in the UCA structure due to the smaller spacing of the array element in a circular shape, resulting in symmetric mutual coupling from both sides of the circle. On the other hand, it is also shown that compensating the mutual coupling effect by the MOM technique in the case of unknown MC or matrix inversion in the case of known MC significantly improves the system sum-rate in all scenarios.
4 citations
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TL;DR: In this paper, a light-emitting diodes based on vertical heterojunctions composed of n-type monolayer MoS2 and p-type silicon was realized.
Abstract: Two-dimensional (2D) materials are a new type of materials under intense study because of their interesting physical properties and wide range of potential applications from nanoelectronics to sensing and photonics. Monolayers of semiconducting transition metal dichalcogenides MoS2 or WSe2 have been proposed as promising channel materials for field-effect transistors. Their high mechanical flexibility, stability, and quality coupled with potentially inexpensive production methods offer potential advantages compared to organic and crystalline bulk semiconductors. Due to quantum mechanical confinement, the band gap in monolayer MoS2 is direct in nature, leading to a strong interaction with light that can be exploited for building phototransistors and ultrasensitive photodetectors. Here, we report on the realization of light-emitting diodes based on vertical heterojunctions composed of n-type monolayer MoS2 and p-type silicon. Careful interface engineering allows us to realize diodes showing rectification and light emission from the entire surface of the heterojunction. Electroluminescence spectra show clear signs of direct excitons related to the optical transitions between the conduction and valence bands. Our p–n diodes can also operate as solar cells, with typical external quantum efficiency exceeding 4%. Our work opens up the way to more sophisticated optoelectronic devices such as lasers and heterostructure solar cells based on hybrids of 2D semiconductors and silicon.
310 citations
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TL;DR: In this article, a review of the most adopted strategies to enhance the sustainability of materials in classical DSSC components (e.g., sensitizer, redox couple, electrolyte and counter-electrode), including smart synthesis and deposition procedures, is presented.
230 citations
01 Jan 2003
TL;DR: In this article, the dissipated power and the directivity of antennas in a homogeneous, lossy medium were analyzed and the optimal values of the radiation energy, the directivities, and the power gain were derived.
Abstract: The dissipated power and the directivity of antennas in a homogeneous, lossy
medium are systematically analyzed in this paper. The antennas are ideal
and located inside a lossless sphere. In the lossy space outside the sphere, the
electromagnetic fields are expanded in a complete set of vector wave functions.
The optimal values of the radiation efficiency, the directivity, as well as the
power gain are derived.
75 citations
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TL;DR: In this paper, perylene tetracarboxylic acid (PTCA) was used to functionalize graphene surface and selectively introduced densely packed surface groups on graphene, which could be used to integrate ultrathin high-k dielectrics in future graphene electronics.
Abstract: We investigate Atomic Layer Deposition (ALD) of metal oxide on pristine and functionalized graphene. On pristine graphene, ALD coating can only actively grow on edges and defect sites, where dangling bonds or surface groups react with ALD precursors. This affords a simple method to decorate and probe single defect sites in graphene planes. We used perylene tetracarboxylic acid (PTCA) to functionalize graphene surface and selectively introduced densely packed surface groups on graphene. Uniform ultrathin ALD coating on PTCA graphene was achieved over large area. The functionalization method could be used to integrate ultrathin high-k dielectrics in future graphene electronics.
65 citations
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TL;DR: In this article, the performance of binary metal phosphates of NiMn(PO4)2 synthesized through sono-chemical method was investigated and the impact of capacitive and diffusive contributions to the total capacity of the device was studied by employing Dunn's model.
32 citations