Saqer Aljaafreh

Saqer Aljaafreh
Mu’tah University · Electrical Engineering Department

About

63
Publications
16,152
Reads
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528
Citations
Citations since 2016
38 Research Items
493 Citations
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2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100

Publications

Publications (63)
Article
This paper proposes a fully automated vision-based system for real-time COVID-19 personal protective equipment detection and monitoring. Through this paper, we aim to enhance the capability of on-edge real-time face mask detection as well as improve social distancing monitoring from real-live digital videos. Using deep neural networks, researchers...
Article
Full-text available
Due to the limited space and large mutual coupling levels, the design of sub-6 GHz massive Multi-Input Multi-Output (m-MIMO) smartphone antenna system attracts antennas' designers and engineers worldwide. Therefore , this paper presents 18-element m-MIMO antenna system that covers the long-term evolution 42 (LTE42) frequency band (3.4-3.6 GHz) for...
Preprint
Full-text available
The use-case diagram is a software artifact. Thus, as with any software artifact, the use-case diagrams change across time through the software development life cycle. Therefore, several versions of the same diagram are existed at distinct times. Thus, comparing all use-case diagram variants to detect common and variable use-cases becomes one of th...
Article
Full-text available
The use-case diagram is a software artifact. Thus, as with any software artifact, the use-case diagrams change across time through the software development life cycle. Therefore, several versions of the same diagram are existed at distinct times. Thus, comparing all use-case diagram variants to detect common and variable use-cases becomes one of th...
Article
Full-text available
In this work, 2‐element slot‐based frequency reconfigurable (FR) multiple‐input‐multiple‐output (MIMO) antenna design antenna with a very wide‐sweep is proposed for dynamic spectrum sharing (DSS) in 5G technologies. FR is achieved using varactor diode with frequency tuning range from 1655 to 2605 MHz. The design is a low profile with planar structu...
Article
Full-text available
A self-isolated 10-element antenna array operating in the long-term evolution 42 (LTE42) frequency band is proposed for 5G massive MIMO smartphone applications. The proposed antenna elements are placed in a 2D array configuration; they are placed symmetrically along the two long edges of the mobile chassis. The proposed antenna structure is a short...
Article
A low profile and compact (26×13×4 mm3) folded strip monopole antenna is proposed for multiband mobile phone applications. The antenna simply consists of a main strip (folded monopole) coupled with an inner split ring resonator. To offer both compactness and multiband, the inner rings are edge-coupled with the main strip. The design covers applicat...
Article
This paper aims at combining machine learning techniques with Smartphone sensors (i.e. accelerometer sensor) to develop a smart model capable of classifying vehicle driving style into (Excellent, good or weak) categories. In this paper, we use several machine learning algorithms (Neural network, KNN, Naïve Bayes and Random forest tree) to train and...
Article
A low-profile microwave holographic antenna comprised of a dual-metasurface and an integrated printed Yagi feed is presented. The proposed design utilizes two metasurfaces with an aperture size of 0.0134 m2, with no ground plane, to produce a single pencil beam normal to the plane of the Yagi feed. The holographic antenna is designed at a centre fr...
Article
Full-text available
A new, hybrid, nona‐band antenna of the size 80 × 8 × 5 mm³ is proposed for recent metal‐rimmed smartphone applications. The proposed design is composed of a metallic frame (external antenna) and an internal radiating structure. The proposed antenna is attached to the top part of the smartphone. It uses a microstrip feed as a direct coupling line f...
Article
A low-profile microwave holographic antenna comprised of a dual-metasurface and an integrated printed Yagi feed is presented. The proposed design utilizes two metasurfaces with an aperture size of 0.0134 m², with no ground plane, to produce a single pencil beam normal to the plane of the Yagi feed. The holographic antenna is designed at a centre fr...
Article
Indoor localization and tracking systems are harvesting more attention from the researchers. Recently, several approaches for localization systems have been proposed that use the sensors which are available on smartphones. In this paper, a new filtering approach based on Hidden Markov Model (HMM) techniques to enhance the accuracy of the localizati...
Article
Full-text available
A low-cost inkjet printing method for antenna fabrication on a polyethylene terephthalate (PET) substrate is presented in this paper. An office inkjet printer is used to have desired patterns of silver nanoparticle ink on the PET substrate without any postprocessing. Silver nanoparticle ink cures instantly as soon as it is ejected from the printer...
Article
Full-text available
This article describes design of four types of wearable dual band (2.444 and 5.4 GHz) planar patch antennas. The first one is designed on a traditional ground plane. The other three are designed on three different types of two-dimensional artificial ground planes. The traditional ground plane based antenna has a bandwidth of 81.6 and 161.8 MHz at 2...
Conference Paper
A new low-profile dual-element antenna is proposed for hexa-band Smartphone MIMO applications. It consists of two antenna structures in which, each one excite orthogonal characteristic mode to achieve isolation very easily below 1 GHz. Both elements (the metal frame antennas and the internal PILA antenna) are is analyzed and optimized in terms of t...
Article
Full-text available
It has been shown that the correlation between the radiation patterns of two antennas can be measured in a reverberation chamber (RC). In this paper, it is shown that the self-correlation coefficient of an antenna, defined as the correlation between the radiation pattern of an antenna under test (AUT) and a transformed version of itself, can also b...
Article
Full-text available
A simple planar inverted-f antenna for universal serial bus dongles covering the frequency from 1.6 GHz to more than 3.6 GHz in a single band is presented in this paper. The height of the planar inverted-f antenna is only 3 mm and the dimensions of the ground plane are set equal to the usual size of a universal serial bus dongle (20 mm × 55 mm). Fo...
Article
Full-text available
Recently, a significant amount of research attention has been given to monitoring the road surface anomalies such as potholes and speed bumps. In this paper, speed bump detection method based on a fuzzy inference system (FIS) is proposed. The fuzzy inference system detects and recognizes the speed bumps from the variance of the vertical acceleratio...
Conference Paper
A compact multiple input multiple output (MIMO) antenna system of four-element planar inverted-L antenna (PILA). The antenna elements are installed along the corners of a PCB board. To mitigate the mutual coupling effect, compact parasitic decoupling elements are used between elements. The design covers a very wide 6dB return loss bandwidth (1700-3...
Conference Paper
Full-text available
This paper presents a new two-element multiple input multiple output (MIMO) antenna for LTE application using an unbroken metallic rim as the primary antenna and a non- resonant capacitive coupling element (CCE) as a diversity antenna. The primary antenna covers 698-960 MHz and 1710-2690 MHz and the diversity antenna cover 1710-2690 MHz Average eff...
Article
Liquid antennas have attracted increasing attentions recently. In this paper, a promising candidate for liquid antennas, namely water with propylene glycol (PG), is investigated using both measurement and numerical simulation approaches. The nonlinear least-squares fitting routines are employed to derive new formulae for the approximation of the co...
Article
In this paper, a compact, frequency reconfigurable antenna with a wide tuning range is proposed. It consists of a folded monopole structure, a transparent dielectric loading, and a varactor diode. The use of a water layer and a holder as the transparent dielectric loading can effectively reduce the antenna size, while keeping the antenna with a rea...
Article
Full-text available
An ultra-compact water loaded, 3D reconfigurable antenna is presented for digital video broadcasting-handheld (DVB-H) and ultra-high frequency (UHF) applications. By integrating a varactor diode, the operating frequency of this antenna can be continuously tuned from 463 to 900 MHz. A mixture of the water and water holder is effectively utilised as...
Article
A low profile (height = 3 mm) and wideband dual coplanar feed planar inverted-F antenna (PIFA) is proposed for diversity applications over the frequency range of 2.35–3.25 GHz with a fractional bandwidth of 32%. It covers LTE bands 7, 38, 40, 41 and WiFi frequency bands. The design is based on a comparative study on the mutual coupling between diff...
Article
In this article, a wideband, hybrid rectangular water antenna is proposed to cover the digital video broadcasting-handheld (DVB-H) band. The hybrid structure combines a dielectric resonator antenna (DRA) and a monopole antenna to effectively double the available bandwidth without compromising other characteristics. With a proper design, the resonan...
Article
Full-text available
A low profile (height = 3 mm) and wideband dual coplanar feed planar inverted-F antenna (PIFA) is proposed for diversity applications over the frequency range of 2.35 – 3.25 GHz with a fractional bandwidth of 32%. It covers LTE bands 7, 38, 40, 41 and WiFi frequency bands. The design is based on a comparative study on the mutual coupling between di...
Article
Full-text available
A new wideband hybrid antenna is proposed in this paper. It combines an F-shaped conducting monopole antenna and a water dielectric resonator antenna (DRA) to effectively broaden the antenna bandwidth. The F-shaped monopole is also used to excite the water DRA. The unique features of water, such as transparency and liquidity, allow complex feeding...
Conference Paper
Full-text available
Water antennas are a special type of liquid antennas and have attracted increasing attentions recently. In this paper, novel water antenna designs with different working mechanisms are presented. The achievable performance of water antennas designed for wide bandwidth, compactness, low profiles are illustrated. The water based antenna can be a cond...
Article
Full-text available
Water antennas are a special type of antennas and have attracted limited attention so far. In this study, a monopole water antenna with a dielectric layer is chosen as an example to study some less obvious characteristics of the water antenna. The resonant frequency, radiation efficiency and fractional bandwidth are of particular interest. Firstly,...
Article
Full-text available
A low profile (5 mm) and wideband planar inverted-L antenna (PILA) is proposed for handset diversity and MIMO applications. It occupies a footprint area of 702 (= 351×2) mm2 over the ground plane and consists of two elements arranged utilizing both pattern and spatial diversities to provide a reasonable isolation level. The radiators consist of mod...
Article
Full-text available
A new method is proposed in this paper to measure the diversity gain of a multiple-input and multiple-output (MIMO) antenna system using a reverberation chamber (RC). The traditional method for this type of measurement requires the MIMO antenna under test (AUT) and also two extra antennas: a transmit antenna and a reference antenna with known radia...
Article
Full-text available
This study aims to simplify the diversity gain measurement in a reverberation chamber since the conventional method requires two extra antennas: a transmitting antenna and a reference antenna with known radiation efficiency. By incorporating the one- or two-antenna method for the radiation efficiency measurement in a reverberation chamber and takin...
Article
Full-text available
A new Multi-Input Multi-Output (MIMO) antenna using two modified planar inverted-F antennas (PIFA) is presented in this paper. Both modified PIFA antennas are identical with each having two shorting plates instead of one shorting plate and a slot on the top radiation plate for impedance matching to increase the bandwidth of the antennas. Two slots...
Article
Full-text available
This work presents a new simple low-profile and compact planar inverted-E antenna (PIEA) which is a modified form of planar inverted-F antenna having two shorting plates instead of one. A slot is inserted on the ground plane to further enhance the impedance bandwidth of this antenna. This PIEA covers the frequency band from around 1700 MHz to more...
Conference Paper
THz photoconductive material is one of the intensely studied topics in the THz field. The effect of substrate thickness on the radiated THz power had been studied by various researchers. In this paper also, THz antenna performances using different substrate material are compared and discussed. It has been shown that the thinner substrate used and t...
Conference Paper
In this paper, a low profile, broadband, dielectric resonant antenna (DRA) with a U-shaped water layer is presented for DVB-H (470 - 862 MHz) mobile applications. The U-shaped water layer is used as a radiator to reduce the antenna size. The proposed antenna has a -6 dB impedance bandwidth from 461 to 1019 MHz, or a fractional bandwidth of 75%, and...
Article
Full-text available
This paper presents a simple low profile modified form of PIFA with two shorting stubs. Two shorting plates and a slot on the top radiating plate are used to do impedance matching for enhancing the impedance bandwidth of the antenna. This modified planar inverted-F antenna covers the frequency band from 1650 MHz to around 2600 MHz in a single band...
Conference Paper
Full-text available
A new wideband, very low profile (3 mm), PIFA antenna is proposed. It utilizes two collinear feeds, ground plane slots and modified top radiating plate to reduce the mutual coupling between the feeds and improve the impedance matching. The proposed antenna has a 10-dB impedance bandwidth from 2.25 to 3.2 GHz or a fractional bandwidth of 35 %. It co...
Article
Full-text available
This letter presents a very simple low-profile and compact single-element two-port planar inverted-F antenna (PIFA) with applications in Wireless Local Area Networks (WLAN) and Long Term Evolution (LTE) bands. The two feeding plates are placed perpendicular to each other where polarization diversity is exploited due to the fact that the two ports a...
Conference Paper
Full-text available
A dual-feed, water-based dielectric resonant antenna (DRA) is proposed for hand portables. It works over 2.4 to 3.34 GHz to cover 2.43 GHz WLAN, Bluetooth, three LTE bands (band 7, band 38 and band 41) and 2.63 S-DMB band. A ground defect structure is employed to provide a decoupling path between the antenna ports, and at the same time it increases...
Conference Paper
Full-text available
A new single element Planar Inverted-F Antenna (PIFA) with two ports is presented in this papers. By placing the two feeding plates perpendicular to each other, polarization diversity is employed using one common radiating plate with successful provision of two isolated feeding ports. Isolation between the two ports is achieved by introducing a slo...
Conference Paper
Full-text available
In this paper, a novel U-shaped dielectric resonant antenna (DRA) with a small size but wide bandwidth is introduced. The antenna is made of a very high permittivity material (εr = 81) and has a novel shape that supports multimode. The size of the proposed antenna is smaller than other DRAs published for the frequency bands 2.4 GHz-3.0 GHz while th...
Conference Paper
Full-text available
A monopole water antenna with a relative permittivity of 81 and a variable conductivity has been studied. Three issues are addressed in the paper. Firstly, the relationship between the conductivity and antenna radiation efficiency is investigated. Secondly, a new feeding design for the water antenna is proposed and a good return loss, radiation eff...

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