Faisel EM M Tubbal

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Faisel verified their affiliation via an institutional email.

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• PhD, Telecommunications Engineering, University of Wollongong Australia
• Lecturer and Laboratories Manager at University of Wollongong

Cube satellites, aka CubeSats, are a class of tiny satellites that have become popular for space programs. This is because they can be built relatively cheaply using commercial off-the-shelf components. Moreover, CubeSats can communicate with each other, and assemble into swarms to carry out different functions; e.g., wide area measurements and sen...

Antenna design has received renewed attention in the last few years [...]

With the continuous innovations in cutting-edge engineering sciences, advancements in robotic autonomous systems (RAS) have opened up new possibilities in the mining sector, showing promise in replacing humans for various tasks. While RAS has been playing a pivotal role in developing intelligent mining machines, a timely and thorough survey of thes...

Recent advancements in wireless technology have prompted the development of wearable antennas, particularly for Wireless Body Area Networks (WBANs) used in sports, military activities, healthcare, and identification systems. Unlike traditional antennas, wearable antennas operate very close to the curved human body. Consequently, their performance m...

A highly bendable, and a low-profile Artificial Magnetic Conductor (AMC)-based antenna for wearable applications operating at 2.4 GHz is presented. The AMC is employed to ensure consistent antenna performance in both free space and on the body, with its safety limit complying with standards. The proposed AMC design incorporates a Jerusalem cross sh...

In this paper, we design and implement a multiantenna configured secure millimeter-wave (mmWave) CP-less multi-user orthogonal chirp division multiplexing (OCDM) transceiver. Our proposed simulated system emphasizes more applicable performance matrices for a typically assumed case of four users and a passive eavesdropper for audio data transmission...

Opportunistic Networks (OppNets) are characterized by intermittently connected nodes with fluctuating performance. Their dynamic topology, caused by node movement, activation, and deactivation, often relies on controlled flooding for routing, leading to significant resource consumption and network congestion. To address this challenge, we propose t...

Radio frequency energy harvesting (RFEH) and wireless power transmission (WPT) are emerging alternative energy technologies that have the potential to provide wireless energy delivery in the future. A key component of RFEH or WPT systems is the receiving antenna, which significantly impacts the power delivery capability of the system. This survey e...

With the coronavirus pandemic, companies and governments around the world have been investing millions of dollars in the development of contactless sensor technologies that minimize the need for physical interactions between patients and healthcare providers. This has led to rapid progress in healthcare research on innovative contactless technologi...

This letter presents a coplanar waveguide‐fed printed monopole antenna backed by an artificial magnetic conductor (AMC) reflector. The proposed monopole antenna achieves circular polarization by loading the monopole with a printed coil and using an asymmetric ground plane. In addition, the AMC increases the antenna gain while maintaining a wide axi...

This paper presents a novel wideband circularly polarized CPW-fed printed monopole antenna for CubeSat applications. An AMC reflector with 5×5-unit cells is used to increase antenna gain. The overall size of the antenna is 0.48λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ×0.48λ <sub xmlns:...

An ultra-wide band (UWB) linearly polarized CPW-fed printed monopole antenna is designed. The proposed antenna has a total size of 1.08λ0×1.08λ0 ×0.23λ0 operates in C-band, achieves a wide -10 dB impedance bandwidth and a high gain. To maintain the UWB feature and to enhance the radiation performance, the circular shaped patch, and the Artificial M...

Monitoring vital signs regularly helps the early recognition of abnormal physiological parameters in deteriorating patients. Impulse radio ultra-wideband (IR-UWB) technology is a suitable non-invasive approach to monitor the vital signs such as heart and breathing rates. In this technique, the IR-UWB radar antenna propagates signal towards the pati...

Due to the COVID-19, educational institutions fully or partially shifted to online teaching. Hardware-based laboratories presented a major challenge given the online learning environment. Online running of hardware-based laboratory classes using software does not provide students. Online teaching reduces the interaction level between students and d...

An abrupt surge in demand for high speed services and the advent of data-hungry frameworks such as the Internet of Things will add further to the congestion woes of the existing radio-frequency regime. Free space optical (FSO) communication technology has emerged as a promising contender to deliver high-speed data access but the performance is at t...

This book is intended to shed some light on recent advances in antenna design for these new emerging applications and identify further research areas in this exciting field of communications technologies. Considering the specificity of the operational environment, e.g., huge distance, moving support (satellite), huge temperature dri8, small dimensi...

In this article, a multiband compact patch antenna and a multiband rectifier circuit is proposed for a rectenna operating at 2.4 GHz and 5.8 GHz for RF energy harvesting and wireless power transmission. A modified inverted F shape antenna is used as the main receiving component of the rectenna. The antenna has a compact size of 35×40 mm 2 . The pro...

the topic of the present special issue, namely “Antenna Designs for 5G/IoT and Space Applications” is of crucial importance in the today and future communication systems. Antennas are important devices in the hardware, that transform guide to radiated waves or vice-versa. Their spatial extension and topology strongly determine the performances. Bot...

Application demand for faster data rates is driving the need for wider operating bandwidth of future 5G/6G communication systems which in turn poses stringent requirements on the design of suitable antennas. A candidate antenna that can support 5G/6G systems are reflectarrays (RAs) due to their numerous potentials, such as high gain, beam shaping,...

This article presents a wideband microstrip patch antenna for Ka-band CubeSat applications. The proposed antenna mainly consists of a square patch antenna printed on a grounded FR4 slab which is used as a building block. Moreover, a parasitic element and slots are added to enhance the impedance bandwidth and improve the gain, respectively. To valid...

CubeSats are a class of miniaturized satellites that have become increasingly popular in academia and among hobbyists due to their short development time and low fabrication cost. Their compact size, lightweight characteristics, and ability to form a swarm enables them to communicate directly with one another to inspire new ideas on space explorati...

This paper presents a novel antenna with its array and MIMO configuration for the 5G sub-6 GHz applications. The proposed antenna element operates at the central frequency of 5.57 GHz dedicated for Sub-6 GHz 5G communication applications. The antenna element holds a circular-shaped radiating portion with an inner-circular slot, plus a rectangular s...

This article presents a compact wideband high gain patch antenna for CubeSat. The proposed metal-only antenna mainly consists of an upper patch, a folded ramp-shaped patch and shoring pins connecting the antenna with the ground plane. By adjusting the lengths and widths of two arms of the upper F-shaped patch, a second resonant frequency is generat...

Flexible wearable wireless devices have found practical uses as their cost has fallen and Internet of Things applications have gained further acceptance. These devices are gaining further use and acceptance in the consumer and wearable space for applications such as logistical tracking and maintaining sensor information, including temperature, humi...

Free-space optical (FSO) communication systems are being anticipated to offer promising alternatives to existing radio networks in delivering high-speed data access to end-users. Ease of installation, robust features, and cost-effective operation have been the hallmark of FSO systems, and these features will play an obvious role in deciding the way...

The aim of this work is to propose a dual band millimeter wave (mmwave) MIMO antenna system for 5G technology. In addition, the arrangement of the antenna elements in an array should be in such a manner that without using the traditional decoupling structures and/or techniques, a reasonable isolation level must be achieved. To demonstrate this, a s...

Cube Satellites, aka CubeSats, are a class of nano satellites that have gained popularity recently, especially for those that consider CubeSats as an emerging alternative to conventional satellites for space programs. This is because they are cost-effective, and they can be built using commercial off-the-shelf components. Moreover, CubeSats can com...

Flexible substrates have become essential in order to provide increased flexibility in wearable sensors, including polymers, plastic, paper, textiles and fabrics. This study is to comprehensively summarize the bending capabilities of flexible polymer substrate for general Internet of Things (IoTs) applications. The basic premise is to investigate t...

Flexible substrates have become essential in order to provide increased flexibility in wearable sensors, including polymers, plastic, paper, textiles and fabrics. This study is to comprehensively summarize the bending capabilities of flexible polymer substrate for general IoT applications. The basic premise is to investigate the flexibility and ben...

Radio Frequency Identification (RFID) is the driving technology behind many compelling applications, such as smart cities, item tracking, and Internet-of-Things (IoT). However, it is always challenging to design small size, lightweight, low-cost RFID systems with low power consumption. This work presents a low-profile, lightweight, low cost, and hi...

In this paper, a low profile circularly polarized (CP) antenna with wide 3-dB axial ratio beamwidth (ARBW) is presented. Two-pair of parallel slots are etched on a circular patch and manifested as magnetic dipoles (MDs). These narrow slots are arranged symmetrically about the axes, and one pair is orthogonal to another pair of slots. The philosophy...

In this paper, a metal frame antenna is proposed for CubeSat communications. A 100mm×100mm×5mm metal frame is integrated with loop antenna on a 60mm×70mm substrate. The proposed antenna was simulated using HFSS to show its far-filed performance. The simulation results show that the antenna on CubeSat can achieve a maximum gain of 10.48dBi and dual...

Managing and delivering data packets at high frequency e.g., ≤ 28 GHz, using vehicles through delayed tolerant networks in cities is challenging. This is because of the high attenuation of high frequency signals with the presence of obstacles in cities, e.g., buildings. To address this limitation, this paper proposes the use of drones with the grou...

CubeSats as a class of tiny satellites have become more popular for initiative space-technology activities with students at universities. This is due to their small size, low cost and short development time. However, modern space capabilities of CubeSats require high performance antennas to communicate with the ground stations at the earth surface....

CubeSats have revolutionized the way scientists and students perceive space. The majority of CubeSat communication is greatly limited by the AX.25 standards, the small communication window, the available transmission power, and the available bandwidth at VHF/UHF band. As a result, CubeSat radios could only establish low data rate links which restri...

In this paper, a dual-band folded-end dipole antenna is proposed for plastic CubeSat platforms. The proposed antenna has a compact structure which is integrated in a miniaturized satellite i.e. CubeSat without any deployment mechanism. This is achieved by folding the dipole antenna around the CubeSat circumference. In addition, by folding the dipol...

Free Space Optical (FSO) communication links are although extremely vulnerable to atmospheric adversities, multi-hop relay transmission can however, significantly improve the link performance and reliability. This paper proposes 120 Gbps DP-16 QAM modulated multi-hop serial FSO link with coherent reception for delivering medical consultation servic...

In this paper, a printed Yagi antenna with an integrated balun is proposed for CubeSat communications. The printed antenna is mechanically adjustable to realize three functional states at different operating frequencies in the L-band and S-band respectively. Three different angle deployments are proposed at 10°, 50° and 90°, so that the antenna ope...

In this paper, a steerable Yagi-Uda antenna implemented on a dielectric is proposed for S-band CubeSat communications. The steerable Yagi antenna consists of 3 elements lying on an FR4 substrate that form an angle with the CubeSat’s surface. The key idea is to mechanically control the angle between the proposed antenna and the CubeSat’s surface to...

This paper provides a feasibility study of estimating the heartrate and the breathing rate, using the waveform spectrum recorded by impulse radio ultra wideband (IR-UWB) radar. An algorithm is proposed that helps to separate the heartrate signal from the breathing signal. Furthermore, a Kalman filter is introduced that helps to reduce the noise fac...

This paper analyzes the bending effects of Flexible Chip-less Bow-Tie RFID tag, which is designed and fabricated on three different polymer substrates, Polyethylene terephthalate (PET), Polytetrafluoroethylene PTFE (TEFLON) and Polyvinyl Chloride (PVC). The tag uses Frequency Selective Surface (FSS) approach and operates within the frequency range...

This paper proposes a dual band CPW-fed slot antenna design for wireless network applications which operates at 4.9 GHz (X-band) and 7.7 GHz (C-band). The main idea is to embed two symmetrical F-shaped slits to generate a second resonant frequency. The measured results show that the antenna achieves a -10 dB bandwidths of 500 MHz at 4.9 GHz and 400...

Drones have become prevalent for the delivery of goods by many retail companies such as Amazon and Dominos. Amazon has an issued patent that describes how drones scan and collect data on their flyovers while dropping off packages [1]. In this context, we propose a path optimization algorithm for a drone multi-hop communications network that can car...

In this paper, a novel Flexible Chip-less Bow-Tie RFID tag is introduced, and its design, fabrication, testing and comparative analyses are presented. The tag uses the Frequency Selective Surface (FSS) approach with a frequency ranging from 4 to 18 GHz. The Bow-Tie design was compared an Octagonal shaped tag already published in the art. They were...

With the rapid growth of miniaturized devices for space missions, CubeSats as small satellites are becoming more and more popular. Their reduced development time, launch cost, and small size made them very attractive for the challenging environment of space. However, communication between CubeSats and the earth request the development of high-data-...

In this paper, we have proposed a high gain CPW-fed slot antenna with 2D Metamaterial (or Metasurface) for CubeSats. The main idea is the use of 2D Metamaterial above the slot antenna to redirect the back lobe forward and hence improve the total gain. It also minimizes the interference with components inside CubeSat. The use of 2D Metamaterial has...

A metasurface superstrate structure (MSS) is highly useful for improving the performance of planar antennas and reducing their size due to their unique electromagnetic properties. In this research article, a very small microstrip patch antenna (MPA) with MSS is proposed and analyzed using ANSYS HFSS to operate at 8.20 GHz for ultra small satellites...

Works on CubeSat Satellites (CubeSats) have gained momentum recently because of its fabrication using commercial off-the-shelf components. Another advantage of CubeSats is that they can form swarms to interact with each other via cross-link communications to carry out different functions such as enhancing the contact time with base stations and pro...

In this paper we present a high gain multiband patch antenna array (PAA) for 3U and 6U CubeSats. The parasitic elements (PEs) are incorporated to enhance the antenna total gain and to achieving good impedance matching. We have simulated the proposed antenna in the High Frequency Structure Simulator (HFSS). Our results show that the proposed antenna...

Wireless communication technologies are revolutionizing the way of traditional communication. Moreover, the growth from 1G to 5G is phenomenal. Internet of Everything has created a huge impact on the people’s lifestyle. Expectations of more data rates with enhanced reliability gave rise to Multiple Input Multiple Output. The pulse shaping filters p...

Carrier Frequency Offset (CFO) is the main cause of the interference among the carriers leading to the Inter Carrier Interference (ICI). CFO is one of the drawbacks in orthogonal frequency division multiplexing (OFDM) which limits its performance and bandwidth efficiency and needs to be mitigated. OFDM system incorporated with multiple input multip...

With the introduction of electronic form of data, the need for an automatic system of security to protect the integrity of data while being transferred from one place to another is required. This is especially the case for a network in which the systems are accessed over a public network or internet. Security mechanisms involve the use of more than...

With the introduction of electronic form of data, the need for an automatic system of security to protect the integrity of data while being transferred from one place to another is required. This is especially the case for a network in which the systems are accessed over a public network or internet. Security mechanisms involve the use of more than...

Orthogonal Frequency Division Multiplexing (OFDM) being used as two layers specifically in wireless interoperability for microwave access (WiMAX) i.e. Physical layer (PHY) and MAC layer and we considered PHY layer having scalable OFDM based Multiple access (OFDMA) due to empowering achievable usage of multiple antenna systems, for example, Multiple...

Diverse methodologies of Diversity combining schemes are used for performance improvements of Filter Bank Multicarrier (FBMC) by using Additive White Gaussian Noise and Rayleigh channels. These diversity combining schemes are Maximum Ratio combining and Selection Combining. The proposed schemes are implemented by using different channels of MIMO me...

With the development of miniaturization technologies, a new class of tiny satellites has emerged with mass less than 1.3Kg: Cube satellites (CubeSats). They can be built using commercial off-the-shelf components. They can also form swarms to communicate with each other via cross link communications to carry out different functions such as increasin...

Diverse methodologies of Diversity combining schemes are used for performance improvements of Filter Bank Multicarrier (FBMC) by using Additive White Gaussian Noise and Rayleigh channels. These diversity combining schemes are Maximum Ratio combining and Selection Combining. The proposed schemes are implemented by using different channels of MIMO me...

Orthogonal Frequency Division Multiplexing (OFDM) being used as two layers specifically in wireless interoperability for microwave access (WiMAX) i.e. Physical layer (PHY) and MAC layer and we considered PHY layer having scalable OFDM based Multiple access (OFDMA) due to empowering achievable usage of multiple antenna systems, for example, Multiple...

A wideband S-band F-shaped patch antenna is proposed for CubeSats communications. To broaden bandwidth, it uses two arms with different lengths to generate a second resonant frequency. The effect of the arm length and width on the return loss, resonant frequency and impedance bandwidth on a 3U CubeSat is studied. The simulation results show that th...

CubeSats are attracting interest from both the industry and academia because of their affordability. Specifically, they are made from commercial Off-The-Shelf (COTS) electronic circuit chips, and are thus seen as a cost effective replacement for traditional, expensive satellites. Moreover, they are expected to have higher capabilities to better sup...

This paper studies the suitability of shorted patch and CPW-feed square slot antennas for CubeSat communications. To study the effect of the CubeSat body on the antennas performance, we have simulated both antennas in the High Frequency Structure Simulator (HFSS) with and without the CubeSat body. Compared to CPW-feed square slot antenna, the short...

Works on pico-satellites have gained momentum recently, especially those that consider pico-satellites as part of a much larger constellation or swarm. This feature allows pico-satellites to provide high temporal resolution of observational data and redundancy. In particular, it reduces the need for satellite-to-ground communications and, hence, he...

In this paper we present the design and the analysis of Telemetry, Tracking and Command Subsystem (TT&CS) for Libyan imaging mini-satellite (LibyaSat-1). This subsystem is the brain and the operating system of any satellite or spacecraft as it performs three important functions; tracking mini-satellite position, monitoring mini-satellite health and...

In this paper we present the conceptual design of Libyan remote sensing satellite (LibyaSat-1) and its subsystems requirements. LibyaSat-1 is a 300 kg mini satellite, which will be used to support high resolution multi-spectral earth imaging camera to fulfill the civilian needs. This satellite will operate at LEO of 775 km and will provide a resolu...

CubeSats have a wet mass ranging from 1.3 (1U) to 6 kg (3U) and employ commercial off-the-shelf electronics [1]. A key advantage of CubeSats is that they are small, lightweight and have the ability to form a constellation of cube satellites that communicate directly with one another [2]. To this end, CubeSats require a cross-link communication ante...

Inter-CubeSat communications or satellite to satellite communications is very critical as it enables an efficient networking between CubeSats in a swarm [1, 2]. We propose a Low Earth Orbit (LEO) inter-CubeSat DTN architecture. DTN is a networking paradigm intended to offer data communication services according to store-and-forward mechanism in spa...

In this paper we study and evaluate shorted patch and CPW-feed square slot antennas, both of which we deem suitable for use in inter pico satellite communications in terms of gain, bandwidth and size. We have simulated both antennas in the High Frequency Structure Simulator (HFSS). Our results show that the shorted patch antenna achieves higher gai...

In this paper we study and evaluate shorted patch and CPW-feed square slot antennas, both of which we deem suitable for use in inter pico satellite communications in terms of gain, bandwidth and size. We have simulated both antennas in the High Frequency Structure Simulator (HFSS). Our results show that the shorted patch antenna achieves higher gai...