Dr. Negin Shariati is a Senior Lecturer at UTS and Deputy Director of the RF and Communications Technologies Lab (RFCT). She established the state of the art RFCT research lab in 2018 where she leads research in RF and microwave circuits, RF energy harvesting, wireless power transmission, and self-powered electronics for IoT. She is responsible for defining the research direction and strategy of the lab and equipping RFCT with world-class RF design, fabrication and measurement facilities. Dr Negin Shariati is also a visiting Lecturer at Hokkaido University since 2018, externally engaging with research and teaching activities in Japan.
She completed her PhD in Electronics and Communication Technologies at Royal Melbourne Institute of Technology (RMIT), Australia, in 2016. She worked in industry as an Electrical-Electronic Engineer from 2008-2012.
Negin was the recipient of the IEEE Victorian Section Best Research Paper Award 2015, RMIT Higher Degree by Research (HDR) Publication Grant 2015, the Boeing Scholarship 2013, Research Paper Grants at European Microwave Conferences 2012, 2014 and 2015, the Best Oral Presentation Prize at European Microwave Conference, the Best Oral Presentation Prize at RMIT HDR Conference 2012, and RMIT Postgraduate Research Scholarship. She was recognised as the high performing teaching staff in 2016, School of Engineering, RMIT University.
- Reviewer of IEEE Transactions on Microwave Theory and Techniques, IEEE Transactions on Antennas and Propagations and Nature Scientific Reports.
- Member of IEEE, MTTs (Microwave Theory and Technique Society)
Can supervise: YES
Radio Frequency (RF) energy harvesting has experienced a rapid development in recent years due to the increasing number of RF transmitter sources producing an abundant ambient microwave energy waste. Furthermore, the development of wireless power transmission (WPT) technologies has triggered impetus for RF energy harvesting. Hence, RF energy scavenging is a promising solution as it has the potential to provide a sustainable energy source to meet upcoming demands.
Efficient ambient RF energy scavenging is a very challenging issue, as it deals with the low RF power levels available in the environment. The scavengeable power levels are generally unknown and can vary unpredictably; therefore sparking research interest to develop highly sensitive RF energy scavengers to capture ambient RF signals over a range of low input power levels.
My research focuses on a real life RF energy scavenging approach to generate electrical power in urban environments.
My current research areas include:
RF energy harvesting circuits and systems, Wireless RF power transmission, Self-powered electronic systems for IoT, Simultaneous wireless information and power transfer (SWIPT), and Renewable energy systems.
Current: Wireless Sensor Networks, Electronics and Circuits
Previous: Electronics Studios, Microwave Circuit Design, Communication Engineering, Radar Systems, Signals and Systems, Engineering Methods, Mathematics, Networking Essentials
Tofigh, F, Amiri, M, Shariati, N, Lipman, J & Abolhasan, M 2020, 'Crowd Estimation Using Electromagnetic Wave Power-Level Measurements: A Proof of Concept', IEEE Transactions on Vehicular Technology, vol. 69, no. 1, pp. 784-792.View/Download from: Publisher's site
Tofigh, F, Amiri, M, Shariati, N, Lipman, J & Abolhasan, M 2020, 'Polarization-Insensitive Metamaterial Absorber for Crowd Estimation Based on Electromagnetic Energy Measurements', IEEE Transactions on Antennas and Propagation, vol. 68, no. 3, pp. 1458-1467.View/Download from: Publisher's site
© 2020 IEEE. Noninvasive crowd estimation has remained a challenging issue among researchers. Methods such as image analysis and Wi-Fi/Bluetooth probing can always be used to identify and track people. Lately, authors have introduced a noninvasive method for crowd estimation based on ambient RF energy measurements. In this article, a polarization-insensitive multilayer metamaterial absorber is introduced to measure the variation in the available RF energy levels for crowd estimation purposes. The proposed dual-band absorber is designed to absorb and transfer the maximum of the available Wi-Fi energy to a lumped element to enable proper and accurate measurements. To evaluate the design, the proposed structure is fabricated as an array, and its performance is tested, proving perfect absorption at the desired frequencies, 2.4 and 5 GHz.
Zhou, I, Lipman, J, Abolhasan, M, Shariati, N & Lamb, DW 2020, 'Frost Monitoring Cyber-Physical System: A Survey on Prediction and Active Protection Methods', IEEE INTERNET OF THINGS JOURNAL, vol. 7, no. 7, pp. 6514-6527.View/Download from: Publisher's site
Heidary, A, Radmanesh, H, Bakhshi, A, Samandarpour, S, Rouzbehi, K & Shariati, N 2020, 'Compound ferroresonance overvoltage and fault current limiter for power system protection', IET Energy Systems Integration.View/Download from: Publisher's site
Heidary, A, Radmanesh, H, Naghibi, SH, Samandarpour, S, Rouzbehi, K & Shariati, N 2020, 'Distribution system protection by coordinated fault current limiters', IET Energy Systems Integration, vol. 2, no. 1, pp. 59-65.View/Download from: Publisher's site
Amiri, M, Tofigh, F, Shariati, N, Lipman, J & Abolhasan, M 2019, 'Miniature tri-wideband Sierpinski-Minkowski fractals metamaterial perfect absorber', IET Microwaves, Antennas and Propagation, vol. 13, no. 7, pp. 991-996.View/Download from: Publisher's site
© The Institution of Engineering and Technology 2019. With rapidly growing adoption of wireless technologies, requirements for the design of a miniature wideband multiresonators are increasing. In this study, a compact fractal-based metamaterial structure with lumped resistors is described. The structure of the authors proposed absorber is a combination of Sierpinski curve and Minkowski fractal. The new combination provides larger capacitance and inductance in the system enabling perfect absorption at lower frequencies. The final structure with dimensions of 20 × 20 × 1.6 mm3 and an air gap of 12.5 mm provides three main resonances at frequencies of 2.1, 5.1, and 12.8 GHz with bandwidth (absorption ratio over 90%) of 840 MHz, 1.05 GHz, and 910 MHz, respectively.
Tofigh, F, Amiri, M, Shariati, N, Lipman, J & Abolhasan, M 2019, 'Low-Frequency Metamaterial Absorber Using Space-Filling Curve', Journal of Electronic Materials, vol. 48, pp. 6451-6459.View/Download from: Publisher's site
The extensive use of metamaterials and metamaterial absorbers increases the demand for compact structures in various frequencies. Designing electrically small absorbers for lower frequencies, especially sub-gigahertz applications, is one of the open issues in this field. In this paper, a space filling curve is used to design an absorber operating on low frequencies. The unit cell design is based on a Sierpinski curve with the size of 25×25×1.6mm3 and air-gap of 10 mm. The structure shows 99.9% absorption at 900 MHz on the third step. The system also shows multiple resonances due to its structure. The proposed structure is fabricated and tested and shows a good agreement with simulation results.
Ansari, M, Zhu, H, Shariati, N & Guo, YJ 2019, 'Compact Planar Beamforming Array with Endfire Radiating Elements for 5G Applications', IEEE Transactions on Antennas and Propagation, vol. 67, no. 11, pp. 6859-6869.View/Download from: Publisher's site
In this paper, a compact 4×6 Butler matrix (BM) based on microstrip lines is designed and applied to a linear antenna array. The proposed design creates four beams in four different directions within the 27.5 and 28.5 GHz band. One of the advantages of this BM is a reduction in the size of the beamforming network (BFN). In order to attain this objective, the basic microstrip-based 4×4 BM is designed, and then modified to a 4×6 BM through a dual-substrate structure to avoid crossing lines using microstrip-to-slotline transitions. The BFN is cascaded with a six-element linear antenna array with endfire radiating elements. The array can be conveniently integrated into the BFN. The resulting design benefits from low-loss characteristics, ease of realization, and low fabrication cost. The array is fabricated and tested, and the experimental results are in good agreement with the simulated ones. The multi-beam antenna size is 5.6 λ × 4.6 λ including feed lines and feed network, while the new BM design is only 3.5λ0 × 1.4λ0 , which is almost half as large as the traditional one. The measured radiation patterns show that the beams cover roughly a spatial range of 90° with a peak active gain of 11 dBi.
Rouzbehi, K, Miranian, A, Escaño, JM, Rakhshani, E, Shariati, N & Pouresmaeil, E 2019, 'A Data-Driven Based Voltage Control Strategy for DC-DC Converters: Application to DC Microgrid', Electronics, vol. 8, no. 5, pp. 493-493.View/Download from: Publisher's site
This paper develops a data-driven strategy for identification and voltage control for DC-DC power converters. The proposed strategy does not require a pre-defined standard model of the power converters and only relies on power converter measurement data, including sampled output voltage and the duty ratio to identify a valid dynamic model for them over their operating regime. To derive the power converter model from the measurements, a local model network (LMN) is used, which is able to describe converter dynamics through some locally active linear sub-models, individually responsible for representing a particular operating regime of the power converters. Later, a local linear controller is established considering the identified LMN to generate the control signal (i.e., duty ratio) for the power converters. Simulation results for a stand-alone boost converter as well as a bidirectional converter in a test DC microgrid demonstrate merit and satisfactory performance of the proposed data-driven identification and control strategy. Moreover, comparisons to a conventional proportional-integral (PI) controllers demonstrate the merits of the proposed approach.
Abolhasan, M, Abdollahi, M, Ni, W, Jamalipour, A, Shariati, N & Lipman, J 2018, 'A Routing Framework for Offloading Traffic from Cellular Networks to SDN-based Multi-Hop Device-to-Device Networks', IEEE Transactions on Network and Service Management, vol. 15, no. 4, pp. 1516-1531.View/Download from: Publisher's site
IEEE Device-to-Device (D2D) Communications are set to form an integral part of future 5G wireless networks. D2D communications have a number of benefits such as improving energy efficiency and spectrum utilization. Until now much of the D2D research in LTE and 5G-type network scenarios have focused on direct (one-hop) communications between two adjacent mobile devices. In this paper, we propose a new routing framework called Virtual Ad hoc Routing Protocol (VARP). This framework introduces significant advantages such as better security, lower routing overheads, and higher scalability, when compared to conventional ad hoc routing protocols. It also reduces traffic overhead in LTE networks using multi-hop D2D communications under management of a SDN-controller. Further, it enables the development of various types of routing protocols for different networking scenarios. To this end, a source-routing based protocol was developed on top of VARP, referred to as VARP-S. We present a detailed analytical study of routing overhead in the VARP-S protocol, as compared to overhead analysis of our previous proposed Hybrid SDN Architecture for wireless distributed networks (HSAW)IEEENetworkMehran. Our results show that VARP-S, compared to HSAW, achieves higher network scalability and lower power consumption for mobile nodes.
Rouzbehi, K, Yazdi, SSH & Moghadam, NS 2018, 'Power Flow Control in Multi-Terminal HVDC Grids Using a Serial-Parallel DC Power Flow Controller', IEEE ACCESS, vol. 6, pp. 56934-56944.View/Download from: Publisher's site
Shariati, N, Scott, JR, Schreurs, D & Ghorbani, K 2018, 'Multi-tone Excitation Analysis in RF Energy Harvesters -Considerations and Limitations', IEEE Internet of Things Journal, vol. 5, no. 4, pp. 2804-2816.View/Download from: Publisher's site
The effect of multitone excitation on the dc response of a voltage-doubler radio frequency energy harvester is analyzed. Theoretical analysis as well as frequency and time domain (TD) simulations were conducted to clarify the findings. Measurements were also carried out to validate the results. The measured, simulations and theoretical results are in good agreement. This paper focuses on evaluating the performance of a voltage doubler rectifier under multitone excitation (input power is the same in the single-tone and multitone case). Based on TD and harmonic balance simulations, theoretical and measurement analyses, it is evident that the application of multiple tones simultaneously within the matched frequency band and with the same average available power results in a lower average output dc power when compared with the single-tone case with the same input power. This trend is evident over a broad low input power range of -50 to -10 dBm (0.01-100 μW).
Amiri, M, Tofigh, F, Shariati, N, Lipman, J & Abolhasan, M 2020, 'Ultra Wideband Dual Polarization Metamaterial Absorber for 5G frequency spectrum', 14th European Conference on Antennas and Propagation, EuCAP 2020.View/Download from: Publisher's site
© 2020 EurAAP. Implementing 5G technology contributes to improve communication quality and facilitate several interesting applications in daily life such as Internet of things. Despite outstanding features of 5G, the amount of ambient electromagnetic waves will be increased significantly in the environment, which may be undesired. Ultra-wideband metamaterial perfect absorber is a promising solution to collect these undesired signals. Using lumped elements in absorber structure to increase the absorption bandwidth leads to design and fabrication process complexity. In this paper, a low profile polarization angle selective metamaterial absorber has been designed to absorb signals in the frequency range of 21.79 GHz to 53.23 GHz with more than 90% efficiency. The relative absorption bandwidth of the final structure is 83.81%. Moreover, the final structure is reasonably insensitive facing different incident angle up to 40 degree.
Ian Zhou, Negin.Shariati 2020, 'A Blockchain-based File-sharing System for Academic Paper Review', IEEE International Conference on Signal Processing and Communication Systems, ICSPCS, IEEE, Australia.View/Download from: Publisher's site
Abdollahi, M, Abolhasan, M, Shariati, N, Lipman, J, Jamalipour, A & Ni, W 2019, 'A Routing Protocol for SDN-based Multi-hop D2D Communications', 2019 16th IEEE Annual Consumer Communications and Networking Conference, CCNC 2019, EEE Annual Consumer Communications & Networking Conference, IEEE, USA, pp. 895-898.View/Download from: Publisher's site
© 2019 IEEE. This paper presents a new Multi-hop Device-to-Device (MD2D) routing protocol, referred to as SMDRP (SDN-based Multi-hop D2D Routing Protocol), for SDN-based wireless networks. Our proposed protocol can be considered as a semi-distributed routing protocol, where an SDN controller manages and controls part of the overall MD2D routing functionality to increase scalability while enabling network operators to control and maintain the out-of-band packet forwarding network. This paper also extends prior work on the Hybrid SDN Architecture for Wireless Distributed Networks (HSAW)  and is adapted to the framework presented in this paper. In HSAW, since all link state information is flooded by the controller to the nodes, the network will experience scalability problem. In our approach, this problem is overcome by only passing the next hop for each active route to the mobile nodes. To investigate this, we performed a theoretical and simulation studies comparing HSAW with SMDRP. From our result, it can be seen that for larger density populated networks, SMDRP shows better scalability than HSAW. In addition, mobile nodes need less memory and energy for their communications.
Chehrazad, S, Aghdasi, HS, Shariati Moghadam, N & Abolhasan, M 2017, 'Addressing coverage problem in wireless sensor networks based on evolutionary algorithms', 2017 23rd Asia-Pacific Conference on Communications (APCC), Asia-Pacific Conference on Communications, IEEE, Perth, WA, Australia.View/Download from: Publisher's site
Wireless Sensor Networks (WSNs) are the key part of Internet of Things, as they provide the physical interface between on-field information and backbone analytic engines. An important role of WSNs-when collecting vital information-is to provide a consistent and reliable coverage. To Achieve this, WSNs must implement a highly reliable and efficient coverage recovery algorithm. In this paper, we take a fresh new approach to coverage recovery based on evolutionary algorithms. We propose EMACB-SA, which introduces a new evolutionary algorithm that selects coverage sets using a fitness function that balances energy efficiency and redundancy. The proposed algorithm improves network's coverage and lifetime in areas with heterogeneous event rate in comparison to previous works and hence, it is suitable for using in disaster management.
Shariati, N, Rowe, WST & Ghorbani, K 2015, 'Highly sensitive FM frequency scavenger integrated in building materials', Proceedings of the European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC, European Microwave Conference, IEEE, Paris, France, pp. 68-71.View/Download from: Publisher's site
© 2015 EuMA. Due to the abundance of ambient RF (Radio Frequency) energy, considerable research effort has been invested in RF energy scavenging. In this paper, we propose a rectifier which can be embedded into the building materials to provide a sustainable energy source in urban environments. The power will be available through DC sockets with different voltage settings. A highly sensitive and efficient rectifier operating at the FM frequency band is proposed which exhibits favorable impedance matching over a broad low input power range of-50 to-20 dBm (0.01 to 10 μW). Measurement results of input reflection coefficient and rectified output power are provided. An output DC power of around 11 μW is achieved from concurrently rectifying six tones of-20 dBm, providing a viable perpetual energy source for low power applications.
Bojovschi, A, Shariati, N & Ghorbani, K 2013, 'Analysis of a carbon fibre reinforced polymer slotted waveguide array fed by a loop type end launcher', Proceedings of the Asia-Pacific Microwave Conference Proceedings, APMC, Asia-Pacific Microwave Conference, IEEE, Seoul, South Korea, pp. 476-478.View/Download from: Publisher's site
The investigations of an end-launcher transition in Carbon Fibre Reinforced Plastic (CFRP) WR90 waveguides is presented. The applicability of the feed for CFRP slotted waveguide antenna is addressed. Some of the aspects pertaining to the efficiency of CFRP slotted waveguide antenna and its use for radar applications are discussed. The results are presented in comparison with those obtained from the same concepts implemented in aluminium waveguides. A recently implemented anisotropic model for CFRP laminates, which describes the electrical anisotropy of the composite material, was used. The data obtained provide promising indicators for the potential use of slotted waveguide antennas made of CFRP for radar applications. © 2013 IEEE.
Shariati, N, Rowe, WST & Ghorbani, K 2014, 'Highly sensitive rectifier for efficient RF energy harvesting', European Microwave Week 2014: Connecting the Future, EuMW 2014 - Conference Proceedings; EuMC 2014: 44th European Microwave Conference, European Microwave Conference, IEEE, Rome, Italy, pp. 1190-1193.View/Download from: Publisher's site
© 2014 European Microwave Association. RF (Radio Frequency) energy harvesting is a promising technique to provide a sustainable energy source for the long-term conservation of the environment and the global economy. To address this, we proposed an efficient rectifier over a wide low input RF power range (-40 to -10 dBm) for broadcasting band (520- 590 MHz) to determine the usefulness of exploiting freely available RF energy sources in this band. The input reflection coefficient and rectified output power demonstrate the practical feasibility of this low-power rectification technique. Power conversion efficiency (PCE) of 53% and 1.5% are achieved for a single-tone input power of -10 dBm and -40 dBm respectively. Therefore, this innovative technique has the potential to generate a viable perpetual energy source for low power applications in urban environments.
Shariati, N, Rowe, WST & Ghorbani, K 2012, 'RF field investigation and maximum available power analysis for enhanced rf energy scavenging', European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012, Conference on European Microwave Week Connecting the World, pp. 329-332.
RF energy harvesting is attracting widespread interest to meet the goal of providing sustainable energy sources for future growth and protection of the environment. In order to demonstrate the feasibility of RF energy harvesting, RF field investigations and analysis of maximum available power in the suburbs of Melbourne, Australia are conducted. Measurement results and analysis indicate that broadcasting system at 540 MHz (with 20 MHz bandwidth) and 100 MHz (88-108 MHz) are great scavenging sources. These frequency ranges provide stable RF signal levels and low propagation loss, produce maximum available power to a range of locations. In addition, broadcasting bands offer a great deal of flexibility to deploy simple and cost-effective implementations, which is of paramount importance for optimal power harvesting systems. © 2012 EUROPEAN MICROWAVE ASSOC.
RMIT University, Australia
University of Seville, Spain
Hokkaido University, Japan
KU Leuven University, Belgium