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August 2018

Xiaolong You – Terahertz Focusing Reflectarray with Enhanced Bandwidth

August 31, 2018 @ 3:35 pm - 4:00 pm
S112, Engineering South

ABSTRACT            Focused beam is desirable for providing enhanced gain for terahertz communications and improved resolution for imaging systems. In traditional lenses, beam focusing is realized using bulk materials with limitations in material availability, size and efficiency. As an alternative, we employ a thin reflectarray based on stub-loaded square patches to attain the same functionality. We numerically and experimentally demonstrate that the proposed reflectarray is capable of focusing an incident collimated beam into a point at a finite distance. This focusing…

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October 2018

Siti Nailah Mastura Zainarry – A Pattern-Reconfigurable Single-Element Microstrip Antenna

October 5, 2018 @ 3:10 pm - 3:35 pm
S112, Engineering South

 ABSTRACT            A pattern-reconfigurable antenna based on a simple single-element microstrip antenna is presented. The antenna has a shorting wall near the patch center to introduce two slightly shifted resonances at its two radiating edges. A stub-loaded varactor is mounted at one of the patch radiating edges to obtain pattern reconfigurability, by electronically detuning the frequency of one of the resonances. Preliminary measurements of a prototype demonstrate that the antenna exhibits beam squint up to 39o on one side of the…

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Negar Mansouri – Feasibility of 3D graphene-based scaffold for tissue engineering applications

October 5, 2018 @ 3:35 pm - 4:00 pm
S112, Engineering South

ABSTRACT            Numerous efforts have been made in tissue engineering and regenerative medicine fields in order to produce functional replacements which restore malfunction tissues or organs. Graphene derivatives are considered as a promising candidate which provide a biocompatible, conductive and porous structure for satisfactory tissue regeneration. This study reports the fabrication of 3D composite graphene-based scaffold by a simple and eco-friendly method.  The physical, chemical and electrical characteristics of obtained scaffolds have been examined. Subsequently, the characterization techniques approves the capacity…

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Ali Malakooti – Bandwidth Enhancement of a Double-Element Vivaldi Antenna with Sum and Difference Radiation Patterns

October 12, 2018 @ 3:10 pm - 3:35 pm
S112, Engineering South

ABSTRACT  A two-port double-element Vivaldi antenna with enhanced bandwidth and two different radiation patterns in the E-plane is presented herein. The achieved bandwidth ranges from 2.6 GHz to 18 GHz, with a gain increasing from 7.3 dBi at 2.6 GHz up to 15.1 dBi at 18 GHz. The bandwidth extension is obtained in the base double-element Vivaldi antenna by reducing the distance between the two elements and elongating the inner flares, thus delaying the emergence of grating lobes. The mutual…

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November 2018

Prof Jason Ralph – The Physics of Quantum Navigation

November 1, 2018 @ 3:00 pm - 4:00 pm

Abstract: We consider how ultra-precise quantum sensors could be integrated with conventional classical navigation systems to improve performance. We present two examples, one where an accurate low-bandwidth sensor is used to calibrate inherent biases in high-bandwidth inertial sensors, and one where quantum entanglement can be shown to provide a quantum advantage over classical calibration methods. Biography: Jason Ralph received a BSc in Physics with Mathematics from the University of Southampton (UK) in 1989 and a DPhil degree from the University…

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Prof. Lang White – Correlated Equilibria in Satisfaction Games

November 2, 2018 @ 3:10 pm - 4:00 pm
S112, Engineering South

Presenter : Prof Lang White, The University of Adelaide, Australia. Joint work with Dr Duong Nguyen (Uni of Adelaide) and Oskar Rynkiewcz (IMT-Atlantique, Brest, France). Abstract : In this presentation I will introduce the idea of correlated equilibria in satisfaction games. A satisfaction game is a multi agent system where agents (players) do not compete to maximise some utility (payoff) function, but rather, they try to satisfy set theoretic constraints imposed on their own actions by those of the other agents. When…

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IEEE AP/MTT – Dr. Philipp Gutruf – Soft, wireless sensors and photonics for assessment and stimulation of biological systems

November 6, 2018 @ 3:00 pm - 4:00 pm
S112, Engineering South

Abstract          Recent advances in materials and fabrication concepts coupled with miniaturization of wireless energy transfer schemes enable the construction of soft high-performance electronic and optoelectronic systems with sizes, shapes and physical properties matched to biological systems. Applications range from continuous monitors for health diagnosis to minimally invasive exploratory tools for neuroscience. This seminar explores basic science and engineering aspects for the creation of such systems. Their applications are discussed in the context of imperceptible body-worn devices for the assessment of…

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IEEE Section – Dr Franz Schlagenhaufer – Some EMC issues in Radio Astronomy

November 28, 2018 @ 5:30 pm - 6:30 pm
B17 Ingkarni Wardli

Abstract: Radio astronomy is concerned with measurement of faint electromagnetic signals. Radio telescopes are increasingly sensitive, due to improvement in receiver technology and signal processing. This also means that man-made noise has to be all but eliminated. The interference from third-party equipment can be reduced by placing radio telescopes in the middle of nowhere; an example is the Murchison region in Western Australia, the site for two existing state of the art radio telescopes, namely the Murchison Widefield Array (MWA) and the Australian SKA Pathfinder (ASKAP),…

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IEEE AP/MTT – Prof. Tadao Nagatsuma – Millimeter-wave and Terahertz Applications Enabled by Photonics

November 29, 2018 @ 3:00 pm - 4:00 pm
S112, Engineering South

Abstract This lecture presents how effectively photonics technologies are implemented not only in generation, detection and transmission of millimetre waves (MMW) and terahertz (THz) waves, but also in system applications such as communications, measurements, spectroscopy and imaging to efficiently enhance their performance. After briefly reviewing key devices and components, first, wireless communications applications are discussed aiming at a data rate of terabit/s. Next, frequency-domain spectroscopy systems are presented, in particular focusing on the approach to increasing a measurement sensitivity, and…

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IEEE AP/MTT – Dr. Chengjun Zou – Electrically tunable dielectric metasurfaces facilitated by the photoalignment of liquid crystals

November 30, 2018 @ 10:00 am - 11:00 am
N132, Engineering North

Abstract: Optical metasurfaces based on dielectric resonators have established as an efficient platform for realizing a multitude of optical functionalities. Recently, tunable optical dielectric metasurfaces have attracted increased research interest, and various tunable dielectric metadevices have been demonstrated. Infiltrating dielectric metasurfaces with nematic liquid crystals (LCs) represents an efficient and convenient tuning approach, which is compatible with established LC industrial technologies. Here we demonstrate two electrically tunable LC-infiltrated dielectric metasurfaces working at near-infrared and visible wavelengths, respectively. For the first…

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