NEWS UPDATE:
2019 April: Our paper on "A Single-Layer Frequency-Selective Surface for Ultrawideband Electromagnetic Shielding" has been selected for Motohisa Kanda Award for most citded paper of the IEEE Transactions on EMC in the past five years. Ironically, Dr Mohitasa Kanda, a leading scientist at National Institute of Science & Technology, Boulder, Colorado, USA at the time, was the main external examiner of Karu's Ph.D. thesis at the University of Ottawa.

2019 March: Dr Maria Kovaleva has been selected by the Faculty of Science & Engineering as the Graduate Speaker for 2019 April 18th Graduation in which all Engineering undergraduate, postgraduate and Higher-Degree-Research candidates graduate together with graduates from the Computing Department.

2019 January: Our Antennas Shine in Space, on board The World's First Entirely Ka-band CubeSat Satellite

The twin-array antenna system aboard the world's first entirely Ka-band CubeSat satellite – Audacy Zero – was designed by a team of researchers led by Professor Karu Esselle. Audacy Zero was launched to space and deployed in December 2018 by SpaceX Falcon 9 rocket. Shown below is a snapshot of the launch of the Audacy satellite with our antenna system (and several other satellites) in the SpaceX Falcon 9 rocket.



Source:  (From 19:41 time stamp)

A senior engineer of Audacy Space – a company spun off Stanford University and located in California, USA - attended Professor Esselle’s 2017 IEEE Antennas and Propagation Society Distinguished Lecture at the Texas Instruments headquarters in Santa Clara, Silicon Valley, California, and initiated this industry collaboration.


In a recent email to Professor Esselle, Audacy Chief Engineer James Spicer confirmed: “Hi Karu, We are indeed flying your antennas on Audacy Zero, .. Many thanks for you and your team’s hard work on the project ..”. This is believed to be the first Australian-designed antenna system deployed in space in almost two decades, since antenna systems designed at CSIRO in the 80’s and 90’s such as those for Australian FedSat satellite, which was launched in 2002.


Dr Affan Baba of Professor Esselle’s research team also played a significant role in this challenging industry-sponsored research project. Audacy is building a space relay network to provide continuous connectivity to commercial and other CubeSats. Without such a space relay network, a CubeSat can be seen from a fixed ground station only for a few minutes per day and that is often not enough to download all the data collected by the CubeSat.


Further, we have been invited to join Audacy Alliance as space antenna experts. Audacy Alliance is a consortium of industry leading spacecraft product and technology providers that aim towards an open global standard for spacecraft communication.


Audacy Zero satellite. Our twin-array antenna system can be seen on centre right.

Source: https://www.youtube.com/watch?v=8KvucmR37-c


 

Video clip of the Audacy ZERO satellite, showing the twin-array antenna system designed by us:

https://www.youtube.com/watch?v=8KvucmR37-c

Video of the launch of Audacy Zero by SpaceX in Spaceflight’s first fully dedicated rideshare mission SSO-A SmallSat Express:





IN MEDIA:

·   2019 March:  Newsletter from the Executive Dean, Faculty of Science and Engineering,
"Macquarie Designed Antennas Shines in Space Space"

·     2019 March  Twitter, tweet from teh Faculty of Science and Engineering @MQSciEng
Antennas in Space

·      2018 July: RF Globalnet (USA) Editorial
“What's Needed To Take Wearables To The Next Level?"


·      2018 April  Twitter, tweet from the Faculty of Science and Engineering @MQSciEng
“Congratulations to Karu Esselle on 25 years of service to @Macquarie_Uni” 
    and from @MQPhysAstro

·    2016 December: Engineering and Technology History WiKi,"IEEE New South Wales History (since 1890) 
·    2015 October: Shields Up


PREVIOUS NEWS:

·    2018 November: We would be able replace protruding TV receiving dishes with concealable integrated smart antennas!! In a quest to create low-cost beam-scanning antenna system that could replace dish-shaped reflector antennas used in low-end applications, second generation of beam-scanning antenna system was developed using our landmark antenna beam steering technology. This antenna system uses a pair of graded-dielectric plates with a base antenna and can scan the antenna beam in a conical region having an apex angle of 82o. The details are published in Journal of Applied Physics in article “Electromagnetic-Wave Beam-Scanning Antenna using Near-Field Rotatable Graded-Dielectric Plates

·    2018 August: A high gain along with an extremely large gain bandwidth ( 50%) can be achieved from a small size resonant cavity antenna employing a partially reflecting surface made out of only a single dielectric material . The details are published in IEEE Transactions on Antenna and Propagation in article “Compact High-Gain Antenna with Simple All-Dielectric Partially Reflecting Surface .

·    
2017 August: This Week
"Presidential Nomination".


·   
2017 July: After two rounds of nominee eliminations, Karu has been selected as one of the two candidates in the ballot for 2019 President of the IEEE Antennas & Propagation Society (APS), the premier international learned society in antenna field, which has over 8,000 members worldwide and headquarters in the USA. In the 69-year history of this learned society, Karu is the first ever Australian academic selected for APS presidential ballot. During this 69 years, only three others from Asia and Pacific received this honour – one Australian and two Japanese. Two of them got elected including Dr Trevor Bird, former Chief Scientist of CSIRO and Adjunct Professor of Macquarie University.

·  2017 July: Our invited chapter on “Making UWB Antennas Unidirectional: Phase Coherence with an Ultra-Wide Band Frequency Selective Surface Reflector,” is available in the book entitled The World of Applied Electromagnetics in Appreciation of Magdy Fahmy Iskander, edited by Akhlesh Lakhtakia and Cynthia Furse, Springer (USA), 2017.

·  2017 July: We use optimization on daily basis in our lives starting from choosing a convenient commute to making a decision on what to cook for dinner. As an antenna engineer, we also optimize daily: a satisfactory solution is bounded by compromises and trade-offs. If the optimization problem has mixed variables (some variables are continuous and others are discrete) and/or constraints, many popular optimization methods fail to offer a solution. Our approach, the optimization by the Cross-Entropy method, can handle such optimization problems with ease and elegance due to the use of probability distribution functions and information theory. See our paper in IEEE Transactions on Antennas and Propagation for details: “Cross-Entropy Method for Electromagnetic Optimization with Constraints and Mixed Variables”.

·   2017 July: This paper we published in IEEE Transactions on Antennas and Propagation shows how to achieve a record gain bandwidth product from a small antenna using resonant cavity antenna concept and particle swarm optimisation: 
Achieving a Large Gain-Bandwidth Product from a Compact Antenna.

·   2017 April: Your high-gain antenna is totally stationary. Yet you can steer its beam to any direction within a very large conical volume (apex angle > 100 degrees) without any electronics! Our innovative near-field phase transformation method with two rotating metasurfaces placed at a fraction of wavelength from a high-gain antenna has many advantages over current electronic or mechanical antenna beam steering methods. See our paper in IEEE Transactions on Antennas and Propagation for details: “Steering the Beam of Medium-to-High Gain Antennas Using Near-Field Phase Transformation”.

·  2016 December: Karu has been re-elected as the 2017 Chair of IEEE New South Wales (NSW) Section, which has approximately 2,000 IEEE members including approximately 50 IEEE Fellows. He will also represent NSW in IEEE Australia Council - the national body of IEEE, and will chair the IEEE NSW AP/MTT Chapter in 2017.

·    2016 July: Karu has also been selected as one of the three new Distinguished Lecturers of IEEE AP Society for 2017-2019. He is the only Australian AP Distinguished Lecturer (DL) in almost two decades, and second Australian AP DL ever.

·  2016 June: How do you steer the beam of a leaky-wave antenna without changing frequency and without changing bias voltages, i.e. using only two fixed DC bias voltages? Answer: by cascading reconfigurable binary unit cells to form multi-state macro cells. Details are in our paper in IEEE Transactions on Antennas and Propagation: “Fixed-Frequency Beam Steering of Microstrip Leaky-Wave Antennas using Binary Switches”.

·  2016 April: Leaky-wave antennas with dual side beams can have a wide bandwidth too. See our paper in IEEE Transactions on Antennas and Propagation for details: “Wideband Microstrip Leaky-Wave Antennas with Two Symmetrical Side Beams for Simultaneous Dual-Beam Scanning”.

·  2016 February: This paper we published in IEEE Transactions on Antennas and Propagation has set a new world record for the Gain-Bandwidth Product per Unit Area of any low-profile (< one-wavelength tall) high-gain antenna: “A class of extremely wideband resonant cavity antennas with large directivity-bandwidth products”.

·    2016 January: Metasurfaces are used with antennas for range of application but are mostly placed in either far-field or at least several wavelengths from the antenna. For the first time, a near-field phase-correcting metasurface was developed to improve directive radiation characteristics of aperture antennas. This metasurfaces was placed at a quarter of a free-space wavelength spacing from the antenna. Details are published in IEEE Transactions on Antennas and Propagation in “A Low-Profile Printed Planar Phase Correcting Surface to Improve Directive Radiation Characteristics of Electromagnetic Band Gap Resonator Antennas”.

 ·    2015  November: In a state-wide election held in November 2015, Professor Karu Esselle has been elected as 2016 Chair of IEEE New South Wales (NSW) Section. This Section, with about 2,000 members, oversees all IEEE activities in the state. This is the first time a Macquarie University academic has been elected to lead IEEE at state level. He will also represent NSW in IEEE Australia Council - the national body of IEEE, and will chair the IEEE NSW AP/MTT Chapter in 2016.

·    2015 August: Optical lenses have been used for long in old light houses to focus energy in a direction. The concept inspired antenna engineers to develop lens antennas that have directive radiation characteristics and are designed following the ray-tracing method typically used for lens design. We transformed this tradition and developed a new method of focusing energy of an antenna using phase of the electric near-field of the antenna. The achieved results are revolutionary, not only in improving directivity of the antenna but also remarkable in reducing the maximum height of the lens. The first paper on the topic was published in IEEE Transactions on Antennas and Propagation for details: “Dielectric Phase Correcting Structures for Electromagnetic Band Gap Resonator Antennas”.

·    2015  June: The near-field phase correction strategy is a game-changing theory and was demonstrated with an all-dielectric staircase or stepped structure. The necessary theory to realise a continuous shaped all-dielectric phase-correcting structure was then developed in a follow-up research article that was published in Journal of Applied Physics. For details read “Quasi-Analytical Synthesis of Continuous Phase Correcting Structures to Increase the Directivity of Circularly Polarized Fabry-Perot Resonator Antennas”.

·  2014 November: Karu was elected to the IEEE AP Society Administrative Committee (AdCom) for a three-year term in 2014. He is said to be the only person residing in Asia and Pacific (IEEE Region 10) to be elected to this highly competitive position over a period of at least six years (2010-2015).

MY COLUMNS:


·      
2019 February : IEEE Antennas and Propagation Magazine: Meet the New Dishtinguished Lecturers.


CONTACT DETAILS:

·         Office:
Room 135, Building E6B
(please inquire for visiting hours by email)


·         Mailing Address:
Room 135, 7 Wally's Walk (E6B)
School of Engineering
Faculty of Science and Engineering
Macquarie University, NSW 2109
Australia


·         Phone: +61 (2) 9850 9141
·         Email: karu.esselle@mq.edu.au
·         Email: karu@ieee.org

·         Skype/VideoCon: karu.esselle

·         Directions: Walk from Macquarie University Train Station
·         Directions: Drive from Sydney CBD