EuCAP 2017 - Keynote and Invited Speakers

Cyril Mangenot EurAAP chair and Alain Sibille EuCAP 2019 Chair
Welcome Ceremony

 

 


Keynote speakers


Koichi ITO, Chiba University, Japan
Human Centric Antennas
Recently, wearable wireless devices have been widely used in our daily life. Also, implantable wireless devices have been developed and become available for various monitoring as well as identification systems. Unlike conventional wireless devices, wearable or implantable devices are used on or in the human body. In this sense, body-centric wireless communications (BCWCs) have become a very active area of research. On the other hand, radio-frequency or microwave medical devices used for cancer treatment and surgical operation have completely different functions. However, they are used on or in the human body. In terms of antennas installed inside the devices, such medical devices have lots of similarities to BCWCs. To design properly and to make the best use of specific antennas for different wireless devices, it is important to treat them as human-centric antennas. In general, the problem of an antenna placed on or in the human body can be treated as a so-called "boundary value problem" where the human body is considered as a lossy medium. However, in reality and simplicity, an individual case is treated appropriately in a specific manner by numerical simulation such as the FDTD technique. The paper introduces a few examples of wearable antennas as well as implantable antennas developed and tested in our laboratory. In addition, the paper describes some challenges of human-centric antennas.

 

 

Jean-Claude SOUYRIS, CNES, Toulouse, France
A Whirlwind of Innovation in Space Technology
This presentation will primarily turn the spotlight on the hot topics of the moment in Space activities: the arrival of new players, mainly from the digital world where young millionaires discover a passion for space and are receptive to the idea that space can be conquered by private entrepreneurs; the emergence of large scale satellite constellations; the enthusiasm for nanosatellites enabling the academic world to nurture its training and research ambition; the growing volumes of satellite data, and the development of space applications fuelled by the spectacular transition to the digital economy. We will then address some of the key technologies for the Space of tomorrow (including those in the field of RF technics, antennas, and propagation), that need to be mastered in order to adapt to the foreseen changes. The talk will finally be illustrated by an example of innovation management in a timeline of 25 years in the field Earth Observation based on RF and antenna techniques (radar altimetry) for ocean observation and water management.

 



Invited speakers


Chi-Chih CHEN, Ohio State University, USA
A Special Antenna Gain Measurement Technique
Conventional antenna gain measurement techniques involve transmission measurements of additional antennas in addition to antenna under test. This not only increases the amount of measurements but also introduce error associated with setup changes and reference gain accuracy. The scattering and unbalanced current radiation from the cable can sometimes introduce measurement error. Furthermore, the cable loss associated with the long cable below VHF and above Ku band becomes a major limitation factor in measurement sensitivity. This talk discusses an alternative antenna gain measurement technique based on backscattering measurement of the antenna. This approach completely eliminates the cable connected to the antenna and reference gain antenna. The methodology and simulation examples will be demonstrated. The accuracy and limitations of this method will also be discussed. This gain measurement could be very useful for determining gain patterns of antenna in situ such as antenna on chip, wearable antennas, and antenna on wafer.



Jaehoon CHOI, Hanyang University, Korea
On-body Antennas for Critical Bio-Signal Monitoring Systems
In this invited talk, three types of on-body antennas for bio-signal monitoring systems will be presented. Firstly, antenna design techniques for on-body to on-body communications are discussed; (1) TM21 higher order mode patch antenna with monopole-like radiation; (2) additional corrugation/EBG structure for body surface wave enhancement. Secondly, designs of dual-modes antennas for repeater systems are introduced. In order to design dual-modes antennas for in-on-on and on-on-off communication links, we propose a few miniaturization techiques as well as how to integrate two radiating elements with different operating frequencies into a single antenna structure. Lastly, the textile antenna using all-textile materials such as conductive textile, conductive thread, and non-conductive fabric for practical wearable applications is presented.



Thomas F. EIBERT, Technical University of Munich, Munich, Germany
Transmission equations for single and multiple antenna systems – from basic formulations to antenna measurements in complex environments
Under far-field conditions, the transmission of electromagnetic waves is commonly described by the Friis transmission equation. Wave propagation effects can be included by ray concepts together with appropriate phase terms. Motivated by the needs of near-field antenna measurements, we will look into a couple of near-field antenna transmission equations, where we will find that spectral formulations of such transmission equations are commonly advantageous in terms of physical insight and numerical treatment. A very flexible and numerically advantageous near-field transmission equation works with spectral propagating plane wave representations and it is found that this equation is nothing else than a near-field generalization of the Friis transmission equation. Based on this transmission equation, we will formulate antenna field transformation algorithms and we will show the performance of such algorithms for field transformations in complex environments, where reflection and scattering effects are involved or where only near-field measurements without phase information are available.



Mats GUSTAFSSON, Lund University, Sweden
Antenna Current Optimization and Optimal Design for Small Antennas
Antenna design can be considered as an art of shaping and choosing materials to produce a desired current distribution on the antenna structure. Antenna current optimization is a tool to determine an optimal current distribution which can be used for physical understanding, as a priori estimates of the possibilities to design antennas, physical bounds, and as figures of merits for antenna designs. Antenna current optimization is particularly useful for small antennas for which the Q-factor and stored energy are of primary importance. In this presentation, antenna current optimization and stored electromagnetic energy expressions are reviewed. A tutorial description of the steps used to determine the lower bounds on the Q-factor for arbitrarily shaped structures and structures embedded in metallic structures are presented. Moreover, it is demonstrated how the approach can be modified to handle lossy and dispersive materials as well as antenna quantities such as efficiency, gain, directivity, and capacity.



Christoph F. MECKLENBRÄUKER, TU Wien, Vienna, Austria
Channel Modeling for Dependable Vehicular Connectivity
Vehicles and other road users will be linked to each other and the road infrastructure to make traffic more efficient, cleaner, and safer. For example, Vehicle-To-Vehicle (V2V) and Vehicle-To-Infrastructure (V2I) communication enables cooperation and intelligent route management in transport networks. To achieve these ambitious goals, wireless links must become dependable: The information relevant for intelligent transport systems (ITS) shall be shared reliably within a tolerated latency. Challenges for cooperative ITS are posed by nonstationary time-frequency-selective fading processes in vehicular channels. Fortunately, the nonstationary vehicular fading may be characterized by assuming local stationarity for a finite region in the time-frequency plane. Thus, we characterize the channel by a local scattering function (LSF). High delay spreads are observed for rich scattering and high Doppler spreads characterize drive-by scenarios. These channel characteristics translate into packet error sequences exhibiting dependencies. Finally, we discuss packet error models of low complexity for large-scale cooperative ITS emulation.



Eva RAJO-IGLESIAS, University Carlos III of Madrid, Spain
Antenna Designs based on Gap Waveguide Technology
Gap waveguide technology is based on the control of wave propagation by using periodic structures. This technology, derived from the metamaterials and artificial surfaces background, has been employed during the last seven years to develop new antenna system components. The main advantage is the compromised low loss characteristic/low cost feature, provided by the possibility of using only metal and the non required electrical contact. Consequently, the technology has a lot of potential to be use in the millimeter wave frequency range. Along these years, classical antenna designs have been revisited using this technology as for instance slot arrays or leaky wave antennas but also other system components such as filters, diplexers or feed networks. A global overview of the technology, the different metasurfaces to be used and mainly the state of the art in terms of antenna designs making use of it will be presented in the talk.



Takuya SAKAMOTO, University of Hyogo, Himeji, Japan
Human Body Imaging and Remote Vital Monitoring using UWB Doppler Radar
This talk introduces recent developments in the signal processing aspects of ultra-wideband (UWB) radar technology for measuring human bodies. Ultra-wideband radar has various applications, including measuring body shape and action types, and even remotely measuring vital signs such as respiration and heartbeat. This talk covers several advanced signal processing techniques, which are applicable to UWB radar data for retrieving information about the subject. Near-field radar imaging technology is currently used for body scanners at airports intended to detect concealed weapons. Our techniques enable us to generate high-quality radar images quickly, which is crucial for real-time applications. Another technique we have been developing is related to noncontact measurement of vital signs, which could be a breakthrough in the recent trend of health-conscious gadgets. Our signal processing helped us to achieve an unprecedented level of accuracy in the noncontact measurement of instantaneous heartbeat intervals using a multiple-input multiple-output UWB radar system.

 

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