Keynote Speech 1

Electromagnetic Technology for Automotive Applications
Speaker: Dr. Kazuo Sato (Toyota Central R&D Labs., Inc. Nagakute, Aichi, Japan)
Abstract:
In recent years, active safety systems, such as adaptive cruise control (ACC), automatic emergency breaking (AEB), and blind spot monitor (BSM) have gained increasing interest. Furthermore, automated driving systems will be expected to realize a society where everybody can have safety, efficiency and freedom of mobility in future. On the other hand, development of eco-cars is also very interested. In addition to hybrid vehicles (HV), various types of vehicles, such as electric vehicles (EV), plug-in hybrid vehicles (PHV), and fuel cell vehicles (FCV) have been developing. We will be able to build a sustainable mobility society with high energy efficiency by choosing the optimum vehicle according to the applications. In order to realize automated driving systems and electric vehicles, I think electromagnetic applications, such as sensors, antennas, mobile communication systems, and wireless power transfer systems become increasingly important.
In this talk, technical trends of automated driving systems, electric vehicles and electromagnetic devices for automotive applications will be introduced. First, basic concepts of millimeter wave radar and optical LiDAR systems will be discussed, and the research history will be outlined. Then, as some examples of practical systems, electronically scanned millimeter wave radar systems and optical depth sensors using the CMOS technology will be introduced. In order to improve the performance of the systems, antenna technology for the beam scanning and signal processing methods are important. Next, wireless power transfer systems for electric vehicles will be discussed. When the systems are installed in the automobiles, the effect of the car body on the antenna system and the effect of the system on the electronic equipment and the human body needs to be taken into account in designing the systems. This presentation will clarify the effect. Finally, future research on electromagnetic technology in automotive applications will be stated.

Biography:

Kazuo Sato received the B.E. and M.E. degrees from the University of Tsukuba, Ibaraki, Japan, in 1985 and 1987, and a doctoral degree in engineering from Nagoya University, Aichi, Japan, in 1996. He joined Toyota Central Research and Development Laboratories (TCRDL), Incorporated, Aichi, Japan, in 1987. He has been engaged in research on numerical analysis of mobile antennas and development of antennas for mobile communication systems and automotive radar systems. His research interests also include millimeter wave and optical metamaterials and development of LiDAR system applications. He is a director, member of the board and division manager of strategic research division at TCRDL. He is a vice-chairperson of IEICE Tokai section.

Keynote Speech 2

Reflectarray Design Techniques for Millimeter Wave Applications
Speaker: Prof. Young Joong Yoon (Yonsei University, Seoul, Korea)
Abstract:
Recently, millimeter wave antennas are used in various systems such as radars, satellite communication and military. Antennas of these systems usually require the high directivity because of the high path loss of millimeter wave propagation channel. One of the most commonly used high directive antennas is a reflector antenna. However, due to the curved shape of the reflector, the parabolic antenna is difficult to manufacture and requires a large volume to be installed. To overcome these, microstrip reflectarray antenna with flat surface is proposed and studied in many previous researches. However, because the reflectarray still has the long focal length and feeder blockage, folded reflectarray is recently proposed. It has the half focal length and there is no blockage due to the use of a polarizing grid layer and a polarization twist reflectarray element.
In the millimeter wave case, it has the several more design considerations because of the shorten wave length. Especially, the reflection phase sensitivity causes the degradation of the antenna performances because the limitation of fabrication resolution makes the phase error in millimeter wave. To overcome this phenomenon, the element design techniques to reduce the reflection phase sensitivity are introduced in this talk. For example, square ring element which has the optimal phase changing procedure is proposed for the reflectarray. This element has the low phase reflection sensitivity in the millimeter wave. Thus the phase error is reduced and the aperture efficiency is improved. And also the rectangular and split-ring combined element is designed by using the coupling effect for the folded reflectarray. It has the many detailed reflection phase value with high reflection amplitude, and consequently phase error is reduced and the aperture efficiency is improved. Additionally, the several techniques to improve the performance of reflectarray antenna such as feeder design, geometric optimization and polarizing grid will be presented with the basic theory of reflectarray. The aperture efficiency of designed reflectarray has the high aperture efficiency of 66.7 %. Also, the reflectarray can be designed to achieve the 33.52 % 1-dB gain bandwidth by using the wideband element. The folded reflectarray which is designed using the rectangular and split-ring combined element has the high aperture efficiency of 55.04 % compare with the conventional folded reflectarrays.

Biography:

Young Joong Yoon received B.S. and M.S. degrees in electronics engineering from Yonsei University, Seoul, South Korea, in 1981 and 1986, respectively, and Ph.D. degree in electrical engineering from the Georgia Institute of Technology, Atlanta, GA, USA, in 1991. He was Senior Researcher with the Electronics and Telecommunications Research Institute, Daejeon, South Korea, from 1992-1993. He joined Yonsei University in 1993 as a Faculty Member, where he is currently a Professor with the Department of Electrical and Electronics Engineering.
He has expertise in around the antenna engineering such as the mobile antenna (small antenna), antenna array, UWB (Ultra-wide Band) antenna, high power antenna, hyperthermia, RCS (Radar Cross Section) engineering, propagation channel engineering, etc. In field of reflectarray antenna area, he proposes the many significant design techniques such as the high aperture efficiency and wideband reflectarray, and also the folded reflectarray design techniques to improve the performance is proposed in millimeter wave frequencies.
He received Commendation Award of President of Korea in 2006, Best Paper Award from the Electronics and Telecommunications Research Institute in 2014. He was the President of the Korean Institute of Electromagnetic Engineering and Science in 2012.

SPONSORED BY

This conference is financially supported by the Telecommunications Advancement Foundation.