ELEC-E9950 - Research seminar on electronics and nanoengineering V D, Lecture, 14.9.2022-17.5.2023

Prof. Tinus Stander, University of Pretoria, South Africa: "3D printed dielectrics in
microwave and mm-wave design: past, present and future"

This is an in-class event.

Jussi Rahola, Jaakko Juntunen and Olli Pekonen from Optenni Ltd presents new features in OptenniLab software. OptenniLab is a software tool for antenna design and analysis. This is an in-class session.

In-class session: Vessen Vassilev, Chalmers University of Technology, Sweden: Polarimetric
methods for road surface characterization

Abstract: Polarimetric
parameters such as entropy and polarimetric pedestal (depolarization) have been
developed in the past for surface classification of SAR images. We apply the
polarimetric parameters for measuring the friction properties of a road
surface. Entropy and depolarization happen to be a reliable measure of weather
the surface is dry, wet, or covered with a thin layer of ice. We conducted
laboratory measurements using a VNA at W band to demonstrate the potential of
the method. We also developed a polarimetric radar based on TI automotive radar
platform covering 77-81 GHz. We conducted field measurements of various
surfaces and will present the results.

 In parallel
we work on a passive method, where we generate an emissivity plot at two
orthogonal polarizations. Dry, wet and icy surfaces occupy different regions in
the emissivity plot and thus we can distinguish the properties of the surfaces.
For this we developed a polarimetric radiometer, which measures the temperature
of the surface at a certain oblique angle in an outdoor environment. To relate
measured temperatures to emissivity additional information about the surface is
needed, as for example its roughness. For this reason, we implemented frequency
resolution and thus can potentially extract the surface roughness.  We will
present results from observations.

Dr. Kim Östman from Nordic Semiconductor wil give a talk about Cellular
IoT solutions.  Physical location Maarintie 8, 2171a AVP Space Moose Lounge Zoom https://aalto.zoom.us/j/69444554603

Sergei Tretyakov: Electromagnetic phenomena in time-modulated metasurfaces

Thesis Presentation by Bruce Clayhills

Topic: Design of a Transceiver Frontend for the Foresail-2 Small Satellite

Lecture slides

On-line Guest presentation by prof. Azremi Bin Abdullah Al-Hadi: Antenna Research in Universiti Malaysia Perlis,
Malaysia

This talk briefly overviews the research and development
(R&D) of antennas in Universiti Malaysia Perlis. The R&D activities in
the area of wearable antenna, reconfigurable antenna, antenna for mobile
terminal, bioelectromagnetics for different kind of applications are briefly
explained based on the projects granted to researchers in the Advanced
Communication Engineering Center of Excellence (ACE CoE).

This is an on-line talk.

Professor Mats Gustafsson, Lund University, Sweden: Degrees
of Freedom and Characteristic Modes

Scattering-based
formulations for characteristic modes are presented, resembling the original
proposal by Garbacz. Formulations of characteristic modes as scattering
problems are independent of the associated computational tools. This enables
frequency-domain solvers such as the FEM and time-domain solvers such as FDTD
to complement classical MoM-based formulations in characteristic mode analysis.
An iterative algorithm is introduced to construct transition matrices and
scattering dyadic, effectively reducing the computational complexity to
approximately one CM per full-wave solution. Moreover, it is shown that the
scattering approach can be linked to the degrees of freedom for an object to
the geometry of the object.

MSc thesis presentation by Jarno Mustonen: Design of wide-band GNSS antenna

Professor Ari Sihvola: 19th
century electric and magnetic experiments leading to radio science and
engineering

This is an in-class event only.

Abstract: The
research, education, and other activities of our ELE Department rest on the
foundations of electromagnetics, radio science, electronics and modern micro-
and nanotechnology. From where has all the know-what and know-how of electric
and magnetic phenomena emerged? How has mankind become aware of
electromagnetism, how have we learned to exploit this understanding, to good
and bad purposes? In this presentation, I focus on the main discoveries of the
19^th century in this field, discussing the historical developments
and demonstrating fundamental electric and magnetic effects.

MSc thesis presentation by Lauri Alonen: Koaksiaalisen kollineaariantennin suunnittelu ja
toteutus (in Finnish)

The presentation is on-line

MSc theses presentations by

Mohamed Räsänen: Design and Analysis of a High Gain and Wide Band Phased Array Antenna for V-Band

Stefan Andersson: Feasibility Study on Additive Manufacturing of Dielectrics in Antenna Structures

Aleksandr Kuznetsov: Modelling of Coupled Multi-antenna Backscattering System

This is an in-class session

Kimi Jokiniemi will give his Master's Thesis presentation on Friday 31.3. at 13:00 in lecture room Maarintie 8, 1023-1024 AS4.

Zoom session is available as well: https://aalto.zoom.us/j/64725510874

M.Sc. thesis presentation by Sakari Sarkkinen: "Imaging at 94 GHz for aircraft
landing scenarios".

This is an in-class event