Northern Canada AP/MTT Joint Chapter

IEEE
May 28th, 2021

Time: June 14th, 2021 at 1:30 pm EDT

Join via this link: here

Speaker: Dr. Quevedo-Teruel at KTH Royal Institute of Technology

Oscar Quevedo-Teruel is a Senior Member of the IEEE. He received his Telecommunication Engineering Degree from Carlos III University of Madrid, Spain in 2005, part of which was done at Chalmers University of Technology in Gothenburg, Sweden. He obtained his Ph.D. from Carlos III University of Madrid in 2010 and was then invited as a postdoctoral researcher to the University of Delft (The Netherlands). From 2010-2011, Dr. Quevedo-Teruel joined the Department of Theoretical Physics of Condensed Matter at Universidad Autonoma de Madrid as a research fellow and went on to continue his postdoctoral research at Queen Mary University of London from 2011-2013.

In 2014, he joined the Division for Electromagnetic Engineering in the School of Electrical Engineering and Computer Science at KTH Royal Institute of Technology in Stockholm, Sweden where he is an Associate Professor and Director of the Master Programme in Electromagnetics Fusion and Space Engineering. He has been an Associate Editor of the IEEE Transactions on Antennas and Propagation since 2018 and is the founder and editor-in-chief of the EurAAP journal Reviews of Electromagnetics since 2020. He was the EurAAP delegate for Sweden, Norway, and Iceland from 2018-2020, and he has been a member of the EurAAP Board of Directors since January 2021. He is a distinguished lecturer of the IEEE Antennas and Propagation Society for the period of 2019-2022, and Chair of the IEEE APS Educational Initiatives Programme since 2020.

He has made scientific contributions to higher symmetries, transformation optics, lens antennas, metasurfaces, leaky wave antennas and high impedance surfaces. He is the co-author of 95 papers in international journals and 140 at international conferences.

Abstract

Fig. 1: Transformation of a cylindrical wave into a plane wave by using a convex lens represented with rays and waves.

Lens antennas are commonly englobed in a more general type of antennas, named aperture antennas. As their name indicates, they make use of a lens to modify the field distribution at the aperture of the antenna, which is typically fed by a single source. The lens is employed to transform the waves arriving from the source into a desired radiation pattern. Commonly, the desired radiation pattern is a directive beam in a given direction. However, similar to arrays, reflectors or leaky wave antennas, the goal changes depending on the application. For example, other desired features may be to produce multiple beams, or a broad beam-width.

Lenses were more commonly employed in optical applications. For this reason, most of the nomenclature comes from optics, and they are evaluated with rays theory. In this sense, the performance of the lens is conventionally described in terms of aberrations. An aberration is a failure of the rays to converge at the desired focus. This failure must be due to a defect or an improper design. Aberrations are classified as chromatic or monochromatic, depending on whether or not they have a frequency dependence. There are five monochromatic aberrations: spherical aberration, coma, astigmatism, Petzval field curvature, and distortion. However, this is not a common nomenclature for antenna designers in the radio-frequency and microwave regimes. In these regimes, the rays are substituted by electromagnetic fields, and the designers evaluate their antennas in terms of directivity, gain, efficiency, side lobe levels, cross polarization levels, etc. Therefore, there is a communication gap between both communities: optics and microwaves. In the THz regime, which is in between these two communities, researchers must understand both nomenclatures

In this talk, I will explain the operation of lens antennas, their potential, and two innovative techniques that have become very important in recent years. The first technique is transformation optics, which can be employed to produce three-dimensional directive lenses. The second one is metasurfaces, which can be used to produce low-cost and planar two-dimensional lenses. In the case of metasurfaces, fully metallic solutions are possible, which is a clear advantage in terms of losses. However, with the available technology, metasurfaces are only able to scan in one single plane. Finally, we introduce the concept of higher symmetries, that can be employed to enhance the bandwidth of conventional metasurfaces, or to increase their equivalent refractive indexes.


February 15th, 2012

Welcome to the IEEE Northern Canada AP/MTT Jt. Chapter website!

The Antennas and Propagation Society and the Microwave Theory and Techniques Society are two predominant societies in the IEEE with thousands of members, massive international conferences, and numerous publications. This website will contain information on upcoming chapter activities, information about our two parent chapters, and resources for graduate and undergraduate students. Below is a map of the NCS governing area.

 


November 24th, 2021

NASA’s SunRISE: Understanding Solar Particle Storms Using an Array of Cube Satellites

Thursday, Dec. 2 2021, 2:00 pm (MST)

Join Webex via this link: here

Speaker: Jim Lux: SunRISE Project Manager, NASA JPL

Jim Lux is the Project Manager for SunRISE – six smallsats forming a radio interferometer that will image the sun at frequencies below 20 MHz. He managed the development and operations of DHFR, which measured HF signals from 5-30 MHz in a 500km orbit, above the ionosphere. Mr. Lux was the JPL Principal Investigator for NASA’s SCaN Testbed, which was installed on the International Space Station from 2012 to 2019, for which he received the NASA Exceptional Achievement Medal. A licensed professional engineer in California, Mr. Lux has been at JPL for 22 years, following award winning work in physical special effects for film and TV, design and development of electronic warfare and signals identification systems, and large distributed software systems for database and dispatch applications.

Abstract

NASA’s Sun Radio Interferometer Space Experiment (SunRISE) is an array of six small spacecraft, each about the size of a toaster oven, forming a radio interferometer that will image the Sun at frequencies below 25 MHz. The mission has begun implementation phase and will be launched no earlier than July 2023. SunRISE will help us understand our nearest star and better protect astronauts traveling beyond Earth. It will study how the Sun generates and releases giant space weather storms — known as solar particle storms — into planetary space. Besides improving our understanding of the solar system, this ultimately provides better information on how the Sun’s radiation affects the space environment that astronauts must travel through.


October 12th, 2021

Hands-On Automation and Scripting for Ansys Electronics Desktop (AEDT) Using Python

Thursday, Oct. 14 2021, 2:00 pm (MDT)

Join Zoom via this link: here

Speaker: Dr. Sameir Deif

Sameir Deif received the B.Sc. degree in electronics and communication engineering from Mansoura University, Mansoura, Egypt, in 2007, and the M.Sc. degree in electrical engineering specialized in radio frequency (RF)/microwave circuits from the King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, in 2013. He received his Ph.D. degree in planar microwave active and passive sensors research at the University of Alberta, Edmonton, AB, Canada in July 2020. Currently, he has been employed by Ansys since January 2021 as a Verification Engineer II

Abstract

This is a hands-on workshop for Ansys Electronics Desktop (AEDT) users. Two topics will be covered:

  1. How to use built-in scripting (IronPython) for AEDT automation. This includes creating projects, designs, handling design setups, and extracting different types of data.
  2. How to use pyAEDT for the same automation tasks. pyAEDT extends the interact with AEDT API with no limitations on Python version or data post-processing. 


July 12th, 2021

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Speaker: Dr. Rezvan Rafiee Alavi, DVTEST

Rezvan Rafiee Alavi (M’17) received the B.Sc. degree from the University of Tehran in 2009, in electrical engineering, and M.Sc. degree from Iran University of Science and Technology, in 2013, in telecommunication, fields and waves, and Ph.D. from University of Alberta, in 2019. Currently, she is a postdoctoral research fellow with the Intelligent Wireless Technology Laboratory (IWT), University of Alberta, and DVTEST. Inc. She is also a cofounder of Anteligen Company. She has authored more than 20 papers published in refereed journals and conferences proceedings and also three patents during her Ph.D. and postdoctoral research. Dr. Alavi was a recipient of Mary Louise Imrie Graduate Student Award, honorable mention award in APS/URSI student paper competition (2019). Her research interests include antenna and propagation, passive and active microwave circuits, numerical methods in electromagnetics, inverse electromagnetic scattering, remote sensing, antenna over the air (OTA) measurements, and the application of machine learning and artificial intelligence in antenna measurement and fault detection of antennas and microwave circuits

Abstract

Near-field to far-field transformation is a method for antenna characterization that computes the metrics defined in far-field by using mathematical transformation. This method makes it possible to have affordable very compact enclosures. Clearly, compared to direct and indirect far-field measurement methods, near-field to far-field transformation requires more near-field data correction and post-processing. This is because the distance between the probe and AUT is close, and also the collected data are used for further calculations. Therefore, any error in the collected data can propagate through all the calculations and decrease the accuracy. To correct the measured near-field data several correction methods are used as probe correction, phase center detection and correction, metallic parts and absorber effects removal. Furthermore, to reduce the measurement and post-processing time, instead of uniform sampling, an adaptive sampling technique is proposed and implemented. This method reduces the measurement and post-processing time to the quarter of the time of the uniform sampling. In this talk, I will present the algorithm and methods we have used for NFFF transformation, NF correction, uniform and adaptive NF data acquisition. We will have a live demo of our measurement setup, adaptive sampling method and Signal Shape software that we have developed for NFFF transformation.


April 23rd, 2021

Date: Wednesday, April 28, 2021

Time: 10:30 pm MDT

Duration: 2 hour

To Join: Visit this https://zoom.us/j/97732126662?pwd=VFV4ajQ5YjEzMXVtWTVpaTh2dmVpdz09

Meeting ID: 977 3212 6662Passcode: waves

Abstract:

Both the scientific and the defense communities wish to receive and process information occupying ever-wider portions of the electromagnetic spectrum. This can often create an analog-to-digital conversion “bottleneck”. Analog photonic channelization, linearization, and frequency conversion systems can be designed to alleviate this bottleneck. Moreover, the low loss and dispersion of optical fiber and integrated optical waveguides enable most of the components in a broadband sensing or communication system, including all of the analog-to-digital and digital processing hardware, to be situated many feet or even miles from the antennas or other sensors with almost no performance penalty. The anticipated presentation will highlight the advantages and other features of analog photonic systems (including some specific systems that the author has constructed and tested for the US Department of Defense), and will review and explain multiple techniques for optimizing their performance.

Dr. Edward I. Ackerman
Vice President of R & D for Photonic Systems, Inc.
Billerica, Massachusetts, USA

Bio:

Edward I. Ackerman received his B.S. degree in electrical engineering from Lafayette College in 1987 and his Ph.D. in electrical engineering from Drexel University in 1994. From 1989 through 1994 he was employed as a microwave photonics engineer at GE’s Electronics Laboratory in Syracuse, New York. From 1995 to July 1999 he was a member of the Technical Staff at MIT Lincoln Laboratory. For both institutions he designed high-performance analog photonic links for microwave communications and antenna remoting applications. Since 1999 he has been Vice President of R & D for Photonic Systems, Inc. of Billerica, Massachusetts. Dr. Ackerman is a Fellow of the IEEE.


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