Fundamentals of Advanced Reverberation Chamber
On Wednesday, January 17, 2017 a special workshop on the Fundamentals of Advanced Reverberation Chamber test options will be held at the NTS Fullerton facility. Sponsored by ETS Lindgren and NTS Fullerton, this workshop will allow you to fully understand how to utilize reverberation chambers as a versatile test environment, wireless device testing inside of chambers and how to use a these types of chambers to calibrate electric field probes.
Register today for this free event which is open to IEEE members, those who are interested in becoming members, as well as anyone interested in learning more about reverberation chamber principles. Note that seating is limited on a first come, first serve basis.
Reserve your seat today – space is limited!
This is a free workshop, but you must register in advance no later than Friday, January 12 to ensure adequate seating and catering.
Michael Shook, NTS Fullerton General Manager, Direct: 714-879-6110
12:00pm – Complimentary Lunch
1:00pm – Presentations
4:00pm – Demonstrations of testing in a reverb chamber
Presentation 1: Utilizing Reverberation Chambers as a Versatile Test Environment for Assessing the Performance of Components and Systems
Instructed By: Dennis Lewis
Electromagnetic reverberation chambers have been used for many years by the Electromagnetic Compatibility (EMC) community to measure the susceptibility and emissions for various electronic components and systems. This presentation describes how statistical processes were used to reduce the uncertainty of these chambers to a level necessary for precision metrology applications. These processes were applied to the calibration of electromagnetic field probes and the assessment of antenna efficiencies. A brief comparison of traditional calibration methods employing transverse electromagnetic (TEM) cells and anechoic chambers to the new statistical reverberant environment will be shown. The presentation also goes on to explain how these techniques were later applied to a wide variety of aircraft measurements. A technique, which utilizes two side-by-side reverberation chambers sharing a common wall with an arbitrary shaped aperture, useful for the assessment of component shielding, will be discussed. Utilizing this same approach, it is possible to assess the shielding of large structures such as commercial aircraft. These aircraft shielding measurements are necessary for High Intensity Radiated Field Susceptibility (HIRF) certifications. With the proliferation of wireless devices, it is important to understand how they behave in complex electromagnetic environments and how they interact with other devices and systems in which they are collocated. Aircraft environments have been shown to behave similarly to reverberation chambers and therefore these techniques can be employed to study propagation environments and system interactions. This presentation will give examples of how these techniques were employed to measure bulk absorption used to simulate passenger loading of aircraft, field mapping which is useful for the evaluation of signal coverage and channel interference as well as signal propagation characteristics.
Presentation 2: An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers
Instructed By: Kate Remley
When the antenna is integrated into the body of a wireless device, as it is for cell phones and many other portable devices, performance testing is typically done under free-field conditions. In this overview presentation, we will discuss free-field characterization of some key wireless-device parameters by use of reverberation chambers. We will discuss recent research and some of the issues related to the use of these chambers for testing devices that transmit modulated signals.
Presentation 3: Introduction to Reverberation Chamber Concepts and its Application for Probe Calibration and Antenna Efficiency Measurements
Instructed By: Dennis Lewis
This presentation gives a brief introduction of current methods used to calibrate electric field probes as defined by IEEE Standard 1309 as well as a brief discussion of some inherent problems with the current test methods. The use of a reverberation chamber to calibrate electric field probes is described as an alternative method along with some of the tradeoffs between methods. The use of modal, spatial, and frequency averaging to improve field uniformity levels to that required for accurate antenna efficiency characterizations are also outlined.
About the Speakers
Dennis Lewis, Technical Fellow
Boeing | Seattle, Washington
Dennis received his BS EE degree with honors from Henry Cogswell College and his MS degree in Physics from the University of Washington. He has worked at Boeing for 29 years and is recognized as a Technical Fellow. He currently has leadership and technical responsibility for the primary RF, Microwave and Antenna Metrology labs. Dennis holds eight patents and is the recipient of the 2013 & 2015 Boeing Special Invention Award. He is a member of the IEEE and several of its technical societies including the Microwave Theory and Techniques Society (MTT-S), the Antennas and Propagation Society and the Electromagnetic Compatibility (EMC) Society. He serves as a Board Member and is a past Distinguished Lecturer for the EMC Society. He is a Senior Member, serves as Vice President on the Board of Directors for the Antenna Measurements Techniques Association (AMTA), and chaired its annual symposium in 2012. Dennis is a part time faculty member teaching a course on Measurement Science at North Seattle College and is chair of the Technical Advisory Committee. His current technical interests include aerospace applications of reverberation chamber test techniques as well as microwave measurement systems and uncertainties.
Kate Remley, Leader of the Metrology for Wireless Systems Group
National Institute for Science and Technology | Boulder, Colorado
Kate was born in Ann Arbor, MI. She received the Ph.D. degree in Electrical and Computer Engineering from Oregon State University, Corvallis, in 1999. From 1983 to 1992, she was a Broadcast Engineer in Eugene, OR, serving as Chief Engineer of an AM/FM broadcast station from 1989-1991. In 1999, she joined the RF Technology Division of the National Institute of Standards and Technology (NIST), Boulder, CO, as an Electronics Engineer. She is currently the leader of the Metrology for Wireless Systems Group at NIST, where her research activities include development of calibrated measurements for microwave and millimeter-wave wireless systems, characterizing the link between nonlinear circuits and system performance, and developing standardized test methods for RF equipment used by the public-safety community. Dr. Remley was the recipient of the Department of Commerce Bronze and Silver Medals, an ARFTG Best Paper Award, and is a member of the Oregon State University Academy of Distinguished Engineers. She was the Chair of the MTT-11 Technical Committee on Microwave Measurements from 2008 – 2010 and the Editor-in-Chief of IEEE Microwave Magazine from 2009 – 2011, and is the Chair of the MTT Fellow Nominating Committee