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Reverberation Chamber Theory Course

The course is hosted by the School of Electrical and Computer Engineering of Oklahoma State University. Technical and equipment support is provided by the Naval Surface Warfare Center, Dahlgren Division (NSWCDD), Dahlgren, VA.

Course Background

Several standards including MIL-STD 461E, RTCA DO 160D, IEC 61000-21, and SAE J551/J113 permit the use of reverberation chambers for EMC certification testing. The recommended test methods for environmental standard testing for UAS systems closely follows the existing MIL and DO 160 standards. This comprehensive course will provide an awareness of all aspects usage of reverberation chambers for EMC testing as a route to compliance.
 
This course is designed for engineers and technicians who will be involved in radiated emission or immunity testing of commercial or military systems using reverberation chambers. The course will also be valuable to personnel evaluating the use of reverberation chambers as a complement to or replacement for other types of radiated test facilities.
 
The theory portion covers the statistical nature of reverberation chamber testing, characterization of the EM test conditions, and the tradeoff between uncertainty in test results and test time. The experimental portion includes demonstrations, test setups and instrumentation, statistical sampling techniques (mechanical tuner operation and frequency sweeps), and chamber characterization and calibration measurements. While the experimental portion includes reverberation chamber demonstrations it consists primarily of a series of hands-on experiments conducted in 4 to 5 person groups. The notes format includes the objective, a description of the experiment, instrumentation, test setup, procedures, and room for specific measurements, analyses, results, and conclusions. The experiments and demonstrations are conducted in the small (2.5 x 4 x 7 feet) OSU reverberation chamber and an ETS-Lindgren SMART 80 chamber. The small chamber, constructed in-house by OSU students for less than $1000, indicates the flexibility of the reverberation chamber concept. The small chamber can be used for radiative immunity and emission testing above 1 GHz in accordance with several standards. The chamber demonstrates the statistical equivalence of the electromagnetic environment in all conductive cavities independent of size and construction materials. Participants will have a thorough understanding of the operation of a reverberation chamber for EMC testing. They will have developed a test plan for an immunity test with specified conditions and objectives. They will also have a permanent record of data collected and analyzed, and an extensive set of notes.
 

Course Outcome

Participants will have a thorough understanding of the operation of a reverberation chamber for EMC testing. They will have developed a test plan for an immunity test with specified conditions and objectives.  They will also have a permanent record of data collected and analyzed, and an extensive set of notes.

Course Details

  • Participant Requirements

    The class will start with administrative items at 0800, 16 October 2017 on the OSU campus and will end at 1700,  20 October 2017. A local area map and lodging options will be provided with registration. 

     

    Both in-class problems and analyses of experimental data will require a computer with a spreadsheet application program capable of reading ASCII files. Data for problems will be provided to each participant on a CD, a USB flash memory, or 3.5" floppy disks.  Experimental data collected by each group can be copied from a CD, a USB flash memory, or 3.5" floppy disk.

     

    Participants should bring a laptop computer and be familiar with a spreadsheet application program including data manipulation and plotting (EXCEL will be the spread sheet program uses in the presentation).  In particular, participants should be able to perform the following analyses on data sets: maximum, average, minimum, standard deviation, and correlation coefficient. 

     

    Participants should also bring a hand calculator for evaluation of simple problems during class

     

    Note: The course length is 5 days (8:00AM - 5:00PM Monday - Thursday; 8:00AM - 3:00PM Friday). This is an intensive course and after-hours work on exercises is expected. To gain full benefit from the course, please plan to attend the entire course through 3:00PM Friday.

  • Presenters

    Dr. Gus Freyer

    Gustav Freyer has over 30 years experience in test and evaluation.  For over 15 years he was involved in characterization of the electromagnetic environment in reverberation chambers. He participated in many cavity characterization tests as well as equipment and full system tests.  He participated in the first full aircraft, Hazards of Electromagnetic Radiation to Ordnance, test in a reverberation chamber. He developed a Data Base of approximately 20 reverberation chambers worldwide. He developed this unique course on reverberation chambers and has presented it numerous times both nationally and internationally. He has authored or co-authored numerous papers and technical reports on topics related to reverberation chambers.  Mr. Freyer has a BS Eng., a MS Nuc Eng., and a Ph.D. in Physics.

     

    Dr. Charles F. Bunting

    Bunting received the A.A.S. degree in electronics technology from the Tidewater Community College, Norfolk, VA, in 1985, the B.S. (honors) degree in engineering technology from the Old Dominion University, Norfolk, in 1989, and the M.S. and Ph.D. degrees in electrical engineering from the Virginia Polytechnic Institute and State University, Blacksburg, in 1992 and 1994, respectively. From 1981 to 1989, he was with the Naval Aviation Depot, Norfolk, first as an apprentice, then an electronics mechanic, and later an electronics measurement equipment mechanic. From 1991 to 1994, he held a Bradley Fellowship and a DuPont Fellowship. From 1994 to 2001, he was an Assistant/Associate Professor at the Old Dominion University, where he worked closely with NASA Langley Research Center on electromagnetic field penetration in aircraft structures and reverberation chamber simulation using finite element techniques. Since 2001, he is an Associate Professor at Oklahoma State University, Stillwater. His research interests include fundamental variational principles and computational electromagnetics, statistical electromagnetics, electromagnetic characterization and application of reverberation chambers, and the analysis of optical and microwave structures using numerical methods including finite element techniques.

     

    Dr. Vignesh Rajamani

    Dr. Rajamani is an expert in the electromagnetic characterization and application of reverberation chambers. His other research interests includes statistical electromagnetics, validation, and optimization techniques for computational electromagnetics, communication system test in complex multipath environments, EMI/C Issues with Unmanned Aerial Systems, antenna systems and radio frequency (RF) design, and estimation probability of failure of electronic systems due to electromagnetic interference and compatibility.

     

    Dr. Rajamani is the Vice President of Member Services for the IEEE Electromagnetic Compatibility (EMC) Society and involved with several technical committees and educational activities through the EMC Society. He is a Senior Member of IEEE and served as a distinguished lecturer for the IEEE EMC Society for term 2013-2014. He has lectured around the world on reverberation chamber test methodologies and has taught design engineering seminars for faculty and students at many universities focusing on challenges in engineering education and prepare the faculty to handle them by spreading a significant number of Project Based Learning (PBL) classes across the curriculum. Prior to joining Exponent, Dr. Rajamani was with Oklahoma State University as a Visiting Assistant Professor where he taught courses in engineering design and performed research in probability of failure of electronic systems in harsh electromagnetic environments.

  • Daily Agenda

    Day 1 (0800-1700)

    • REGISTRATION

    • OPENING REMARKS & ADMINISTRATIVE ITEMS

    • COURSE OVERVIEW

    • INTRODUCTION TO REVERBERATION CHAMBERS

    • TEST PLANNING PROBLEM DEFINITION

    • OVERVIEW OF STATISTICS SIGNIFICANT FOR REVERBERATION CHAMBERS

    • LUNCH

    • OVERVIEW OF STATISTICS SIGNIFICANT FOR REVERBERATION CHAMBERS (CONT)

    • THEORY I

    • CAVITY MODAL STRUCTURE

    Day 2 (0800-1700)

    • REVIEW/DISCUSSION OF STATISTICS SESSION

    • CAVITY MODAL STRUCTURE (CONT)

    • CHAMBER EXCITATION I

    • TEST SETUP

    • CHARACTERIZATION MEASUREMENTS

    • LUNCH

    • CHARACTERIZATION MEASUREMENTS (CONT)

    • EXPERIMENT 1 TEST SETUP & TYPICAL MEASUREMENTS

    • OPTIONAL DISCUSSION OF THEORY AND/OR EXPERIMENTAL DATA AND ANALYSIS TECHNIQUES

    Day 3 (0800-1700)

    • REVIEW OF EXPERIMENT1

    • THEORY II

    • CHAMBER CHARACTERIZATION

    • LUNCH

    • CHAMBER CHARACTERIZATION (CONT)

    • EXPERIMENT 2 CHAMBER CALIBRATIONS

    • OPTIONAL DISCUSSION OF THEORY AND/OR EXPERIMENTAL DATA AND ANALYSIS TECHNIQUES

    Day 4 (0800-1700)

    • REVIEW OF EXPERIMENT 2

    • EXPERIMENT 3 IMMUNITY TESTING

    • QUALITY FACTOR

    • LUNCH

    • QUALITY FACTOR EFFECTS

    • EXPERIMENT 4 EMISSIONS & PULSE TESTING

    • OPTIONAL DISCUSSION OF THEORY AND/OR EXPERIMENTAL DATA AND ANALYSIS TECHNIQUES

    Day 5 (0800-1700)

    • REVIEW OF EXPERIMENTS 3 & 4

    • EUT BANDWIDTH EFFECTS

    • TUNER DESIGN

    • INDEPENDENT SAMPLES

    • STATISTICAL EQUIVALENCE

    • CHAMBER UNIFORMITY

    • WORKING VOLUME

    • DIRECTIVITY / POLARIZATION EFFECTS

    • REVIEW OF ANALYSES AND PROBLEM SETS

    • LUNCH

    • * TEST PLANNING PROBLEM RESULTS

    • ** EUT COUPLING MEASUREMENTS
      ** SHIELDING EFFECTIVENESS MEASUREMENTS
      ** SCALAR POWER DENSITY
      ** CHAMBER DESIGN ISSUES
      ** CORRELATABILITY BETWEEN TEST TECHNIQUES
      ** CHAMBER EXCITATION II

    • CLOSURE
      COURSE EVALUATION FORMS
      COURSE ENDS

    * GROUP PRESENTATION

    ** OPTIONAL TOPICS BASED ON PARTICIPANT INTEREST AND TIME AVAILABLE

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