A look at a novel Antenna design
Antennas are a key component for communications, both for receiving and transmitting, and there is a certain fascination with their design. It all started with the Hertzian dipole and its understanding and mathematical treatment. This presentation is based, in part, on modern mathematical tools as well as test equipment. As an example, Hallén wrote his famous integral equation to give an exact treatment of antenna current wave reflection at the end of a tube-shaped cylindrical antenna in 1956, but his first work on this subject probably goes back to 1938.
This equation enabled him to show that on a thin wire, the current distribution is approximately sinusoidal and propagates at nearly the speed of light. For this treatment, that is an important contribution We will learn here that by optimizing the effective length of a rod antenna it will become directional and will have a radiation pattern that provides gain. Antenna tuning is important for field operation. Dr. Tapan Sarkar, past IEEE AP-S president, Dr. Jim Breakall, Dr. Ajay K. Poddar, and I met several times in the past 30 years, discussed my pet project: positioning of antennas for portable operation, and we had many exchanges on this topic and sunspots and their effect on HF propagation. Dr. Tapan Sarkar passed away in 2020, but his scientific contributions in the field of Antenna and Propagation will be helpful to researchers and next-generation students in the field of wireless communication, especially applications in humanitarian technology. Now, Sun Cycle 25 is building an increasingly favoring radio operation in the HF band (1.5 to 30 MHz). There are military and other radio applications for 5 to 20-W battery-operated radios with whip antennas that make the radio portable. A whip antenna has no ground return, or proper counterpoise so it is not optimized for signal propagation. Thus, some users drag a wire behind them. This solution is not ideal. We explore optimizing antenna performance for HF, VHF, and UHF (spanning 1.5 to 512 MHz) manpacks and using an antenna tuning unit (ATU). Battery-operated manpacks with internal ATUs were used for testing, comparing internal ATUs with the performance obtained using external tuners. The necessary mathematical treatment for this case is provided here. Prof. Sarkar was involved with the modeling software WIPL-D and HOBBIES. Some anecdotes will be provided, with interactions with him on these, including numerous projects supported by IEEE SIGHT (Special interest Group on Humanitarian Technology) under the leadership of Dr. Ajay Poddar, Chair IEEE Humnatrain Activity Committee Inter-Society and Region Coordinator, IEEE AP, and MTT Societies. Dr. Tapan Sarkar and Dr. Ajay Poddar helped in establishing three IEEE awards for supporting students and young engineers working on Antenna and Microwave Theory and Technology: (1) IEEE Ulrich L. Rohde Innovative Conference Paper Awards on Antenna Measurements and Applications (This annual cash award and plaque, are given to the two most innovative conference papers presented at the annual topical meeting on Antenna Measurements and Applications), (2) IEEE Ulrich L. Rohde Innovative Conference Paper Awards on Computational Techniques in Electromagnetics (This annual cash award and plaque, are given to the two most innovative conference papers presented at the annual topical meeting on Computational Techniques in Electromagnetics), and (3) IEEE IEEE Ulrich L. Rohde Humanitarian Technical Field Project Award, USD 20,000 project award given annually by IEEE AP Society.
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- Date: 06 Oct 2022
- Time: 01:00 PM to 01:45 PM
- All times are (UTC-04:00) Eastern Time (US & Canada)
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- 16 Eagle Rock Avenue
- East Hanover, Pennsylvania
- United States 07936
- Building: Hanover Manor
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Dr. Ajay K. Poddar, Chair IEEE North Jersey Section, Email: akpoddar@ieee.org
- Starts 20 September 2022 12:30 PM
- Ends 06 October 2022 11:55 PM
- All times are (UTC-04:00) Eastern Time (US & Canada)
- No Admission Charge
Speakers
Dr.Ulrich L. Rohde of Rohde & Schwarz, Munich, Germany
A look at a Novel Antenna Design
Biography:
Prof. Dr. Ing. habil Ulrich L. Rohde is a Partner of Rohde & Schwarz, Munich Germany; Chairman of Synergy Microwave Corp., Paterson, New Jersey; President of Communications Consulting Corporation; serving as an honorary member of the Senate of the University of the Armed Forces Munich, Germany honorary member of the Senate of the Brandenburg University of Technology Cottbus–Senftenberg, Germany; past member of the Board of Directors of Ansoft Corporation, Pittsburgh, Pennsylvania. Dr. Rohde is serving as a Professor of Radio-Microwave Frequency Theory and Techniques at several universities worldwide, to name a few: an Honorary Professor IIT-Delhi, an Honorary Chair Professor IIT-Jammu, a Professor at the University of Oradea for microwave technology, an honorary professor at the BTU Cottbus-Senftenberg University of Technology, and professor at the German Armed Forces University Munich (Technical Informatics ).
Rohde has published 300+ scientific papers, co-authored over dozen books, and over dozens of patents; received several awards, to name a few: recipient of the 2019 IETE Fellow Award, 2019 IEEE CAS Industrial Pioneer Award; 2017 RCA Lifetime achievement award, 2017 IEEE-Cady Award, 2017 IEEE AP-S Distinguished achievement award, 2016 IEEE MTT-S Applications Award, 2015 IEEERabi Award, 2015 IEEE Region-1 Award, and 2014 IEEE-Sawyer Award. Dr. Ulrich Rohde is the recipient of the “2021 Cross of Merit of the Federal Republic of Germany. The Order of Merit of the Federal Republic of Germany, also known as the Federal Cross of Merit, is the highest tribute the Federal Republic of Germany can pay to individuals for services to the nation.
Address:New Jersey, United States
Dr. James Breakall of Penn State University
History of Antenna and Associated Engineering Technology at the Arecibo Observatory
Biography:
Dr. James K. Breakall (WA3FET) received B.S. and M.S. degrees in Electrical Engineering from Penn State University and a Ph.D. in Electrical Engineering and Applied Physics from Case Western Reserve University, Cleveland, OH, and has over 45 years of experience in numerical electromagnetics and antennas. He was a Project Engineer at the Lawrence Livermore National Laboratory (LLNL), Livermore, CA, and an Associate Professor at the Naval Postgraduate School (NPGS), Monterey, CA. Presently he is a Full Professor of Electrical Engineering at Penn State. Dr. Breakall was first at Arecibo Observatory in 1974 as the first Summer Student from Penn State. He worked with Dr. Rolf Dyce (Associate Director) on the design of the 100 ft dish at Higuillales that was used as an interferometer with the main 1000 ft dish. In 1977, he was an NSF Resident graduate student at the Arecibo Observatory in Puerto Rico working with Prof. John Mathews and Dr. Suman Ganguly in his Ph.D. research on antenna analysis and radar probing of the ionosphere using the 430 MHz incoherent scatter. At LLNL, he and his group worked on the development of the Numerical Electromagnetics Code (NEC), the first sophisticated antenna modeling program. Other significant projects that he has worked on were the designs of the HAARP facility in Alaska (patent received), both HF facilities at Arecibo (Islote and the recent Cassegrain sub-reflector design), and multiple feeds for inside the Gregorian Dome. He received a patent and the R&D 100 Award for the Kinstar low-profile AM broadcast antenna. He has been and is a consultant to the Army, Air Force, and Navy, and Industry on antenna design and radio propagation. He also has designed many Amateur Radio commercial antennas including the very popular Ham Radio Skyhawk Yagi antenna, and he is the inventor of the Optimized Wideband Antenna (OWA). Dr. Breakall is also a life senior member of the IEEE Antennas and Propagation Society, IEEE Broadcast Technology Society, Eta Kappa Nu, International Union of Radio Science Commission B, IEEE Wave Propagation and Standards Committee has been an Associate Editor for the Radio Science journal, and served as an Arecibo Observatory Users and Scientific Advising Committee Member. He has been a frequent speaker at the Dayton Hamvention Antenna Forum and has built two major contest super-stations near Penn State and on his farm in Puerto Rico near the big Arecibo dish. He has graduated numerous graduate students and received many awards over the years. In 2017, Dr. Breakall was awarded the prestigious Sarnoff Citation from the Radio Club of America (RCA), the oldest wireless society. He was elected as a Director to the Board in 2018 and 2021 and is the Chairman of their Technical Symposiums. He also serves on the RCA Scholarship Committee. He will be awarded Fellow this coming November.
Email:
Address:225 Electrical Engineering East, , University Park, United States, 16802