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How Far is the Far Field? – IEEE
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How Far is the Far Field?

December 13, 2016 @ 18:00 - 20:00

The Long Island Chapter of the IEEE Antennas & Propagation Society is pleased to announce the lecture:


presented by  John S. Asvestas


Please note, the date of the presentation changed to:
Tuesday, December 13th 2016 at 6:00pm

This seminar is free and all are invited.  Attendees must be US citizens or legal permanent residents and a drivers license Photo ID must be presented for entrance to the meeting. Food & Refreshments will be served at 6:00pm, and lecture starts 6:30pm.


We develop a new formula for determining the far-field region of a radiator / scatterer. We arrive at this formula by examining the integral representation of the magnetic field scattered by a thin, straight wire. The formula consists of three distinct parts that result from bounding the errors on the amplitude and phase of the free-space Green’s function and the error in dropping one of the two terms in the integral representation. It is more general than the existing formula and avoids the pitfall of the distance to the far field going to zero with the characteristic dimension of the object.

Speaker Biography:

John S. Asvestas was born in Athens, Greece. He received the B.S.E., M.S.E., and Ph.D. degrees in Electrical Engineering from The University of Michigan, Ann Arbor, in ’63, ’65, and ’68, respectively. He has worked at The University of Michigan Radiation Laboratory, the Technical University of Denmark Applied Mathematical Physics Laboratory, the Radar Systems Group of Hughes Aircraft Company (currently Raytheon), and the Corporate Research Center of Grumman Corporation (currently Northrop/Grumman). He has also taught at the University of Delaware, UCLA, and the Technical University of Crete. He retired in Jan. 2016 after 20 years with NAVAIR’s Radar and Antenna Systems Division, Patuxent River, MD. His main interest is in analytical and computational electromagnetics. He has made contributions to physical optics and the physical theory of diffraction, solutions of large systems of equations, the interaction of acoustic and electromagnetic waves for counter-stealth applications, water waves, and the method of moments.

Dr. Asvestas is an IEEE Life Fellow and a NAVAIR Fellow. He has been a past president of APS, Long Island, and a member and Chair of the Government Executive Committee of the Electromagnetic Code Consortium.

He is the recipient of a 2008 NAWCAD Commander’s Award, a 2009 Dr. D. M. Etter Top Navy Scientists and Engineers of the Year Award, a 2012 Small Business Innovative Research (SBIR) People’s Choice Award, and a 2016 Department of the Navy Meritorious Civilian Service Award.



This lecture will be held at BAE Systems located at 450 Pulaski Road, Greenlawn, NY.

The facility is located just east of Park Ave (Suffolk County Rte 35) on Pulaski Road.



Registration is required, and is available online only. Registration can be done IEEE vTools The lecture is free.  Attendees must be US citizens and a drivers license Photo ID must be presented for entrance to the meeting.


Seminar Coordinator:

Bryan Tropper, Chair of the IEEE APS Society, LI Section


December 13, 2016
18:00 - 20:00
Event Category:


IEEE Antennas & Propagation Society Long Island Chapter


BAE Systems
450 Pulaski Road
Greenlawn, NY
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