Dr. Steven Weiss, Instructor
Summary
This two-day course teaches the basics of antenna and antenna array theory. Fundamental concepts such as beam patterns, radiation resistance, polarization, gain/directivity, aperture size, reciprocity, and matching techniques are presented. Different types of antennas such as dipole, loop, patch, horn, dish, and helical antennas are discussed and compared and contrasted from a performance/applications standpoint. The locations of the reactive near-field, radiating near-field (Fresnel region), and far-field (Fraunhofer region) are described and the Friis transmission formula is presented with worked examples. Propagation effects are presented. Antenna arrays are discussed, and array factors for different types of distributions (e.g., uniform, binomial, and Tschebyscheff arrays) are analyzed giving insight to sidelobe levels, null locations, and beam broadening (as the array scans from broadside.) The end-fire condition is discussed. Beam steering is described using phase shifters and true-time delay devices. Problems such as grating lobes, beam squint, quantization errors, and scan blindness are presented. Antenna systems (transmit/receive) with active amplifiers are introduced. Finally, measurement techniques commonly used in anechoic chambers are outlined. The textbook, Antenna Theory, is included as well as a comprehensive set of course notes.
Instructor
Dr. Steven Weiss is a senior design engineer with the Army Research Lab in Adelphi, MD. He has a Bachelor's degree in Electrical Engineering from the Rochester Institute of Technology with Master's and Doctoral Degrees from The George Washington University. He has numerous publications in the IEEE on antenna theory. He teaches both introductory and advanced, graduate level courses at Johns Hopkins University on antenna systems. He is active in the IEEE and is presently on the steering committee for the Antennas and Propagation Conference for 2005. In his job at the Army Research Lab, he is actively involved with all stages of antenna development from initial design, to first prototype, to measurements. He is a licensed Professional Engineer in both Maryland and Delaware.
What You Will Learn
This course is invaluable to engineers seeking to work with experts in the field and for those desiring a deeper understanding of antenna concepts. At its completion, you will have a solid understanding of the appropriate antenna for your application and the technical difficulties you can expect to encounter as your design is brought from the conceptual stage to a working prototype.
Course Outline
DAY 1
8:00 - 10:00 — Basic concepts in antenna theory: beam patterns, radiation resistance, polarization, gain/directivity, aperture size, reciprocity, and matching techniques.
10:00 - 10:15 — Break
10:15 - 12:00 — Further discussion of basic concepts. Locations of the reactive near-field, radiating near-field (Fresnel region), and far-field (Fraunhofer region) and the Friis transmission formula.
12:00 - 1:00 — Lunch
1:00 - 3:00 — Dipole, loop, patch, horn, dish, and helical antennas are discussed, compared, and contrasted from a performance/applications standpoint
2:00 - 2:15 — Break
2:15 - 5:00 — Propagation effects: direct, sky, and ground waves. Diffraction and scattering.
10:00 - 10:15 — Break
10:15 - 12:00 — Sidelobe levels, null locations, and beam broadening due to scanning from broadside. The end-fire condition is discussed. Problems such as grating lobes, beam squint, quantization errors, and scan blindness are presented.
12:00 - 1:00 — Lunch
1:00 - 3:00 — Beam steering is described using phase shifters and true-time delay devices. Some commonly used components and delay devices (e.g., the Rotman lens) are compared.
2:00 - 2:15 — Break
2:15 - 5:00 — Measurement techniques commonly used in anechoic chambers are outlined: pattern measurements, polarization patterns, gain comparison test, spinning dipole (for CP measurements). Items of concern relative to anechoic chambers such as the quality of the absorbent material, quiet zone, and measurement errors are detailed. Also mentioned are compact, outdoor, and near-field ranges. A question and answer period will conclude the session.
DAY 2
8:00 - 10:00 — Antenna arrays are discussed, and array factors for different types of distributions (e.g., uniform, binomial, and Tschebyscheff arrays)
Tuition
Tuition for this two-day course is $990 per person at one of our scheduled public courses. Onsite pricing is available. Please call us at 410-531-6034 or send an email to ati@ATIcourses.com.
You are invited to visit Satellite Engineering Research Corporation to learn more about satellite engineering its president, Dr.Robert A. Nelson.