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Thoughts, Tips and Techniques for Microwave Circuit Design

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  • Visitor Seminars
When Apr 27, 2012
from 08:45 AM to 04:30 PM
Where Engr. IV Bldg. Maxwell Room 57-124
Contact Name
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Dr. Robert L. Eisenhart




This one-day seminar provides interested students in-depth training on microwave design, focusing on the use of modern Electromagnetic Simulator computer programs as design tools. Operating knowledge of these tools is not a prerequisite to benefit from the presentation.  However, the value of using these programs in the design of circuits will become apparent.  The primary EM tool being used is ANSYS HFSS which is available at most universities.  The seminar is lecture format, not involving the software directly in the presentation but referred to as appropriate.  There is no "hands-on" computer instruction.


The subject matter covers a variety of topics associated with microwave circuit design including various types of transmission lines, transitions from one type line to another, components and antennas.  Attendees will learn how to approach microwave design with consideration of impedance, the electromagnetic fields, and the power of 3D EM field simulation. This is not about the software, but shows how it can be applied to design.  It assumes that attendees have a basic familiarity with microwaves so that they can follow the flow of the discussion.  The lecture approach is informal and inter­active, welcoming questions to promote discussion.



·   Defining the Design Process – isolating critical issues

·   Transmission Lines - circuit building blocks, impedance, propagation constant, modes (types and characteristics)

·   Interconnects - getting from one type line to the other, coax to waveguide, microstrip, slotline, - circuit isolation.

·   Waveguide Components - circuits  including - Mode converters, polarizers, orthomode transducers, power splitters and filters

·   Antennas - Single elements including dipoles, horn, cross-dipoles and waveguide slots.  Arrays, broadside and scanned beams.

·   Complex Antenna System Design - dual polarization / common aperture - example design from start to finish



9:00 am – Introductory Comments and Transmission Lines

10:20 am – Circuit Connections and Planar Ckt. Issues

11:50 – Lunch Break

12:20 pm – Waveguide (Enclosed) Circuits

1:50 pm – Antennas Single Elements & Arrays

3:15 pm – Antenna System Design From Start to Finish




Robert L. Eisenhart has been an independent consultant in microwave circuit design for 17 years, dealing primarily with types of circuits that cannot be modeled with equivalent circuits such as waveguides, transmission lines, antennas etc.  Previously with Hughes Aircraft as a Chief Scientist, he provided technical direction and management of IR&D programs.  He received his PhD in 1970 from the University of Michigan and his BSEE in 1960 from Rensselaer Polytechnic Institute. 


Bob has been using EM simulators since they came out in the early 1990s.  He has taught classes and given more than 20 presentations featuring HFSS on a variety of subjects as a design tool.  He was responsible for the initial development of the procedure for using simulators to model scanning characterization of antenna arrays.   He is an IEEE Life Fellow, and in 1999 received the MTT-S Microwave Pioneer Award for the work presented in his PhD thesis.  Website:

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