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IEEE Santa Clara Valley
Antennas and Propagation Society

 

We are looking for speakers for future meetings.

 

If you would like to make a presentation, please send an e-mail to: greg.manassero@ieee.org

It is not required that you be a member of IEEE to make a presentation or to attend.

Chapter Meeting:

 

Date: Tuesday March 14, 2006

Location: Cogswell College (Boardroom), 1175 Bordeaux Dr., Sunnyvale, CA 94089

Directions:  Map to Cogswell College

Time: 6:00 Pizza and Soda, 6:30 Presentation Begins

Cost: Free

Title: Antenna Impedance Models

Speaker: Stephen D. Stearns, Northrop Grumman, Electromagnetic Systems Laboratory

 

Presentation Abstract:
Although modern EDA and circuit programs can work with tabulated impedance data directly, there remain situations where a tabulated representation isn't useful. In this talk we consider antenna impedance models and their uses. Published models for monopoles and dipoles are compared and new ones introduced. Models that are positive-real rational functions yield realizable equivalent circuits. A common textbook equivalent circuit for a monopole or dipole near resonance is shown to be the least accurate. However, two low-order equivalent circuits have been found that track the impedance through a complete revolution on the Smith chart, i.e. from d-c to well past the first resonance, and nearly the first antiresonance. More complicated "broadband" models that track antenna impedance through multiple resonances are also examined.

Speaker Biography:
Mr. Stearns has been with Northrop Grumman Mission Systems (formerly TRW), Electromagnetic Systems Laboratory, in San Jose since 1990, where he is Senior Staff Engineer. Before that, he was Senior Scientist at Technology for Communications International for two years and Senior Member of the Technical Staff at GTE Government Systems Corporation in Mountain View for 14 years. He also worked at Probe Systems Inc. in Sunnyvale and Hughes Aircraft Company Ground Systems in Fullerton. He attended Stanford University, the University of Southern California, and California State University Fullerton where he studied electromagnetics under Prof. G.I. Cohn.?Mr. Stearns is a Senior Member of the IEEE, has over 50 publications and presentations, and holds seven U.S. patents for cochannel signal processing technology. He holds two federal FCC licenses:? Amateur Extra class and commercial General Radio Operator with Radar Endorsement, and he has held Novice, Technician, and 1st Class Radiotelephone licenses.?He writes a column on topics in electromagnetics and antennas, and serves as a reviewer for an IEEE Transactions journal.

 

These meetings are open to the public and you do not have to be an IEEE member to attend. To become a member of the IEEE, follow this link: http://www.ieee.org/membership/join/

 

Past Meetings:

March 14, 2006: Antenna Impedance Models, Stephen D. Stearns

Dec 13, 2005: Radiation of Impulse-Like Waveforms With Illustrative Applications, Dr. D. V. Giri

Nov 16, 2005: Ultra-wideband Communications in Harsh Propagation Channels, Dr. Faranak Nekoogar

June 21, 2005: Ultrawideband Radar Methods and Techniques for Through Barrier Imaging, Dr. John Chang

May 10, 2005: Terahertz Radiation via IC Technology – For more information, contact Dr. Yasser Hussein

April 13, 2005: A Spatial Channel Model for Multiple Antenna Systems, Dr. Ada Poon

 

2006 IEEE Antennas and Propagation Society International Symposium:

July 9-14, 2006

Albuquerque, New Mexico

Website: http://www.eece.unm.edu/apsursi2006/

 

Helpful Links:
Main IEEE Webpage: http://www.ieee.org/
APS Webpage: http://www.ieeeaps.org/
Santa Clara Valley IEEE Webpage, Chapter Information and Job Listings: http://www.ieee.org/scv/
Find out about Bay Area IEEE chapter activities in the GRID: http://www.e-grid.net

We appreciate the speakers presenting at our monthly technical meetings. If you are interested in making a presentation at one of our meetings please contact any of the officers listed below.

Officers for 2006

Chair

Vice-Chair

  • Paul Hoover
    Randtron Antenna Systems
    Tel: (650)326-9500

Secretary / Treasurer

  • Charles Brown
    Lawrence Livermore Laboratories
    Tel: (925)423-4435

 

 

 

    

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SCV Antennas and Propagation Society Webmaster: Greg Manassero (greg.manassero@ieee.org)

http://ewh.ieee.org/r6/scv/aps
(Modified: March 21, 2006 )