By Topic

The Minimum Q for Spheroidally Shaped Objects: Extension to Cylindrically Shaped Objects and Comparison to Practical Antennas

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Peder Hansen ; SPAWAR Systems Center, Pacific, San Diego, CA 92152-5001, USA ; Richard Adams

The classic work of Chu and others has been extended to determine the minimum radiation Q for the TM case of electrically small antennas contained within a spheroid (prolate and oblate) with no energy stored inside. The results of numerical calculations have been used to give an analytic formula that can be used to determine the electrically small bound on Qr as a function of aspect ratio for prolate and oblate spheroids. These formulas have been used to develop a lower bound for antennas contained within a cylinder, and a comparison has been made to several practical antennas as a function of aspect ratio. An antenna suggested by Wheeler is shown to have the best (lowest), Qr of the antennas examined over a wide range of aspect ratios.

Published in:

IEEE Antennas and Propagation Magazine  (Volume:53 ,  Issue: 3 )