By Topic

Two-arm eccentric spiral antenna

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
$31 $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)
Gloutak, R.T., Jr. ; Northrop Corp., Pico Rivera, CA, USA ; Alexopoulous, N.G.

This paper presents a free-space analysis of a planar two-arm eccentric spiral antenna. The eccentricity generates a circularly polarized wave with the main beam directed off-normal to the spiral plane. Input impedance and radiation characteristics are calculated from the current distribution generated by a method of moments solution. The radiation characteristics include power gain and axial ratio patterns. Three-dimensional (3-D) gain surface plots illustrate off-normal dependence of the eccentricity constant. The eccentric spiral antenna is found to have a significant increase in gain. This occurs when adjacent spiral arms rotating 360° have an electrical length increase of one wavelength. Thus, adjacent currents on one side of the spiral are nearly all in-phase. On the opposite side of the spiral, all neighboring currents are nearly out-of-phase. Evaluation of these currents result in a theory of operation for eccentric spiral antennas

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:45 ,  Issue: 4 )