By Topic

A monopole loaded with a loop 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
$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

1 Author(s)
E. E. Altshuler ; Rome Lab., US Air Force, Hanscom AFB, MA, USA

A traveling-wave distribution of current can be produced on a monopole over a ground plane by inserting a resistance of suitable magnitude one-quarter wavelength from its end. It has been shown that the resistor can be replaced with a modified folded dipole which has a radiation resistance approximately equal to that of the resistor. In this paper, the resistor is replaced with a loop antenna. The main objective is to obtain an antenna having hemispherical coverage and is circularly polarized. Input impedance, current distribution, and radiation patterns of this antenna are computed using the numerical electromagnetics code (NEC); radiation patterns are also measured. Monopoles which are loaded with both series and parallel-fed circular and square loops are investigated. It was shown that circular polarization could be obtained over most of the hemisphere with both types of series-fed loops. The parallelized loop insertions produced more directional circularly polarized patterns. Most computations and measurements were made at a frequency of 1.6 GHz. The frequency dependence was examined and it was found that these antennas can operate over the band from 1.4-2.0 GHz. These very simple, low-cost antennas have potential application for systems such as IRIDIUM and Global Positioning System

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:44 ,  Issue: 6 )