Table of Contents
International Journal of Microwave Science and Technology
Volume 2014 (2014), Article ID 675891, 10 pages
http://dx.doi.org/10.1155/2014/675891
Research Article

Multifrequency Oscillator-Type Active Printed Antenna Using Chaotic Colpitts Oscillator

Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi 835215, India

Received 26 August 2014; Revised 3 November 2014; Accepted 10 November 2014; Published 30 November 2014

Academic Editor: Chien-Jen Wang

Copyright © 2014 Bibha Kumari and Nisha Gupta. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a new concept to realize a multifrequency Oscillator-type active printed monopole antenna. The concept of period doubling route to chaos is exploited to generate the multiple frequencies. The chaotic Colpitts oscillator is integrated with the printed monopole antenna (PMA) on the same side of the substrate to realize an Oscillator-type active antenna where the PMA acts as a load and radiator to the chaotic oscillator. By changing the bias voltage of the oscillator, the antenna can be made to operate at single or multiple frequencies. To test the characteristics of the antenna at single and multiple frequencies of operation, two similar prototype models of printed monopole broadband antennas are developed. One of these antennas used at transmit side is fed by the chaotic Colpitts oscillator while the other is used as the receive antenna. It is observed that the antenna receives single or multiple frequencies simultaneously for particular values of the bias voltage of the oscillator at the transmit end.