Reconfigurable antenna system with a movable ground plane for cognitive radio

Abstract

A new cognitive radio antenna system is presented and discussed in this study. The antenna system is composed of a wideband antenna that is used for channel sensing and a communicating antenna that is used for dynamic transmission over various frequencies. The communicating antenna is a software controlled reconfigurable antenna that can tune its frequency response by changing the height and angular position of its ground plane. This antenna is composed of a rectangular patch and three ground planes. Two ground planes are fixed while the third one moves and tilts based on the user's demand. The antenna's moving ground plane is controlled by an Arduino board and two linear actuators. The wideband sensing antenna is composed of a printed monopole patch that searches the spectrum for idle frequencies. A prototype of the complete antenna system is fabricated and tested. Both experimental and simulated results show good agreement.