Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FA2
Session:
Number:4FA2-1
Reconfigurable beam steering using dipole and loop combined antenna
Sangjun Ha, Yongjin Kim, Chang Won Jung,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Recently, the wireless systems include a large number of techniques that attempt to enhance the received signal, suppress all interfering signals, and increase capacity. Accordingly, these systems have been suggested for communication systems to overcome the problem of limited channel bandwidth, satisfying a growing demand for a large number of mobiles on communications channels [1]. The systems are usually categorized as either switched-beam or adaptive-array systems. The switched-beam approach further subdivides the macro-sectors into several micro-sectors. Typically, the switched-beam system establishes certain choices of beam patterns before deployment, and the method cover wide region. Each micro-sector contains a predetermined fixed beam pattern, with the greatest gain placed in the center of the beam [2]. In this paper, we propose a reconfigurable beam steering antenna using a folded dipole and a loop. The radiation patterns of the two antennas was cancelled or compensated, and head for the specific direction when the dipole and loop antenna are combined at the reasonable ratio. The structure of the antenna is very simple and planar. By changing on/off states of switches, the proposed antenna can steer the beam direction in the x-y plane. Simulation results confirmed the steering characteristic by using two imaginational switches. The proposed antenna can change the direction of the maximum gain in the x-y plane (0°, ±50°). The proposed antenna operates in 2.5GHz ~ 2.56GHz (VSWR < 2). It was showed that peak gain of the antenna is 1.96 ~ 2.48dBi and overall beam width of the reconfigurable antenna covers about 125°.