Design of a Four Feeding Microstrip Patch Antenna

A four feeding microstrip antenna operating at 2.0 GHz and match to a 50Ω impedance is designed to combine the power externally in wireless communication. The antenna is designed using Agilent’s Advanced Design System (ADS) and Computer Simulation Technology (CST) simulation tools.

After fabricating the antenna, the S-parameter, radiation pattern and the antenna gain was measured. The results between simulation and measurement were then compared. Both of simulation and measurement are in good agreement with the beam over the four different directions measured.

INTRODUCTION

The microstrip antenna is very easy to manufacture and can be produced in great quantity by printed circuit technology. Also, a microstrip antenna can easily integrate the amplifier, mixer and oscillator in a substrate using Microwave Integrated Circuit (MIC) or Monolithic Microwave Integrated Circuit (MMIC) technologies [1]. On the other hand, this antenna posses several disadvantages including narrow bandwidth. Hence, many researchers have been studying these disadvantages with a focus on improving the band performance [2].

Apart from that, most of the conventional microstrip antennas exhibit omni-directional patterns only. However, the multi-beam smart antenna can produce multiple narrow beams in different directions and select the strongest signal among all of the available ones. This kind of system can distinguish the users that stand at different positions, and as a result, expand the capacity [3-4].