Content area

Full text

Abstract

This work presents performance of groundplane shaping and its effect in four element dualband multiple input multiple output (MIMO) antenna. This proposed four element dualband MIMO antenna consists of four bowtie dipole antenna which operates at 1800 MHz (low frequency) and 2300 MHz (high frequency). This proposed four element dualband MIMO antenna occupies a 270 x 210 x 100 mm3 of FR 4 substrate. We use four types of groundplane pattern i.e. full groundplane, cornered spatial groundplane, crossed middle groundplane, and spiral groundplane. These various grounplane patterns influence the performance of main parameters of dualband MIMO antenna. Cornered spatial groundplane pattern yields a largest bandwidth (VSWR < 2) 282 MHz or 15.24% of center frequency at low frequency. Full groundplane pattern creates 135.2 MHz at high frequency. In addition, cornered spatial groundplane pattern also generates a lowest VSWR that is valued 1.21 at both low frequency and high frequency. The 5 parameters, basically both cornered spatial and full groundplane pattern produce a better return loss than two others. All four groundplane patterns deliver equally a mutual coupling parameter.The last, this proposed four element dualband MIMO with various groundplane patterns gives a good farfield properties i.e. gain, radiation pattern, H-E field.

Keywords: groundplane, MIMO antenna, dualband, mutual coupling, S parameter, bandwidth

Copyright © 2017 Universitas Ahmad Dahlan. All rights reserved.

(ProQuest: ... denotes formulae omitted.)

1.Introduction

In recent years, telecommunication technology is moving toward into high speed data rate communication. Particularly, cellular telecommunication now is 4th generation which is 300 Mps uplink dan 75 Mbps downlink data rate. Many techniques have been developed on digital communication that addressed to support high speed data rate. One of important technique is antenna system. The antenna system has been deeply developed. Recently, receiver and transmitter use multiple antennas, it is well known as multiple input multiple output (MIMO) antenna system. The MIMO antenna system has an advantage in term of spatial multiplexing and spatial diversity. Spatial diversity provides stronger link robustness by increased signal to noise ratio. Spatial multiplexing effectively increases a link capacity [1]. A wider bandwidth is absolutely needed in recent celluler telecommunication technology. Various techniques were explored to enhance the bandwidth, such as using feed optimization, ground plane slits and shaping [2], bevels, different thickness...

Show less