Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FC1
Session:
Number:4FC1-3
Design of a 2.3 GHz Band Mobile-WiMAX MIMO Antenna using Split Ring Resonator
Uisheon Kim, Youngki Lee, Soonyong Lee, Jaehoon Choi,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent mobile communication systems, high data rates and large channel capacities are required to satisfy the various user’s demands. The multiple input multiple output (MIMO) system is a space-time signal processing approach in which the time dimension is complemented by the spatial dimension through the use of spatially distributed multiple antennas. The MIMO system can increase the capacity or reliability of a communication channel without requiring additional power or spectrum, unlike other systems [1]. In the MIMO system, two or more antennas are used on both the transmitter and receiver sides. However, the antenna elements are strongly coupled with each other and even with the ground plane because they share a surface current [2]. Many studies have been performed to improve the isolation characteristic of a MIMO antenna using a shorting strip [3], a new ground structure with slits to act as a band-stop filter [4] and a corrugated ground plane [5]. However, these techniques limit the space available for other system components as well as do not guarantee an uniform radiation pattern. Metamaterials can be defined as man-made homogeneous electromagnetic structures with unusual properties not readily available in nature. Microwaves cannot propagate in a medium with a negative electrical property (ε < 0 or μ < 0). Negative permeability materials can usually be obtained using the SRR structure at a specific frequency band. The resonance frequency is determined by the capacitance and inductance of its structure [6]. In this study, the Split Ring Resonator (SRR) structure is inserted between the two radiating elements to improve the isolation characteristic between two radiating elements for Mobile-WiMAX band (2.3 ~ 2.4 GHz). Details of the antenna design and experimental results are presented and discussed.