A compact planar MIMO monopole antenna with reduced mutual coupling for WLAN applications using ELC resonator

This paper presents a novel mutual coupling reduction technique of compact two-element multiple-input multiple-output (MIMO) antenna using Electric-LC (ELC) resonator. The proposed antenna has omnidirectional radiation pattern and the 20 dB isolation bandwidth is 9.8 %, i.e., from 5.31– 5.86 GHz which covers the WLAN frequency range of IEEE 802.11a standard whereas return loss of the proposed antenna is better than 15 dB throughout the entire band. The separation between antenna elements is only 0.14λ0, where λ0 corresponds to free space wavelength at 5.7 GHz. The radiation pattern is negligibly affected and the proposed antenna has 8.5 dB lower mutual coupling than that of the reference antenna due to the ELC resonator. This concept is verified with fabrication and measurement.

[1]  Omar M Ramahi,et al.  Mutual Coupling Reduction Between Microstrip Patch Antennas Using Slotted-Complementary Split-Ring Resonators , 2010, IEEE Antennas and Wireless Propagation Letters.

[2]  Shuai Zhang,et al.  Mutual Coupling Reduction for UWB MIMO Antennas With a Wideband Neutralization Line , 2016, IEEE Antennas and Wireless Propagation Letters.

[3]  Ahmed A. Ibrahim,et al.  Compact and Closely Spaced Metamaterial MIMO Antenna With High Isolation for Wireless Applications , 2013, IEEE Antennas and Wireless Propagation Letters.

[4]  Traianos V. Yioultsis,et al.  Metamaterial-Based Design of Planar Compact MIMO Monopoles , 2013, IEEE Transactions on Antennas and Propagation.

[5]  T. Cui,et al.  Reduction of Mutual Coupling Between Closely Packed Patch Antennas Using Waveguided Metamaterials , 2012, IEEE Antennas and Wireless Propagation Letters.

[6]  Hsin-Lung Su,et al.  Implementation of Broadband Isolator Using Metamaterial-Inspired Resonators and a T-Shaped Branch for MIMO Antennas , 2011, IEEE Transactions on Antennas and Propagation.

[7]  O. Quevedo-Teruel,et al.  Mutual Coupling Reduction in Patch Antenna Arrays by Using a Planar EBG Structure and a Multilayer Dielectric Substrate , 2008, IEEE Transactions on Antennas and Propagation.

[8]  Zhengwei Du,et al.  Reducing Mutual Coupling of MIMO Antennas With Parasitic Elements for Mobile Terminals , 2012, IEEE Transactions on Antennas and Propagation.

[9]  Paolo Burghignoli,et al.  Combinations of low/high permittivity and/or permeability substrates for highly directive planar metamaterial antennas , 2007 .

[10]  Z. Nie,et al.  An Efficient Decoupling Feeding Network for Microstrip Antenna Array , 2015, IEEE Antennas and Wireless Propagation Letters.

[11]  Jordi Romeu Robert,et al.  Exact representation of antenna system diversity performance from input parameter description , 2003 .

[12]  J. R. Mohassel,et al.  Mutual Coupling Reduction for Two Closely Spaced Meander Line Antennas Using Metamaterial Substrate , 2016, IEEE Antennas and Wireless Propagation Letters.

[13]  J. Romeu,et al.  Exact representation of antenna system diversity performance from input parameter description , 2003 .

[14]  David R. Smith,et al.  Electric-field-coupled resonators for negative permittivity metamaterials , 2006 .