Reduction of Mutual Coupling Between Closely-Packed Antenna Elements

Abstract-A MIMO/Diversity antenna with triple notch characteristics is proposed in this article. The proposed antenna has triple notches in the WiMAX band (3.3-3.6 GHz), WLAN band (5-6 GHz), and X-band satellite communication (7.2-8.4 GHz) band. Defected Ground Compact Electromagnetic Band Gap (DG-CEBG) is a design used to accomplish band notches. Defected ground planes are utilised so as to achieve compactness in conventional EBG structures. The proposed WiMAX band, WLAN band, and X-band satellite communication band DG-CEBG structures show a compactness of around 46%, 50%, and 48%, respectively, over a conventional EBG structure. In these structures, decoupling strips and a slotted ground plane are used to enhance the isolation between two closely spaced UWB monopoles. The individual monopoles are 90 • angularly separated with a stepped structure which helps to reduce mutual coupling and also contributes towards impedance matching by increasing the current path length. |S 21 | or mutual coupling is found to be less than 15 dB over the whole UWB frequency range. The Envelope Correlation Coefficient (≤ 0.5) is within the acceptable limits over the whole UWB frequency range. Notched frequency depends on the parameters of DG-CEBG structures; when there is a change in these parameters notch frequency is also changed. A low cost FR-4 substrate with thickness (h) = 1.6 mm, permittivity (ε) = 4.4 and loss tangent (δ) = 0.02 is used for the proposed antenna, and it has a compact size of 58 × 45 × 1.6 mm 3 .

Section: Introductionmentioning

confidence: 99%

Triple Band Notched Dg-Cebg Structure Based Uwb Mimo/Diversity Antenna

Jaglan¹,

Gupta²,

Kanaujia³

et al. 2018

“…This issue has drawn great attention to the academia as well as many world leading companies. The solutions include metamaterial based decoupling [4][5][6][7], passive network based decoupling [8][9][10][11] and parasitic structures or elements decoupling [12,13]. This paper presents the design of a decoupling network formed by inverters and SRRs.…”

Section: Introductionmentioning

confidence: 99%

A Mimo Antenna Decoupling Network Composed of Inverters and Coupled Split Ring Resonators

Zhao¹,

Liu²,

Cai³

2017

Abstract-A decoupling network for a pair of strongly coupled MIMO antennas is presented. The decoupling network is composed of two inverters and two split ring resonators (SRRs) that are also coupled. By properly transforming the mutual admittance of the original coupled antennas and properly designing the coupling between the two SRRs, more than 20 dB isolation between the two antennas can be achieved while their respective matching performances remain good. To validate the concept, a microstrip decoupling network is designed and implemented for a pair of wideband printed monopole antenna elements. Measurement results have demonstrated that nearly 10% bandwidth for 20 dB isolation can be achieved. Measured radiation patterns have demonstrated a significant reduction of the correlation coefficient, which makes the proposed technique a promising candidate for both current and future generations of MIMO-enabled mobile terminals.

“…Electromagnetic band gap (EBG) structures have been used to diminish this coupling [6,7]; however, these structures are complicated and require a large structure. In [8][9][10][11], mutual coupling was reduced using etching slits and slots on the ground plane called a defected ground structure (DGS), but sometimes a large ground plane was required in order to achieve this reduction. Furthermore, DGS systems have disadvantages in practical implementation due to their complicated ground structures.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Technique for a Decoupling Network in a Compact Antenna Array in a Mimo System

Ko¹,

Han²,

Myung³

2014

Abstract-Decoupling networks (DNs) have frequently been used to obtain high isolation performance between coupled antennas in multiple-input multiple-output (MIMO) systems due to their advantage of spatial efficiency, which is particularly important for mobile devices. However, conventional DNs suffer from narrowband limitations. In this paper, a broadband decoupling technique is proposed that broadens the isolation bandwidth using a parallel resonant point. A 1.95 GHz MIMO antenna system with 460 MHz of bandwidth (fractional bandwidth, FBW = 23.6%) is designed and measured using the scattering parameters. The isolation is found to be better than −15 dB, while the reflection coefficient is better than −6 dB. Furthermore, the antenna efficiency and envelope correlation coefficient (ECC) are evaluated in a reverberation chamber.