Mutual Coupling Reduction of Two 2x1 Triangular-Patch Antenna Array Using a Single Neutralization Line for MIMO Applications

Abstract

In this paper, a novel structure of two interlaced antenna arrays for MIMO applications is presented. It consists of two 2  1 triangular patch array antennas, which have all elements separated by a short distance among them (0.22λ 0), where mutual coupling can be very poor (S 21 =-7.81 dB). To overcome such weakness, a simple and efficient method is used: one neutralization line (NL) is introduced to increase the decoupling between both ports, reaching up to-29 dB at the central frequency, and below-20 dB over a large bandwidth. The whole MIMO antenna array has dimensions of 1.56λ 0 × 0.3λ 0 and has a gain of 9.11 dBi. Its diversity parameters describe it as a useful radiator for MIMO communications systems.

The correct application of total active reflection coefficient to evaluate MIMO antenna systems and its generalization to N ports

“…In Reference , the possibility of interlacing two 2 × 1 antenna arrays for a MIMO application was explored. Since the patch antennas were too close to each other (0.22λ 0 ), the worst value of S 21 parameter magnitude, −7.81 dB, is considered high compared to results found in current literature.…”

“…Behavior of the absolute value of cosine arguments of Equation for (A) θ = +45° and (B) θ = −45°, applied to the scattering matrix from Reference …”

“…However, several authors have issued on leading journals on Antennas and Microwave Techniques imprecise equations to compute TARC on MIMO antennas, which disregard the information of random phases, and its impact on the performance of the antenna system vs frequency. After an examination of the state‐of‐the‐art on MIMO arrays performed by the authors of this work, it was found that many papers reported a correct evaluation of TARC expression by displaying a family of curves, given by the variations on the random phases θ i , along with the computation of other adequate antenna metrics. Whereas in several other papers a wrong version of the equation was used; or only one curve was displayed without a mathematical explanation of how it was derived; only one value at the resonance frequencies was reported in a table; and, finally, one curve obtained by averaging an unknown number of TARC curves was given .…”

A Novel Compact Highly Isolated UWB MIMO Antenna with WLAN Notch

“…Various techniques have been used for isolation enhancement such as Defected Ground Structure (DGS) [2,3], Electromagnetic band gap (EBG) [4][5][6][7], Parasitic Element [8][9][10][11], complementary split ring resonators [12][13][14], metallic stubs and shorting pins [15][16][17][18], and neutralization line [19,20]. For instance, in [2], S-Shape periodic defected ground structure (PDGS) is used for coupling reduction.…”

Quad-Port MIMO Filtenna With High Isolation Employing BPF With High Out-of-Band Rejection

“…Polarization orthogonal elements [11], Electromagnetic band-gap (EBG) structure [12], Meanderline EBG [13], neutralization line [14,15], stubs [16,17,18], parasitic elements [19,20], shorting pin [21], metamaterials with neutralization lines [22], [23], slots or carbon black film [24] have been presented in the literature. In [11], a MIMO system with two antenna elements that achieve orthogonal polarization with dimensions of 27 × 21 mm2 and an isolation level of 22.5 dB has been presented.…”