scholarly journals Metamaterial-Based Highly Isolated MIMO Antenna for Portable Wireless Applications

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 267 ◽  
Author(s):  
Amjad Iqbal ◽  
Omar A Saraereh ◽  
Amal Bouazizi ◽  
Abdul Basir
Keyword(s):  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
High Gain ◽  
Metamaterial Structure ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Capacity Loss ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Edge Separation

In this paper, a metamaterial structure is presented to lower the mutual coupling between the closely spaced microstrip patch antenna elements. Two elements Multiple Input Multiple Output (MIMO) antenna is closely placed with each other at edge to edge separation of 0.135 λ 0 (7 mm). Isolation improvement of 9 dB is achieved by keeping the metamaterial structure in between the MIMO elements. With the proposed structure, the isolation is achieved around −24.5 dB. Due to low ECC, high gain, low channel capacity loss and very low mutual coupling between elements, the proposed antenna is a good candidate for the MIMO applications. The proposed antenna is fabricated and tested. A reasonable agreement between simulated and measured results is observed.

Near Zero Parameter Metamaterial Inspired Superstrate for Isolation Improvement in MIMO Wireless Application

Frequenz ◽  
2020 ◽  
Vol 74 (1-2) ◽  
pp. 17-23
Author(s):  
Robert Mark ◽  
Soma Das
Keyword(s):  
Multiple Input Multiple Output ◽  
High Gain ◽  
Antenna System ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Wireless Application ◽  
Measured Impedance ◽  
Edge Separation

AbstractIn this paper, near zero parameter based metamaterial superstrate is presented for mutual coupling reduction in multiple-input-multiple-output (MIMO) antenna. The proposed design offers a peak isolation of 38 dB with edge-separation of 0.042λ0 at resonating frequency. To verify the simulations results, a prototype of the proposed antenna is fabricated and experimentally measured. The two elements MIMO is designed with measured impedance bandwidth of 5.6 to 5.95 GHz with a peak measured gain of 7.4 dBi and efficiency above 95 %.The measurement established an isolation enhancement of 30 dB with minimum correlation coefficient of 0.05 within operating band. The proposed method offers a good design technique for high gain and closely packed MIMO antenna system for WLAN applications.

Dual circular slot ring triple-band MIMO antenna for 5G applications

Frequenz ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Anand Kumar ◽  
Santosh Kumar Mahto ◽  
Rashmi Sinha ◽  
Arvind Choubey
Keyword(s):  
Mutual Coupling ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Mobile Terminal ◽  
High Gain ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Smart Wearable ◽  
Triple Band

AbstractA Triple-band Multiple-Input-Multiple-Output (MIMO) antenna for 5G mobile terminal applications is proposed in this paper. The design comprises four-port/two resonators, each having two concentric circular slot ring radiators etched on a ground plane of size 50 mm ${\times}$ 50 mm. The antenna is fed by perpendicularly arranged 50 Ω microstrip line feeds on the top layer. Decoupling techniques were used to suppress mutual coupling between the two resonators. The perpendicular arrangement of the feed lines and port reduces mutual coupling between the two ports and increases isolation. The antenna operates in multiple bands: 3.35–3.69 GHz, 24–28 GHz, and 37–40 GHz frequency range with central frequencies at 3.5 GHz, 26 GHz, and 38 GHz, respectively allocated for 5G. The antenna provides a gain of 2.7–7.8 dB and a radiation efficiency of 0.49–0.85 in the operating bands. Diversity performance is studied in terms of the Envelop Correlation Coefficient (ECC), Diversity Gain (DG), and Total Active Reflection Coefficient (TARC) were found to be less than 0.01, greater than 9.99 dB, and less than −10 dB respectively. The proposed antenna offers good S-parameters, voltage standing wave ratio (VSWR), TARC, radiation pattern, high gain, and low ECC. The antenna was fabricated and tested. The measured results and simulated results are in good agreement. It possesses sufficient potential for 5G mobile terminal and smart wearable applications.

Compact MIMO antenna with optimized mutual coupling reduction using DGS

2013 ◽  
Vol 6 (2) ◽  
pp. 173-180 ◽  
Author(s):  
Ahmed A. Ibrahim ◽  
Mahmoud A. Abdalla ◽  
Adel B. Abdel-Rahman ◽  
Hesham F. A. Hamed
Keyword(s):  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Patch Antennas ◽  
Defected Ground Structure ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Multiple Input ◽  
Input Multiple Output

A design of low mutual coupling between two microstrip patch antennas for multi input multi output antenna is presented. The two antenna elements operate at 5.8 GHz for wireless applications. The reduction of mutual coupling between the antenna elements is achieved by using a defected ground structure (DGS). The DGS is inserted between the microstrip patch antenna elements to limit the surface waves between them. The separation between the edges of the two elements has been achieved to be only 0.058λ0. The analysis of the correlation coefficient, diversity gain and total active reflection coefficient is presented to validate the performance of the multiple-input–multiple-output (MIMO) antenna. The isolation of the proposed MIMO antenna is 28 dB at 5.8 GHz and the envelope correlation equals 0.003. Owing to these good performances each antenna can operate almost independently. A good agreement is achieved between the simulated and the measured results.

scholarly journals Design of Miniaturized and Enhanced Gain Antipodal Vivaldi Antenna for 5G Applications

2020 ◽  
Vol 9 (3) ◽  
pp. 1098-1101
Keyword(s):  
Frequency Band ◽  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
High Gain ◽  
Mimo Antenna ◽  
Antenna Parameter ◽  
Project Method ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Vivaldi Antenna

In this project, method of designing of high gain and mutual coupling reduction is proposed, which can be done by antipodal Vivaldi antenna (AVA) for 5G applications. For the reduction of isolation between the antenna elements, the antennas are not placed adjacent to each other because they have a chance of absorbing the energy which is to be transmitted. The proposed AVA comprises of 2 x 1 multiple input multiple output (MIMO) antenna elements. The antenna parameter enhancement techniques used in this design are corrugation and circular slots. The antenna dimensions are 50mm x 48mm x 0.8mm. Here, we use corrugation and circular slots method, as to increase the gain than previously designed antenna. The maximum isolation of antenna is achieved is 37dB and gain is improved in the desired range. The simulated gain is in the range of 7.1-14.4 dB in the frequency band of 20-30GHz.

scholarly journals Mutual Coupling Reduction of DRA for MIMO Applications

2019 ◽  
Vol 8 (1) ◽  
pp. 75-81
Author(s):  
N. Al Shalaby ◽  
S. G. El-Sherbiny
Keyword(s):  
Mutual Coupling ◽  
Dielectric Material ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Parasitic Element ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Element Method

In this paper, A multiple input Multiple Output (MIMO) antenna using two Square Dielectric Resonators (SDRs) is introduced. The mutual coupling between the two SDRAs is reduced using two different methods; the first method is based on splitting a spiral slot in the ground plane, then filling the slot with dielectric material, "E.=2.2". The second method is based on inserting a copper parasitic element, having the same shape of the splitted Spiral, between the two SDRAs.  The effect of replacing the copper parasitic element with Carbon nanotubes (CNTs) parasitic element "SOC12 doped long-MWCNT BP" is also studied. The antenna system is designed to operate at 6 GHz. The analysis and simulations are carried out using finite element method (FEM). The defected ground plane method gives a maximum isolation of l8dB at element spacing of 30mm (0.6λo), whereas the parasitic element method gives a maximum isolation of 42.5dB at the same element spacing.

scholarly journals Minimization of Mutual Coupling Using Neutralization Line Technique for 2.4 GHz Wireless Applications

2015 ◽  
Vol 6 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Wan Noor Najwa Wan Marzudi ◽  
Zuhairiah Zainal Abidin ◽  
Siti Zarina Mohd Muji ◽  
Yue Ma ◽  
Raed A. Abd-Alhameed
Keyword(s):  
Reflection Coefficient ◽  
Mutual Coupling ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Wireless Applications ◽  
Input Multiple Output ◽  
Neutralization Line

This paper presented a planar printed multiple-input-multiple-output (MIMO) antenna with a dimension of 100 x 45 mm2. It composed of two crescent shaped radiators placed symmetrically with respect to the ground plane. Neutralization line applied to suppress mutual coupling. The proposed antenna examined both theoretically and experimentally, which achieves an impedance bandwidth of 18.67% (over 2.04-2.46 GHz) with a reflection coefficient < -10 dB and mutual coupling minimization of < -20 dB. An evaluation of MIMO antennas is presented, with analysis of correlation coefficient, total active reflection coefficient (TARC), capacity loss and channel capacity. These characteristics indicate that the proposed antenna suitable for some wireless applications.

Design of a wearable MIMO antenna deployed with an inverted U-shaped ground stub for diversity performance enhancement

2020 ◽  
pp. 1-11
Author(s):  
Anupma Gupta ◽  
Ankush Kansal ◽  
Paras Chawla
Keyword(s):  
Performance Enhancement ◽  
Multiple Input Multiple Output ◽  
The Body ◽  
Structural Deformation ◽  
Mimo Antenna ◽  
Tissue Phantom ◽  
Capacity Loss ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Broadside Radiation

Abstract A compact multiple input multiple output (MIMO) antenna operating at 2.45 GHz industrial scientific and medical band is presented for wearable devices. Open-end slotting is used to miniaturize the antenna dimensions. Inverted U-shaped ground stub is incorporated to reduce mutual coupling. On-body performance is analyzed on a three-layered equivalent tissue phantom model. The wide bandwidth of 300 MHz and port isolation of 30 dB are obtained from measured results. The antenna shows the efficiency of 40% and directivity of 4.56 dBi when placed at a gap of “s” = 4 mm from the body. Broadside radiation pattern and low specific absorption rate make the antenna suitable for on-body communication. Further, diversity performance is measured in terms of envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL). The value of ECC is 0.025, DG is 9.98 dB, and CCL is 0.12 bits/s/Hz at 2.45 GHz. Antenna robustness is examined by bending the structure at different radii along the x-axis and y-axis. Performance of the proposed structure is reliable with structural deformation.

UWB MIMO antenna with common radiator

2016 ◽  
Vol 9 (3) ◽  
pp. 573-580 ◽  
Author(s):  
Garima Srivastava ◽  
B. K. Kanuijia ◽  
Rajeev Paulus
Keyword(s):  
Low Cost ◽  
Multiple Input Multiple Output ◽  
Impedance Bandwidth ◽  
Rectangular Slot ◽  
Mimo Antenna ◽  
Circular Patch ◽  
Capacity Loss ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output

A compact printed 2 × 2 ultrawideband (UWB) multiple input multiple output (MIMO) antenna with a single circular patch as a common radiator for both the antenna elements is presented in this paper. A single circular patch is excited by two tapered CPW feeds for dual polarization. To improve the isolation between two ports, a rectangular slot of dimension L1 × W1 is created in the radiator. The UWB MIMO antenna has impedance bandwidth of 3–12 GHz with a isolation better than 17 dB between the two ports. The envelope correlation coefficient and the capacity loss are evaluated to ensure the good diversity performance of UWB MIMO antenna. The antenna has a compact size of 45 × 45 mm2 and is fabricated on low cost FR4 substrate and measured using Agilent VNA. The simulated and measured results show that the proposed UWB antenna is good candidate for UWB MIMO applications.

A Superwideband Monopole Multiple-Input-Multiple-Output (MIMO) Antenna with Dual Notched (Inverted T-Shaped Stub/U-Shaped Slit) Band Characteristics for Wireless Applications

2019 ◽  
Vol 16 (10) ◽  
pp. 4242-4248
Author(s):  
Manoj Kapil ◽  
Manish Sharma
Keyword(s):  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Research Article ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Microstrip Feed

In this research article, a compact MIMO (Multiple-Input-Multiple-Output) antenna with inclusion of two notched bands characteristics is presented. Designed MIMO antenna consist of dual radiating patches printed on one surface of the substrate which covers measured wide impedance bandwidth of 2.88 GHz–19.98 GHz and satisfies bandwidth ratio more than 10:1 for superwideband with compact size of 18 mm × 34 mm. Two radiating patch are placed symmetrically for MIMO configuration and notched bands to eliminate WiMAX/C and WLAN bands are obtained by attaching inverted T-shaped stub on radiating patch and etched inverted U-shape slit in microstrip feed. Isolation between the two radiating patch is maintained by adding two L-shaped stub in slotted rectangular ground plane. Measured radiation pattern are stable in operating band and offers maximum 4.23 dBi and 89% gain and radiation efficiency respectively. Moreover, antenna shows good diversity performance with Envelope-Correlation-Coefficient (ECC) < 0.5, Directive-Gain (DG) > 9.95 dB and Total-Active-Reflection Coefficient (TARC) < -30 dB.

scholarly journals Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Chia-Hao Wu ◽  
Jwo-Shiun Sun ◽  
Bo-Shiun Lu
Keyword(s):  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Three Dimensional ◽  
Antenna Design ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Plastic Materials ◽  
Monopole Antennas ◽  
Multiple Input ◽  
Input Multiple Output

This paper presents a compact four-element multiple-input–multiple-output (MIMO) antenna design operating within the WiFi 802.11 ac bands (5.2–5.84 GHz) for a smartwatch. The antenna is fabricated using a polyamide substrate and embedded into the strap of a smartwatch model; the strap is created using three-dimensional etching of plastic materials. The four-element MIMO antenna is formed by four monopole antennas, has a simple structure, and is connected to the system ground plane of the smartwatch. Due to the stub and notched block between two antennas and the slit in the system ground, the four-element MIMO antenna exhibits favorable isolation. Moreover, the envelope correlation coefficient of the antennas is considerably lower than 0.005 in the operating band. The measured −6 dB impedance bandwidths of the four elements of the antenna (Ant1–Ant4) with the human wrist encompass the WiFi 802.11 ac range of 5.2–5.84 GHz; moreover, an isolation of more than 20 dB is achieved. The measured antenna efficiency with and without a phantom hand are 45%–55% and 93%–97%, respectively.

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