scholarly journals Tri-band MIMO Antenna for WLAN, WiMAX and Defence System & Radio Astronomy Applications

2018 ◽  
Vol 7 (2) ◽  
pp. 60-67 ◽  
Author(s):  
K. B. V. Babu ◽  
B. Anuradha
Keyword(s):  
Radio Astronomy ◽  
Wireless Lan ◽  
Mutual Coupling ◽  
Ground Plane ◽  
Portable Device ◽  
Resonant Frequencies ◽  
Mimo Antenna ◽  
Defence System ◽  
Device Applications ◽  
Simulation Results

In this paper, an efficacious and impermeable undeviating MIMO consist of 70 x 50 x 0.4 mm3 is used for WLAN, defence system & radio astronomy and WiMAX applications. To keep in order abandoning the reactive connection between the antennas, a neutralizing line is connected between the two symmetrical radiating elements. Another technique to reducing isolation (mutual coupling) between the antennas, four small slits of small size are etched onto to the ground plane. This has resulted in the proposed antenna giving a good bandwidth at the three resonant frequencies of (3.2–3.7 GHz) for Wireless LAN, (5.1–5.6 GHz) WiMAX and (6.7–7.5 GHz) defence system & radio astronomy applications with |S11|< -10 dB and mutual coupling |S12|< -20 dB for the entire operating band. The simulation results and measured results demonstrate that tri-band MIMO antenna is more acceptable for the design in portable device applications.

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 compact MIMO antenna system with reduced mutual coupling

2014 ◽  
Vol 8 (1) ◽  
pp. 117-124 ◽  
Author(s):  
Mohammed Younus Talha ◽  
Kamili Jagadeesh Babu ◽  
Rabah W. Aldhaheri
Keyword(s):  
Resonant Frequency ◽  
Mutual Coupling ◽  
Mimo System ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Operating Band

A novel compact multiple-input–multiple-output (MIMO) antenna system operating from 5 to 7.3 GHz is proposed for wireless applications. It comprises of two similar antennas with microstrip feeding and radiating patches developed on a reduced ground plane. The developed antenna system resonates at a dual-band of 5.4 and 6.8 GHz frequencies, giving an impedance bandwidth of 38% (based on S11 < −10 dB). The unique structure of the proposed MIMO system gives a reduced mutual coupling of −27 dB at 5.4 GHz resonant frequency and −19 dB at 6.8 GHz resonant frequency and in the entire operating band the coupling is maintained well below −16 dB. The envelope correlation coefficient of the proposed MIMO system is calculated and is found to be less than 0.05 in the operating band. The measured and simulation results are found in good agreement.

scholarly journals DUAL-BAND RECONFIGURABLE MIMO ANTENNA FOR WIRELESS APPLICATIONS

2021 ◽  
Vol 25 (3) ◽  
pp. 1-9
Author(s):  
Abdullah A. Jabber ◽  
◽  
Raad H. Thaher ◽  
Keyword(s):  
Coupling Effect ◽  
Mimo System ◽  
Dual Band ◽  
Reconfigurable Antenna ◽  
Pin Diode ◽  
Wireless Devices ◽  
Resonant Frequencies ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Simulation Results

This article presents design and simulation of a new compact four-element dual-band MIMO frequency reconfigurable antenna that can be reconfigured for WiMAX and LTE applications. The antenna includes four elements at the same FR4 substrate with an optimized overall size of 65x65x1.6 mm3 and an optimized partial GND plane of 30x11.125 mm2. The reconfiguration rate is between 2.41 and 3.99 GHz that can cover the WiMAX and LTE wireless devices by applying just one RF (PIN) switch to change the operating frequency. The antenna operates on the two states of the PIN diode under its two states ON and OFF with (2.7 GHz, and 2.8 GHz) resonant frequencies respectively. The proposed antenna produces acceptable simulation results for the MIMO system by achieving gain from (3-7.2) dBi, less than -14.5 dB coupling effect, less than 0.28 envelope correlation coefficient, and diversity gain range from 8.4-10.

scholarly journals Mutual Coupling Reduction Using a Protruded Ground Branch Structure in a Compact UWB Owl-Shaped MIMO Antenna

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
A. Mchbal ◽  
N. Amar Touhami ◽  
H. Elftouh ◽  
A. Dkiouak
Keyword(s):  
Mutual Coupling ◽  
Impedance Matching ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Input Multiple Output ◽  
Uwb Applications

A compact ultra-wideband (UWB) multiple input-multiple output (MIMO) antenna with high isolation is designed for UWB applications. The proposed MIMO antenna consists of two identical monopole antenna elements. To enhance the impedance matching, three slots are formed on the ground plane. The arc structure as well as the semicircle with an open-end slot is employed on the radiating elements the fact which helps to extend the impedance bandwidth of the monopole antenna from 3.1 up to 10.6 GHz, which corresponds to the UWB band. A ground branch decoupling structure is introduced between the two elements to reduce the mutual coupling. Simulation and measurement results show a bandwidth range from 3.1 to 11.12 GHz with |S11_|<−15 dB, |S21_|<−20 dB, and ECC < 0.002.

scholarly journals MUTUAL COUPLING EFFECT ON MIMO ANTENNA

2014 ◽  
pp. 247-250
Author(s):  
BHUSHAN R. KALAMKAR ◽  
SACHIN S. KHADE ◽  
B.L. BADJATE
Keyword(s):  
Antenna Array ◽  
Mutual Coupling ◽  
Mimo Systems ◽  
Coupling Effect ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Correlation Coefficients ◽  
Mimo Antenna ◽  
Input Multiple Output ◽  
Plate Antenna

To reduce mutual coupling effect on MIMO Antenna this paper presents the analysis of bent ground plane antennas for multiple-input-multiple-output (MIMO). First, the three plate antenna array patterns of the envelope correlation coefficients are proposed to evaluate the diversity performance of antennas in MIMO systems. Following this, a compact three-element suspended plate antenna array with a bent ground plane is presented. The diversity performance of the design is experimentally and numerically analysed.

Compact Dualband Mimo Antenna for Wireless Communication

2021 ◽  
Author(s):  
Vijetha Tummala ◽  
D Ramakrishna ◽  
R Karthik
Keyword(s):  
Mutual Coupling ◽  
Ground Plane ◽  
Circular Ring ◽  
Antenna System ◽  
Dual Band ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Multiple Input ◽  
Constant E ◽  
Communications System

Abstract A compact dual band two element planar multiple input and multiple output (MIMO) antenna system is designed for Wireless applications. The Proposed design consists of two printed F shape slot radiators which are arranged symmetrically on the upper layer of the substrate. A patch with I shaped strip on the ground plane helps in reducing the mutual coupling between radiators and A circular ring slot is placed in ground plane to improve the bandwidth of antenna. The proposed module is designed on Fr-4 substrate whose dielectric constant (ɛr) is 4.4. The results show that the MIMO antenna has a resonance frequency at 2.2GHz, which is suitable for Wireless communications system applications and comes with a mutual coupling(s12) less than − 15 dB and the envelop correlation coefficient (ECC) did not exceed 0.02 in the entire operating band of the MIMO antenna part.

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.

scholarly journals Reduction of Mutual Coupling in UWB/MIMO Antenna Using Stub Loading Technique

2021 ◽  
Vol 17 (1) ◽  
pp. 12-18
Author(s):  
Adamu Halilu Jabire ◽  
Anas Abdu ◽  
Sani Saminu ◽  
Sani Salisu ◽  
Abubakar Muhammad Sadiq ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Impedance Matching ◽  
Ground Plane ◽  
Surface Current ◽  
Uwb Antenna ◽  
Mimo Antenna ◽  
Capacity Loss ◽  
Measurement Results ◽  
Uwb Applications ◽  
Mutual Coupling Reduction

Abstract The research presents mutual coupling reduction between UWB-MIMO antenna elements using stub loading technique. The proposed 2 × 2 UWB antenna geometry consists of two circular-shaped monopole radiators with a partial ground for perfect impedance matching. Stubs of 20 mm × 0.2 mm are inserted between the two antenna elements in the ground plane to improve the isolation. The decoupling stub leads to a mutual coupling reduction of less than 20 dB. The farfield measurement at a selected frequency of 10 GHz confirms an omnidirectional radiation pattern. Different MIMO antenna metric such as channel capacity loss (CCL), mean effective gain (MEG), total active reflection coefficient (TARC), envelope correlation coefficient (ECC), and surface current are presented. Details of the design considerations and the simulation and measurement results are presented and discussed. The proposed MIMO antenna array can be well suited for UWB applications.

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