Isolation enhancement of metamaterial structure MIMO antenna for WiMAX/WLAN/ITU band applications

2022 ◽  
pp. 1-11
Author(s):  
Pasumarthi Suneetha ◽  
Kethavathu Srinivasa Naik ◽  
Pachiyannan Muthusamy
Keyword(s):  
Correlation Coefficient ◽  
Mutual Coupling ◽  
Unit Cell ◽  
Antenna Design ◽  
Network Analyzer ◽  
Metamaterial Structure ◽  
Ground Structure ◽  
Mimo Antenna ◽  
Better Than ◽  
Directive Gain

Abstract The μ-negative metamaterial (MNG) two-element MIMO antenna design was proposed in this article for WiMAX (2.5–2.8 GHz), WLAN (3.2–5.9 GHz), and ITU band (8.15−8.25 GHz) applications. The first design of the MIMO antenna operates at 2.7 and 4.9 GHz frequencies. In order to reduce the mutual coupling, a defective ground structure is used. For further isolation improvement, an MNG unit cell is placed in between the two radiating elements at a distance of 10 mm. The designed antenna elements have better than −23 dB coupling isolation between the two radiating elements. Moreover, with MNG an additional frequency of 8.2 GHz is obtained, which is useful for ITU band applications. The proposed antenna bandwidth is expanded by 19% in the lower operational band, 20% in the second operational band, and 32% in the higher frequency band with the MNG unit cell. From the analysis, the proposed antenna is suitable for WiMAX/WLAN/ITU band applications because of its low enveloped correlation coefficient, and highest directive gain and low mutual coupling between the radiating components. The proposed antenna was simulated, fabricated, and measured with the help of the Schwarz ZVL vector network analyzer and anechoic chamber. Both measured and simulated results are highly accurate and highly recommended for WiMAX/WLAN/ITU bands.

scholarly journals Efficient Isolation of an MIMO Antenna Using Defected Ground Structure

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1265
Author(s):  
Haoran Xing ◽  
Xinyan Wang ◽  
Zhenbin Gao ◽  
Xing An ◽  
Hong-xing Zheng ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Internet Of Things ◽  
Mutual Coupling ◽  
Narrow Band ◽  
Scattering Matrix ◽  
Diversity Gain ◽  
Antenna Element ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Mimo Antenna

To implement efficient isolation between units of a multi-input multi-output (MIMO) antenna, a defected ground structure (DGS) has been investigated. An antenna with two elements operating at 5.8 GHz and fed by coaxial is considered. To reduce mutual coupling between the elements, a zigzag groove is inserted into the center of two elements formed as a DGS. To verify this design, a scattering matrix was tested, such as reflection coefficient S11 and transmission coefficient S21 between two element ports. Meanwhile, radiation pattern, current distribution, envelope correlation coefficient (ECC), and diversity gain of the antenna were simulated and measured. The results showed that the mutual coupling was reduced by 28.8 dB when a DGS was used, and the ECC was less than 0.02. Owing to these good performances, each antenna element can operate almost independently, and this MIMO antenna can be efficiently applied to the narrow band Internet of Things system.

Compact UWB–MIMO antenna with quad-band-notched characteristic

2016 ◽  
Vol 9 (5) ◽  
pp. 1147-1153 ◽  
Author(s):  
Ling Wu ◽  
Yingqing Xia
Keyword(s):  
Correlation Coefficient ◽  
Radiation Pattern ◽  
Mimo System ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Mimo Antenna ◽  
X Band ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Better Than

With quad-band-notched characteristic, a compact ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is introduced in the paper. The UWB–MIMO system has two similar monopole elements and occupies 30 × 45 mm2. By inserting two L-shaped slots, CSRR and C-shaped stubs, four notched bands are achieved (3.25–3.9, 5.11–5.35, 5.5–6.06, and 7.18–7.88 GHz) to filter WiMAX, lower WLAN, upper WLAN, and X-band. Meanwhile, the isolation is obviously enhanced with three metal strips on the ground plane. Results indicate that the antenna covers UWB frequency band of 3.1 – 10.6 GHz except four rejected bands, isolation of better than −18 dB, envelope correlation coefficient of <0.02, and good radiation pattern, thus making it useful for UWB systems.

scholarly journals Compact Wideband MIMO Diversity Antenna for Mobile Applications Using Multi-Layered Structure

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1307
Author(s):  
Omer Arabi ◽  
Chan Hwang See ◽  
Atta Ullah ◽  
Nazar Ali ◽  
Bo Liu ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Dielectric Constants ◽  
Impedance Bandwidth ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Diversity Antenna ◽  
Better Than ◽  
Envelope Correlation

A closely packed wideband multiple-input multiple-output (MIMO)/diversity antenna (of two ports) with a small size of less than 18.5 mm by 18.5 mm is proposed for mobile communication applications. The antenna can be orthogonally configured for corner installation or by placing it on a back-to-back structure for compact modules. To enhance the isolation and widen the bandwidth, the antenna is structured with multiple layers having differing dielectric constants. The feeding through a via significantly reduces the ground waves. A multi-fidelity surrogate model-assisted design exploration method is employed to obtain the optimized antenna geometric parameters efficiently. The antenna design was investigated using electromagnetic simulation and a physical realization of the optimal design was then created and subjected to a range of tests. The specific parameters investigated included reflection coefficients, mutual coupling between the input ports, radiation patterns, efficiency and parameters specific to MIMO behavior: envelope correlation coefficient and pattern diversity multiplexing coefficient. It was found that the antenna has an impedance bandwidth of approximately 4 GHz, mutual coupling between input ports of better than −18 dB and an envelope correlation coefficient of less than 0.002 across the operating band. This makes it a good candidate design for many mobile MIMO applications.

scholarly journals Design of Wearable MIMO Antenna Using STUB Matching

2020 ◽  
pp. 373-377
Keyword(s):  
Patch Antenna ◽  
Mutual Coupling ◽  
Microstrip Patch Antenna ◽  
Wearable Electronics ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Mimo Antenna ◽  
Microstrip Patch ◽  
Smart Textile ◽  
Matching Technique

In this work, a Multi-band wearable microstrip patch antenna designed integrated with the defected ground structure(DGS)[1], and the substrate being used is Denim which is flexible[4] and can be easily fabricated on common wearable materials. This Radiating patch antenna is designed with the optimized dimensions and suits appropriately for the communication in wearable electronics as well as in smart textile application. The designed antenna operates at resonating frequencies of 4.885 GHz and 5.57 GHz. Further the design is modified to a 2-element MIMO [2] antenna using T-shaped Stub matching technique to reduce mutual coupling and resonate at frequency of 8GHz by designing and simulating in CST Microwave Studio 2019 software and the enhanced results like Directivity, Gain, E-field are obtained.

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.

scholarly journals Design of a Novel Triple Band Monopole Antenna for WLAN/WiMAX MIMO Applications in the Laptop Computer

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Jayshri Kulkarni ◽  
Raju Seenivasan ◽  
V. Abhaikumar ◽  
Deepak Ram Prasath Subburaj
Keyword(s):  
Antenna Array ◽  
Correlation Coefficient ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Laptop Computer ◽  
Multiple Input ◽  
Medium Band ◽  
Better Than ◽  
Triple Band

This paper presents a triple band monopole antenna design with an overall size of 21  ×  8  mm2 for WLAN/WiMAX Multiple Input and Multiple Output (MIMO) applications in the laptop computer. It comprises of three monopole radiating elements, along with two rectangular open-ended tuning stubs. This structure excites 2.4/5.2/5.8 GHz WLAN and 2.3/3.3/5.5 GHz WiMAX bands. The prototype testing of proposed antenna array formed by using the same antenna design shows that, it has measured -10dB impedance bandwidth of 11.86% (2.22-2.50 GHz) in a lower band (fl), 5% (3.25-3.42 GHz) in medium band (fm) and 16.84% (5.00-5.92 GHz) in upper band (fu). The measured gain and radiation efficiency are well above 3.65 dBi and 75%, respectively, throughout the operating bands. Also, the measured isolation between two antennas is better than -20dB and envelope correlation coefficient (ECC) is less than 0.004 across the three bands of interest. This confirms the applicability of the proposed antenna array for MIMO applications in the laptop computer.

scholarly journals Characteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure

2019 ◽  
Vol 14 (2) ◽  
pp. 215-226 ◽  
Author(s):  
Erik Fritz‐Andrade ◽  
Angel Perez‐Miguel ◽  
Ricardo Gomez‐Villanueva ◽  
Hildeberto Jardon‐Aguilar
Keyword(s):  
Mutual Coupling ◽  
Mode Analysis ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Characteristic Mode ◽  
Mimo Antenna

scholarly journals Design of Compact 4 × 4 UWB-MIMO Antenna with WLAN Band Rejection

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Nguyen Khac Kiem ◽  
Huynh Nguyen Bao Phuong ◽  
Dao Ngoc Chien
Keyword(s):  
Dielectric Constant ◽  
Correlation Coefficient ◽  
Frequency Band ◽  
Mutual Coupling ◽  
Return Loss ◽  
Surface Current ◽  
Electromagnetic Bandgap ◽  
Mimo Antenna ◽  
Final Design ◽  
Good Agreement

A compact 4 × 4 UWB-MIMO antenna with rejected WLAN band employing an electromagnetic bandgap (EBG) structure is presented in this paper. The MIMO antenna is electrically small (60 mm × 60 mm), printed on a FR4_epoxy substrate with the dielectric constant of 4.4 and a thickness of 1.6 mm. A mushroom-like EBG structure is used to reject the WLAN frequency at 5.5 GHz. In order to reduce the mutual coupling of the antenna elements, a stub structure acting as a bandstop filter is inserted to suppress the effect of the surface current between elements of the proposed antenna. The final design of the MIMO antenna satisfies the return loss requirement of less than −10 dB in a bandwidth ranging from 2.73 GHz to 10.68 GHz, which entirely covers UWB frequency band, which is allocated from 3.1 to 10.6 GHz. The antenna also exhibits a WLAN band-notched performance at the frequency band of 5.36–6.34 GHz while the values of all isolation coefficients are below −15 dB and the correlation coefficient of MIMO antenna is less than −28 dB over the UWB range. A good agreement between simulation and measurement is shown in this context.

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