scholarly journals Frequency Reconfigurable Multiband MIMO Antenna Base on Gradient Arcs for IoT Devices

2021 ◽  
Vol 10 (2) ◽  
pp. 85-93
Author(s):  
D. T. T. Tu ◽  
N. V. Sang
Keyword(s):  
Ieee 802.11 ◽  
Mutual Coupling ◽  
Complex Structure ◽  
Pin Diode ◽  
Mimo Antenna ◽  
Single Antenna ◽  
Compact Size ◽  
Ring Antenna ◽  
New Moon ◽  
Iot Devices

A frequency reconfigurable multi-band MIMO antenna is presented in this study. The single antenna consists of only one PIN diode that can change antenna operating frequencies from different quad-band to another one. Their bands not only cover the popular NB-IoT bands such as 900MHz, 1.8GHz, 2.4GHz for  Z-Wave, ZigBee, RFID, GSM communication but also contain 5G IoT bands which are 2.4GHz, 2.6 GHz and 5GHz for LTE-A, 802.11n, ac, and 5G below 10GHz. Basing on the complex structure of ring and new moon shape, the single antenna achieves a compact size of 30 mm x 30 mm x 1.6 mm which is about 76% reduction compared to a conventional ring antenna at 900MHz. Besides, a structure of gradient arcs is proposed to decrease mutual coupling among closed-spaced elements of MIMO antenna for the distance of 0.033l at the lower band from edge to edge. The proposed antennas are analyzed by CST software, VNA measurement, and IEEE 802.11 USB Adapter that the simulated, measured as well as experimental results are agreed well.

scholarly journals Double-Side Electromagnetic Band Gap Structure for Improving Dual-Band MIMO Antenna Performance

2017 ◽  
Author(s):  
Tu Thi Thanh Duong ◽  
Hoc Van Nguyen ◽  
Yem Van Vu
Keyword(s):  
Mutual Coupling ◽  
Mimo System ◽  
Equivalent Circuit Model ◽  
Dual Band ◽  
The Novel ◽  
Mimo Antenna ◽  
Paper Making ◽  
Antenna Performance ◽  
Compact Size ◽  
Band Gap Structure

A double-side EBG structure with equivalent circuit model is proposed in this paper. Making H shape on surface and H with bridge shape on ground, the novel EBG that is built on FR4 substrate with height of 1.6mm, gets compact size of 8.6x8.6 mm2 at 2.6 GHz resonant frequency. Using 1x7 EBG structures for dual-band MIMO system, several performance parameters of antenna are improved. Firstly, the mutual coupling between antenna elements gets -40dB in the lower band and -30dB in the higher one with narrow distance of 0.11l from feeding point to feeding point. Then, at 2.6GHz, the antenna gain is increased significant by 160% as well as radiation efficiency of antenna is better. This improvement is unable to get in previous EBG studies

scholarly journals Compact Wide-Band and Low Mutual Coupling MIMO Metamaterial Antenna using CPW Feeding for LTE/Wimax Applications

2018 ◽  
Author(s):  
Duong Thi Thanh Tu ◽  
Nguyen Tuan Ngoc ◽  
Vu Van Yem
Keyword(s):  
Mutual Coupling ◽  
Coplanar Waveguide ◽  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Handheld Devices ◽  
Defected Ground Structure ◽  
Mimo Antenna ◽  
Compact Size ◽  
Metamaterial Antenna ◽  
Input Multiple Output

In this paper, a metamaterial antenna is designed by using coplanar waveguide (CPW) feeding to obtain wideband and compact size. The Multiple-Input Multiple-Output (MIMO) antenna is constructed by placing side-by-side two single metamaterial antennas which are based on the modified composite right/left handed (CRLH) model. The proposed antenna covers 22% of the experimental bandwidth for both cases of single and MIMO antennas. Implemented in FR4 substrate with the height of 1.6 mm, the antenna is compact in size with radiating patch dimension of 5.75x14 mm2 at 3.5 GHz resonant frequency that is suitable for Long Term Evolution (LTE)/Wimax applications in handheld devices. Furthermore, the combination of Defected Ground Structure (DGS) and enlarged ground of coplanar structure has solved the challenge of mutual coupling between elements in the MIMO metamaterial antenna using CPW feeding. With the distance of 0.46\lambda_0 between feeding points, the MIMO antenna obtains the high isolation of under −20 dB for a huge bandwidth with a good agreement between simulations and measurements. DOI: 10.32913/rd-ict.vol2.no15.676

scholarly journals Decoupled and Descattered Monopole MIMO Antenna Array with Orthogonal Radiation Patterns

2020 ◽  
Author(s):  
Hussain Al-Rizzo ◽  
Ayman A. Isaac ◽  
Sulaiman Z. Tariq ◽  
Samer Yahya
Keyword(s):  
Antenna Array ◽  
Mutual Coupling ◽  
Ground Plane ◽  
Design Concept ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Radiation Patterns ◽  
Mimo Antenna ◽  
Single Antenna ◽  
Novel Design

This chapter introduces a novel design concept to reduce mutual coupling among closely-spaced antenna elements of a MIMO array. This design concept significantly reduces the complexity of traditional/existing design approaches such as metamaterials, defected ground plane structures, soft electromagnetic surfaces, parasitic elements, matching and decoupling networks using a simple, yet a novel design alternative. The approach is based on a planar single decoupling element, consisting of a rectangular metallic ring resonator printed on one face of an ungrounded substrate. The decoupling structure surrounds a two-element vertical monopole antenna array fed by a coplanar waveguide structure. The design is shown both by simulations and measurements to reduce the mutual coupling by at least 20 dB, maintain the impedance bandwidth over which S11, is less than −10 dB, and reduce the envelope correlation coefficient to below 0.001. The boresight of the far-field radiation patterns of the two vertical monopole wire antennas operating at 2.4 GHz and separated by 8 mm (λo/16), where λo is the free-space wavelength at 2.45 GHz, is shown to be orthogonal and inclined by 45° with respect to the horizontal (azimuthal) plane while maintaining the shape of the isolated single antenna element.

scholarly journals A Compact 5G Decoupling MIMO Antenna Based on Split-Ring Resonators

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Ziyu Xu ◽  
Qisheng Zhang ◽  
Linyan Guo
Keyword(s):  
Antenna Array ◽  
Mutual Coupling ◽  
Coupling Effect ◽  
Antenna System ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Mimo Antenna ◽  
Compact Size ◽  
5 Ghz

A compact planar multiple-input multiple-output (MIMO) antenna array for 5G band is proposed in this paper. To improve the isolation of compact microstrip antenna array, this paper mainly presents an electromagnetic resonant ring method for MIMO antenna array. The proposed antenna can cover both the 3.3-3.6 GHz and 4.8-5 GHz bands proposed for the 5G band. The antenna proposed in this paper consists of two symmetrical meandered monopole radiators, grid structures, and a Y-shape element. Two different sizes of split-ring resonators (SRRs) are used to suppress the interference of the coupled signal to the antenna system; thereby it can reduce the mutual coupling effect. The experimental results show that the mutual coupling between the two elements is below -25 dB in both of the bands after adding the SRRs. And this antenna is only 23×19 mm2. Its compact size and structure can be used as a mobile terminal antenna.

scholarly journals Mutual coupling reduction with a wideband planar decoupling structure for UWB–MIMO antennas

2018 ◽  
Vol 10 (10) ◽  
pp. 1143-1154 ◽  
Author(s):  
Alaa H. Radhi ◽  
R. Nilavalan ◽  
Yi Wang ◽  
H. S. Al-Raweshidy ◽  
Amira A. Eltokhy ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Common Ground ◽  
Multiple Input Multiple Output ◽  
Ultra Wideband ◽  
Performance Study ◽  
Uwb Antenna ◽  
Mimo Antenna ◽  
Compact Size ◽  
Uwb Applications ◽  
Mutual Coupling Reduction

AbstractA new planar multiple-input–multiple-output (MIMO) antenna for ultra wideband (UWB) applications is presented. The proposed antenna operates over the frequency band from 3.1 to 10.6 GHz and it consists of two identical circular monopoles on an FR4 substrate. The wide isolation is achieved through a novel planar decoupling structure that is being inserted between the dual antennas. Moreover, a center slot is etched on the common ground to further increase isolation. The effectiveness of the decoupling structure is analyzed, and performance study has been performed to investigate the mutual coupling reduction. A good isolation of more than 31 dB has been achieved through the entire UWB band (more than 12 dB improvement over the reference antenna). The proposed UWB antenna with and without the wideband decoupling structure has been investigated and verified both numerically and experimentally. The measurement results of the proposed UWB–MIMO antenna are in good agreement with the simulation results. The proposed UWB antenna has been compared with previous works regarding antenna size, geometric complexity, bandwidth, and isolation level. The proposed antenna has some outstanding characteristics such as a geometric simplicity, compact size, broad bandwidth, and low correlation which give the antenna an excellent diversity performance and a good candidate for UWB applications.

SecurePilot: Improving Wireless Security of Single-Antenna IoT Devices

2021 ◽  
pp. 1-1
Author(s):  
Huangxun Chen ◽  
Qianyi Huang ◽  
Chenyu Huang ◽  
Chenchen Liu ◽  
Tony Xiao Han ◽  
...  
Keyword(s):  
Wireless Security ◽  
Single Antenna ◽  
Iot Devices

A printed multiband MIMO antenna with decoupling element

2019 ◽  
Vol 11 (4) ◽  
pp. 413-419 ◽  
Author(s):  
Ziyu Xu ◽  
Qisheng Zhang ◽  
Linyan Guo
Keyword(s):  
Mutual Coupling ◽  
Surface Current ◽  
Antenna System ◽  
Antenna Element ◽  
Coupling Mechanism ◽  
Mimo Antenna ◽  
Resonant Modes ◽  
Monopole Antennas ◽  
Input Multiple Output ◽  
Ground Plate

AbstractA printed multiband Multi-Input Multiple-Output (MIMO) antenna is proposed in this paper. This MIMO antenna system comprises two symmetric printed monopole antennas. Each antenna element consists of multiple bend lines, producing four resonant modes and covering the GSM900, PCS, LTE2300, and 5G bands. Simulated and measured results prove that the proposed MIMO antenna can be applied to traditional 2G, 3G, 4G, and present 5G mobile communication. By etching four inverted L-shaped grooves on its ground plate, mutual coupling between the adjacent antenna elements has been suppressed. This makes the |S21| at all four resonant modes is lower than −40 dB. In addition, its low coupling mechanism has been analyzed by surface current distribution. The designed multiband MIMO antenna provides an idea of reference to realize low mutual coupling between antenna elements, which is also realizable in infrared or optical regimes with appropriate designs.

scholarly journals Packet-level and IEEE 802.11 MAC frame-level Network Traffic Traces Data of the D-Link IoT devices

Data in Brief ◽  
2021 ◽  
pp. 107208
Author(s):  
Rajarshi Roy Chowdhury ◽  
Sandhya Aneja ◽  
Nagender Aneja ◽  
Pg Emeroylariffion Abas
Keyword(s):  
Ieee 802.11 ◽  
Network Traffic ◽  
Ieee 802.11 Mac ◽  
Iot Devices ◽  
802.11 Mac
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