scholarly journals DESIGN AND ANALYSIS OF COMPACT METAMATERIAL MIMO ANTENNA FOR WLAN APPLICATIONS

2019 ◽  
Vol 57 (2) ◽  
pp. 223
Author(s):  
Hoa Nguyen Thi Quynh ◽  
Sy Tuan Tran ◽  
Huu Lam Phan ◽  
Duy Tung Phan
Keyword(s):  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Split Ring Resonator ◽  
Antenna Element ◽  
Mimo Antenna ◽  
Complementary Split Ring Resonator ◽  
Antenna Performance ◽  
Multiple Input ◽  
Input Multiple Output ◽  
The Individual

A compact three-port metamaterial multiple-input-multiple-output (MIMO) antenna using complementary split-ring resonator (CSRR) loaded ground have demonstrated in order to miniaturize the size and improve the antenna performance. The antenna is designed on FR4 material and simulated by HFSS software. By loading CSRRs in the ground plane, the size reduction of 77% of the individual patch antenna element is achieved, which appeared to be the major reason for the obtained the compact MIMO antenna. Furthermore, the simulated results show that the proposed MIMO antenna achieves the total gain higher than 5 dB, the isolation less than -11 dB, the envelope correlation coefficient (ECC) value lower than 0.015, and the bandwidth of 100 MHz through the whole WLAN band from 2.4 GHz to 2.484 GHz, indicating promises for WLAN applications.

scholarly journals MIMO­­­-CSRR Antenna for ISM Band Applications

2021 ◽  
Author(s):  
satish kumar ◽  
Gunasekaran Thangavel ◽  
Said Amer Salim Al Ismaili Ismaili ◽  
Balambigai Subramanian
Keyword(s):  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Split Ring Resonator ◽  
Antenna System ◽  
Antenna Element ◽  
Mimo Antenna ◽  
Ism Band ◽  
Complementary Split Ring Resonator ◽  
Single Antenna ◽  
Input Multiple Output

Abstract For the operation of 2.45GHz ISM band, a 2x2 Multiple Input Multiple Output (MIMO) antenna system is designed and fabricated. Complementary Split Ring Resonator (CSRR) is used in the MIMO patch and loaded on its ground plane to miniaturize the single antenna element. The single patch antenna element of 14x18 mm2 is fixed in a board of the Designed MIMO antennae system measuring 100x50x0.8 mm3. The antenna is tested by measuring radiation pattern, gain, VSWR, mutual coupling and return loss. The results of the Designed antenna systems are in good agreement with the simulations. In comparison to a conventional microstrip antenna, the Designed antenna achieves a 75% reduction in the resonant frequency.

scholarly journals A High Isolation MIMO Antenna without Decoupling Structure for LTE 700 MHz

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Yanjie Wu ◽  
Yunliang Long
Keyword(s):  
Impedance Matching ◽  
Multiple Input Multiple Output ◽  
Monopole Antenna ◽  
Antenna Element ◽  
Mimo Antenna ◽  
High Isolation ◽  
Antenna Performance ◽  
Measurement Results ◽  
Multiple Input ◽  
Input Multiple Output

This paper presents a long-term evolution (LTE) 700 MHz band multiple-input-multiple-output (MIMO) antenna, and high isolation between the two symmetrical antenna elements is obtained without introducing extra decoupling structure. Each antenna element is a combination antenna of PIFA and a meander monopole antenna. The end of the PIFA and the meander monopole antenna are, respectively, overlapped with the 50 Ω microstrip feed line, the two overlapping areas produce additional capacitance which can be considered decoupling structures to enhance the isolation for the MIMO antenna, as well as the impedance matching of the antenna elements. The MIMO antenna is etched on FR4 PCB board with dimensions of 71 × 40 × 1.6 mm3; the edge-to-edge separation of the two antenna elements is only nearly 0.037 λat 700 MHz. Both simulation and measurement results are used to confirm the MIMO antenna performance; the operating bandwidth is 698–750 MHz withS11≤−6 dB andS21≤−23 dB.

scholarly journals CSRR Loaded 2x1 Triangular MIMO Antenna for LTE Band Operation

2017 ◽  
Vol 6 (3) ◽  
pp. 78 ◽  
Author(s):  
C. J. Malathi ◽  
D. Thiripurasundari
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Split Ring Resonator ◽  
Antenna System ◽  
Antenna Element ◽  
Single Element ◽  
Mimo Antenna ◽  
Antenna Miniaturization ◽  
Input Multiple Output

A 2´1 (two-element) multiple-input multiple-output (MIMO) patch antenna system is designed and fabricated for (2.43 – 2.57) GHz LTE band 7 operation. It uses comple-mentary split -ring resonator (CSRR) loading on its ground plane for antenna miniaturization. This reduces the single-element antenna size by 76%. The total board size of the proposed MIMO antenna system, including the GND plane is 50´50´0.8mm3, while the single-patch antenna element has a size of 18.5 ´16mm2. The antenna is fabricated and tested. Measured results are in good agreement with simulations. A minimum measured isolation of 10 dB is obtained given the close interelement spacing of 0.17λ.

Compact 2x2 and 4x4 MIMO Antenna Systems for 5G Automotive Applications

2021 ◽  
Vol 36 (6) ◽  
pp. 762-778
Author(s):  
Mohamed Khalifa ◽  
Ahmad Yacoub ◽  
Daniel Aloi
Keyword(s):  
Mimo Systems ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Compact Structure ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Passive Isolation ◽  
The Individual ◽  
Antenna Systems

In this paper, three Vehicular multiple-input multiple-output (MIMO) 5G antenna systems have been constructed from using a newly developed 5G cellular branched Monopole element are presented. The MIMO systems operates in the 5G frequency bands (617MHz- 5GHz) with a compact structure that allows for up to four elements to be integrated in the same Sharkfin. The 3 configurations of MIMO systems have been simulated using HFSS, measured on a 1-meter ground plane (GND), then measured on a vehicle roof and the individual antenna parameters in terms of reflection coefficient and efficiency have captured. The MIMO antenna systems performance in terms of passive isolation, combined radiation pattern, envelope correlation coefficient (ECC), and diversity gain (DG) have been reported and discussed.

Dual-band-notched antenna for UWB MIMO applications

2015 ◽  
Vol 9 (2) ◽  
pp. 381-386 ◽  
Author(s):  
Zamir Wani ◽  
Dinesh Kumar
Keyword(s):  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Split Ring Resonator ◽  
Antenna System ◽  
Ultra Wideband ◽  
Dual Band ◽  
Compact Antenna ◽  
Complementary Split Ring Resonator ◽  
Multiple Input ◽  
Input Multiple Output

In this report, a compact antenna system with dual-band-notched characteristics is proposed for ultra-wideband (UWB) multiple-input multiple-output (MIMO) applications. Two antenna elements are placed side by side and fed with matched microstrip lines on a substrate with an area of 35 × 30 mm2. Notched characteristics at WiMAX (3.4–3.6 GHz) and WLAN (5.725–5.825 GHz) have been achieved using complementary split ring resonator (SRR) slots etched in both the antenna elements. Electromagnetic isolation between the two elements close to each other is achieved using a ground T-stub and slots etched in the ground plane. Antenna system has been tested and measured results are close to the desired ones. Measured isolation >20 dB is obtained in most of the UWB bands. The proposed antenna system meets the requirements well for MIMO applications.

scholarly journals Circularly Polarized Wideband Fabric Stealth Multiple-Input Multiple-Output Antenna for Ultrawideband Applications Useful for Wireless Systems Wearable on Garments

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Pillalamarri Laxman ◽  
Anuj Jain
Keyword(s):  
Human Body ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Wireless Devices ◽  
Circularly Polarized ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output

Stealth wearable wireless devices are gaining much attention in the personal security and fashion designing industry. A multiple-input multiple-output wideband circularly polarized antenna wearable on a dress (textile-related), which is immune to bending, is described in this paper, where a wearable on fabric dress application uses the MIMO techniques. It consists of two multiple-input multiple-output types of antenna elements: the resonating elements are created resembling a beautiful peacock shape and the ground plane is appropriately designed. A voltage is applied to each antenna element; the ground plane contains a microstrip transmission line-fed and a rectangular upside-down L-shaped (vertically flipped) strip used for circular polarizing. The antenna covers a 3 dB axial-ratio-band-width (ARBW) value of 5.20–7.10 GHz and impedance bandwidth (S11 less than −10 dB) of 03.60–13.0 GHz. The proposed attachable wearable fabric (textile) multiple-input multiple-output wideband antenna exhibits envelope correlation coefficient (ECC) <0.02, diversity gain (DG) >9.96, channel capacity loss (CCL) <0.2 b/s/Hz, total active reflective coefficient (TARC) <−10 dB, mean effective gain (MEG) ratio within ±0.5 dB. There is dual-sense circular polarization in this antenna and high isolation between resonating elements (higher than 18). A specific absorption rate (SAR) of the proposed antenna for human tissues specimen is also discussed for different situations related to the human body. The overall size of the proposed CP textile MIMO antenna is 34 : 5 × 42 × 1 mm3. Because of its clothing layers (textile), practical performance, and miniature size, the designed MIMO antenna may be helpful for wearable on cloths on human body wireless devices and systems. The proposed antenna can be made unrecognizable because of the beautiful peacock design that can easily mix with the designs of fabric (in the fashion dress). The simulated antenna was fabricated with the help of conventional manual fabrication techniques and tested in real-time situations. The edge-to-edge distance amid the MIMO radiating antennas is 14.2 mm, and the achieved isolation is greater than 18 dB after optimization of the proposed antenna.

Feather-shaped super wideband MIMO antenna

2020 ◽  
pp. 1-9 ◽  
Author(s):  
Sarthak Singhal
Keyword(s):  
Coplanar Waveguide ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Spatial Diversity ◽  
Antenna Element ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Operating Bandwidth ◽  
Rectangular Notch

Abstract Two configurations of a modified feather-shaped antenna element are proposed for super wideband (SWB) multiple-input multiple-output (MIMO) applications. The antenna element geometry comprises of a circular slot-loaded feather-shaped radiator and rectangular notch-loaded quarter elliptical coplanar waveguide ground plane. An operating bandwidth of 4.4–51.5 GHz with inter-port isolation, S21 ≥ 15 dB for spatial diversity configuration, and 3.8–51.5 GHz with S21 ≥ 15 dB in pattern diversity configuration are achieved. The footprints of the antenna configurations are 17 × 33 and 31 × 31 mm2. Both configurations exhibited an envelope correlation coefficient of <−20 dB. The proposed MIMO configurations are fabricated and experimentally validated. The designed antenna configurations are SWB and compact.

Design of an interlocked four-port MIMO antenna for UWB automotive communications

2021 ◽  
pp. 1-8
Author(s):  
M. Saravanan ◽  
R. Kalidoss ◽  
B. Partibane ◽  
K. S. Vishvaksenan
Keyword(s):  
Multiple Input Multiple Output ◽  
Performance Estimation ◽  
Ultra Wideband ◽  
Antenna Element ◽  
Frequency Range ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Operating Bandwidth ◽  
Peak Gain

Abstract The design, analysis, fabrication, and testing of a four-port multiple-input multiple-output (MIMO) antenna is reported in this paper for automotive communications. The MIMO antenna is constructed using the basic antenna element exploiting a slot geometry. Two such antennas are developed on the same microwave laminate to develop a two-port MIMO antenna. Two such microwave laminates are interlocked to create the four-port MIMO scheme. The most distinct feature of the proposed architecture is that the inter-port isolation is well-taken care without the need for an external decoupling unit. The four-port MIMO antenna has an overall volume of 32 × 15 × 32 mm3. The prototype MIMO antenna is fabricated and the measurements are carried out to validate the simulation results. The antenna offers ultra-wideband (UWB) characteristics covering the frequency range of 2.8–9.5 GHz. The average boresight gain of the antenna ranges from 3.2 to 5.41 dBi with the peak gain at 8 GHz. The simulated efficiency of the antenna is greater than 73% within the operating bandwidth. The MIMO parameters such as envelope correlation coefficient, diversity gain, and mean effective gain are evaluated and presented. The appropriateness of the proposed antenna for deployment in the shark fin housing of the present-day automobiles is verified using on-car performance estimation.

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 Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Abubaker Ahmed Elobied ◽  
Xue-Xia Yang ◽  
Ningjie Xie ◽  
Steven Gao
Keyword(s):  
Multiple Input Multiple Output ◽  
Dual Band ◽  
Antenna Element ◽  
Mimo Antenna ◽  
High Isolation ◽  
Rectangular Patch ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Proximity Coupling

This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. The HMSIW cavity is excited by a coaxial probe, whereas the rectangular patch is energized through proximity coupling by the radiating aperture of HMSIW. The antenna elements can be closely placed using the rotation and orthogonal arrangement for a 2 × 2 array. Small neutralization lines at the center of the MIMO antenna can increase the isolation among its elements by around 10 dB in the lower band and 5 dB in the higher band. A prototype of the MIMO antenna is fabricated and its performance is measured. The measured results show that the resonant frequencies are centered at 4.43 and 5.39 GHz with bandwidths of 110 and 80 MHz and peak gains of 6 and 6.4 dBi, respectively. The minimum isolation in both bands is greater than 35 dB. The envelope correlation coefficient is lower than 0.005 within two operating bands.

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