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.

scholarly journals Compact Ultra-Wide Band MIMO Antenna System for Lower 5G Bands

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Haitham AL-Saif ◽  
Muhammad Usman ◽  
Muhammad Tajammal Chughtai ◽  
Jamal Nasir
Keyword(s):  
Mutual Coupling ◽  
Return Loss ◽  
Wide Band ◽  
Antenna System ◽  
Ultra Wide Band ◽  
Center Frequency ◽  
Mimo Antenna ◽  
Total Structure ◽  
Good Agreement ◽  
Array Geometry

This paper presents a novel compact 2 × 2 planar MIMO antenna system with ultra-wide band capability. Antenna system is specifically designed to target lower 5th generation operating bands ranging from 2 GHz to 12 GHz. This band also covers the IEEE 802.11 a/b/g/n/ac. The antenna array geometry has been simulated using CST MWS. The design is extremely miniaturized with total structure size of 13×25×0.254 mm3. The simulated and measured results have been presented. Measured and simulated return loss values for designed antenna are less than −10 dB over the operating band and lowest values of −35 dB and −32.5 dB can been seen at 5.2 GHz and 9.2 GHz, respectively, whereas at the center frequency the return loss is −25.2 dB. The mutual coupling between both elements is less than −20 dB over the transmission bandwidth. Simulated and measured radiation patterns in E and H planes at center frequency show nearly isotropic far fields. The maximum gain is measured as 4.8 dB. Promising results of Envelope Correlation Coefficient and gain diversity of the design have been achieved. Simulated and measured results are found in good agreement. The fractional bandwidth of antenna is measured as 143.2% which satisfies its ultra-wide band response.

scholarly journals A Novel Metamaterial MIMO Antenna with High Isolation for WLAN Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Nguyen Khac Kiem ◽  
Huynh Nguyen Bao Phuong ◽  
Quang Ngoc Hieu ◽  
Dao Ngoc Chien
Keyword(s):  
Frequency Band ◽  
Surface Current ◽  
Defected Ground Structure ◽  
Mimo Antenna ◽  
High Isolation ◽  
Left Handed ◽  
Metamaterial Antenna ◽  
Final Design ◽  
Edge Separation ◽  
Effect Of Surface

A compact2×2metamaterial-MIMO antenna for WLAN applications is presented in this paper. The MIMO antenna is designed by placing side by side two single metamaterial antennas which are constructed based on the modified composite right/left-handed (CRLH) model. By adding another left-handed inductor, the total left-handed inductor of the modified CRLH model is increased remarkably in comparison with that of conventional CRLH model. As a result, the proposed metamaterial antenna achieves 60% size reduction in comparison with the unloaded antenna. The MIMO antenna is electrically small (30 mm × 44 mm) with an edge-to-edge separation between two antennas of0.06λ0at 2.4 GHz. In order to reduce the mutual coupling of the antenna, a defected ground structure (DGS) is inserted to suppress the effect of 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 2.38 GHz to 2.5 GHz, which entirely covers WLAN frequency band allocated from 2.4 GHz to 2.48 GHz. The antenna also shows a high isolation coefficient which is less than −35 dB over the operating frequency band. A good agreement between simulation and measurement is shown in this context.

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 Design of a MIMO Antenna with Improved Isolation Using MNG Metamaterial

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Youngki Lee ◽  
Deukhyeon Ga ◽  
Jaehoon Choi
Keyword(s):  
Correlation Coefficient ◽  
Return Loss ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Impedance Bandwidth ◽  
Negative Permeability ◽  
Split Ring ◽  
Mimo Antenna ◽  
Term Evolution

A multi-input multi-output (MIMO) antenna with improved isolation using an interdigital split ring resonator (SRR) is proposed. The necessary impedance bandwidth is obtained by utilizing the coupling between the meander strip and an invertedLstrip. Using interdigital SRR, a negative permeability was generated, while achieving improved isolation between the two radiating elements. The fabricated antenna satisfies the 10 dB return loss in the long-term evolution (LTE) band 40 from 2.3 GHz to 2.4 GHz. The measured peak gains of the two elements were 2.0 dBi and 1.3 dBi. The measured envelope correlation coefficient was less than 0.16 over the frequency band of interest.

scholarly journals Center-Slotted Wideband Hybrid 10 dB Coupler

2021 ◽  
Author(s):  
Sehabeddin Taha Imeci ◽  
◽  
Kemal Temur ◽  
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Frequency Range ◽  
Coupling Region ◽  
Parallel Lines ◽  
Manufacturing Errors ◽  
Final Design ◽  
Hybrid Coupler ◽  
5 Ghz ◽  
Good Agreement

In this paper, a wideband microstrip hybrid coupler designed, simulated, built and tested. These couplers have advantage of easy fabrication, lightweight and incorporation with other microwave devices and validated using 3D planar electromagnetic softwares like Sonnet Suites. The final design is composition of two parallel lines with symmetric slits and a center slot. Directional coupler is designed and simulated to operate in the frequency range from 1 GHz to 5 GHz with 2.4 Ghz coupling -10 dB return loss bandwidth between 1.6 - 4 GHz. The fabricated coupler shows good agreement between measured and simulated results with very low isolation characteristics. Four symmetric orthogonal U-Shaped structures at the center of the coupling region distinguishes the proposed design with other works. It makes significant improvement in calculation duration thereby achieving lower response latency and lowers the possible manufacturing errors compared with previously published similar works.

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 Design of a Compact MIMO Antenna Using Coupled Feed for LTE Mobile Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xing Zhao ◽  
Youngki Lee ◽  
Jaehoon Choi
Keyword(s):  
Correlation Coefficient ◽  
Mobile Applications ◽  
Return Loss ◽  
Impedance Matching ◽  
Antenna Element ◽  
Mimo Antenna ◽  
First Order ◽  
Term Evolution ◽  
Radiating Element

A compact multi-input multi-output (MIMO) antenna with a coupled feed structure for 4th generation (4G) handsets is proposed for operation in long-term evolution (LTE) band 13 (0.746 GHz–0.787 GHz). The MIMO antenna consists of two symmetrically distributed identical antenna elements. The size of each element is limited to 20 mm × 10 mm × 5 mm (λ0=392 mm at 0.765 GHz), and the separation between different elements is minimized to 15 mm. Each antenna element contains a Z-shaped coupled feed strip and a simple folded monopole-type radiating element. The simple folded radiating element supports two monopole modes (first order) excited at adjacent frequencies to achieve broadband performance. The coupled feed strip effectively modifies impedance matching and maintains good isolation. The proposed antenna has a 6 dB return loss bandwidth of 55 MHz (0.735 GHz–0.79 GHz) and isolation above 12 dB without the use of an additional isolation enhancement element. Moreover, the envelope correlation coefficient (ECC) is maintained below 0.5 over the designed frequency band.

scholarly journals Wide band multi stage eight way Wilkinson power divider for defense applications

2018 ◽  
Vol 7 (3) ◽  
pp. 1304
Author(s):  
M Siva Charan ◽  
A Rajasekhar ◽  
K V. Venkateswara Rao ◽  
Ch Lakshmi Prasanna ◽  
Praveen Vummadisetty. Naidu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Microstrip Line ◽  
Return Loss ◽  
Wide Band ◽  
Simulation Software ◽  
Power Divider ◽  
Multi Stage ◽  
Wilkinson Power Divider ◽  
Equal Power ◽  
Good Agreement

In this paper, a compact 8 way microstrip line Wilkinson Power Divider (WPD) is designed and proposed. The equal power divider con-sists of multiple multi-section WPD’s with isolation resistors. By utilizing the multi-sections concept, a remarkably increase in the band-width is observed. In the design process, RT 5880 substrate is used with the thickness of 0.8 mm and dielectric constant of 2.2 and loss tangent of 0.0004. The simulated results such as return loss, insertion loss and isolation are plotted by using ADS simulation software and obtained results show good agreement. 

scholarly journals MIMO Antenna Performances on Microstrip Antenna with EBG Structure for WLAN Applications

2015 ◽  
Vol 773-774 ◽  
pp. 756-760
Author(s):  
Nur Nasyilla Othman ◽  
Wan Noor Najwa Wan Marzudi ◽  
Nur Faizah Mohamad Yusof ◽  
Zuhairiah Zainal Abidin ◽  
Siti Zarina Mohamad Muji ◽  
...  
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Correlation Coefficients ◽  
Reflection Coefficients ◽  
Scattering Parameters ◽  
Electromagnetic Bandgap ◽  
Practical Applications ◽  
Mimo Antenna ◽  
Capacity Loss ◽  
Coupling Correlation

A dual microstrip MIMO antenna with Electromagnetic Bandgap (EBG) structures presented. EBG structures proposed in order to reduce the coupling between elements .Simulated scattering parameters with and without EBG structures compared. An evaluation of MIMO antenna characteristics is presented, with the analysis of the mutual coupling, correlation coefficients, total active reflection coefficients (TARC), capacity loss and channel capacity using Computer Simulation Technology (CST) Microwave Studio Software. The proposed antenna is a good candidate for WLAN practical applications.

Sign in / Sign up

Export Citation Format

Share Document