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

REV Journal on Electronics and Communications ◽

10.21553/rev-jec.135 ◽

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

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Design of a compact MIMO antenna system with reduced mutual coupling

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078714001287 ◽

2014 ◽

Vol 8 (1) ◽

pp. 117-124 ◽

Cited By ~ 8

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.

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Compact Four-Port Dual-Sense Circularly Polarized Stack-Up Patch Antenna for UHF/MW-RFID MIMO System

International Journal of Antennas and Propagation ◽

10.1155/2021/2118059 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Enze Zhang ◽

Jinghui Qiu

Keyword(s):

Patch Antenna ◽

Mimo System ◽

Multiple Input Multiple Output ◽

Dual Band ◽

Uhf Rfid ◽

Circularly Polarized ◽

Antenna Performance ◽

Compact Size ◽

Multiple Input ◽

Input Multiple Output

A four-port dual-band dual circularly polarized (CP) stack-up patch antenna is introduced for multiple-input-multiple-output (MIMO) RFID application. The proposed antenna adopts two FR 4 substrates and one Rogers Ro4350b substrates. Two pairs of isolated ports work at FCC UHF/MW-RFID bands (0.902–0.928 and 2.4–2.485 GHz) with port isolations of 20 dB and 25 dB, respectively. Four inverted-F radiating elements fed with a 90° phase-delay feeding network realize the CP radiation at the FCC UHF-RFID band (0.902–0.928 GHz). The corner-truncated square slot and patch are implemented to obtain CP modes at the MW-RFID band. The relative impedance bandwidths in the FCC UHF and MW band are 10.9% and 9.4%, respectively, with peak gains of 4.1 and 7.2 dBic. The antenna’s MIMO performance of envelope correlation coefficient (ECC) is lower than 0.01, and diversity gain (DG) is close to 10 dB. Thanks to the stack-up configuration, the dual-band RFID antenna realizes good antenna performance with a compact size of 0.6 × 0.6 × 0.07 λ3.

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Decoupling of Dual-band Closely Spaced MIMO Antennas Based on Novel Coupled Resonator Structure

Frequenz ◽

10.1515/freq-2017-0199 ◽

2018 ◽

Vol 72 (9-10) ◽

pp. 437-441

Author(s):

XiaoJun Zou ◽

GuangMing Wang ◽

YaWei Wang ◽

BinFeng Zong

Keyword(s):

Mutual Coupling ◽

Mimo System ◽

Impedance Matching ◽

Dual Band ◽

Total Efficiency ◽

Mimo Antennas ◽

Resonator Structure ◽

Compact Size ◽

Wireless Terminal ◽

Coupled Resonator

Abstract A pair of dual-band closely spaced MIMO monopole antenna array working at WLAN 2.45/5.25GHz with a dual-band coupled resonator structure for decoupling is proposed, the edge-to-edge distance of which is 0.0735 ${^{\lambda _0}}$ at 2.45GHz and 0.1575 ${^{\lambda _0}}$ at 5.25GHz. Simulation and measurement on coupled antennas and decoupled antennas indicate that mutual coupling reductions of 24.52dB and 26.57dB at two frequencies are achieved. With good impedance matching, improved total efficiency and increased channel capacity, the proposed structure owns good applicability, compact size and effective decoupling capability, and is promising in the application of wireless terminal MIMO system.

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Design and Analysis of MIMO Dual Band Patch Antenna for 5G New Radio Applications in Mobile Terminals

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.36072 ◽

2021 ◽

Vol 9 (VI) ◽

pp. 5446-5451

Author(s):

Swati Dhandade

Keyword(s):

Mobile Communications ◽

Antenna Design ◽

Dual Band ◽

Slight Variation ◽

Band Frequency ◽

Mimo Antenna ◽

High Isolation ◽

New Radio ◽

Compact Size ◽

5G Mobile Communications

This paper presents a dual-band MIMO antenna design with compact size for 5G communication under 6 GHz band frequency. The metallic monopole stub structure is used to miniaturization of antenna. The L-shape monopole antenna is modified by adding semi-circular element in radiating structure of monopole to obtain dual-band resonance. The High isolation is achieved by employing T-shaped stub in ground plane.It has compact size is 45 mm × 25 mm × 1.6 mm3. The proposed Dual Band MIMO antenna has been design on FR4 material with ɛr = 4.4 with 1.6 thickness. The proposed antenna has 5G application in the bands of 2.5 GHz (2.34 GHz-2.62 GHz) and 3.5 GHz (3.20 GHz-5.20 GHz). The bandwidth of antenna getting 320MHz and 2500MHz at 2.5GHz and 3.5GHz respectively. The Isolation (S21) of proposed antenna is -31.2 dB at 2.5 GHz and -19.5 dB at 3.5 GHz. VSWR is less than 1.06 for both the bands. The designed dual band MIMO antenna covers 5G bands of 2.3-2.4GHz (n30/n40), 2.4-2.5GHz (n7/n38/n41/n90), and 3.2-5.2GHz (n77/n78/n80). The experimental and simulated results observed good matching except some slight variation. This proposed dual band MIMO antenna is suitable for 5G mobile Communications.

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

International Journal of Antennas and Propagation ◽

10.1155/2020/2965767 ◽

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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Modified U-Shaped Resonator as Decoupling Structure in MIMO Antenna

Electronics ◽

10.3390/electronics9081321 ◽

2020 ◽

Vol 9 (8) ◽

pp. 1321

Author(s):

Amjad Iqbal ◽

Ahsan Altaf ◽

Mujeeb Abdullah ◽

Mohammad Alibakhshikenari ◽

Ernesto Limiti ◽

...

Keyword(s):

Multiple Input Multiple Output ◽

Equivalent Circuit Model ◽

Separation Distance ◽

Antenna System ◽

Parametric Modelling ◽

Mimo Antenna ◽

Antenna Performance ◽

Multiple Input ◽

Input Multiple Output ◽

Simple Assembly

This paper presents an isolation enhancement of two closely packed multiple-input multiple-output (MIMO) antenna system using a modified U-shaped resonator. The modified U-shaped resonator is placed between two closely packed radiating elements resonating at 5.4 GHz with an edge to edge separation distance of 5.82 mm (λ∘/10). Through careful adjustment of parametric modelling, the isolation level of −23 dB among the densely packed elements is achieved. The coupling behaviour of the MIMO elements is analysed by accurately designing the equivalent circuit model in each step. The antenna performance is realized in the presence and absence of decoupling structure, and the results shows negligible effects on the antenna performance apart from mutual coupling. The simple assembly of the proposed modified U-shaped isolating structure makes it useful for several linked applications. The proposed decoupling structure is compact in nature, suppress the undesirable coupling generated by surface wave and nearby fields, and is easy to fabricate.

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