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A novel four port multiple-input-multiple-output (MIMO) antenna at 2.4 GHz ISM band is designed in this paper. The MIMO antenna includes an octangular patch surrounded by a square ring patch. The overall system dimension is 60 × 60 × 1.6 mm3. The antenna operates in a 50 MHz bandwidth centered at 2.44 GHz. A defected ground structure (DGS) for improving the isolation between four ports is proposed...
A new method to improve isolation of MIMO antenna is presented in this letter. The main radiator is a monopole antenna. To reduce the mutual coupling among antenna ports, slots are inserted on the ground plane and the radiator is surrounded by four L-shaped parasitic strips. The simulation results show that the isolation of adjacent ports can reach below −20dB with the envelope correlation coefficient...
A novel design of patch antenna array working at three frequency bands with high port isolation is proposed. By adding the neutralization line and coupling lines, the coupling coefficient can be reduced to below −20 dB at each frequency while keeping good impedance matching at the same time.
A low-mutual coupling MIMO antenna system is presented in this paper. A cavity backed SIW antenna is designed to work at the millimeter-wave frequency at first. Then two elements of the designed antenna were integrated to achieve an MIMO system. In order to reduce the free space radiation mutual coupling, an AMC wall was inserted between two antennas. In order to design an AMC wall, a unit cell was...
In this paper, a hybrid diversity is employed to a UWB MIMO antenna to enhance its MIMO performance evaluated through envelope correlation coefficient (ECC). Polarization-diversity is achieved through vertical and horizontal orientation of elements of the MIMO antenna and evaluated through cross and co-polarized patterns at frequencies 4.5 GHz, 6.5 GHz, and 8.5 GHz. Space-diversity is achieved by,...
Recently, the technology of MIMO (Multiple-Input Multiple-Output) using multiple antennas and CA (Carrier Aggregation) using multiple frequency bands are introduced in a mobile terminal. If plural MIMO antennas are installed closely, mutual coupling between the antennas must be reduced to suppress deterioration of radiation efficiency and increase of the correlation coefficient. In previous studies,...
A compact printed monopole antenna array using neutralization line to reduce the mutual coupling is proposed. The antenna size is 40 × 80 mm2 with an impedance bandwidth of 3.1 to 12 GHz. Details of the antenna design and simulation results are presented and discussed. Both of the reflection coefficient and radiation characteristics achieve a good improvement.
We investigate multi-port ladder impedance matching (MLM) for enhancing the capacity of compact MIMO communication systems. MLM builds upon single-port matching (SPM) techniques by incorporating an additional reactance that connects adjacent antenna ports together and promises enhanced performance while maintaining good bandwidth. We demonstrate numerically for a 5-element compact MIMO system that...
This paper proposes the rectangular monopole antenna with arrow-shaped slot etching for multiple-input multiple-output (MIMO) application. The presented antenna system works efficiently in the frequency range of 3.1–10.6 GHz for ultra-wideband (UWB) communications which are defined by the Federal Communications Commission (FCC) band. The proposed antennas were fabricated on FR4 substrate with dimensions...
We examine the deployment of a large multi-user multiple-input multiple-output (MIMO) system and the resulting Energy Efficiency (EE) considering a 2D rectangular array with increasing antenna elements within a fixed physical space. The resulting increasing mutual coupling and correlation among the base station (BS) antennas are incorporated by deriving a practical mutual coupling matrix which considers...
MIMO antenna has gained lot of attention for research today due to various advantages such as increase in capacity, low signal loss and less multipath fading. Although it has many benefits, the main challenge lies in the design of MIMO Antenna i.e to reduce the mutual coupling between the antenna element and to provide high isolation. To reduce the mutual coupling and for improving the isolation,...
A MIMO (multiple input multiple output) antennas for two different shapes has been designed and studied, different isolation techniques has been analyzed in order to reduce mutual coupling between two elements. Initially, a tiny sized hexagonal shaped patch for wideband operation is designed in two MIMO elements format, a current distribution study has been carried out to reduce mutual coupling. Later...
A novel UWB antenna is consisting of elliptical structure with symmetrical slots which performs over Ultrawideband (UWB), an antenna with high isolation over − 25dB throughout the entire band. The proposed structure is designed on an FR4 substrate with dimensions of 23mm × 38mm × 1.6mm. The configuration of antenna is designed for high isolation with reflector element on the ground plane over the...
Scaling up the conventional multiple-input multiple- output (MIMO) by orders of magnitude, massive MIMO technique brings huge improvement in spectrum efficiency and energy efficiency. However, under time- division duplex (TDD) operation, the reciprocity calibration need to be necessarily investigated, since the mismatches of the transceiver radio frequency (RF) circuits at both sides of the link will...
Massive multiple-input-multiple-output (MIMO) systems deploying a large number of antennas at the base station (BS) have been shown to produce high spectral and energy efficiency (EE) under the assumptions of increasing BS physical space and critical antenna spacing. We examine the deployment of massive MIMO systems and resulting EE with a more realistic scenario considering a 2-D rectangular array...
Near-field mutual coupling between antennas is a widespread problem that may affect the performance of wireless systems. Characteristic mode analysis (CMA) presents a new approach to solve this problem and in this paper we deal with the near-field and out-of-band case. Based on the CMA, the functional and non-functional modes are discriminated, and the latter is suppressed using inductive loads. Moreover,...
In this paper, the impact of mutual coupling on LTE-R MIMO capacity for antenna array configurations in high speed railway scenario is investigated. In order to evaluate the impact of mutual coupling for different antenna array configurations, the extended 3D clustered channel model is presented primarily in this paper. The impact of mutual coupling can be added to channel models using coupling matrix...
This paper presents a design of a wideband 4-port antenna array being useful for MIMO applications. In the designed antenna array that operates over the frequency band of 7.25–10.25GHz, a leaf-shaped monopole and notch antennas are employed as the array elements. By using these orthogonal polarization elements, both low coupling level between adjacent array elements and miniaturization of the antenna...
This paper presents a simple tunable decoupling mechanism for a tri-band coupled monopole antenna working in LTE700/GSM850/900 bands for MIMO application. A parasitic scatterer with two distributed MEMS tunable capacitors is utilized to match the impedance and mitigate the effects of mutual coupling between elements. Thus, the antenna performance is enhanced significantly by minimizing the coupling...
Recently, MIMO (Multiple-Input Multiple-Output) technology is introduced in various small wireless applications. If MIMO antennas are mounted on such terminals, a strong mutual coupling is occurred because a distance between antenna elements is close. To solve this problem, a decoupling method for 2×2 MIMO connecting between two antenna elements by inductors has been developed. However in this method,...
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