Abstract:Abstract-A novel four-element multiple-input-multiple-output (MIMO) antenna system for LTE 2300 and 2.45 GHz ISM applications is presented. The total size of the proposed MIMO antenna system is 34 mm × 18 mm, and the whole antenna system has a wide working bandwidth of 350 MHz (2.19-2.54 GHz). The measured isolation between antenna elements is higher than 15 dB with a close edgeto-edge separation of 0.03λ. Correlation coefficient of the MIMO antenna system is lower than 0.12, which can meet the requirements of… Show more
“…Besides, the bandwidth percentage and gain of this antenna are 8.8% and 4.3 dBi, respectively. Similarly, the antenna in [29] and [30], the isolation between antenna is only 15 dB, while the gains of antennas are very low (lesser than 2 dBi). Fig.…”
In this paper, a multiple input multiple output antenna which operates at 5.8 GHz for wireless local area network applications is proposed. The proposed antenna is composed of two sets of four elements antenna array (2 × 2) on the top and a novel metamaterial structure on the ground plane. Here, the ground plane, which includes a lattice of 2 × 5 unit cells of metamaterial structure, is utilized in order to improve parameters of the antenna. Thanks to the proposed metamaterial structure, not only gain and bandwidth of antenna are enhanced, but also mutual coupling is reduced. The final design, with an overall size of 137 × 77 × 3.048 mm3, resulted in a |S11| <−10 dB bandwidth of 1.78 GHz and a peak gain of 9.2 dBi. In addition, the isolation is higher than 18 dB although the close separation from edge to edge of the two antennas is only 2 mm and radiation efficiency of 73% at the operating frequency band. All is simulated based on CST Studio software and the simulated S-parameter results of the antenna are in good agreement with measurement results.
“…Besides, the bandwidth percentage and gain of this antenna are 8.8% and 4.3 dBi, respectively. Similarly, the antenna in [29] and [30], the isolation between antenna is only 15 dB, while the gains of antennas are very low (lesser than 2 dBi). Fig.…”
In this paper, a multiple input multiple output antenna which operates at 5.8 GHz for wireless local area network applications is proposed. The proposed antenna is composed of two sets of four elements antenna array (2 × 2) on the top and a novel metamaterial structure on the ground plane. Here, the ground plane, which includes a lattice of 2 × 5 unit cells of metamaterial structure, is utilized in order to improve parameters of the antenna. Thanks to the proposed metamaterial structure, not only gain and bandwidth of antenna are enhanced, but also mutual coupling is reduced. The final design, with an overall size of 137 × 77 × 3.048 mm3, resulted in a |S11| <−10 dB bandwidth of 1.78 GHz and a peak gain of 9.2 dBi. In addition, the isolation is higher than 18 dB although the close separation from edge to edge of the two antennas is only 2 mm and radiation efficiency of 73% at the operating frequency band. All is simulated based on CST Studio software and the simulated S-parameter results of the antenna are in good agreement with measurement results.
“…Among the salient features of a MIMO antenna, the most significant features that come to mind are increasing radio channel capacity, according to Shannon's law, and overcoming the phenomenon of Multipath Fading [4]. Recently, various MIMO antennas with diverse design techniques have been presented [5,6,7,8,9,10,11]. A 4×4 MIMO antenna is designed and provided for use in wearable biotelemetric devices in [5].…”
Section: Introductionmentioning
confidence: 99%
“…This antenna has a frequency bandwidth, isolation, and ECC of 2.4 GHz to 2.5 GHz, above 25 dB, and below 0.022, respectively. Other structures of MIMO antennas such as including MIMO antenna with monopole elements for LTE 2300 and 2.45 GHz ISM applications in [7], 4-element MIMO antenna for use in 2.45 GHz ISM band using Complementary Split-Ring Resonator (CSRR) elements in [8], using ground slots for 4G LTE and 3G applications to increase isolation between Planar Inverted-F Antenna (PIFA) elements in MIMO antenna in [9] and [10], using of Cylindrical Monopole elements and improving isolation by using Defected Ground Structures (DGS) for application in the frequency band 0.698 GHz to 0.960 GHz in [11], and a new design of a 4-element MIMO antenna for X-band applications can be noticed in [12]. In [12], a circular polarization (CP) operation is attained by using Tai Chi-shaped patches and L-shaped feeds.…”
“…This standard utilizes ISM frequency bands of 2.4 GHz or 5.8 GHz and is interoperable with 802.11b, and uses 802.11g-like modulation, but with MIMO. There have been various investigations on antenna design at the 2.4 GHz ISM band frequency as in [12][13][14][15][16][17][18].…”
A compact four-element multiple-input multiple output (MIMO) antenna is proposed for medical applications operating at a 2.4 GHz ISM band. The proposed MIMO design occupies an overall volume of 26 mm × 26 mm × 0.8 mm. This antenna exhibits a good impedance matching at the operating frequency of the ISM band, whose performance attributes include: isolation around 25 dB, envelope correlation coefficient (ECC) less than 0.02, average channel capacity loss (CCL) less than 0.3 bits/s/Hz and diversity gain (DG) of around 10 dB. The average peak realized gain of the four-element MIMO antenna is 2.4 dBi with more than 77 % radiation efficiency at the frequency of interest (ISM 2.4 GHz). The compact volume and adequate bandwidth, as well as the good achieved gain, make this antenna a strong candidate for bio-medical wearable applications.
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