This paper presents a planar triple-band MIMO antenna that meets GSM900/1800 and LTE2600 bands protocols. The antenna element contains three individual meander-line type Inverted-L radiators; the highest frequency band radiator is fed by a transmission line while the other two utilize the proximity coupling feeding mechanism driven by the highest band radiator. The MIMO antenna is incorporated with two symmetric triple-band antenna elements and two physical decoupling devices. The two antenna elements are closely spaced with one-fifteenth wavelength of the lowest band. The two decoupling devices, a T-shape slot and a meandering microstrip-line resonator, are built for the highest and the lowest frequency bands respectively. Meanwhile, a negligible mutual coupling effect in middle band is achieved by using a collinear placed transverse meander-line pair in the MIMO antenna. The antenna prototype measurement results show good impedance matching with low mutual coupling effect. The calculated Envelope Correlation Coefficient verifies the suitability of the proposed antenna for mobile wireless access applications.
Nowadays everyone needs electronic gadgets in compact size, and single device should accomplish all the tasks. A compact MIMO antenna resonating at multi-band of frequencies is proposed in the current research work. The proposed MIMO antenna consists of two elements. The edge to edge separation between the two antennas is λ 0 /31 and still maintains low mutual coupling levels between the two antennas. The proposed MIMO antenna resonates at 4.75 GHz, 5.89 GHz, 6.74 GHz, 8.25 GHz and 9.82 GHz. The mutual coupling is reduced by −23.78 dB at 4.75 GHz, −25.71 dB at 5.89 GHz, −29 dB at 6.74 GHz, −32.79 dB at 8.25 GHz and −21.5 dB at 9.82 GHz, respectively. The performance of the proposed MIMO system was evaluated in terms of S-parameters, Envelope Correlation Coefficient (ECC), Voltage Standing Wave Ratio (VSWR), and Radiation Pattern. The measured and simulated results are presented.
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