Premium
A triangular MIMO array antenna with a double negative metamaterial superstrate to enhance bandwidth and gain
Author(s) -
Ojo Rasheed,
Jamlos Mohd Faizal,
Soh Ping Jack,
Jamlos Mohd Aminudin,
Bahari Norfatihah,
Lee Yeng Seng,
AlBawri Samir Salem,
Abdul Karim Mohamad Shaiful,
Khairi Khairil Anuar
Publication year - 2020
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22320
Subject(s) - bandwidth (computing) , metamaterial , mimo , physics , antenna efficiency , optoelectronics , electronic engineering , computer science , dipole antenna , antenna (radio) , telecommunications , engineering , beamforming
Abstract Multiple‐input‐multiple‐output (MIMO) array antenna integrated with the double negative metamaterial superstrate is presented. The triangular metamaterial unit cell is designed by combining two triangular elements positioned in complementary on the same plane at different sizes. Such design with more gaps is used to excite rooms for more capacitance effects to shift the resonance frequency thus enlarging the bandwidth of the MIMO antenna. The unit cell is arranged in 7 × 7 periodic array created a superstrate metamaterial plane where the C stray exists in parallel between the two consecutive cells. It is found that the existence of C stray and gaps for each unit cells significantly influenced the bandwidth of the MIMO antenna. The higher value of the capacitance will lead to the negativity of permittivity. The superstrate plane is then located on top of the 4 × 2 MIMO with a gap of 5 mm. The integration resulted in improving the bandwidth to 12.45% (5.65‐6.4GHz) compared to only 3.49% bandwidth (5.91‐6.12GHz) of the MIMO antenna itself. Moreover, the negative permeability characteristic is created by a strong magnetic field between the complementary unit cells to have 14.05‐dBi peak gain. Besides that, the proposed antenna managed to minimize the mutual coupling and improve the mean effective gain, envelope correlation coefficient, and multiplexing efficiency.