Dual-Layer Ebg Structures for Low-Profile ``Bent'' Monopole Antennas

Electromagnetic band gap (EBG) structures are usually realized by periodic arrangement of dielectric materials. These periodic structures can help in the reduction of mutual coupling in array antennas. In this paper a new arrangement of EBG structures is presented for reducing mutual coupling between patch antenna MIMO arrays. The patch antennas operate at 5.35 GHz which is defined for wireless application. Here 2 × 5 EBG structures are used to reduce mutual coupling more than 20 dB. The total size of the antenna is 36 mm × 68 mm × 1.6 mm. So it is more compact in than pervious research. Experimental results of return loss and antenna pattern have been presented for 5.4 GHz and compared with HFSS simulation results. Also the EBG structures have been designed with numerical modeling and dispersion diagram. New EBG model is compared with conventional EBG model, and equivalent circuit model is given for new structure.

Section: Ebg Modeling and Numerical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Ebg Structures for Reduction of Mutual Coupling in Patch Antenna Mimo Arrays

Naser‐Moghadasi¹,

Ahmadian²,

Mansouri³

et al. 2014

“…A major category of them includes hybrid systems composed of dipoles the operation of which is enhanced by EBG lattices positioned in close proximity to them. In accordance to the literature, hybrid 'antenna-EBG' structures would have gain and frequency bandwidth larger than that of simple antennas, specific radiation patterns regarding the space distribution of the radiated power, satisfactory Front-to Back Ratio, etc, and at the same time be miniaturized and of very low profile [1][2][3][4][5][6]. Additionally, attributes as polarization diversity, sufficient MEG and reduction of mutual coupling between the antenna array elements could be obtained, thus being attractive to modern applications [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 93%

A New Method of Driving Wire Dipole Antennas to Multiband Operation via Non-Uniform Ebg Lattices for Employment to Wireless Communication Applications

Mourtzios¹

2016

In this paper, a novel approach is attained to the design of low profile antenna structures with wire dipoles and multiband operation. The aim is achieved by utilization of non-uniform Electromagnetic Band Gap (EBG) lattices as reflectors, and this potential comes to be added to the total of special capabilities of this type of Artificial Magnetic Conductors (AMC). It is proved that a properly designed EBG of this type can resonate at more than one frequency and is capable to drive, inside these bands, the dipole to higher order modes of operation besides its basic one. The resulting hybrid radiator apart from its multiband operation exhibits high gain that reaches the value of 9.6 dB, satisfactory Mean Effective Gain (MEG) and very low correlation coefficients, much less than 0.1, between the signals at the input of the dipoles in the case that the radiator is configured as an antenna array. The study of these quantities was performed using the signal characteristics of a real mobile communication environment along with the hybrid antenna properties of operation. The presented analytical results show that the designed radiators are competitive to the classical microstrip ones and can be effectively used in modern wireless communication networks, incorporated either into stationary or into mobile units.

“…The authors in [22] achieved 22.7 dB isolation improvement using a fractal EBG structure among four patch antennas. In [23], the authors used a dual-layer EBG structure to increase the operating bandwidth of a sabre-type antenna around 1.4 GHz to 24.4%. Elliptical split ring resonators were used in [24] to improve isolation by 19 dB over 5.1-5.9 GHz.…”

Section: Introductionmentioning

confidence: 99%

Dual-Layer Dual-Patch Ebg Structure for Isolation Enhancement and Correlation Reduction in Mimo Antenna Arrays

Sokunbi¹,

Attia²

2020

This paper proposes a novel electromagnetic band gap (EBG) structure based on a duallayer dual-patch unit (DLDP-EBG) cell to improve isolation and decrease envelope correlation between MIMO slot antenna array elements. A wideband MIMO slot antenna array operating in the frequency range of 4.2-6.5 GHz (43%) is deployed. The antenna array is based on slotted rectangular microstrip radiating elements printed on the top surface of two stacked FR4 substrates to widen the array impedance bandwidth. A 2 × 7 dual-layer DLDP-EBG unit cell is inserted between the array elements to reduce the mutual coupling and deflect the individual beams of each antenna in opposite directions. An isolation improvement of up to 56 dB is maintained throughout the working bandwidth of the antenna, when the EBG is inserted. Also, the DLDP-EBG unit cells reduce the envelope correlation coefficient by 5-30 dB across the whole operating bandwidth by deflecting the radiation beams of the individual antenna elements in opposite directions. The MIMO array gain and radiation efficiency have been improved after using the EBG structure due to the reduction in mutual coupling and surface wave mitigation between the array elements. The proposed low-profile MIMO slot antenna array is the first in literature to exhibit such wideband isolation improvement, gain enhancement, and correlation reduction behavior simultaneously.