Two-Port CPW-Fed Dual-Band MIMO Antenna for IEEE 802.11 a/b/g Applications

Abstract

A coplanar waveguide- (CPW-) fed dual-band multiple-input multiple-output (MIMO) antenna for 2.45/5.5 GHz wireless local area network (WLAN) applications is presented in this paper. The presented MIMO antenna consists of two identical trapezoidal radiating elements which are perpendicular to each other. The size of the entire MIMO antenna is 50 × 50 × 1.59 mm3, which is printed on a FR4 substrate. The measured impedance bandwidth of the proposed antenna is 2.25–3.15 GHz and 4.89–5.95 GHz, which can cover IEEE 802.11 a/b/g frequency bands. A rectangular microstrip stub is introduced to achieve a good isolation which is less than −15 dB in both operation frequency bands. The measured peak gain is 5.59 dBi at 2.45 GHz and 5.63 dBi at 5.5 GHz. The measured antenna efficiency is 77.8% and 80.4% in the lower and higher frequency bands, respectively. The ECC values at the lower and higher frequencies are lower than 0.003 and 0.01, respectively.

Mutual Coupling Reduction in Dual-Band MIMO Antenna Using Parasitic Dollar-Shaped Structure for Modern Wireless Communication

“…In light of these challenges, several MIMO antennas aiming to reduce mutual coupling among closely-deployed antenna radiators for wireless applications are suggested in [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], and [17]. The Ultra-wideband (UWB) antennas in [1] and [2] operating in the 4-12 GHz and 2.95-15.65 GHz bands, respectively, achieved high isolation using Quad G-shaped metamaterial and a parallel strip resonator.…”

“…These antennas have very narrow bandwidth and operate in a single band only. In order to accommodate the multiband and wideband two-port MIMO, other antennas have been investigated in [6], [7], and [8]. The inverted-F antenna in [6] uses an inverted T-shaped slot to improve isolation and operates in the 3.3-3.65 GHz and 4.8-5.50 GHz bands.…”

A Compact Dual-Band MIMO Antenna for Sub-6 GHz 5G Terminals

“…Additionally, defected ground structures (DGS) can improve isolation by affecting the circuit substrate's effective dielectric constant distribution-this has become a commonly used technology for overcoming undesired coupling in MIMO antenna designs [11][12][13][14]. Some MIMO antennas use unique decoupling structures to improve isolation, such as the multi-slot decoupling structure [15], the generic decoupling structure composed of an array of H-shaped parasitic structures [16], and the rectangular microstrip stub [17].…”

A MIMO Antenna with High Gain and Enhanced Isolation for WLAN Applications

“…However, this will inevitably lead to a large occupied area. Within the occupied area, many methods to minimize mutual coupling have been proposed, such as the employment of band gap structures [5], decoupling networks [6,7], neutralization lines [8], defected ground structures [9] and parasitic elements [10]. These technologies reduce the coupling by minimizing, attenuating and blocking the surface currents [11].…”