Tri-band MIMO Antenna for WLAN, WiMAX and Defence System & Radio Astronomy Applications

Abstract

In this paper, an efficacious and impermeable undeviating MIMO consisting of 70 x 50 x 0.4 mm 3 is used for WLAN, defence system & radio astronomy and WiMAX applications. In place of the technique of parasitic elements to abandon the reactive coupling connection between the antennas we have used an alternate technique where a neutralizing line is connected between the two symmetrical radiating elements. In this technique four small slits of small size are etched on to the ground plane to reduce isolation (mutual coupling) between the antennas. This has resulted in the proposed antenna producing a good bandwidth at the three resonant frequencies of (3.2-3.7 GHz) for Wireless LAN, (5.1-5.6 GHz) WiMAX and (6.7-7.5 GHz) defence system & radio astronomy applications with |S11|< -10 dB and mutual coupling |S12|< -20 dB for the entire operating band. The simulation results and measured results demonstrate that tri-band MIMO antenna is more acceptable for the design in portable device applications. IntroductionThe multiple-input-multiple-output (MIMO) antenna is a popular antenna in recent times to exchange the data and enhance the rate of data transmission without additional power requirement and spectrum. This MIMO antenna reduces the capacity of the channel transmission and multipath fading. [4][5][6]. The MIMO antenna system uses especially in Ultra Wide Band (UWB) system provide high data rate of channel capacity. It is also used for multipath fading giving better immunity in comparison to that of narrow-band systems [7]. In [8], a MIMO antenna with portable devices in UWB applications consists of a band-notched characteristic with an overall size of 80 × 75 mm 2 to reduce the isolation -35 dB in the resonating band of frequencies at 5.2 GHZ is used. Two metal strips that consists of λ/3 and λ/4 of length are used on the antenna in [9], Y-shaped MIMO antenna with defected ground structure for the applications design of UWB antenna in [10], Isolation enhancement with the help of two defected ground structures in [11], By inserting meandered feeding lines are arrange to placing in between the UWB MIMO antenna gets dual-polarised in [12], By inserting parasitic elements between the antennas to minimize the isolation effect for mobile terminal applications in [13]. Printed MIMO-antenna system is using neutralization-line technique was proposed for wireless USB-dongle applications in [14] with an overall size of 85 × 65 mm 2 with resonant frequency 2.4 GHz. The design of UWB MIMO antennas for portable devices, with band notch characteristics, high isolation and meander feeding lines was proposed in [15][16][17][18]. The design of compact MIMO antennas for enhances isolation, improving the isolation performance, MIMO parameters, dual polarization consists in USB dongle applications and metamaterial concepts proposed in [19][20][21][22][23]. A dual polarized ultra wideband Multiple-Input Multiple-Output antenna is divided by the two antenna elements which greatly minimize the overall dimension of the MIMO antenna...

Design & analysis of a dual-band MIMO antenna to reduce the mutual coupling

“…In literature, different types of design methods have been reported by the researchers for the design of the MIMO antenna [1]- [30] to address the mentioned issues. The design methods include four element closely spaced dual-band radiator [1], planar decoupling structure with higher isolation [2], Hilbert fractal slot [3], F-shaped stubs [4], E-Shaped MIMO Antenna with Matrix of C-Shaped Resonators [5], Multi-band minkowski structure [6], tree shaped ground plane [7], Uniplanar EBG structure [8], complementary split ring resonator [9], folded monopole [10], compact co radiator technique [11], quasi self-complementary structure [12], combination of half planar radiators and ground stub [13], SRR loaded monopole with slotted ground plane [14], parasitic decoupling structure [15], meandering monopole [16], quad elements [17], shared radiator with tapered microstrip feed line [18], CPW-Fed hexagonal ring monopole antenna [19], defected ground structure for enhanced isolation [20], asymmetrical feeding [21], inverted F-antennas [22], inverted L-monopole antenna with interconnected ground plane [23]. Researchers have also investigated printed compact MIMO antennas consisting of open L-shaped slot elements [24], wideband neutralization technique [25], carbon black film technologies [26], and meander line technique [27] to reduce the mutual coupling.…”

Analysis of Multi-Band Circle Mimo Antenna Design for C-Band Applications

“…In [23], it is observed that the performance evaluation of 5G communication having dual-mode & triple-band MIMO 10-antenna handset array antenna maintains ECC ≤ 0.05. A triband MIMO antenna [24] has a size of 40 × 35 mm 2 for WiMAX, radio astronomy and WLAN applications with reduced isolation (S 12 ) around −52 dB. In [25], a compact multi-band MIMO radiator improved the isolation parameter greatly.…”