Ultra‐compact dual‐polarised UWB MIMO antenna with meandered feeding lines

Abstract

An ultra‐compact dual‐polarised ultra‐wideband multi‐input multi‐output antenna made with a single‐shared‐radiating element and two meandered feeding lines are proposed. Miniaturisation is achieved by using a combination of techniques, including a resonant stub connected to the ground through which shorts the excessive coupled energy before it reaches the other port and minimises coupling, slots etched in the radiator that also help minimise mutual coupling, while the meandered lines allow to bring the antenna closer to the greatly reduce the overall size of the antenna. Slots etched in the radiator and the use of a stub connected to the ground through, help to minimise the mutual coupling. The formation of orthogonal surface currents provides the necessary dual polarisation. Simulated and measured results demonstrate the wideband impedance matching, low mutual coupling and low envelope correlation coefficient. This antenna has an extremely compact size (22 × 24.3 mm2, including the ground plane) that makes it an excellent candidate for portable and handheld devices.

Eight-Element Antenna Array at 3.5 GHZ for Mimo Wireless Application

“…Thus strong current excited by Ant1 flows via the ground plane to the CPW-fed port of the immediate neighboring Ant2. This process of mutual coupling of two orthogonal antennas was also reported in [12,13] with orthogonal antenna elements disposed at the corner edge of the PCB. Hence different antenna decoupling networks were employed for maximum isolation between two antennas.…”

Very Compact 5.5 GHZ Band-Notched Uwb-Mimo Antennas With High Isolation

“…The list is not comprehensive but fairly represents the current state of the art of this technology. Though the antenna size in [6] is smaller than the proposed antenna, the proposed antenna can achieve WLAN band rejection, and the antenna in [6] cannot. Besides, the ECC of the proposed antenna is better, and the isolation is also good enough.…”

“…UWB combined with multi-input multi-output (MIMO) technology should be a wonderful solution. Some MIMO antennas for UWB applications have been proposed in the past few years [3][4][5][6].…”

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

“…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].…”

“…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.…”