UWB MIMO antenna implemented with orthogonal quasi‐circular slot dipole radiators

Abstract

In this paper, a very low‐profile two‐port ultra‐wideband antenna for multiple input‐multiple output applications is proposed. The antenna is implemented by using two orthogonal quasi‐circular slot dipole radiators fed by coaxial lines. The antenna performs from 2 to 10 GHz, with an average peak‐gain of 4 dB, and high port isolation, with values around S21 = −20 dB and below. The radiation patterns of both antennas are opposite to each other and hence, the diversity gain reaches values around 20 dB. The low inter‐port coupling and low correlation are verified by obtaining the envelope correlation coefficient, which is lower than 0.003. These calculations were made by the S‐parameter and far‐field methods. The total active reflection coefficient shows that the antenna operative bandwidth does not change for different input signals with random phases, preserving the operation from 2 to 10 GHz. The antenna performance is compared to different state of the art slot configurations, showing advantages to previously published work.

Compact four-port vertically polarized UWB monopole antenna for MIMO communications

“…The antenna covers the entire UWB spectrum, and it can be housed inside the shark fin housing. The size of the unit cell antenna (12 Â 17 mm) is smaller compared to most of the antennas reported in the literature Gulam Nabi Alsath and Kanagasabai, 2016;Arun et al, 2014;Wang et al, 2020;Zhang et al, 2015;Zhang and Pedersen, 2016;Mathur and Dwari, 2019;Biswal and Das, 2018;Sipal et al, 2018;Liu et al, 2014;Mathur and Dwari, 2018;Gurjar et al, 2019;Tripathi et al, 2015;Sampath and Selvan, 2020;Tirado-Méndez et al, 2019;Tiwari et al, 2019).…”

“…As the antenna array has a vertical geometry, the antenna radiation and impedance characteristics will not be affected by the vehicle's body unlike most of the solutions Gulam Nabi Alsath and Kanagasabai, 2016;Arun et al, 2014;Wang et al, 2020;Zhang et al, 2015;Zhang and Pedersen, 2016;Mathur and Dwari, 2019;Biswal and Das, 2018;Sipal et al, 2018;Liu et al, 2014;Mathur and Dwari, 2018;Gurjar et al, 2019;Tripathi et al, 2015;Sampath and Selvan, 2020;Tirado-Méndez et al, 2019;Tiwari et al, 2019;Patra and Das, Figure 15 Cumulative distribution function of the four-element antenna array The spacing between the antenna elements is small compared to (Arun et al, 2014;Wang et al, 2020;Zhang et al, 2015;Zhang and Pedersen, 2016;Mathur and Dwari, 2019;Biswal and Das, 2018;Sipal et al, 2018;Liu et al, 2014;Mathur and Dwari, 2018;Gurjar et al, 2019;Tripathi et al, 2015;Sampath and Selvan, 2020;Tirado-Méndez et al, 2019;Tiwari et al, 2019 andRaheja et al, 2019). Thus, more number of elements are tightly packed within a small space.…”

“…The antennas reported Gulam Nabi Alsath and Kanagasabai, 2016;Arun et al, 2014;Wang et al, 2020;Zhang et al, 2015;Zhang and Pedersen, 2016;Mathur and Dwari, 2019;Biswal and Das, 2018;Sipal et al, 2018;Liu et al, 2014;Mathur and Dwari, 2018;Gurjar et al, 2019;Tripathi et al, 2015;Sampath and Selvan, 2020;Tirado-Méndez et al, 2019;Tiwari et al, 2019;Patra and Das, 2020;Raheja et al, 2019;Prabhu and Malarvizhi, 2019) share a common PCB and the radiation property of one antenna will severely affect the property of the other. However, this problem is eliminated in the proposed solution where four elements are packed together in two different PCBs that are orthogonally interlocked.…”

“…Fractal-based UWB antennas (Tripathi et al, 2015;Sampath and Selvan, 2020) are also reported in the literature for MIMO implementation. A lowprofile two-element MIMO dipole antenna is presented in Tirado-Méndez et al (2019) with an average peak gain of 4 dB. The research in Tiwari et al (2019) reports a 2 Â 2 MIMO antenna with a neutralizing line to enhance the isolation between the antenna elements.…”

On the Design and Analysis of Compact Super-Wideband Quad Element Chiral MIMO Array for High Data Rate Applications

“…The performance of the proposed array under the diversity scenario was evaluated using the ECC. The ECC gave information about the amount of coupling between the antennas [45]. The envelope correlation coefficient was evaluated from the far field and is represented by Equation (3):…”