Characterization and Performance of an Ultra-Wideband Wide-Coverage Multimode MIMO Antenna

Abstract

A new ultra-wideband multimode (MM) antenna design that enables the detection/transmission of two orthogonal field components over a nearly hemispherical coverage area is presented in this paper. It integrates and colocates two perpendicularly oriented bow-tie dipole elements, a short convex monopole and four horizontally oriented tapered slot antenna (TSA) elements (formed by the dipoles) in order to produce four decoupled and complementary gain patterns. The antenna feeding structure includes four single-ended transmission lines supporting the desired set of individual excitation modes. Experimental verification confirms the predicted negligible coupling between the antenna operating modes and orthogonality of the corresponding radiated field patterns. These unique features can be exploited in applications where pattern and polarization diversity are of importance. In this study, we have evaluated the proposed antenna as a MIMO base station antenna and characterized it in two different propagation scenarios. For this example, it has been shown that the utilization of the additional monopole and TSA modes plays an important role in maximizing MIMO efficiency in line-of-sight (LOS) scenarios and at the same time provides additional independent data streams in rich scattering scenarios. In both considered scenarios, the antenna is shown to have a MIMO frequency bandwidth of 85%.

Accelerated parameter tuning of antenna structures using inverse and feature‐based forward kriging surrogates

“…These include continuously increasing demands concerning antenna performance, both in terms of electrical and field characteristics 1,2 . Others are related to the need for implementing various functionalities, for example, multi‐band operation, 3 circular polarization, 4 band notches, 5 MIMO operation, 6,7 pattern and/or polarization diversity, 8 or tunability 9 . Additional requirement is maintaining small size, which is essential for many applications 10‐12 .…”

Simulation-Driven Antenna Modeling by Means of Response Features and Confined Domains of Reduced Dimensionality

“…Design of antennas for these applications requires maintaining small physical dimensions [7], [8], which makes the task even more challenging. From the utility perspective, contemporary antenna structures have to fulfill various demands, including multi-band or MIMO operation [9], [10], polarization/pattern diversity [11], [12] or harmonic suppression [13]. To implement such functionalities, antenna geometries are gradually becoming more and more complex, and, consequently, described by an increased number of parameters.…”

Cost‐efficient performance‐driven modelling of multi‐band antennas by variable‐fidelity electromagnetic simulations and customized space mapping

“…Stringent specifications imposed on modern antennas pertain to their electrical and field characteristics, maintaining a small footprint area, 1 or implementation of additional features: multi‐band or MIMO operation, 2 multi‐functionality, 3 circular polarization, 4 and band notches 5 . Many of these demands stem from emerging application areas (eg, internet of things, 6 5G, 7 wearable devices 8 ).…”