Figure - available from: Wireless Personal Communications
This content is subject to copyright. Terms and conditions apply.
Source publication
In this work, two elements and four elements compact UWB MIMO antennas are designed and fabricated. A printed circular disc with five circular slots is selected in this work due to its UWB performance and compact size for the MIMO antenna system. CST software is used in the simulation process. Measured S parameters show that the MIMO antennas work...
Similar publications
A small, orthogonally polarized, ultra-wideband (UWB), four-port multiple-input multiple-output (MIMO) printed antenna is presented in this study. The envisioned antenna is built up of four microstrip fractal-based circular patch elements, each of which is fed by a microstrip line with a 50-ohm impedance. The use of a defective ground plane allows...
In this paper a compact Multiple-Input Multiple-Output (MIMO) antenna has been proposed for ultra-wideband (UWB) applications. Proposed MIMO antenna has been designed based on a Printed Rectangular Monopole Antenna (PRMA) and two MIMO antennas. Proposed MIMO antenna satisfies the UWB design specifications such as reflection coefficient, transmissio...
This article demonstrates a compact wideband four-port multiple-input-multiple-output (MIMO) antenna system integrated with a wideband metamaterial (MM) to reach high gain for sub-6 GHz new radio (NR) 5G communication. The four antennas of the proposed MIMO system are orthogonally positioned to the adjacent antennas with a short interelement edge-t...
In this communication, a dual port printed multi‐input and multi‐output (MIMO) antenna with high isolation of dimension 12 × 8.5 × 0.8 mm³ is designed, analyzed, and investigated for 28‐GHz 5G mm‐wave applications. The metasurface layer is suspended over the MIMO antenna to convert the linearly polarized (LP) wave to a circularly polarized (CP) wav...
Citations
... Therefore, MIMO antenna configuration should consist of more number of antenna elements. Several four elements UWB MIMO antenna configurations have been reported in literature in this regard [16][17][18][19][20][21][22][23]. Four fractal antenna elements are placed orthogonal to each other along with grounded stubs for isolation improvement in [16]. ...
... Another orthogonally placed nonagonal shaped four port UWB MIMO antenna configuration with better isolation is presented in [22]. In [23], four antenna elements of the UWB-MIMO antenna configuration are placed in side by side and upside down configuration with one circular ring and two cross-shaped metallic barrier are used as decoupling structure. ...
... ECC of the proposed UWB MIMO antenna configuration Diversity Gain (DG) is another figure of merit for UWB MIMO antenna configuration which signifies the improvement in signal to interference ratio because of diversity schemes. It can be expressed as [23] = 10√1 − | | 2 ...
In this article, a compact planar four port Multiple-Input-Multiple-Output (MIMO) antenna configuration with an electrical dimension of 0.44λ × 0.44λ has been presented for Ultra wideband (UWB) operation and other wireless communication services. The proposed MIMO antenna consists of four identical microstrip line fed octagonal shaped patch antenna which are placed orthogonally to each other. In order to obtain required impedance bandwidth and desired isolation between antenna elements, modifications are made on ground plane and a circular metallic stub is inserted at the center of substrate. All the identical antenna elements operate from 2.62GHz to 20GHz covering the entire frequency band allotted to UWB operation. The isolation between different antenna elements is also obtained more than 15dB for the entire frequency range of impedance bandwidth. The proposed design also exhibits suitable radiation pattern with sufficient amount of gain. Different diversity performance parameters of the proposed design are observed to be within accepted limit. The time domain performance of the proposed design is also analysed in terms of group delay which further confirms the application of the proposed design as a UWB MIMO antenna configuration.
... Mean effective gain (MEG) is related to the receiving capabilities of the MIMO and can be defined as the ratio of the average power received by one of the ports to the average power received by a reference antenna, i.e. an isotropic antenna (Ahmed, 2023;Fakharian et al., 2022). As the name suggests, total active reflection coefficient (TARC) refers to the reflection coefficient of the entire structure (Armghan et al., 2023;Kumar, 2021). ...
Purpose
The purpose of this study is to design a radio altimeter antenna whose production process is facilitated and can work with multiple-input multiple-output (MIMO) properties to provide space gain on the aircraft.
Design/methodology/approach
To create an easy-to-produce MIMO, a two-storied structure consisting of a reflector and a top antenna was designed. The dimensions of the reflector were prevented to get smaller to supply easy production. The unit cell nearly with the same dimensions of a lower frequency was protected through the original cell design. The co-planar structure with the use of a via connection was modified and a structure was achieved with no need to via for easy production, too. Finally, the antennas were placed side by side and the distance between them was optimized to achieve a MIMO operation.
Findings
As a result, an easy-to-produce, compact and successful radio altimeter antenna was obtained with high antenna parameters such as 10.14 dBi gain and 10.55 dBi directivity, and the conical pattern along with proper MIMO features, through original reflector surface and top antenna system.
Originality/value
Since radio altimeter antennas require high radiation properties, the microstrip antenna structure is generally used in literature. This paper contributes by presenting the radio altimeter application with antenna-reflective structure participation. The technical solutions were developed during the design, focusing on an easy manufacturing process for both the reflective surface and the upper antenna. Also, the combination of International Telecommunication Union’s recommended features that require high antenna properties was achieved, which is challenging to reach. In addition, by operating the antenna as a successful MIMO, two goals of easy production and space gain on aircraft have been attained at the same time.
... The radiative efficiency of the antenna can be denoted as [19]: The total efficiency is thus; ...
This research work presents a compact six-port Multiple-Input Multiple-Output (MIMO) antenna that operates in the whole license-free Ultra-Wideband (UWB) spectrum of 3.1-10.6 GHz. The arrangement of the six antennas is near allowing for spatial diversity. The antenna elements are conventional rectangular patch UWB antennas. The major problems with antennas which are poor impedance, poor Voltage Standing Wave Ratios (VSWR), high mutual coupling and poor radiation efficiency were considered and resolved in this novel MIMO antenna. The antenna was designed using the microstrip patch method in a Computer Simulation Technology (CST) environment. CST was also used to design the antenna substrates and conduct all simulations. The antenna's ground plane used is FR-4 for the substrate design and copper is the patch antenna material. The antenna is 30mm x 25mm x 0.3mm in size with a 50-impedance feedline. The antenna's performance characteristics were analyzed, and the S-parameters illustrated a wide frequency response between 3.1-10GHz. The entire system loses lesser power than the absorbed power which makes this system very reliable with a radiation efficiency of less than-1dB (68%) across the frequency band. The VSWR of the antenna is less than 2 and greater than 1 allowing the system to have a positive maximum reflection. This design is therefore suitable for telecommunication systems requiring high speed and better signal transmission.
