Multi element antenna systems for diversity and MIMO terminal devices (original) (raw)
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Four-element printed monopole antenna systems for diversity and MIMO terminal devices
17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003., 2003
Four-element antenna diversity systems suitable for operation in diversity and MIMO wireless devices for single (2.4 or 5.2 GHz) and dual band operation are addressed. The antenna elements used are the Minkowski, the Inverted F and the Koch monopole. The calculated envelope cross correlation and mean effective gain of the antennas satisfy the criteria for achieving good diversity performance. The impact of the mutual coupling between the antenna elements on their radiation efficiency and mean effective gain is also addressed indicating that the type of the antennas, their placement and their electrical distance are key parameters in the design of an efficient multi element antenna system.
Diversity and MIMO performance evaluation of compact multi element antennas with common phase center
2007 19th International Conference on Applied Electromagnetics and Communications, 2007
The diversity and Multiple Input Multiple Output (MIMO) performance provided by common phase center multi element antenna (CPCMEA) systems is evaluated using two practical methods which make use of the realized active element antenna patterns. These patterns include both the impact of the mutual coupling and the mismatch power loss at antenna ports. As a case study, two and four printed Inverted F Antenna (IFA)
IEEE Open Journal of Antennas and Propagation, 2020
An eight element, compact Ultra Wideband− Multiple Input Multiple Output (UWB-MIMO) antenna capable of providing high data rates for future Fifth Generation (5G) terminal equipments along with the provision of necessary bandwidth for Third Generation (3G) and Fourth Generation (4G) communications that accomplishes band rejection from 4.85 to 6.35 GHz by deploying a Inductor Capacitor (LC) stub on the ground plane is presented. The incorporated stub also provides flexibility to reject any selected band as well as bandwidth control. The orthogonal placement of the printed monopoles permits polarization diversity and provides high isolation. In the proposed eight element UWB-MIMO/diversity antenna, monopole pair 3−4 are 180 • mirrored transform of monopole pair 1−2 which lie on the opposite corners of a planar 50 × 50 mm 2 substrate. Four additional monopoles are then placed perpendicularly to the same board leading to a total size of 50 × 50 × 25 mm 3 only. The simulated results are validated by comparing the measurements of a fabricated prototype. It was concluded that the design meets the target specifications over the entire bandwidth of 2 to 12 GHz with a reflection coefficient better than −10 dB (except the rejected band), isolation more than 17 dB, low envelope correlation, low gain variation, stable radiation pattern, and strong rejection of the signals in the Wireless Local Area Network (WLAN) band. Overall, compact and reduced complexity of the proposed eight element architecture, strengthens its practical viability for the diversity applications in future 5G terminal equipments amongst other MIMO antennas designs present in the literature.
Design of a Novel Antenna Array for MIMO Applications
2008 3rd International Conference on Information and Communication Technologies: From Theory to Applications, 2008
In spite of the good benefits of using MIMO technology with modern wireless systems, a major problem has arisen from using it with small wireless terminals. When antennas are placed with less than half wavelength apart then mutual coupling occurs. Researchers have found that mutual coupling can affect the performance achieved by multiple antennas which results in a large reduction in channel capacity. In this paper a practical hybrid circuit is designed for a 2x2 MIMO system to confirm a recent theory which states that a decorrelation network can be used with mutually coupled MIMO antennas to improve the performance. The hybrid circuit was tested with stacked patch antennas and performance was evaluated using Cumulative Distribution Function curves on channel capacity at 5.2 GHz. Results show that some improvement was achieved with the hybrid and results can be further improved by some other manipulations.
Micromachines
A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation and low channel capacity loss. The MIMO antenna was designed and optimized to cover the dual-frequency bands; the first frequency band is a wide band, and it covers the frequency range of 1550–2650 MHz, while the other frequency band covers the 3350–3650 MHz range. The measured wide-band impedance bandwidths of 1.1 GHz and 300 MHz were achieved in the lower and upper frequency bands, respectively. The proposed structure consists of four novel antenna elements, along with a plus-sign-shaped ground structure on an FR4 substrate. The overall electrical size of the whole dual-band MIMO antenna system is 0.3λ(W) × 0.3λ(L) × 0.008λ(H) for the lower frequency band. It achieved greater than 10 and 19 dB isolation in the lower and upper frequency bands, respectively. The antenna system accomplished an envelope correlation coefficient of |ρ|≤0.08 in the lower frequen...
Progress In Electromagnetics Research C
This paper presents a forthcoming compact high-performance two-element multiple-inputmultiple-output (MIMO) diverse antenna for wireless-LAN 5 GHz band and sub-6 GHz 5G (NR) band. The proposed antenna consists of two symmetrical antenna elements with an inverted T-shaped ground structure. The antenna attributes such as S-parameters, realized gain, current distribution, and radiation patterns are studied. Additionally, MIMO performance is also investigated in terms of envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and multiplexing efficiency. The antenna covers the entire 5G band for wireless communication, with an effective band (−10-dB) of 2.92 to 5.72 GHz (provides bandwidth of 2.8 GHz). The obtained values indicate that the measured performance is in reasonable agreement with simulated one. Additionally, efficiency and gain were around 95% and above 3 dB across the band of interest, respectively.
A compact four-element diversity-antenna array for PDA terminals in a MIMO system
Microwave and Optical Technology Letters, 2005
A four-element diversity-antenna array using four dielectric-loaded folded-loop antennas in a personal digital assistant (PDA) terminal operating at 5.2 GHz for the multiple-input multiple-output (MIMO) application is introduced. The S-parameters and the radiation patterns of the antennas are assessed using a finite-integration technique (FIT) simulation and experimental measurements. The diversity performance is also evaluated by calculating the envelope-correlation coefficients and the mean effective gain (MEG) of the antennas.
International Journal of Antennas and Propagation
This paper presents a compact Multiple Input Multiple Output antenna with high isolation and low envelope correlation (ECC) for fifth-generation applications using spatial diversity technique. The proposed MIMO antenna consists of two single antennas, each having size of 13 × 12.8 mm2, symmetrically arranged next to each other. The single and MIMO antennas are simulated and analyzed. To verify the simulated results, the prototype antennas were fabricated and measured. A good agreement between measurements and simulations is obtained. The proposed antenna covers the 28 GHz band (27.5–28.35 GHz) allocated by the FCC for 5G applications. Moreover, the isolation is more than 35 dB and the ECC is less than 0.0004 at the operating band, which means that the mutual coupling between the two elements is negligible. The MIMO parameters, such as diversity gain (DG), total active reflection coefficient (TARC), realized gain, and efficiency, are also studied. Thus, the results demonstrate that o...
Diversity and MIMO Performance Evaluation of Common Phase Center Multi Element Antenna Systems
The diversity and Multiple Input Multiple Output (MIMO) performance provided by compact multi element antennas (MEA) with common phase center is evaluated using two practical methods which make use of the realized active element antenna patterns, including thus both mutual coupling and mismatch at antenna ports. As a case study, two and four printed Inverted F Antenna (IFA) systems are evaluated in terms of Effective Diversity Gain (EDG) and Capacity (C). The concept of receive antenna selection is also investigated and the simulation results show a 43% improvement in the 1% outage C of a reconfigurable 2x2 MIMO system over a fixed 2x2 one.
Multiport Single Element Mimo Antenna Systems: A Review
Sensors
In response to the increasing demand for voice, data, and multimedia applications, the next generation of wireless communication systems is projected to provide faster data rates and better service quality to customers. Techniques such as Multiple-Input–Multiple-Output (MIMO) and diversity are being studied and implemented to meet the needs of next-generation wireless communication systems. Embedding multiple antennas into the same antenna system is seen as a promising solution, which can improve both the system’s channel capacity and the communication link’s quality. However, for small handheld and portable devices, embedding many antennas into a single device in a small area and at the same time providing good isolation becomes a challenge. Hence, designing a shared antenna system with multiple feed ports with equivalent or better performance characteristics as compared to the approach of multiple antennas with multiple feed ports is a promising advantage which can reduce the size...