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Recently, MIMO (Multiple-Input Multiple-Output) technology is introduced in various small wireless applications. If MIMO antennas are mounted on such terminals, a strong mutual coupling is occurred because a distance between antenna elements is close. To solve this problem, a decoupling method for 2×2 MIMO connecting between two antenna elements by inductors has been developed. However in this method,...
A dual-band MIMO antenna is designed for automotive-based LTE communication. Basically, a monopole antenna is modified to resonate at a 900-MHz LTE band and a 1.9-GHz area, and to occupy a small real estate. Due to the dual-band resonance and radiation as one physical body, when this antenna is extended to the MIMO structure, the overall volume is relatively small to fit the space under the navigation...
A miniaturized multilayer internally multiple-input multiple-output (MIMO) printed antenna system combined with hybrid decoupling elements to improve isolation between two antennas at triple Long-Term Evolution (LTE) bands is presented in this paper. To reduce the single antenna size, the meander lines are stretched perpendicularly on the two respective layers that its overall dimensions are 14 ×...
A tripolarization rectangle dielectric resonator antenna (DRA) is presented in this paper. Three ports are used to excite TEδ11, TE1δ1 and quasi-TM01δ modes similar to cylindrical DRA. Two modes of TEδ11 and TE1δ1 give two orthogonal horizontal polarizations with broadside radiation patterns, and quasi-TM01δ mode obtains vertical omnidirectional radiation pattern. The isolations among the three ports...
The channel capacity characteristics of different multiple input multiple output (MIMO) systems are investigated. Both statistical and deterministic channel models for outdoor and indoor wireless communications are studied. Practical two-element compact monopole arrays with decoupling networks are utilized for the evaluation. For the deterministic model, a ray tracing tool is deployed to track the...
This paper presents two MIMO antennas for 2G, 3G and 4G cellular handsets. Each antenna is meandered to form a loop structure for achieving resonance at 0.25λ and 0.5λ. The substrate used for the design is FR-4 with relative permittivity of 4.35 and loss tangent of 0.02. The overall size of the substrate is 70 × 107.5 × 0.8 mm3 with each antenna occupying an area of 50 × 10 mm2. The decoupling structure...
Recently, there has been considerable interest in applying the Characteristic Mode (CM) approach to the design and synthesis of patterns of multiple antennas located on platforms such as automobiles and mobile terminals. In the CM approach, various modes of the currents and their contributions to the total radiated power are found, and the locations of current maxima are identified. In this work we...
Two tri-polarized loop antennas (TPL) are designed, one is with high mutual coupling (HCTPL) and the other is with comparatively low mutual coupling (LCTPL). The spatial distribution pattern (SDP) and cumulative distribution function (CDF) of the channel capacity gain (CG) of the proposed antennas are investigated and compared to that of the ideal TPL in the free space (FS) and the two-mirror (TM)...
In this paper, a mobile terminal LTE MIMO antennas is proposed. The proposed antenna can cover for the LTE band 14 of 760–800 MHz with the mutual coupling lower than −10 dB. Within the operating band, the envelope correlation coefficient and total efficiency are lower than 0.4 and higher than 40%, respectively. To verify the simulations, a prototype of the proposed antenna are fabricated and measured...
A triple-band multibeam multiple-input multiple-output (MIMO) antenna is investigated for access points (APs). The triple-band antenna covers 2.4–2.5, 3.4–3.7, and 5.1–5.9 GHz frequency bands with high gains and directional radiation patterns for WLAN/WiMAX applications. The MIMO antenna consists of four triple-band antenna elements rotated around a circle for space and polarization diversities. The...
In this paper, a 5G MIMO mobile phone prototype including four antennas working in the 10–13.2 GHz band is designed. The objective of the study is to evaluate the negative impact due to the user's hand in frequencies higher than 10 GHz. A 3D spherical near-field scanner with fixed Antenna Under Test (AUT) is leveraged in order to measure a 3D radiation pattern with a real human hand impact. S-parameters,...
Autonomous cars will in a near future drive around in cities and on highways. Antennas will then be needed to secure the wireless connection to these cars. To be able to test the antennas we have defined two edge environments: the Random Line-of-Sight (LOS) and the Rich Isotropic Multipath (RIMP). This paper shows a throughput performance comparison between measurements and simulations of a car-roof...
This paper presents a 2 × 2 multiple-input-multiple-output over-the-air (MIMO OTA) measurement system with user-programmable, reconfigurable and real-time signal processing field-programmable gate arrays (FPGAs)-based software-defined radio (SDR) capability. Signal generation and analysis as well as channel emulation are all implemented using vector signal transceivers (VSTs). As a demonstration,...
The multiplexing efficiency of 4×4 higher order MIMO with different MIMO topologies under different propagation scenarios in a mobile terminal is presented in this study. The mean effective gain, correlation coefficient and multiplexing efficiency of different MIMO topologies are compared and the impact from the angular spread of the incoming wave is also studied. The results are instructive for the...
This paper presents a wideband miniaturized Vivaldi antenna with two excitation ports to create broadside and omnidirectional radiation patterns. The antenna is based on two Vivaldi monopoles implemented perpendicularly to a conductive ground plane, and oriented in opposite directions of the vertical symmetry axis. By exciting the ports in- and out- of phase, two orthogonal radiating modes can be...
In this paper, we propose a linear array configuration for Random Line-of-Sight Over-The-Air testing set-up in anechoic chamber. For this aim, we use the self-grounded dual-polarized bowtie antenna as the element in the array. We present a new design of the bowtie to improve the array performance in terms of reflection coefficient and directivity. The new design has a simpler profile to manufacture...
A T-shape open-slot antenna with a narrow ground clearance of 1.5 mm and a length of 76 mm along the side edge of the LTE smartphone is presented. This study applies the narrow region between the display panel and the casing of the smartphone to accommodate the LTE antenna. With the narrow ground clearance, the antenna can provide two operating bands of 746∼960 MHz and 1710∼2200 MHz to cover the LTE...
In this paper, we develop a multiple-input-multiple-output (MIMO) Wi-Fi antenna for mobile application. The MIMO antenna system consists of two monopoles of meander-line structure. The separation between two antenna elements is 20 mm which is approximately 0.33λ0 at 5 GHz. Two U-shaped slots are used to produce defective ground structure (DGSs) to reduce the mutual coupling between two monopoles....
Overlay cognitive radio is described in this paper. Channel activity is endlessly guide by the Wide band sensing antenna and a reconfigurable filtenna need to change the performing frequency. MIMO antenna system is considered to reduce multipath fading and to improve channel capacity. MIMO reconfigurable filtenna is designed and simulated using HFSS software. Sensing antenna covers the frequency range...
This paper presents a compact on-chip MIMO antenna design. The proposed structure consists of one folded monopole antenna operating as main antenna and one IFA antenna serving as the diversity antenna. Antenna ground is formed by connecting the idle space in the pad ring area with the ground pads and the ground plane of the circuit. The proposed antenna is fabricated with standard CMOS process. Measurement...
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