scholarly journals Reconfigurable 3-D Slot Antenna Design for 4G and Sub-6G Smartphones with Metallic Casing

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 216 ◽  
Author(s):  
Peng Yang
Keyword(s):  
State Of The Art ◽  
Three Dimensional ◽  
Smartphone Application ◽  
Long Term Evolution ◽  
Antenna Design ◽  
Slot Antenna ◽  
Pin Diodes ◽  
Design Processes ◽  
Term Evolution

The design of a reconfigurable three-dimensional (3-D) slot antenna for 4G and sub-6G smartphone application is presented in this paper. The antenna is located at the bottom of the smartphone and integrated with a metallic casing. Positive-Intrinsic-Negative (PIN) diodes are loaded at the dual-open slot and the folded U-shaped slot, respectively, which are used to realize four working states. The antenna has a compact volume of 42 × 6 × 6 mm3, which can cover the long term evolution (LTE) bands of 698–960 MHz and 1710–2690 MHz, and the sub-6G bands of 3300–3600 MHz & 4800–5000 MHz. The design processes are presented and the structure is optimized, fabricated and measured. The comparison to other state-of-the-art antennas shows that the proposed design has multiband characteristics with small size.

scholarly journals "A survey on the most important internet of things technologies "

2019 ◽  
Vol 6 (2) ◽  
pp. 1-12
Author(s):  
Gesoon j.k Al-Abass ◽  
Huda R. ALkifaey
Keyword(s):  
Cloud Computing ◽  
Internet Of Things ◽  
Recent Work ◽  
State Of The Art ◽  
Long Term Evolution ◽  
Network Layers ◽  
Term Evolution ◽  
Domain Importance ◽  
The World

"Internet of things (IoT) domain targets human with smart resolutions through the connection of “M2M” in all over the world, effectively. It was difficult to ignore domain importance field of IoT with the new deployment of applications such as smartphone in recent days. The most important layer in architecture of IoT is network layer, because of various systems (perform of cloud computing, switching, hub, gateway, so on), different technologies of connection (Long-Term Evolution (LTE), WIFI, Bluetooth, etc.) gathered in layer. Network layers should transfer the information from or to various applications/objects, via gateways/interfaces between networks that are heterogeneous, therefore utilizing different connection technologies, protocols. Recent work highlighted IoT technologies state-of-the-art utilized in architectures of IoT, some variations among them in addition to the applications of them in life."

scholarly journals Photonic Antenna Design for Long Term Evolution Application

2020 ◽  
Vol 881 ◽  
pp. 012147
Author(s):  
Hussein Ali Abdualnabi ◽  
Yasin Yousif Al-Aboosi ◽  
Adheed Hasan Sallomi
Keyword(s):  
Long Term Evolution ◽  
Antenna Design ◽  
Term Evolution

Long-term evolution of the three-dimensional structure of string-fluid complex plasmas in the PK-4 experiment

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
S. Mitic ◽  
M. Y. Pustylnik ◽  
D. Erdle ◽  
A. M. Lipaev ◽  
A. D. Usachev ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Long Term Evolution ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Term Evolution ◽  
Complex Plasmas

Evaluation of Long Term Evolution Cellular Network Performance when Transmitting Multi-view Video Content

2014 ◽  
Vol 3 (3) ◽  
pp. 16-32
Author(s):  
Carl James Debono ◽  
Gloria-Anne Ellul
Keyword(s):  
Video Coding ◽  
Video Transmission ◽  
Network Performance ◽  
High Efficiency ◽  
Three Dimensional ◽  
Long Term Evolution ◽  
3D Video ◽  
High Efficiency Video Coding ◽  
Term Evolution

The Long Term Evolution (LTE) cellular technology provides higher data rates than its predecessor technologies. This advancement paves the way for more data services, including improved multimedia services. Three-dimensional (3D) video transmission is one such service that can benefit from LTE deployment. For a positive uptake of 3D video transmission, the network must provide a good Quality of Service (QoS). In this paper the authors evaluate the LTE network's performance when transmitting Multi-view Video Coding (MVC) using simulcast and inter-view prediction coding. Furthermore, the authors evaluate the system using both the H.264/AVC (Advanced Video Coding) and the more recent High Efficiency Video Coding (HEVC) and their MVC extensions. Results show that, in an urban environment, LTE can accommodate a maximum of 93 users per cell, with adequate QoS, when transmitting 3D HEVC video at Common Intermediate Format (CIF) resolution. Moreover, cross-layer techniques can be used to reduce the QoS degradation as the user moves away from the eNodeB by transmitting lower resolution video.

scholarly journals Investigating dynamical properties of evolved Galactic open clusters

2019 ◽  
Vol 624 ◽  
pp. A8 ◽  
Author(s):  
M. S. Angelo ◽  
J. F. C. Santos ◽  
W. J. B. Corradi ◽  
F. F. S. Maia
Keyword(s):  
Open Cluster ◽  
Three Dimensional ◽  
Dynamical Evolution ◽  
Long Term Evolution ◽  
Open Clusters ◽  
Evolutionary Stage ◽  
Proper Motions ◽  
Stellar Content ◽  
Term Evolution

Context. The stellar content of Galactic open clusters is gradually depleted during their evolution as a result of internal relaxation and external interactions. The final residues of the long-term evolution of open clusters are called open cluster remnants. These are sparsely populated structures that can barely be distinguished from the field. Aims. We aimed to characterise and compare the dynamical states of a set of 16 objects catalogued as remnants or remnant candidates. We employed parameters that are intimately associated with the dynamical evolution: age, limiting radius, stellar mass, and velocity dispersion. The sample also includes 7 objects that are catalogued as dynamically evolved open clusters for comparison purposes. Methods. We used photometric data from the 2MASS catalogue, proper motions and parallaxes from the Gaia DR2 catalogue, and a decontamination algorithm that was applied to the three-dimensional astrometric space of proper motions and parallaxes (μα, μδ, ϖ) for stars in the objects’ areas. The luminosity and mass functions and total masses for most open cluster remnants are derived here for the first time. Our analysis used predictions of N-body simulations to estimate the initial number of stars of the remnants from their dissolution timescales. Results. The investigated open cluster remnants present masses (M) and velocity dispersions (σv) within well-defined ranges: M between ∼10−40 M⊙ and σv between ∼1−7 km s−1. Some objects in the remnant sample have a limiting radius Rlim ≲ 2 pc, which means that they are more compact than the investigated open clusters; other remnants have Rlim between ∼2−7 pc, which is comparable to the open clusters. We suggest that cluster NGC 2180 (previously classified as an open cluster) is entering a remnant evolutionary stage. In general, our clusters show signals of depletion of low-mass stars. This confirms their dynamically evolved states. Conclusions. We conclude that the open cluster remnants we studied are in fact remnants of initially very populous open clusters (N0 ∼ 103−104 stars). The outcome of the long-term evolution is to bring the final residues of the open clusters to dynamical states that are similar to each other, thus masking out the memory of the initial formation conditions of star clusters.

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