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Your search keyword '"Wireless communication systems"' showing total 3 results
Start Over Descriptor "Wireless communication systems" Language english Publisher hindawi limited
3 results on '"Wireless communication systems"'

1. New Compact antenna based on simplified CRLH-TL for UWB wireless communication systems.

Author

Alibakhshi‐Kenari, Mohammad, Naser‐Moghadasi, Mohammad, Ali Sadeghzadeh, Ramazan, Singh Virdee, Bal, and Limiti, Ernesto

Subjects
*ULTRA-wideband antennas, *MICROWAVE transmission lines, *WIRELESS communications, *PLANAR antennas, *COPLANAR waveguides, *BANDWIDTHS
Abstract

ABSTRACT This letter presents the experimental results of a novel planar antenna design which is synthesized using simplified composite left/right-handed transmission-line (SCRLH-TL), which is a version of a conventional composite left/right handed-transmission-lines (CRLH-TL), however, with the omission of shunt-inductance in the unit-cell. SCRLH-TL exhibits a right-handed response with nonlinear dispersion properties and a smooth Bloch-impedance distribution. Arranged within the inner slot of the antenna are three smaller rectangular patch radiators. Each patch radiator is embedded with an E-shaped notch, and located in the antenna conductor is a larger E-shaped notch next to the 50-Ω termination. The E-shaped notches constitute SCRLH-TL property. The gap in the slot between the smaller patches and the conductor next to the larger E-shaped notch determines the impedance bandwidth of the antenna. The dimensions of the smaller patches determine the radiation characteristics of the antenna. The antenna is excited using a conductor-backed coplanar waveguide transmission-line. The antenna covers a bandwidth of 7.3 GHz between 0.7 GHz and 8GHz, which corresponds to 167.81%. In this band, the antenna resonates at 4.75 GHz and 7 GHz; the gain and radiation efficiency at these frequencies are 4 dBi-80% and 3.6 dBi-73%, respectively. The antenna's performance was validated through measurement. The antenna has dimensions of 0.0504 λ0 × 0.0462 λ0 × 0.0018 λ0, where λ0 is free-space wavelength at 700 MHz. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:217-225, 2016. [ABSTRACT FROM AUTHOR]

Published
2016
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2. An Improved Artificial Bee Colony Algorithm in LoRa Wireless Communication System for Efficient Multimedia Transmission

Author

Panfeng Xu, Long Yue, Min Song, Huang Lidong, Li Lili, and Song Yan

Subjects
Article Subject, Artificial neural network, Computer science, business.industry, Communication, Mesh networking, 020206 networking & telecommunications, 02 engineering and technology, Telecommunications network, lcsh:Telecommunication, Artificial bee colony algorithm, Base station, Multimedia transmission, Wireless communication systems, lcsh:TK5101-6720, 0202 electrical engineering, electronic engineering, information engineering, Media Technology, 020201 artificial intelligence & image processing, Electrical and Electronic Engineering, business, Gradient method, Computer network
Abstract

Video streaming communication networks will be a very important way to send multimedia information anytime and anywhere, and the construction of the network base station which transmits signals is crucial in future. However, there is a contradiction between the power consumption of LoRa nodes and the real-timeliness of mesh network. In order to solve the contradiction, this article aims to combine the mesh network of LoRa wireless communication system with an improved artificial bee colony algorithm. Specifically, an artificial bee colony algorithm, which is based on RBF radial basis neural network trained with random gradient method, is designed. Simulation results show that the proposed algorithm solves the contradiction between power consumption and real-timeliness effectively. When using this improved network system structure to send multimedia information, it shows obvious superiority in terms of the high efficiency and real-timeliness of multimedia transmission.

Published
2018

3. Complete Characterization of Novel MHMICs for V-Band Communication Systems

Author

D. Hammou, Tarek Djerafi, Serioja Ovidiu Tatu, C. Hannachi, and Z. Ouardirhi

Subjects
Engineering, Computer engineering. Computer hardware, General Computer Science, Article Subject, business.industry, 020208 electrical & electronic engineering, Electrical engineering, 020206 networking & telecommunications, 02 engineering and technology, Communications system, Characterization (materials science), Ceramic substrate, TK7885-7895, Wireless communication systems, Signal Processing, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wilkinson power divider, Hybrid coupler, Electrical and Electronic Engineering, Wideband, business, V band
Abstract

This paper presents the characterization results of several new passive millimeter wave circuits integrated on very thin ceramic substrate. The work is focused on the design and characterization of a novel rounded Wilkinson power divider, a 90° hybrid coupler, a rat-race coupler, and a novel six-port (multiport) circuit. Measurements show the wideband characteristics, allowing therefore their use for multi-Gb/s V-band wireless communication systems.

Published
2013

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