-
A Novel Planar Slot Antenna Structure for 5G Mobile Networks Applications
Kamal Bouzakraoui,
Ahmed Mouhsen,
Abdelkader Youssefi
Issue:
Volume 5, Issue 4, August 2017
Pages:
111-115
Received:
29 April 2017
Accepted:
9 May 2017
Published:
4 July 2017
Abstract: Multi-antenna transmission already plays an important role in current generations of mobile communication and will be even more central in the 5G, due to the physical limitations of small antennas. Path loss between a transmitter and receiver does not change as a function of frequency, as long as the effective aperture of the transmitting and receiving antennas does not change. The antenna aperture does reduce in proportion to the square of the frequency, and that reduction can be compensated by the use of higher antenna directivity. The 5G radio will employ hundreds of antenna elements to increase antenna aperture beyond what may be possible with current cellular technology. This paper presents a new compact broadband planar slot antenna for such kind of wireless communication applications. To develop this structure we have conducted a design based on on the microstrip line combined with a slot technique and a modified geometry antenna in order to enlarge the bandwidth and adapting the impedance thus minimizing distortion in order to avoid high crosstalk and radiation. The proposed antennas have been successfully designed, optimized, miniaturized and simulated by using Momentum software integrated into ADS ”Advanced Design System” and CADFEKO. The final broadband antennas are operating in 9.84GHz on ADS and 9.5 GHz on FEKO respectively with a return loss less than -10dB.
Abstract: Multi-antenna transmission already plays an important role in current generations of mobile communication and will be even more central in the 5G, due to the physical limitations of small antennas. Path loss between a transmitter and receiver does not change as a function of frequency, as long as the effective aperture of the transmitting and recei...
Show More
-
Analysis of Short Circuit Fault for 4.6GHz/6MW LHCD High Voltage Power Supply
Zhigang Yang,
Peng Fu,
Fei Guo,
Haozhang Sun,
Jian Zhang,
Mao Wang,
Fukun Liu,
Yiyun Huang
Issue:
Volume 5, Issue 4, August 2017
Pages:
116-122
Received:
25 May 2017
Accepted:
3 June 2017
Published:
17 July 2017
Abstract: 4.6GHz/6MW Lower Hybrid Current Drive (LHCD) is one of plasma current heating methods for Experimental Advanced Superconducting Tokamak (EAST). High Voltage Power Supply (HVPS) is the power supply subsystem of 4.6GHz/6MW LHCD system, which was designed, built and accepted successfully by Chinese National Development and Reform Commission in 2015. Then the new system has been in use for the 2015 EAST campaign. This paper presents the structure of 4.6GHz/6MW LHCD-HVPS and its transient operation state when its klystron load has short circuit fault. In order to protect the klystron and HVPS itself, the short-circuit fault and its transient process are analyzed and calculated in detail. And a three-electrode gas switch has been built to eliminate the short-circuit fault in microseconds. In addition, the effectiveness of the three-electrode gas switch has been verified by simulation and experiment result. The HVPS has been used in 4.6GHz/6MW LHCD system and it has good performance for the entire 2015 EAST campaign.
Abstract: 4.6GHz/6MW Lower Hybrid Current Drive (LHCD) is one of plasma current heating methods for Experimental Advanced Superconducting Tokamak (EAST). High Voltage Power Supply (HVPS) is the power supply subsystem of 4.6GHz/6MW LHCD system, which was designed, built and accepted successfully by Chinese National Development and Reform Commission in 2015. T...
Show More
-
Super Capacitors Monitoring System Using CAN Bus Protocol
Josefina Castañeda-Camacho,
Angel Bulmaro-Sánchez,
Gerardo Mino-Aguilar,
Germán Muñóz,
Manuel Tlapa,
Daniel Ortiz
Issue:
Volume 5, Issue 4, August 2017
Pages:
123-129
Received:
18 May 2017
Accepted:
12 June 2017
Published:
18 July 2017
Abstract: The present work describes a monitoring system of a bank of supercapacitors (SCB) based on the use of CAN BUS protocol as the data transmission mode. A boost converter with 12.5 V at its output is included to stabilize the voltage in the supercapacitors. This paper provide a basis for the design of a diagnostic systems which aim to monitor the storage, to extend the supercapacitors life cycle and to detect the voltage variations outside the range of operation that could damage the bank. A circuit is implemented in a way that it allows to balance the voltages of the SCB and to avoid a variation of voltage that could cause the destruction of the components. The monitoring system will receive the voltage data of the SCB by means of the CAN bus protocol and show these voltages through a graphical interface in an intelligent screen, the monitoring will allow to detect an over voltage and thus avoid premature damage in these elements.
Abstract: The present work describes a monitoring system of a bank of supercapacitors (SCB) based on the use of CAN BUS protocol as the data transmission mode. A boost converter with 12.5 V at its output is included to stabilize the voltage in the supercapacitors. This paper provide a basis for the design of a diagnostic systems which aim to monitor the stor...
Show More
-
Structural Design and Hydrodynamics Analysis of Wave Energy Converter for Falculty of Engineering, Rmu
Isaac Owusu-Nyarko,
Emmanuel Nartey
Issue:
Volume 5, Issue 4, August 2017
Pages:
130-140
Received:
27 March 2017
Accepted:
20 June 2017
Published:
24 July 2017
Abstract: Due to the continuous fluctuation of the prices of oil and the environmental impact on the economy, a renewable energy becomes debatable issue. The generation of electricity by harnessing the power of sea wave has been the most prominent research into renewable energy for over decades. Various researches have used various power take off mechanisms systems for converting wave power into electrical power such as the pelamis, oscillating water column, Archimedes wave swing etc. In this research, linear generator power take of method is used to convert the motion of wave at its interaction with the devices into electricity since this method offers a great power output at a minimum wave energy power than other methods. Feasibility studies to ascertain the exact location for mooring of the components were conducted using google search. The analysis of a hybrid quantitative and qualitative method is applied. In this aspect, statistical analysis of sea wave data and the consumption of electrical gadget of the faculty engineering of Regional Maritime University were analysed in order to design a suitable wave energy converter. Hydrodynamic analysis of wave energy converter was determined in order to establish the velocity of sea wave, for due to the incident wave, the energy from sea wave and the electrical power generated by the generator as a result of sea wave energy.
Abstract: Due to the continuous fluctuation of the prices of oil and the environmental impact on the economy, a renewable energy becomes debatable issue. The generation of electricity by harnessing the power of sea wave has been the most prominent research into renewable energy for over decades. Various researches have used various power take off mechanisms ...
Show More
-
Evaluation of Electricity Demand Response from the Perspective of Marketization
Dong Jun,
Sun Xu,
Dou Xihao
Issue:
Volume 5, Issue 4, August 2017
Pages:
141-148
Received:
15 June 2017
Accepted:
29 June 2017
Published:
24 July 2017
Abstract: China electricity market reform will have a far-reaching impact on demand response, The demand response under the market mechanism is an important tool to alleviate the contradiction between power supply and demand, reduce the peak load and promote energy conservation and emission reduction. Based on the analysis of the operation mode of foreign demand response, this paper designs the demand response mechanism under the Chinese market mechanism. Based on the cost-benefit analysis method, the economic value generated by the implementation of the demand response is evaluated. The research results can provide decision support for demand response mechanism design and demand response mining in power market reform.
Abstract: China electricity market reform will have a far-reaching impact on demand response, The demand response under the market mechanism is an important tool to alleviate the contradiction between power supply and demand, reduce the peak load and promote energy conservation and emission reduction. Based on the analysis of the operation mode of foreign de...
Show More
-
Design of Innovative Digital Electronic Technology Experimental Case Teaching
Issue:
Volume 5, Issue 4, August 2017
Pages:
149-155
Received:
17 August 2017
Accepted:
1 September 2017
Published:
5 September 2017
Abstract: Due to the fact that the traditional Digital Electronic Technology (hereinafter referred to as DET) experiments bear sufficient reference material, elaborate design plan and complete design circuits (which makes it difficult for the students to design some experiments by themselves innovatively), but fail to bear enough experimenting methods, combined with the requirements raised by the competitions for experiment case teaching of elementary curriculums on electronic engineering and technique, in order to make some changes to the traditional experiment teaching, the paper innovated a new experiment case for the design of Rock-paper-scissors Game. In the design, two methods, Digital-integrated-circuit method and programmable-techniques method, are adopted to make it come true. When adopting digital-integrated-circuit method, right integrated circuit components will be employed according to the game-designing plan, using the software of Proteus to simulate it first, followed by debugging and testing of the hardware circuits on the bread board. The programmable-techniques method can describe the functions of the game on the development platform of the software of Quartus II by programming, adopting HDL (hardware description language). After right simulation, the programs will be downloaded onto FPGA experimental boxes or development board to realize the design of the game. The experimental case of Rock-paper-scissors Simulation Game is interesting and novel, which tends to stimulate the students to explore new world, study and innovate new things on their own. The adoption of the two methods will not only further enhance students’ knowledge application ability and engineer practice ability, but also help them better understand the difference of an experiment between the traditional and modern method, which will, in turn, understand the significance and value of programmable techniques in digital system designing.
Abstract: Due to the fact that the traditional Digital Electronic Technology (hereinafter referred to as DET) experiments bear sufficient reference material, elaborate design plan and complete design circuits (which makes it difficult for the students to design some experiments by themselves innovatively), but fail to bear enough experimenting methods, combi...
Show More
