scholarly journals Advances on Microwave Ceramic Filters for Wireless Communications (Review Paper)

2018 ◽  
Vol 8 (5) ◽  
pp. 2762
Author(s):  
Stelios Tsitsos
Keyword(s):  
Wireless Communications ◽  
Optimal Design ◽  
Review Paper ◽  
Measured Data ◽  
Equivalent Circuits ◽  
Ceramic Filters ◽  
Microwave Ceramic ◽  
Technological Developments ◽  
Evolution Algorithms

<p>A review of the technological developments on ceramic monoblock filters and duplexers over the years is presented in this work. Early designs based on simulated and measured data are presented along with later designs based on accurate equivalent circuits as well as the use of evolution algorithms for optimal design. </p>

scholarly journals Fast Handover Algorithm Based on Location and Weight in 5G-R Wireless Communications for High-Speed Railways

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3100
Author(s):  
Baofeng Duan ◽  
Cuiran Li ◽  
Jianli Xie ◽  
Wei Wu ◽  
Dongmei Zhou
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Measured Data ◽  
Fast Handover ◽  
Research Directions ◽  
Low Delay ◽  
Fifth Generation ◽  
Key Technologies ◽  
Direction Of Movement ◽  
Handover Algorithm

With the booming development of high-speed railways (HSRs), key technologies of wireless communications need to be constantly innovated. In particular, the frontier issue of low delay of the handover for the fifth generation (5G) in fast-moving scenarios has attracted attention from both industry and academia. Based on an analysis of a large number of measured data and the location of the user equipment (UE), a fast handover algorithm is proposed to solve the problem of long delay for a train moving at high speed in a 5G-railway (5G-R). By calculating the speed of a train and its direction of movement, a reasonable handover mode is selected and the handover chain of neighboring cells is identified. The location of the train can be calculated to determine whether UE enters the defined identification zone of pre-handover. Depending on the values collected in the measurement report, the command of the handover is triggered when the weight of the target cell is greater than that of the source cell. Our experimental results show that the delay of the fast handover algorithm is reduced by 2.03%, and the success rate of the handover is increased by 0.42%. Research directions for smart railways are discussed based on these findings.

scholarly journals Design Analysis and Performance Evaluation of Annulus Patch Antennas

2019 ◽  
Vol 8 (3) ◽  
pp. 3116-3122 ◽  
Keyword(s):  
Performance Evaluation ◽  
Wireless Communications ◽  
Circular Ring ◽  
Design Analysis ◽  
Design Parameters ◽  
Equivalent Circuits ◽  
Patch Antennas ◽  
Resonant Frequencies ◽  
And Performance ◽  
Theoretical Foundations

The paper presents a detailed investigation of various types of circular ring patch antennas and their importance in Wireless Communications, especially under satellite Frequency Applications. The main focus is considered on the typical resonant frequencies, design parameters, theoretical foundations on the shape, equivalent circuits and various applications of the ring patch antennas. Design, simulation and comparison of different structures of patches with annulus patch were also presented to justify the investigation.

scholarly journals The Influence of Filter Parameters on the Response of Ceramic Filters Operating in the Thickness-Twist Mode

1981 ◽  
Vol 9 (2) ◽  
pp. 115-124
Author(s):  
S. Leppävuori ◽  
P. Ruuska
Keyword(s):  
Ceramic Material ◽  
Computer Programs ◽  
Phase Response ◽  
Equivalent Circuits ◽  
Linear Phase ◽  
Load Impedance ◽  
Ceramic Filters ◽  
Twist Mode ◽  
Parameter Values ◽  
Filter Response

Starting with common equivalent circuits, computer programs have been designed to enable the calculation of filter responses from the parameters of the ceramic material and the dimensions of the electrodes. By varying the parameter values their effect on the filter response is shown. To test the calculated results a number of test filters have been made and their responses measured. The filter responses have behaved as predicted by the calculations. It has been possible to calculate the response of thickness-twist mode filters with a centre frequency in the range 1 to 5 MHz, a bandwidth of 1 to 10%, a load impedance of 100 to 600 Ω and a comparatively linear phase response.

scholarly journals Challenges of additive manufacturing technologies from an optimisation perspective

2015 ◽  
Vol 6 ◽  
pp. A9 ◽  
Author(s):  
Sofiane Guessasma ◽  
Weihong Zhang ◽  
Jihong Zhu ◽  
Sofiane Belhabib ◽  
Hedi Nouri
Keyword(s):  
Additive Manufacturing ◽  
Optimal Design ◽  
3D Imaging ◽  
Review Paper ◽  
Structural Information ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Manufacturing Technologies ◽  
Dimensional Printing

Three-dimensional printing offers varied possibilities of design that can be bridged to optimisation tools. In this review paper, a critical opinion on optimal design is delivered to show limits, benefits and ways of improvement in additive manufacturing. This review emphasises on design constrains related to additive manufacturing and differences that may appear between virtual and real design. These differences are explored based on 3D imaging techniques that are intended to show defect related processing. Guidelines of safe use of the term “optimal design” are derived based on 3D structural information.

scholarly journals Optimal Design of a Rain Gauge Network Models: Review Paper

2019 ◽  
Vol 1366 ◽  
pp. 012072
Author(s):  
Nor Sofiza Abu Salleh ◽  
Mohd Khairul Bazli Mohd Aziz ◽  
Noraziah Adzhar
Keyword(s):  
Optimal Design ◽  
Review Paper ◽  
Network Models ◽  
Rain Gauge ◽  
Rain Gauge Network

scholarly journals Optimal Design of Linear Space Code for MIMO Optical Wireless Communications

2016 ◽  
Vol 8 (2) ◽  
pp. 1-12
Author(s):  
Yan-Yu Zhang ◽  
Hong-Yi Yu ◽  
Jian-Kang Zhang ◽  
Yi-Jun Zhu
Keyword(s):  
Wireless Communications ◽  
Optimal Design ◽  
Linear Space ◽  
Optical Wireless ◽  
Optical Wireless Communications

Statistics and parallaxes

1978 ◽  
Vol 48 ◽  
pp. 7-29
Author(s):  
T. E. Lutz
Keyword(s):  
Experimental Design ◽  
Statistical Methods ◽  
Review Paper ◽  
Systematic Errors ◽  
Past Experience ◽  
Random Errors ◽  
Trigonometric Parallaxes ◽  
Systematic And Random Errors

This review paper deals with the use of statistical methods to evaluate systematic and random errors associated with trigonometric parallaxes. First, systematic errors which arise when using trigonometric parallaxes to calibrate luminosity systems are discussed. Next, determination of the external errors of parallax measurement are reviewed. Observatory corrections are discussed. Schilt’s point, that as the causes of these systematic differences between observatories are not known the computed corrections can not be applied appropriately, is emphasized. However, modern parallax work is sufficiently accurate that it is necessary to determine observatory corrections if full use is to be made of the potential precision of the data. To this end, it is suggested that a prior experimental design is required. Past experience has shown that accidental overlap of observing programs will not suffice to determine observatory corrections which are meaningful.

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