# Timing Analyses in FWE Evaluation
## 3 Discussion and Future Work
The interconnection lengths' selection, single-ended or coupled, was made between 120 mm and 250 mm, since these are typical lengths on backplanes where signal integrity issues must be considered. Higher frequencies and higher lengths will be analyzed in our future work. With the increase in length and frequency rate, the eye closed and more distortions appeared. Therefore, the performance of the circuits was lower in this case. After all the simulations were carried out and based on the results obtained, we noticed how important was both the technology in which a circuit was designed and also the material we used. The stripline technology offers higher performance to the circuits, because the microstrip technology has a much higher emission rate, and this leads to the propagation of the signal on the neighboring line. Also, FWE can be fixed if it is noticed in time and the performance of the circuits can be improved. The main contribution consisted of the implementation of the circuits in the MWO design tool from AWR-DE; the selection of the specifications parameters for two substrates; a low-cost, conventional FR4 and a high-speed-oriented substrate, N4000-13, from the data sheets; and the implementation and analysis of the circuits. Both time and frequency domain simulations were performed, with the extraction of data from these simulations presented in detail in the Results section. In conclusion, in order to benefit from the highest possible performance for a given circuit, it is recommended to carry out an early verification of the impact of the effect of the fiber fabrics on the designed circuit, since it has been demonstrated through the simulations that the composite substrate influences, together with the increase in the frequency rate, the closing of the eye and encourages the appearance of distortion and interference. Conceptualization, M.S.-D., D.B. and S.H. ; methodology, M.S.-D. and S.H. ; software, M.S.-D. and D.B. ; validation, M.S.-D. and D.B. ; formal analysis, S.H. ; writing--original draft preparation, M.S.-D., D.B. and S.H. ; writing--review and editing, M.S.-D., D.B. and S.H. ; visualization, M.S.-D. and D.B. ; supervision, D.B. and S.H. All authors have read and agreed to the published version of the manuscript. This research received no external funding. All the results are contained within the article and the Appendices A and B. The authors declare no conflict of interest. The following abbreviations were used in this manuscript:  
AME  
Additively Manufactured Electronics  
AWR DE  
Applied Wave Research Design Environment  
CT  
Computer Tomography  
EM  
Electromagnetic  
FRCM  
Fiber-Resin Composite Materials  
FWE  
Fiber Weave Effect  
GBPS  
Gigabits Per Second  
HT  
Hilbert Transform  
IoT  
Internet of Things  
MWO  
Microwave Office  
PCB  
Printed Circuit Board  
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