Crosstalk Reduction Technique For GPS Transmission Lines in 5G Smartphones

Crosstalk Reduction Technique For GPS Transmission Lines in 5G Smartphones
  IJETT-book-cover           
  
© 2021 by IJETT Journal
Volume-69 Issue-7
Year of Publication : 2021
Authors : Saif. E. A. Alnawayseh, Mayyadah Alma’aitah
DOI :  10.14445/22315381/IJETT-V69I7P204

How to Cite?

Saif. E. A. Alnawayseh, Mayyadah Alma’aitah, "Crosstalk Reduction Technique For GPS Transmission Lines in 5G Smartphones," International Journal of Engineering Trends and Technology, vol. 69, no. 7, pp. 29-37, 2021. Crossref, https://doi.org/10.14445/22315381/IJETT-V69I7P204

Abstract
Navigation and positioning systems are very crucial now due to their extensive applications. Radiofrequency interference (RFI) can occur in a phone due to the closeness of the band spectrum emitted from the phone components and the weak isolation due to phone size limitations or miniaturization. Among the other sources, crosstalk noise is a major factor for RFI. Crosstalk noise is a major threat to electromagnetic compatibility (EMC) and Signal Integrity (SI). In this study, a new design for serpentine guard trace (SGT) in the presence and absence of vias is proposed to reduce the crosstalk effect in Global Positioning System (GPS) in 5G smartphones. Then, the Near-End and Far-End Crosstalk (NEXT and FEXT) for the proposed design in the frequency range of GPS of 1.1 to 1.5 GHz was studied. The NEXT (S31) and FEXT (S41) were calculated using Computer Simulation Technology (CST) microwave studio software. Also, the parameters that affect the Crosstalk reduction were optimized using Response Surface Methodology (RSM). The results show that the values of NEXT and FEXT vary with frequency, horizontal segment width, and the number of vias. The highest reduction of NEXT and FEXT were achieved when Serpentine Guard Trace Vias (SGTV) with 0.9mm width was used. By using Serpentine Guard Trace (SGT) instead of rectangular Guard Trace (GT), the NEXT values were reduced by around 25dB. Also when vias were added, the NEXT values were reduced by around 33.8 dB. While the FEXT values were reduced by around 11 dB with no vias and around 23dB in the presence of vias. For the electric field distribution, using a serpentine guard trace reduces the intensity of the electric field. Also, by adding vias, the attenuation of the electric field increases suggesting a reduction in crosstalk. For magnetic field distribution, using a serpentine guard trace reduces the intensity of the magnetic field. Also, by adding vias, the attenuation of the magnetic field increases, and this suggests that there is a reduction in the induction effects acting on the victim line that leads to a reduction in the crosstalk.

Keywords
5G Smartphones, GPS Transmission, Crosstalk

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