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SERAFICA, Reymond D.

SERAFICA, Reymond D.

Engr. Reymond D. Serafica graduated cum laude from the University of Santo Tomas with a Bachelor of Science degree in Electronics Engineering last 2017. Within the same year, he became a licensed engineer and a faculty member in the Electronics Engineering Department of the University of Santo Tomas. He also co-authored a research entitled, “Sitting Posture Assessment using Computer Vision,” which was published in the IEEE International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management last 2017. In 2025, he graduated with a master’s degree, focused on the design of a bidirectional common-mode noise filter for antenna front-end applications, from the Department of Electronic and Computer Engineering at National Taiwan University of Science and Technology.

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Engr. Reymond D. Serafica, MSc

Department of Electronics Engineering

rdserafica@ust.edu.ph

 

Academic Qualifications

Research Highlights

Research Interests

Academic Qualifications

Degrees

  • Master of Science in Electronic and Computer Engineering, National Taiwan University of Science and Technology – Taipei, Taiwan, 2025
  • Bachelor of Science in Electronics Engineering, University of Santo Tomas – Manila, Philippines

Research Highlights

  • With the increasing demand for signal integrity, the integration of the differential topology for front ends, both for radio transmitters and receivers, is becoming prevalent to adopt its advantages. Consequently, the front end becomes susceptible to common-mode noise which are caused by asymmetries and discontinuities in the conductor traces on the printed circuit board. The presence of common-mode noise would cause the differential pair of transmission lines to act as an antenna, creating electromagnetic interference on the neighboring circuit stages, compromising the signal integrity of the differential signals. Hence, the use of common-mode noise filters in the front end becomes a necessity, since ordinary filters such as the lowpass, bandpass, or highpass filters are not sufficient to eliminate common-mode noise. With this, a bidirectional multiband common-mode noise filter is designed with the aid of its transmission line equivalent circuit to eliminate common-mode noise within the WiFi spectrum: the 2.4-GHz band (2.4 – 2.48 GHz), the 5-GHz band (5.17 – 5.33 GHz), and including the most recent addition, the WiFi 6-GHz band (5.925 – 7.125 GHz). The results from the full-wave simulation of the prototype using Ansys High-Frequency Structure Simulator show that the proposed common-mode filter could block common-mode noise from proceeding to the next output of either direction, offering common-mode stopbands below -10 dB at 1.36 – 2.61 GHz, 3.93 – 5.38 GHz, and 5.87 – 7.53 GHz, while allowing differential signals to pass through from either direction with maintained signal integrity, having differential-mode insertion loss of above -1.15 dB from DC to 8 GHz.

Research Interests

  • Signal integrity, microstrip transmission line circuits, common-mode noise filters

Courses Handled

Major Recognitions

Professional Activities

Courses Handled

  • ENG 203: Calculus 1
  • ENG 206: Calculus 2
  • ENG 207B: Physics for Engineers 1B
  • ENG 2014: Differential Equations
  • ECE 21110: Advanced Engineering Mathematics 
  • ECE 21111: Electromagnetics
  • ECE 21113L: Signal Processing Theory and Applications Laboratory

Major Recognitions

  • Cum laude, BS ECE, University of Santo Tomas, 2017

Professional Activities

  

Selected Publications

Selected Publications

  • J. C. T. Mallare et al., “Sitting posture assessment using computer vision,” 2017 IEEE 9th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM), Manila, Philippines, 2017, pp. 1-5, doi: 10.1109/HNICEM.2017.8269473.