Juan Antonio Martínez Rojas

Juan Antonio Martínez Rojas is an Associate Professor in the Department of Signal Theory and Communications at Universidad de Alcalá (UAH). He holds a Ph.D. from Universidad Complutense de Madrid (2000), specializing in ion spectrometry via photoionization and electron collision processes. His research focuses on electromagnetic systems engineering, antenna design for biomedical applications, and advanced signal processing techniques. He leads the Radiation and Sensing Group (RSG) and has contributed to over 50 peer-reviewed articles since 1982.

Education

• Ph.D. in Physics, Universidad Complutense de Madrid (2000)
• Thesis: "Espectrometría de iones obtenidos mediante procesos de fotoionización y colisión por electrones"
• Supervised by Dr. José Campos Gutiérrez and Dr. Montserrat Ortiz Ramis

Research Interests

• Electromagnetic field modeling and optimization
• Biomedical antenna systems and wireless power transfer
• Signal processing for material characterization
• Fractal-based image enhancement techniques
• Wood and biomaterial analysis using acoustic and vibrational methods

Key ContributionsHis work spans from antenna miniaturization for medical implants to non-destructive testing of materials through acoustic and vibrational analysis. Recent efforts focus on smartphone-based electromagnetic exposure assessment and systems engineering approaches to wireless energy transfer. He has pioneered fractal convolution methods for improving mammogram clarity and developed bio-inspired spectral techniques for wood classification.

Labs & TeamsPrincipal investigator of the Radiation and Sensing Group (RSG), collaborating on projects involving electromagnetic compatibility, biomedical sensors, and material characterization. Active in university-industry partnerships for wireless energy solutions in healthcare.