This book constitutes the proceedings of the Second EAI International Conference on Advanced Technologies in Electronics, Communications and Signal Processing, ICATECS 2026, held in Hyderabad, India, during January 30-31, 2026.The 30 full papers included in this book were carefully reviewed and selected from 116 submissions. They are organized into the following topical sections: Wireless Communications & Signal Processing; Electronic Systems; Embedded and Machine Learning Approaches; Biomedical and Computing Systems; Communication Networks; and Electronics in Healthcare.