Annapurna Das and Sisir Kumar Das are renowned experts in the field of microwave engineering. Annapurna Das is a professor in the Department of Electronics and Electrical Communication Engineering at the Indian Institute of Technology Kharagpur, India. Sisir Kumar Das is also a professor in the same department.
The book "Microwave Engineering" by Annapurna Das and Sisir Kumar Das is a popular textbook in the field of microwave engineering. The book provides an in-depth coverage of the subject, including the fundamentals of microwave engineering, transmission lines, waveguides, and microwave circuits.