Wireless Technology: Kilohertz to Megahertz
暫譯: 無線技術：千赫到兆赫

這段文字包含了通信原則、設備、電路、天線和系統的所有基本要素，涵蓋了從 KHz 到 MHz 的無線電頻率 (RF) 電磁波譜，這些內容是在無線技術的形成階段所發展出來的。

Subal Kar is a former Professor and Head of the Institute of Radio Physics and Electronics, University of Calcutta, India. His field of specialization is microwave and terahertz (THz) engineering, metamaterials, and high-energy physics. He has three patents to his credit and has published research papers in peer-reviewed international journals. He was visiting scientists at various universities and institutes in the United States, Europe, and Asia, including Lawrence Berkeley National Laboratory, USA, Oxford University, UK, Cockcroft Institute, and Kyoto University, Japan. He is the recipient of the Young Scientist Award of URSI and IEEE MTT, and the Fulbright Award from the US Government.

Subal Kar 是印度加爾各答大學無線物理與電子學研究所的前教授及所長。他的專業領域包括微波與太赫茲（THz）工程、超材料以及高能物理。他擁有三項專利，並在同行評審的國際期刊上發表了研究論文。他曾在美國、歐洲和亞洲的多所大學和研究機構擔任訪問科學家，包括美國勞倫斯伯克利國家實驗室、英國牛津大學、科克羅夫特研究所以及日本京都大學。他是URSI和IEEE MTT的青年科學家獎以及美國政府的富布賴特獎的獲得者。