Название: Wireless Technology: Kilohertz to Megahertz
Автор: Subal Kar
Издательство: CRC Press
Год: 2025
Страниц: 269
Язык: английский
Формат: pdf (true), epub
Размер: 25.1 MB

The text contains all the essential elements of communication principles, devices, circuits, antennas, and systems covering the electromagnetic spectrum from KHz to MHz of radio frequency (RF) that was developed in the formative stage of wireless technology. Also, the digital revolution, that has changed the landscape of modern electronics for wireless technology, has been discussed emphasizing the fundamentals including digital computers. The presentation of the book is in a concise yet complete way and stresses the physical and technical aspects with application viewpoints but using minimum possible mathematics.

Wireless technology has come a long way since its modest beginning in the first decade of the 20th century with an exponential growth of its developments in the following decades leading to a wholesale wireless-based lifestyle of today. This book has covered the electromagnetic (EM) spectrum of wireless technology from kilohertz (kHz) to megahertz (MHz), useful for entry-level students of wireless technology, delving into the developments of various electronic communication principles, kHz-to-MHz devices, circuits, and systems including antennas. In every sphere of life, we now use either electronic gadgets like smartphones, the internet, GPS, or wireless-based systems like radio, TV, radar, etc.

The idea of writing this book stems from addressing the urgent need with due perspective views to understand the physics of the subject and the application view-points of wireless technology from kHz-to-MHz of RF spectrum which primarily developed till World War II. For entry-level students of wireless technology, the development of devices, circuits, antennas, and systems from kHz-to-MHz is very important to appreciate the next stage developments of GHz and THz wireless technology during and after WW II, which is continuing even today. In all frequency ranges of wireless technology (covering kHz-to-THz), some of the underlying principles remain more or less the same; however, a number of special principles and design techniques also evolved with time for operation in the particular frequency range of operation of the electromagnetic spectrum. Thus for entry-level students of wireless technology, the history of the development of wireless technology from kHz-to-THz and the fundamental principles related to electronic communication, devices, circuits, antennas, and systems that developed in the kHz-to-MHz frequency domain are essential to have a solid foundation to look forward for advanced level studies with GHz and THz developments of wireless technology that took place subsequently.

The way of presentation of the subject content in this book has a speciality. Here the historical perspective of each and every invention has been touched upon, and the physical concepts of devices, circuits, antennas, and different systems of wireless technology covering the whole domain of kHz through MHz have been taken care of. Minimum possible mathematical expressions have been used, but not overlooking the essential ones, to substantiate the physical insight whenever it became absolutely necessary. This is not a typical textbook of communication, devices, or antennas alone but a holistic book on wireless technology from its inception till today for the kHz-to-MHz domain of electromagnetic spectrum, including the history of developments in the kHz-to-MHz through GHz to THz domain, that can cater to the thirst of the inquisitive minds of students, teachers, professionals, and general readers alike.

The book:

Discusses the historical background of different developments of wireless technology from KHz to MHz and going through the GHz to THz in due perspective to provide a holistic view of the development of wireless technology from its inception to contemporary times.
Contains in brief the basic concepts of electromagnetism like Maxwell’s wave equation, evanescent waves, surface waves, plasmonic waves that are used in wireless technology in some form or the other.
Highlights the need for modulation and covers various modulation techniques such as continuous wave and pulse analogue modulation and modulation/demodulation systems that were developed in the formative stage of the development of wireless technology in the RF frequency range of KHz to MHz.
Discusses the physical concepts and application view-points of active devices, RF transmission lines, antennas and systems used at KHz to MHz frequency domain of wireless technology.
Covers the digital revolution that has changed the wholesale electronic systems of modern wireless technology, and the development of digital computers has also been discussed with a brief overview of laptops, supercomputers, and upcoming quantum computers.

This overall scenario of historical perspective of wireless technology from KHz to THz and technical developments from KHz to MHz in the RF domain during the formative stage of development of wireless technology including fundamental developments related to digital revolution is expected to attract the interest of the entry level students, research scholars, professionals, and even the general readers alike with a new vision to have a quick yet in-depth glimpse of the progress of wireless technology since its inception till today. It is primarily written for junior undergraduate students in the fields of electrical engineering, electronics and communication engineering, wireless communication, telecommunication, and computer engineering. Research scholars and professionals can also refresh their idea of the developments of wireless technology during its formative stage and can get a flavour of the route to modern developments that have taken place henceforth.