Antennas And Wave Propagation

The wireless communication serves the efficient information among two or more points wirelessly. Antenna is the main component in the communication, which radiates and receives the radio waves or in broad way. The antenna also plays a role of impedance matching device, which performs the matching of impedances like free-space & transmitter and receiver impedances at receiver end. Nowadays, the compact antenna with a better performance and multi-bands working frequencies is one of the main trends in modern wireless communications systems. This book aims to give comprehensive introduction to the fundamental principles of antennas and wave propagation. The book starts with an introduction of a new kind of image type glide path antenna system. It is similar to the M-array glide path antenna system, radiated by three antennas with capture effect. Since it uses separate transmitters to provide the course and clearance, it is tolerant to far-field reflectors and rising terrain. Moreover, this new type could tolerant to more difficult sites and needs less size of smooth ground and reflection plane. The book further presents significant information to design a MIMO antenna for UWB communication suitable for many applications in a wireless personal area network. UWB is a radio technology that can be used for transmitting and receiving a large amount of data over an ultra-wide frequency band with very low power and for short distances. It has some advantages like high data rate, low equipment cost, multipath immunity and finally ranging and communication at the same time is possible. In all wireless communication systems, the antenna has an essential role since it is the means by which the signals are converted from electrical to electromagnetic wave form and vice versa. The design of an UWB antenna is subject to numerous challenges such as achieving a wide impedance bandwidth and keeping high radiation efficiency. This book also introduces an advanced multiband patch antenna to explore the possibility of covering frequency bands of Wi-Fi, WiMAX and 5G. This antenna is more compact, highly directive which is essential for mobile application. It also has a very small return loss compared with other existing antennas. Its enormous bandwidth makes this antenna more appropriate for wireless communication systems. The book further focuses on the design and fabrication of different types of flexible and inflexible wearable fractal for modern wireless applications with body-area-networks (BANs). The Multi-strip Antenna fundamentals are discussed with its categorization. Various aspects of the Multi-strip antenna are also discussed along with the existing researches in it. This book will be of interest to the students, scientists, researchers, and other stakeholders associated with the subject area.