Design and analysis of UWB and MIMO antennas for modern wireless applications

Abstract

Nowadays microwave communities are working on the design and development of the integrated narrowband and Ultra Wide Band (UWB) antennas with notches. GSM (900 MHz) is used for mobile communication and Ultra Wide Band (UWB) technology frequency range (3.1 10.6 GHz) is used for short-range wireless communication system. UWB technology provides low power consumption, high data transfer rate (100 200 Mb/s), larger bandwidth, simple hardware configuration, and omnidirectional radiation pattern. Recently some portable notebooks have embedded with three antennas, two of them for the Wireless Local Area Network (WLAN) at two different frequencies and the other one for the Bluetooth application. These three antennas occupying much space lead to a complex system. However, the consumers prefer thinner and lighter devices for supporting multifunctional capabilities. newline newline Hence, there is a huge demand for the development of multi-band antennas for GSM, WLAN, Wi-Bro, Bluetooth, PCS/LTE, US Public Safety Band, WiMAX and UWB applications, due to their wide range of applications in almost all commercial communication devices such as tablets, medical instruments, USB dongles, smart phones, portable laptops and handheld electronic gadgets etc. However, designing such a multi-band antenna for the modern wireless communication system is quite a challenging task because it has to satisfy several technical and competing requirements such as multiple operating bands with wider impedance bandwidth, omnidirectional radiation pattern, constant gain, high radiation efficiency, and compact size. To fulfill the needs of consumers, a single antenna to work in GSM band as well as in the UWB band with dual notches is required to suppress the potential interference of WiMAX and WLAN frequencies. newline newlineFirstly, an Ultra Wide Band (UWB) with band notch characteristics is presented. The proposed antenna is consisting of a slotted circular disc with coplanar waveguide feed. The dual notch band is achieved when a combination of T and L-shaped slots are etc