Ultrawide Band Antenna for Wireless Communications

Due to worldwide spread of COVID, there is an increase in demand of wireless body area networks (WBANs). Wearable antennas are integral part of WBANs in Internet of Things (IoT) technology. To increase the bandwidth, ultrawideband (UWB) technology has been used. UWB offers many advantages such as small-range, large-bandwidth communications with very low power requirements. These advantages of UWB make it suitable for WBAN applications. But UWB antennas use partial ground planes to increase the bandwidth, which means UWB antennas provide poor isolation from the human body. This chapter reviews wearable antennas focusing on different designs based on substrate-integrated cavities, electromagnetic band gap structures, and UWB antennas. UWB antennas with band stop characteristics are also discussed. UWB covers frequency ranges from 3.1–10.6 GHz. Also WiMAX, WLAN, and X band come under this range. So, UWB receives interference from these channels. To avoid such unwanted signals, band stop filters are required. External filters can lead to a heavy size. So research has been presented in this chapter for integrated band stop filters to enhance the quality of UWB antennas. This depends on the application for which the antenna is to be used. © 2022 selection and editorial matter, Arun Kumar Rana, Nitin Goyal, Sharad Sharma, Suman Lata Tripathi.