The book "Planar Ultra Wide Band Antennas and Band Rejection Characteristics" offers a comprehensive analysis and innovative approaches to the development of Ultra WideBand (UWB) antennas. In a time when the demand for efficient, cost-effective, and high-performance wireless communication systems is increasing, this technical book highlights the significance of UWB antennas in modern applications. The authors, Zeeshan Ahmed, Faiz K. Lodhi, and Farooq A. Bhatti, present a novel miniaturized UWB antenna with dual band rejection characteristics, specifically designed for use in compact printed circuits. The antenna, printed on a cost-effective FR4 substrate, demonstrates promising results in the frequency ranges of Bluetooth and UWB. The implementation of U-shaped notches for rejecting specific frequency bands, such as WIMAX and X-band, is also discussed in detail. This book is aimed at professionals and students engaged in the development and application of UWB technologies.