In this chapter, a diamond cut shape antenna has been simulated under CST software using twisting material (i.e., leather). The dielectric constant of leather material is 1.655. For antenna to be twist, leather substrate is used. The return loss of this newly design diamond cut shaped antenna is -35 dB at 5.5467 GHz resonant frequency. This type of antenna can be useful in BAN (body area network) applications. In this chapter, simulated results like return loss graph, 3-D pattern, and polar plot are presented.