1.IntroductionAntennas are key components of any wireless system. An antenna is a conductor that can transmit, send and receive electromagnetic signals (microwave, radio or satellite)... Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. There are different types of antennas. The dipole antenna is the first type of antenna ever used and the simplest to study and understand, it is a straight wire fed from the center. Directional antenna is used for antennas that radiate power in a focused and specific direction. Microwave antennas which include parabolic reflector and horn antennas and are used for high gain. The Microstrip patch antenna is a single-layer design that generally consists of four parts (ground plane, patch, feed part, and substrate). Microstrip antennas, usually called patch antennas, consist of a very thin metal plate (usually copper or gold) placed a small fraction of a wavelength above a conducting ground plane, separated by a dielectric substrate. The radiating area can be of any planar geometry, e.g. circle, rectangle, square, elliptical, thin strip dipole, disk sector, triangular and circular ring. Radiating elements and feed lines are typically etched onto the dielectric substrate of a material. Microstrip antennas have some advantages such as light weight, low cost, etc. and some disadvantages such as low bandwidth and low efficiency. However, there are different methods to improve their efficiency and bandwidth. Microstrip patch antennas are low profile, adaptable to planar and non-planar surfaces, simple and inexpensive to manufacture using modern printed circuit technology, physically robust when mounted on a rigid surface...... middle from paper ......ao, Antennas and propagation for body-centric wireless communications, Artech House, 2006.6. DiBari, R., Q. H. Abbasi, A. Alomainy, and Y. Hao, An advanced UWB channel model for body-centric wireless networks," Progress In Electromagnetics Research, Vol. 136, 79{99, 2013.7. Chahat, N., C. Leduc, M. Zhadobov and R. Sauleau, Antennas and body interaction for millimeter-wave body-centric wireless communications", 2013 7th European Conference on Antennas and Propagation (EuCAP), 772 {775, 2013.8. Liu, ZG and YX Guo, Low-profile dual-band antenna for body-centric communications," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 4, 2282{2285, 2013.9. P. Salonen, Y. Rahmat -Samii, H. Hurme and M. Kivikoski, "Dual-Band Wearable Textile Antenna", IEEE International Symposium on Antennas and Propagation, Monterey, CA, June 20 -26, 2004.