“…Antenna is a device for radiating or receiving electromagnetic waves in wireless apparatus, which has been used widely in communication, radar, guidance, remote sensing, electronic countermeasure, radio astronomy and so on. As an energy transducer, the antenna can convert high frequency current or energy of waveguide to special electromagnetic wave energy for radiating or receiving [1]. There are two types of antenna according to its structure, which are wire antenna made of conductor line metal bar, such as dipole antenna, vertical antenna, and surface antenna made of metallic face, such as horn feed antenna, microstrip antenna.…”