Biochemie und Molekularbiologie

Abstract

Today, the advancement speed of wireless communication system is accelerated and consumers want a communication service without limit of space. A portable satellite communication service is required with the need and miniaturization of a mobile terminal is more important. The previous antenna for a satellite communication terminal, such as the Quadrifilar Helix antenna, is used but it is not suitable for portable by its huge volume To solve this problem, in this paper, miniaturizing a microstrip patch antenna with 3-dimensional structure is explained that it has a small volume, a low position, light weight, and mass production. Generally, since the size of a microstrip patch antenna is in proportion with the wavelength of a center frequency, a high permittivity dielectric is utilized for miniaturization of an antenna. However, this method causes drops of a radiating efficiency and bandwidth by the high permittivity. Therefore, folded structure and a method of using a plate attached in the bottom of an antenna are mixed rather than using a high dielectric. It is that a plate is attached on the edge of a folded antenna's patch. Also, to minimize an antenna, a method of folded structure is applied to resonance length L and width W in a general patch antenna.