Several Researches On New Scheme Low-profile Antennas

As an exchange energy device, an antenna plays an important role in the wireless communication systems. Antenna design has become a system subject as the mobile communication technology continues to develop, especially the popularity of different wireless terminals, and from the aerospace, maritime and other areas of promotion. Usually the antenna system is different for various practical applications. Antennas with low profile, small volume, high gain and high efficiency have been a hot topic in this field.This dissertation analyzes the relation between the Surface Plasmon Polaritons and the periodic structure of metal grooves. A low-profile, high-gain, antenna with simple structure is designed, based on the beam-focusing effect excited by SPPs mode in periodic metal grooves modulated with electromagnetic waves. This antenna has good performance with low cross polarization, low side lobe characteristics, and the symmetric of radiation pattern. One linear polarization and one circular polarization antennas are designed, and fabricated to satisfy the different specifications. Multi-band technology for microstrip antenna is discussed and subsequently a dual-band microstrip antenna is designed. Finally, an antenna element for satellite navigation antenna array is designed, through combining the advantages of periodic grooves and microstrip antenna technology. It helps to reduce the coupling magnitude between antenna elements.This dissertation mainly discusses the relation between SPPs and periodic grooves. Then four kinds of antenna model with simulation and test results are shown. Theoretical and experimental results show that this kind of antenna has a good potential in applications requiring higher performance, smaller volume and lighter weight.