| With the development of modern wireless communication, satellitenavigation and positioning system in defense industry and People’s Daily lifeare playing a more and more important role. Therefore, all countries areengaged in developing their own satellite navigation systems. Because ofincreasingly demanding requirement from system applications, the overallperformance of the satellite receiver has been improved dramatically. Sinceantenna is the key component in the receiver system, the performance of theantenna is vitally important to the whole system. In order to meet the risingdemand for satellite receiver, miniaturization, multiband and integration havebecome significant issues for antenna design.Based on the background of beidou satellite handset for the engineeringapplication and the summarization of the previous work, a tri-band stackedmicrostrip antenna has been proposed in this paper. What’s more, a creativework of quadrifilar helix antennas based on multilayer PCB technology andLTCC technology are also investigated in this work. The research content ismainly divided into the following parts:Firstly, the basic theory of and analysis methods of microstrip antenna andquadrifilar helix antenna are introduced. The miniaturization technology ofmicrostrip antenna is discussed. At the same time, the design method and theminiaturization technology of quadrifilar helix antenna are analyzed. Utilizingsingle-feed and dual-feed methods to realize circular polarization, a threelayers stacked microstrip antenna covered B3, L, S band is designed andfabricated and measured. The cost of the multiband microstrip antenna isgreatly reduced under the existing laboratory conditions, with relatively goodresults. The proposed antenna can be used on Beidou terminals to realize thelocalization and short message communication, which provides a low costchoice of multi-frequency antenna for Beidou second generation. Secondly, to meet the requirement of miniaturization and integration forantennas in handheld devices, a novel quadrifilar helix antenna based onmultilayer PCB technology has been investigated. The idea of dielectricloaded is used in the design for antenna miniaturization. The proposed antenna,which changes the traditional three-dimensional structure into quasitwo-dimensional structure, is only7mm hight, with stable performance at thesame time. Besides, the antenna-feeding system provide a reliable solution toget over the difficulties of integration and processing for traditional quadrifilarhelix antenna. It possesses the advantages of high integration, low cost andhigh stability. In a word, our work on helix antenna casts a new idea forbeidou satellite navigation terminal antenna.Finally, combining with LTCC technology, a new quadrifilar helixantenna based on LTCC technology is designed and the related parameters ofthe structure is studied. The proposed antenna has the a size of40mm×40mm×2.6mm, which achieves miniaturization and has a greatreference value for quadrifilar helix antenna’s complanation and integration.Besides, it has important innovative meanings to explore the solution tosatisfy the growing demands for miniaturization and high integration ofhandset antenna. |
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