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The Application of Microwave Crystal Structure in GPS Antenna

Author: ChenZuoFeng
Tutor: LiuXueGuan
School: Suzhou University
Course: Communication and Information System
Keywords: Photonic crystal PBG structure GPS antenna Circularly polarized
CLC: TN967.1
Type: Master's thesis
Year: 2008
Downloads: 225
Quote: 2
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Abstract


With the continuous expansion of the applications of satellite positioning technology, the receiving terminal of the Global Positioning System (GPS) is increasingly diverse, which makes the GPS antenna needs to diversify. Microstrip GPS antenna is one of the most commonly used antenna, how to further improve its performance is an issue of great concern in the industry. In recent years, the microwave photonic crystals due to the unique nature of which has become a new research focus in the technology sector. System microwave photonic crystal applications in GPS antenna. This paper first introduces a photonic crystal structure development at home and abroad, as well as the wireless test systems used in the test, and to lay the foundation for the further study of the following; went on to discuss the basics of photonic crystal and theoretical analysis method, introduced a commonly used research methods that Prague microstrip antenna scattering theory and numerical analysis methods, and gives a typical application of photonic crystal; then analyze the microstrip antenna radiation principles and design methods, learning and design a microstrip line double stub impedance matching network; The basic principle, independent design a practical a ceramic substrate GPS antenna, and the test results indicate that the antenna is fully meet the commercial requirements; finally a detailed study of the impact of a variety of photonic crystal structure on the performance of the GPS antenna, many useful conclusions. Microwave the photonic crystals GPS antenna research, the first to use simulation software to design a conventional the GPS microstrip patch antenna, the proposed antenna is produced according to the model processing, and testing the antenna parameters as cf. Objects. And then combined with the knowledge of the theory of photonic crystal, tap the ground to load the photonic crystal structure, dielectric photonic crystal structure and high impedance surface photonic crystal structure study three types of photonic crystal structure of the GPS antenna. Were designed on the basis of optimizing software simulation produced: periodic circular, square, and dual vibration sub shaped defect structure, medium cycle through hole structure, a square and a regular hexagon metallic patch over the hole grounding structure six different microwave photonic crystal structure GPS antenna. And each of these six parameters of the antenna analysis and practical test. The results show that: the antenna gain of the photonic crystal structure is loaded indicator has a certain improvement in the axial ratio of the antenna are improved, so that the characteristics of the circular polarization of the GPS antenna. Finally, in order to verify the effectiveness of the photonic crystal structure of the antenna, on the physical antenna outdoor reception signal Experimental, experimental results show that: the antenna of the photonic crystal structure significantly improves the signal-to-noise ratio, it is possible to good reception of GPS satellite signals. This work has laid a good foundation for microwave photonic crystal structure used in GPS antenna.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio navigation > Navigation systems of the various institutional > Satellite navigation system
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