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The Beidou satellite miniaturization terminal antenna design

Author: ZhouZuo
Tutor: PanJin
School: University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Beidou satellite navigation system Miniaturization Wide beamwidth High dielectric constant
CLC: TN822
Type: Master's thesis
Year: 2011
Downloads: 269
Quote: 1
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Abstract


The satellite navigation system is an important space infrastructure, can be widely used in various aspects of social life, with the major political, military, social significance, but also bring huge economic benefits to humanity. Beidou satellite navigation system of independent research and development, an independent satellite navigation system run by the space end, the ground-side and user side is composed of three parts. Beidou client receiver design, the right-hand circularly polarized antenna is a key component. The antenna of the receiver is required to have omni-directional width, the right-handed circularly polarized main beam function, in order to eliminate the multi-path reflections from the ground and to reduce the interference of the ionosphere. Taking into account the requirements of the portable terminal device, in the antenna design, the size should be as small as possible. Antenna size for index requirements 0.21λ × 0.21λ × 0.07λ (λ for frequencies less than the wavelength in free space), and low elevation gain and axial ratio higher performance requirements, this article uses a high dielectric constant material microstrip antenna downsized. For narrowing the bandwidth of microstrip antennas, radiation deterioration and other drawbacks of the application of a high dielectric constant material, effective in improving the power feeding structure, and improve the feeding performance and avoid metal patch and a feed network coupling, and the use thicker dielectric substrate, a compromise to meet the special requirements of navigation the terminal receivers for antenna performance. The main contribution of this paper are: 1 summarizes the characteristics and design difficulties Beidou terminals miniaturized antenna, and a detailed study of the high dielectric constant ceramic material impact on the performance of the antenna, and the antenna miniaturization technology application status on future designers of high dielectric constant material for the production of miniaturized microstrip antenna reference. 2 with the requirements of the Beidou satellite navigation system for wide-beam antenna, especially on antenna miniaturization, making a size 0.21λ × 0.21λ × 0.07λ miniaturized antenna within the antenna relative permittivity was 21.4, loss tangent less than 0.0003 microwave ceramic materials for dielectric substrate, integrated application Wilkinson fed the network isolation flooring, electrical wall technology, to meet the overall requirements of the indicators. 3 do to of terminal metal platform the size of the impact on the performance of the antenna numerical analysis, terminal platform the size of the antenna performance, some numerical results. The overall design of the RF system, and consider the relationship between the antenna and the ground metal surface, it is possible to greatly improve the performance of the antenna itself.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: the band and the wave mode of transmission points
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