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Research on the Key Techniques of Phased Array Antennas

Author: YeSheng
Tutor: JinRongHong
School: Shanghai Jiaotong University
Course: Electromagnetic Field and Microwave Technology
Keywords: Satellite Communications Microstrip antenna Printed dipole Phased array
CLC: TN821.8
Type: Master's thesis
Year: 2009
Downloads: 121
Quote: 0
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Abstract

With the development of society, the traditional satellite communications business has gradually from a fixed ground station communications tend to be flexible mobile communication. On a variety of mobile carrier, such as automobiles, ships, aircraft, etc., the use of satellite information exchange needs are increasingly urgent, this will definitely lead to the development of high performance antennas and smart beam control technology. Countries in the world in the relevant technical R \u0026 D is in the ascendant. Is generally believed that the phased array antenna is the best choice for mobile communication antennas, which is due to its rapid electronic beam scanning capability, is an important guarantee for smooth mobile communication. Array antenna is a key technology requirement is to find an appropriate antenna unit group array. Traditional receiving antennas often use a parabolic antenna, the unit high gain, but the volume is too large to cause the carrier movement wind load too negative. In recent years, the research focus tends to microstrip antenna design, mainly due to a series of advantages, such as compact size, low profile, light weight, etc.. In order to overcome the inherent defects of the microstrip antenna, such as the work of narrow band, low gain, it has proposed a series of improvements to common such as a dipole antenna, printed Yagi antenna. Printed dipole antenna with its excellent performance caused widespread concern in the traditional printed dipole antenna difficult to obtain a high-gain, composed of a large antenna array to meet satellite receiver requirements. This hot dipole antenna combined unit structure and its array the microstrip technology as satellite receiving antenna design, antenna high gain broadband characteristics of the class design points, and made an array antenna beam steering technology simulation discussion. Microstrip antenna background and how it works, first an overview of the development of the satellite receiving antenna Research, and related technologies are briefly compared the performance of the simple double-sided printed dipole antenna as a receiving antenna. A brief description of the electromagnetic simulation method used in the text. Novel coaxial fed dipole antenna structure on the basis of the above work, and analysis of the structure of the different shape of the patch as the electrical properties of the dipole arm. 32 array antenna to achieve a 22.8 dB of gain at the center frequency, the cross-polarization of the less than-25dB and about 20dB front to back ratio; 64 array antenna to achieve the gain of more than 26dB. At the same time, made the gain of the antenna unit to enhance the possibility of analysis. Further, the one pair of patch antenna is designed using the conventional microstrip patch antenna structure, contrast the different design of the patch antenna of the type, use this antenna processing 8 * 32 units of the array antenna, measured gain maximum value exceeds 28dB, to achieve the desired objectives. Finally, the analysis of the phase array antenna beam scanning with mechanical scanning signal by using the gradient algorithm simulation the interference beam pointing control process, random noise environment is confirmed by correlation algorithm to maintain beam stability of the signal tracking phased array function.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: work principle > Phased array antenna
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