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Some Techniques of Smart Antenna Arrays

Author: ZhangHou
Tutor: LiuQiZhong；GongShuXi
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Array antenna Current distribution Wavelet Asymptotic Wave Evaluation Full-wave analysis Bi-conjugate gradient
CLC: TN821
Type: PhD thesis
Year: 2003
Downloads: 710
Quote: 2
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Abstract


In the field of wireless communications, smart antenna technology is considered to be one of the key technologies in the future third-generation wireless systems. Because the array antenna is an important component of the smart antenna, so that the array antenna technology has become an urgent subject of great significance. The smart antenna ships and airborne microstrip antenna \the array impedance frequency characteristics of computing technology analysis and research, the main results are as follows: 1. First proposed a new type of smart antenna array structure, i.e. the annular reflective array, and respectively on the case of the four, six annular reflective array carried out a detailed analysis of the standard reflector array and non-reflective array calculated different spacings, different reflecting the direction of view of the transducer length. The results show that the reflection transducer introduced in the new structure can better improve the array factor characteristics of the annular array, reducing the difference between the lobes, forming a plurality of relatively uniform beam. 2. The first time Asymptotic Wave Evaluation (AWE) technology for the analysis of the array antenna calculated array of ring, ring reflector array, linear array and triangle array input admittance versus frequency curve, compared with the traditional method of moments greatly accelerated. Provides a fast and efficient method for the analysis of array antenna broadband. 3. Depth study of the radiation characteristics of the array unit and the radiation space for the different media, the first export the maximum radiation conditions and the minimum radiation conditions, gives a binary, ternary, the radiation direction of the array of FIG. 4. Developed to meet the technical specifications of the microstrip antenna array design of the traditional full-wave analysis methods and fast Fourier Fourier Transform (FFT) and bi-conjugate gradient (BCG) method combined for the analysis of microstrip antenna current distribution , improved calculation methods, to accelerate the calculation speed. 5. Wavelet transform method of moments, the general method for solving wire antenna current distribution, the calculation of the amount is less than the ordinary method of moments. Calculated by each other ring antenna and sleeve antenna, that the validity and reliability of the method.

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