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A Study of Design Methods for Phased Array of Slots Located on the Narrow Side of Rectangular Waveguide

Author: LiXiuQing
Tutor: JinJie
School: Tianjin University
Course: Electromagnetic Field and Microwave Technology
Keywords: Antenna Rectangular Waveguide Narrow-Edge Slotting Sharp Cut-off Radiation Pattern
CLC: TN823.24
Type: Master's thesis
Year: 2009
Downloads: 74
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Abstract

Waveguide slotted antenna array is featuring compact structure, small dimension and light weight, of which type, the narrow-edge waveguide slotted antenna array has been drawn more and more attention from different projects and engineering industry as its features of low side lobe and even super side lobe. Meanwhile, it has been frequently applied for microwave communication and radar system to provide narrow beam and shaped beam as well. However, as influenced by some factors, such as theoretical calculation and machining accuracy, the designing of waveguide slotted antenna becomes a difficult and complicated task, especially the array designing of low side lobe and shaped beam.This thesis is emphasizing on the discussion of antenna design in accordance with the requirements of radiation pattern, which is one of the typical issues of antenna comprehension. However, it is not using traditional antenna comprehensive method; instead, in terms of the former project experience, the hypothesis of amplitude phase distribution for linear array will help to approach the radiation pattern as required, based on the guidance from antenna comprehensive theory.The main designing method referred in this thesis is, according to the request of a sharp cut-off radiation pattern, to analyze the features of rectangular waveguide slotting characteristics and the design requirements of waveguide slotting antenna, to give the hypothesis of amplitude phase distribution for linear array and get the slotting data by calculation verification. For the antenna comprehensive design based on radiation pattern, to avoid the sophisticated calculation process, we presume the current amplitude of slotted array element is bell-shaped decreased wave attenuation curve, phase distribution is anti-symmetric skew line and saturated part is undulating curve, which are on the basis of the Fourier relation transformation between distribution and radiation pattern of antenna aperture field. Furthermore, with the construction experience, we have derived the vertical directional function through the Euler formula of exponential function. Then after strict and repeated calculation, we can get the slotting data for designing as required.The result of modeling and simulation through ansoft software is complying with that of calculation basically. For during the process of function deduction of radiation pattern, we gave the hypothesis that the slotting array feeding phase is symmetric with reference of intermediate slot, which is not beneficial for the accuracy of shaped radiation pattern design. In terms of some experience of foreign designing, the asymmetric amplitude and phase distribution of slotting array feeding have been applied to improve the efficiency of antenna. Therefore, the ansoft software has been used for the optimization of slotting feeding, amplitude and phase distribution, in order to approach the radiation pattern of designing requirements.Finally, the narrow-edge waveguide slotted linear array has been manufactured on the basis of the modeling and simulation result; moreover, the testing has proved that the radiation pattern could meet the final design requirements.

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