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205006 Analysis of axially displaced elliptical antenna using hybrid method


Axially displaced elliptical (ADE) antenna is an evolved version of Gregorian antenna, bearing advantages of minimized blockage and relatively uniform field distribution. However, the analysis of the electrical performance of this type of antenna is a difficulty to be addressed properly. To enable the simulation of such type of reflector antenna, a hybrid method is derived for predicting the farfield of ADE antennas. Closed formulae are firstly derived for the calculation of the near field of ADE antennas based on vector analysis and the law of energy conservation. These formulae avoid time-consuming surface current integration and the current singularity on the vertex of the sub-reflector. In addition, the nature of vector analysis makes the hybrid method be capable of predicting vector electric field precisely. Furthermore, since these formulae are in explicit manner, no ray tracing process is required. The farfield is then predicted using Huygens equivalent method, assuring the accuracy in the farfield. Compared to published experimental results in the literature, the proposed method agrees well with the measurement in the main beam region. In comparison to physical optic method, the computational efficiency is much improved.


Liu Xiaoming1, Yu Junsheng1, Chen Xiaodong2

1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

2. School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK


ADE antenna, hybrid method, Huygens equivalent method


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