NDLI: Optimisation of phase factor in phase retrieval for reflector antennas with active surface

Content Provider	IET Digital Library
Author	Xu, Yueshu Ye, Qian Meng, Guoxiang
Abstract	The deformation of reflector surface can be obtained by Misell algorithm using two far-field amplitude patterns: one with the antenna in focus and the other with the antenna defocused. For reflector antennas with active surface, the defocused pattern can be measured by adjusting the panels to get a more effective phase factor instead of offsetting the sub-reflector. The shape and size of phase factor have a great influence on the accuracy of convergent solution. To improve the performance of Misell algorithm, this study proposed an optimisation method for phase factors under different surface deformations. This method utilises Levenberg–Marquardt algorithm to get an estimation of the aperture distribution and then applies the particle swarm optimisation to optimise the phase factor parameterised by Zernike polynomials. Numerical simulations show that the proposed method is an efficient tool to achieve applicable phase factors under different surface deformations. Using the optimised phase factor, Misell algorithm can get a better convergent performance than traditional Misell algorithm.
Starting Page	2285
Ending Page	2291
Page Count	7
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 15, Dec (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5072
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2018-08-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Surface Antenna Radiation Pattern Aperture Distribution Defocused Pattern Deformation Effective Phase Factor Far-field Amplitude Pattern Interpolation And Function Approximation Misell Algorithm Numerical Analysis Optimisation Method Optimisation Technique Particle Swarm Optimisation Phase Factor Optimisation Phase Retrieval Reflector Antenna Reflector Surface Single Antenna Surface Deformations Zernike Polynomials
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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