Efficient analysis of phased arrays of microstrip patches using a hybrid generalized forward backward method/Green's function technique with a DFT based acceleration algorithm

Download

index.pdf

Date

2008-6

Author

Bakir, Onur
Aydın Çivi, Hatice Özlem
Erturk, Vakur B.
Chou, Hsi-Tseng

Metadata

Show full item record

Item Usage Stats

431
views

133
downloads

A hybrid method based on the combination of generalized forward backward method (GFBM) and Green's function for the grounded dielectric slab together with the acceleration of the combination via a discrete Fourier transform (DFT) based algorithm is developed for the efficient and accurate analysis of electromagnetic radiation/scattering from electrically large, irregularly contoured two-dimensional arrays consisting of finite number of probe-fed microstrip patches. In this method, unknown current coefficients corresponding to a single patch are first solved by a conventional Galerkin type hybrid method of moments (MoM)/Green's function technique that uses the grounded dielectric slab's Green's function. Because the current distribution on the microstrip patch can be expanded using an arbitrary number of subsectional basis functions, the patch can have any shape. The solution for the array currents is then found through GFBM, where it sweeps the current computation element by element. The computational complexity of this method, which is originally O (N-tot(2)) (N-tot being the total number of unknowns) for each iteration, is reduced to O(N-tot) using a DFT based acceleration algorithm making use of the fact that array elements are identical and the array is periodic. Numerical results in the form of array current distribution are given for various sized arrays of probe-fed microstrip patches with elliptical and/or circular boundaries, and are compared with the conventional MoM results to illustrate the efficiency and accuracy of the method.

Subject Keywords

Discrete Fourier transform (DFT), Finite arrays, Generalized forward backward method (GFBM), Method of moments (MoM)

URI

https://hdl.handle.net/11511/28505

Journal

IEEE Transactions on Antennas and Propagation

DOI

https://doi.org/10.1109/tap.2008.923314

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

Applications of hybrid discrete Fourier transform-moment method to the fast analysis of large rectangular dipole arrays printed on a thin grounded dielectric substrate Chou, HT; Ko, HK; Aydın Çivi, Hatice Özlem; ERTÜRK, VAKUR BEHÇET (2002-08-05) Recently a discrete Fourier transform-method of moments (DFT-MoM) scheme was developed for fast analysis of electrically large rectangular planar dipole arrays, which has been shown to be very efficient in terms of number reduction of unknown variables and computational complexity. The applications of this DFT-MoM to treat dipole arrays printed on a grounded dielectric substrate are examined in this Letter. Numerical results are presented to validate its efficiency and accuracy. (C) 2002 Wiley Periodicals, ...
Extension of Forward Backward Method with DFT Based Acceleration Algorithm for The Efficient Analysis of Radiation Scattering from Large Finite Printed Dipole Arrays Aydın Çivi, Hatice Özlem (Wiley, 2003-04-01) A discrete‐Fourier‐transform (DFT) based forward‐backward (FB) algorithm has been developed for the fast and accurate analysis of electrically large freestanding dipole arrays [1]. In this paper, an extension of the FB method (FBM) with a DFT‐based acceleration approach is presented to provide a relatively efficient analysis of EM radiation/scattering from an electrically large, planar, periodic, finite dipole array printed on a grounded dielectric substrate. Computational complexity of this new approach is...
Efficient Computation of Green's Functions for Multilayer Media in the Context of 5G Applications Mittra, Raj; Özgün, Özlem; Li, Chao; Kuzuoğlu, Mustafa (2021-03-22) This paper presents a novel method for effective computation of Sommerfeld integrals which arise in problems involving antennas or scatterers embedded in planar multilayered media. Sommerfeld integrals that need to be computed in the evaluation of spatial-domain Green's functions are often highly oscillatory and slowly decaying. For this reason, standard numerical integration methods are not efficient for such integrals, especially at millimeter waves. The main motivation of the proposed method is to comput...
Electromagnetic Scattering from Obstacles in the Near Field Region of Electrically Large Arrays Cetin, Ramazan; Aydın Çivi, Hatice Özlem; Nepa, Paolo; Manara, Giuliano (2009-09-18) In this paper, an efficient method for the analysis of electromagnetic scattering/radiation from the obstacles nearby electrically large array antennas, with nonuniform excitation, is proposed. The approach is based on the combination of a ray field representation of electrically large arrays and a DFT (Discrete Fourier Transform) based representation of array current distribution. Proposed method is applied to a 2D problem: Radiation of a linear array of 2N+1 infinitely long current elements with tapered c...
Efficient hybrid discrete Fourier transform-moment method for fast analysis of large rectangular arrays Chou, HT; Ho, HK; Pathak, PH; Nepa, P; Aydın Çivi, Hatice Özlem (Institution of Engineering and Technology (IET), 2002-02-01) A novel approach combining the moment method (MoM) and the discrete Fourier transform (DFT) is developed for the fast analysis of electromagnetic (EM) radiation/scattering from electrically large, finite, planar rectangular arrays. In particular, the unknown array distribution to be solved is represented in terms of the DFT within the MoM for a given array excitation. The proposed DFT-MoM approach for large arrays has the advantage that it can overcome the inefficiency of the conventional MoM approach by dr...

Citation Formats

O. Bakir, H. Ö. Aydın Çivi, V. B. Erturk, and H.-T. Chou, “Efficient analysis of phased arrays of microstrip patches using a hybrid generalized forward backward method/Green’s function technique with a DFT based acceleration algorithm,” IEEE Transactions on Antennas and Propagation, pp. 1669–1678, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28505.