Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Characteristic Mode Analysis of Reflectarray Unit Cell
Date
2018-12-10
Author
Haykır, Yiğit
Aydın Çivi, Hatice Özlem
Metadata
Show full item record
Item Usage Stats
292
views
0
downloads
Cite This
In this work, characteristic mode analysis for unit cells of metal-only periodic structures such as reflectarrays, transmitarrays and frequency selective surfaces (FSS) is presented. Ewald’s representation of three dimensional (3-D) Green’s function for two dimensional (2-D) periodicity is utilized within the Method of Moment (MoM) analysis. Modal characteristics of reflectarray antennas are investigated. Relation between characteristic modes and the reflection coefficients for reflectarray antennas is discussed. It is concluded that the theory of characteristic mode (TCM) can be exploited for the design and analysis of reflectarray antennas.
Subject Keywords
Reflectarray antenna
,
Characteristic mode
,
Periodic Green’s function
,
Ewald method
URI
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8671668
https://hdl.handle.net/11511/72505
Conference Name
12th European Conference on Antennas and Propagation (EuCAP 2018) (9 - 13 Nisan 2018)
Collections
Department of Electrical and Electronics Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Characteristic Mode Analysis of Unit Cells of Metal-Only Infinite Arrays
Haykır, Yiğit; Aydın Çivi, Hatice Özlem (2019-09-01)
Characteristic mode analysis of metal only unit cells of periodic structures is performed using Method of Moments based formulation. Ewald's transformation is incorporated for a fast and cost efficient solution and the advantages over spatial Green's function are discussed. The influence of the unit cell size on the characteristic modes is demonstrated. Various metal-only reflectarray elements are compared and their radiation characteristics are interpreted using the theory of characteristic modes. It is sh...
Multiscale Modeling of Thin-Wire Coupling Problems Using Hybridization of Finite Element and Dipole Moment Methods and GPU Acceleration
ÖZGÜN, ÖZLEM; Mittra, Raj; Kuzuoğlu, Mustafa (2020-01-01)
In this article, a hybrid numerical method, called finite element method (FEM) + dipole moment (DM), is presented for efficient solution of multiscale electromagnetic radiation and scattering problems that involve structures with fine features, such as thin-wire antennas or objects. In this method, the FEM is hybridized with the DM approach to help ease certain computational burdens, such as mesh refinement, ill-conditioning, memory overload, and long computation times, when solving multiscale problems with...
An Efficient Numerical Approach for Evaluating Sommerfeld Integrals Arising in the Construction of Green's Functions for Layered Media
Özgün, Özlem; Mittra, Raj; Kuzuoğlu, Mustafa (2022-01-01)
This paper presents an efficient approach for evaluating the Sommerfeld integrals in the spectral domain, whose integrands typically show an oscillatory and slowly decaying behavior at high frequencies, e.g., in the millimeter wave regime. It is well known that these integrals arise in the representations of the dyadic Green's functions of layered media and efficient computation of these Green's functions is key to rapid CEM modeling of patch antennas and printed circuits designed for 5G appli...
Effect of electrolyte/sulfur ratio in the cathode on the electrochemical performance of Li-S batteries
Emerce, Nur Ber; Külah, Görkem; Eroğlu Pala, Damla; Department of Chemical Engineering (2019)
In this study, the effect of electrolyte to sulfur (E/S) ratio in the cathode, which is an important cell design parameter, on the electrochemical and cell- and system-level performance of a Lithium-Sulfur (Li-S) battery is investigated through modeling efforts. First, a 1-D electrochemical model is developed for an isothermal, constant-current discharge of a Li-S cell to predict the voltage at 60% discharge depth. In the model, cathode exchange current density is defined as a linear function of the electro...
Complete and Accurate Discrete Complex Image Approximation of Periodic Green's Function in Layered Media
Adanir, Suleyman; Alatan, Lale (2014-08-01)
The periodic Green's functions (PGF) in layered media can be expressed as an infinite series in terms of the spectral domain Green's functions. The discrete complex image method (DCIM) can be used to approximate these spectral domain Green's functions. In this work, it is demonstrated that the complete and accurate DCIM approximation of the PGF is possible only when the DCIM approximation is obtained through the samples of the spectral domain Green's function along the real k(p) axis. This choice of samplin...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Y. Haykır and H. Ö. Aydın Çivi, “Characteristic Mode Analysis of Reflectarray Unit Cell,” presented at the 12th European Conference on Antennas and Propagation (EuCAP 2018) (9 - 13 Nisan 2018), London, England, 2018, Accessed: 00, 2021. [Online]. Available: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8671668.