eprintid: 675
rev_number: 9
eprint_status: archive
userid: 4
dir: disk0/00/00/06/75
datestamp: 2015-04-13 09:11:22
lastmod: 2015-04-13 09:15:35
status_changed: 2015-04-13 09:11:22
type: thesis
metadata_visibility: show
creators_name: Apolloni, F.
title: A System-by-Design Approach for the Synthesis of Metamaterial Microstrip-Printed WAIMs
ispublished: pub
subjects: DM
full_text_status: public
keywords: System-by-Design, Metamaterials 
abstract: Phased arrays supporting wide-angle electronic scanning have a fundamental importance in several applicative domains, including radar, remote sensing, and space communication systems. Most of these technologies require antenna elements capable of supporting high radiation powers, such as waveguide apertures, slots, and horns. Unfortunately, large arrays composed of these antennas are subject to variations of the reflection coefficient at the aperture-air interface with the scan angle. This effect, which is actually caused by the variations in the inter-element coupling when the array is scanned, can damage the feeding network itself if it is not compensated.
In this scenario, the use of thin planar dielectric sheets covering the array surface,  also named Wide Angle Impedance Matching (WAIM) layers, has been proposed to widen the effective scanning range of phased arrays. The WAIM thickness and its electromagnetic properties must be carefully designed in order to meet this goal.  
To address this issue, in this project the use of WAIMs made of planar metamaterials consisting of an infinite regular grid of suitably designed patches will be considered. More specifically, the aim of the activity will be to design the material composing the WAIM through a System-by-Design (SbD) strategy. Such an approach will comprise a Global Optimization block and a full-wave solver able to effectively deal with periodic structures of equal cells. The overall SbD strategy will therefore work on a "single cell" model, which will be simulated considering periodic boundary conditions. The goal of the synthesis will be to minimize the impedance mismatching for the waveguide-fed phased array when steered. The final result will be the design of a WAIM layer based on a planar microstrip-printed metamaterial.

date: 2015-01-02
date_type: completed
institution: University of Trento
department: ELEDIA Research Center @ DISI
thesis_type: masters
referencetext: [1]	G. Oliveri, F. Viani, N. Anselmi, and A. Massa, "Synthesis of multi-layer WAIM coatings for planar phased arrays within the system-by-design framework," IEEE Trans. Antennas Propag., in press.
[2]	A. Massa, G. Oliveri, P. Rocca, and F. Viani, "System-by-Design: a new paradigm for handling design complexity," 8th European Conference on Antennas Propag. (EuCAP 2014), The Hague, The Netherlands, pp. 1180-1183, Apr. 6-11, 2014.
[3]	G. Oliveri, L. Tenuti, E. Bekele, M. Carlin, and A. Massa, "An SbD-QCTO approach to the synthesis of isotropic metamaterial lenses," IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 1783-1786, 2014.
[4]	G. Oliveri, L. Tenuti, E. Bekele, M. Carlin, and A. Massa, "An SbD-QCTO approach to the synthesis of isotropic metamaterial lenses," IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 1783-1786, 2014. 
[5]	G. Oliveri, D. H. Werner, and A. Massa, "Reconfigurable electromagnetics through metamaterials - A review", Proc. IEEE, 2015, in press.
[6]	G. Oliveri, E. T. Bekele, D. H. Werner, J. P. Turpin, and A. Massa, "Generalized QCTO for metamaterial-lens-coated conformal arrays", IEEE Trans. Antennas Propag., vol.  62, no. 8, pp 4089-4095, Aug. 2014. 
[7]	G. Oliveri, P. Rocca, M. Salucci, E. T. Bekele, D. H. Werner, and A. Massa, "Design and synthesis of innovative metamaterial-enhanced arrays," IEEE International Symposium on Antennas Propag. (APS/URSI 2013), Orlando, Florida, USA, pp. 972 - 973, Jul. 7-12, 2013.
[8]	I. Martinez, A. H. Panaretos, D. H. Werner, G. Oliveri, and A. Massa, "Ultra-thin reconfigurable electromagnetic metasurface absorbers," EuCAP 2013, Gothenburg, Sweden, April 8-12, 2013.
[9]	G. Oliveri, "Improving the reliability of frequency domain simulators in the presence of homogeneous metamaterials - A preliminary numerical assessment," Progress In Electromagnetics Research, vol. 122, pp. 497-518, 2012. 

citation:   Apolloni, F.  (2015) A System-by-Design Approach for the Synthesis of Metamaterial Microstrip-Printed WAIMs.  Masters thesis, University of Trento.   
document_url: http://www.eledia.org/students-reports/675/1/Abstract.A542.pdf