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Topology optimization of UWB monopole antennas
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.ORCID-id: 0000-0002-1318-7519
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.ORCID-id: 0000-0003-0473-3263
2013 (Engelska)Ingår i: 7th European Conference on Antennas and Propagation (EuCAP2013), New York: IEEE conference proceedings, 2013, s. 1488-1492Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

A Topology optimization technique is used for complete layout optimization of the radiating element of a planar monopole antenna. The design objective is to find a conductivity distribution that maximizes the energy received by the planar monopole over the frequency band 1-10 GHz. The finite difference time domain method (FDTD) is used for the numerical calculations, and an adjoint problem is derived to calculate the corresponding sensitivities. Numerical results show a promising use of topology optimization techniques for the systematic design of ultrawideband monopoles.

Ort, förlag, år, upplaga, sidor
New York: IEEE conference proceedings, 2013. s. 1488-1492
Serie
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Nyckelord [en]
adjoint equations, FDTD, Maxwell equations, topology optimization, ultrawideband (UWB)
Nationell ämneskategori
Datavetenskap (datalogi)
Identifikatorer
URN: urn:nbn:se:umu:diva-79479ISI: 000327126001092ISBN: 978-889070183-2 ISBN: 978-1-4673-2187-7 (tryckt)OAI: oai:DiVA.org:umu-79479DiVA, id: diva2:642023
Konferens
7th European Conference on Antennas and Propagation (EuCAP2013), Gothenburg, Sweden, 8-12 April 2013
Tillgänglig från: 2013-08-20 Skapad: 2013-08-20 Senast uppdaterad: 2018-06-08Bibliografiskt granskad
Ingår i avhandling
1. Metallic antenna design based on topology optimization techniques
Öppna denna publikation i ny flik eller fönster >>Metallic antenna design based on topology optimization techniques
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Umeå: Department of Computing Science, Umeå University, 2013. s. 15
Serie
UMINF, ISSN 0348-0542 ; 13.08
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:umu:diva-76691 (URN)978-91-7459-649-6 (ISBN)
Presentation
2013-05-03, Mit-huset, MC313, Umeå universitet, Umeå, 10:15
Tillgänglig från: 2013-07-10 Skapad: 2013-07-10 Senast uppdaterad: 2018-06-08Bibliografiskt granskad
2. Topology optimization of antennas and waveguide transitions
Öppna denna publikation i ny flik eller fönster >>Topology optimization of antennas and waveguide transitions
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis introduces a topology optimization approach to design, from scratch, efficient microwave devices, such as antennas and waveguide transitions. The design of these devices is formulated as a general optimization problem that aims to build the whole layout of the device in order to extremize a chosen objective function. The objective function quantifies some required performance and is evaluated using numerical solutions to the 3D~Maxwell's equations by the finite-difference time-domain (FDTD) method. The design variables are the local conductivity at each Yee~edge in a given design domain, and a gradient-based optimization method is used to solve the optimization problem. In all design problems, objective function gradients are computed based on solutions to adjoint-field problems, which are also FDTD discretization of Maxwell's equations but solved with different source excitations. For any number of design variables, the computation of the objective function gradient requires one solution to the original field problem and one solution to the associated adjoint-field problem. The optimization problem is solved iteratively using the globally convergent Method of Moving Asymptotes (GCMMA).

By the proposed approach, various design problems, including tens of thousands of design variables, are formulated and solved in a few hundred iterations. Examples of solved design problems are the design of wideband antennas, dual-band microstrip antennas, wideband directive antennas, and wideband coaxial-to-waveguide transitions. The fact that the proposed approach allows a fine-grained control over the whole layout of such devices results in novel devices with favourable performance. The optimization results are successfully verified with a commercial software package. Moreover, some devices are fabricated and their performance is successfully validated by experiments.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2015. s. 29
Serie
UMINF, ISSN 0348-0542 ; 15:07
Nyckelord
Maxwell's equations, topology optimization, antennas, waveguide transition, finite-difference time-domain, gradient-based optimization, adjoint-field problem, microwave devices.
Nationell ämneskategori
Datavetenskap (datalogi)
Forskningsämne
administrativ databehandling
Identifikatorer
urn:nbn:se:umu:diva-102505 (URN)978-91-7601-255-0 (ISBN)
Disputation
2015-05-26, Naturvetarhuset, N450, Umeå universitet, Umeå, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-05-05 Skapad: 2015-04-27 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Hassan, EmadeldeenWadbro, EddieBerggren, Martin

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