Topology Optimization of Metallic Antennas

We introduce an approach to carry out layout optimization of metallic antenna parts. An optimization technique first developed for the optimization of load-bearing elastic structures is adapted for the purpose of metallic antenna design. The local conductivity values in a given region are used as de...

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Veröffentlicht in:IEEE transactions on antennas and propagation Jg. 62; H. 5; S. 2488 - 2500
Hauptverfasser: Hassan, Emadeldeen, Wadbro, Eddie, Berggren, Martin
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.05.2014
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Adjoint field problem
Adjoints
Algorithms
Antennas
Applied classical electromagnetism
Applied sciences
Coaxial cables
coaxial feed model
Conductivity
Design
Electromagnetic wave propagation, radiowave propagation
Electromagnetism; electron and ion optics
Equations
Exact sciences and technology
Finite difference methods
Finite difference time domain method
finite-difference time-domain (FDTD)
Frequency bands
Fundamental areas of phenomenology (including applications)
Mathematical model
Mathematical models
microstrip antennas
Optimization
Optimization techniques
Patch antennas
Physics
Radiocommunications
Telecommunications
Telecommunications and information theory
Time-domain analysis
topology optimization
ultrawideband antennas (UWB)
Updating
Iterative method
Numerical method
Optimization
Adjoint field problem
Frequency band
Discretization
Wide band
Microstrip antennas
topology optimization
Multiple frequency
Gradient method
Coaxial cable
Finite difference time-domain analysis
Lossy medium
Algorithm
Ultra wide band
Time domain method
Simulation
finite-difference time-domain (FDTD)
Monopole antenna
Objective function
coaxial feed model
Maxwell equation
ultrawideband antennas (UWB)
ISSN:0018-926X, 1558-2221, 1558-2221
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Zusammenfassung:We introduce an approach to carry out layout optimization of metallic antenna parts. An optimization technique first developed for the optimization of load-bearing elastic structures is adapted for the purpose of metallic antenna design. The local conductivity values in a given region are used as design variables and are iteratively updated by a gradient-based optimization algorithm. Given a set of time-domain signals from exterior sources, the design objective is here to maximize the energy received by the antenna and transmitted to a coaxial cable. The optimization proceeds through a sequence of coarsely-defined lossy designs with successively increasing details and less losses as the iterations proceed. The objective function gradient is derived based on the FDTD discretization of Maxwell's equations and is expressed in terms of field solutions of the original antenna problem and an adjoint field problem. The same FDTD code, but with different wave sources, is used for both the original antenna problem and the adjoint problem. For any number of design variables, the gradient is evaluated on the basis of only two FDTD simulations, one for the original antenna problem and another for the adjoint field problem. We demonstrate the capability of the method by optimizing the radiating patch of both UWB monopole and microstrip antennas. The UWB monopole is designed to radiate over a wide frequency band 1-10 GHz, while the microstrip patch is designed for single and dual frequency band operation. In these examples, there are more than 20,000 design variables, and the algorithm typically converges in less than 150 iterations. The optimization results show a promising use of the proposed approach as a general method for conceptual design of near-resonance metallic antennas.
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ISSN:0018-926X
1558-2221
1558-2221
DOI:10.1109/TAP.2014.2309112