Shape Optimization of Wideband Antennas for Microwave Energy Harvesters Using FDTD

Author

Mori, Takuya ; Murakami, Ryo ; Sato, Yuki ; Campelo, Felipe ; Igarashi, Hajime

Author_Institution

Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo, Japan

Volume

51

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1

Lastpage

4

Abstract

This paper presents parameter and topology optimizations of wideband antennas for microwave energy harvesters based on finite difference time-domain computations. The antenna shapes are optimized to reduce return losses in a specific frequency band using micro-genetic algorithm. The shape parameters of a two-arm planar spiral antenna are optimized. In addition, the topology optimization is performed using normalized Gaussian network, where spatial symmetries are assumed. It is shown that the return losses of the optimized antennas are <;-10 dB from 1 to 2 GHz in which they have isotropic directivity.

Keywords

Gaussian processes; broadband antennas; energy harvesting; finite difference time-domain analysis; genetic algorithms; microwave antennas; planar antennas; spiral antennas; FDTD; finite difference time-domain computation; frequency 1 GHz to 2 GHz; microgenetic algorithm; microwave energy harvester; normalized Gaussian network; shape optimization; spatial symmetry; two-arm planar spiral antenna; wideband antenna; Broadband antennas; Finite difference methods; Optimization; Shape; Time-domain analysis; Topology; Energy harvesting; finite difference time-domain (FDTD) method; group theory; normalized Gaussian network (NGnet); topology optimization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2359677

Filename

7093527