An Investigation Into the Gustafsson Limit for Small Planar Antennas Using Optimization

Shahpari, Morteza; Thiel, David V.; Lewis, Andrew

doi:10.1109/tap.2013.2290794

Cited by 21 publications

(22 citation statements)

References 32 publications

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“…Generalized absorption efficiencyη a was introduced in [23], [24] as the ratio of the total absorbed power to the total extinct power when illuminated by a wideband wave. This parameter was studied for the meander and Yagi antennas in [11], [25]. Calculation ofη a requires the numerical modeling of the receiving antenna across a broad frequency range.…”

Section: Numerical Resultsmentioning

confidence: 99%

The Impact of Reduced Conductivity on the Performance of Wire Antennas

Shahpari

Thiel

2015

IEEE Trans. Antennas Propagat.

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Low cost methods of antenna production primarily aim to reduce the cost of metalization. This might lead to a reduction in conductivity. A systematic study on the impact of conductivity is presented. The efficiency, gain and bandwidth of cylindrical wire meander line, dipole, and Yagi-Uda antennas were compared for materials with conductivities in the range 10 3 to 10 9 S/m. In this range, the absorption efficiency of both the dipole and meander line changed little, however the conductivity significantly impacts on radiation efficiency and the absorption cross section of the antennas. The extinction cross section of the dipole and meander line antennas (antennas that Thevenin equivalent circuit is applicable) also vary with radiation efficiency. From the point of radiation efficiency, the dipole antenna performance is most robust under decreasing conductivity. Antennas studied in this study were fabricated with brass and graphite. Radiation efficiency of the antennas were measured by improved Wheeler cap (IWC) method. Measurement results showed a reasonable agreement with simulations. We also measured the extinction cross section of the six fabricated prototypes.

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Section: Numerical Resultsmentioning

confidence: 99%

The Impact of Reduced Conductivity on the Performance of Wire Antennas

Shahpari

Thiel

2015

IEEE Trans. Antennas Propagat.

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“…Several antennas are compared with the bound in Fig. 15, see also [6,9,35,43,95]. The comparisons show that many antennas perform close to the bounds.…”

Section: Forward Scattering Sum Rulementioning

confidence: 88%

Physical Bounds of Antennas

Gustafsson¹,

Tayli²,

Cismasu³

2016

Handbook of Antenna Technologies

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Design of small antennas is challenging because fundamental physics limits the performance. Physical bounds provide basic restrictions on the antenna performance solely expressed in the available antenna design space. These limits offer antenna designers a-priori information about the feasibility of antenna designs and a figure of merit for different designs. Here, an overview of physical bounds on antennas and the development from circumscribing spheres to arbitrary shaped regions and embedded antennas are presented. The underlying assumptions for the methods based on circuit models, mode expansions, forward scattering, and current optimization are illustrated and their pros and cons are discussed. The physical bounds are compared with numerical data for several antennas.

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“…As a means of establishing a relationship for a broad range of antennas, the antennas investigated in Shahpari et al [18] were taken where possible (Figure 1 in [18], antennas a-f, h and i. Antennas g, j and k were excluded due to a feed point that is currently not possible in the new parametrisation). These antennas represent a variety of structures with minimum resonance frequencies ranging from 576 to 1757MHz.…”

Section: Validation Of Openems Resultsmentioning

confidence: 99%

“…An investigation of these limits for the special case of meander line antennas was conducted by Shahpari et al [18].…”

Section: Generalisation To Small Planar Antenna Designmentioning

confidence: 99%

An Investigation of the Performance Limits of Small, Planar Antennas Using Optimisation

Hettenhausen

Lewis

Thiel

et al. 2015

Procedia Computer Science

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This paper presents a generalised parametrisation as well as an approach to computational optimisation for small, planar antennas. A history of previous, more limited antenna optimisation techniques is discussed and a new parametrisation introduced in this context. Validation of this new approach against previously developed structures is provided and preliminary results of the optimisation are demonstrated and discussed. For the optimisation, a binary MultiObjective Particle Swarm Optimisation (MOPSO) is used and several methods for generating a viable initial population are introduced and discussed in the context of practical limitations computational simulations.

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An Investigation Into the Gustafsson Limit for Small Planar Antennas Using Optimization

Cited by 21 publications

References 32 publications

The Impact of Reduced Conductivity on the Performance of Wire Antennas

The Impact of Reduced Conductivity on the Performance of Wire Antennas

Physical Bounds of Antennas

An Investigation of the Performance Limits of Small, Planar Antennas Using Optimisation

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