Small antenna location synthesis using characteristic modes

Radiation efficiency is an important parameter, especially for electrically small antennas. It can be computed directly from the method-of-moments impedance matrix, and also more generally by employing modal decomposition through characteristic modes. This advantageously enables us to study separately the effect of the radiating shape and the feeding. The proposed method does not require any modification of the Electric Field Integral Equation implementation. A perfectly conducting antenna is considered as the only input to the modal decomposition. The conductive losses are taken into account once the surface currents are calculated. Good agreement is observed for the proposed treatment of the skin effect. Verification of the method is numerically performed on an fractal antenna, a thinstrip Sierpinski curve of various iterations. A full-wave software FEKO with implemented IBC is used for comparison purposes.

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“…The Sierpinski antenna of 2nd iteration was decomposed into the characteristic modes. The eigenvalues in terms of eigenangles [27] δ…”

Section: Numerical Examples -Sierpinski Curvementioning

confidence: 99%

A method for evaluating radiation efficiency based on a modal approach

Čapek

Eichler

Hazdra

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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“…Another representation of n λ is n α which is called Characteristic Angle [7] and is easier to deal with. The formulation is as follows:…”

Section: Characteristic Modes Theoremmentioning

confidence: 99%

A novel MIMO antenna design using Characteristic Modes

Seyyedrezaei

Dadashzadeh

Araghi

2012

2012 15 International Symposium on Antenna Technology and Applied Electromagnetics

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A novel design of Multi-Input Multi-Output (MIMO) antenna is presented. Pattern and polarization diversity is created using Characteristic Modes (CM) theorem and reduces the envelope correlation and isolation between the ports. So a printed structure consists of two circular patches is proposed for MIMO application. This structure is fed by two slotted coupled feeds configuration. The proposed antenna has been simulated in Ansoft HFSS software and simulation results are presented.

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“…HE Theory of Characteristic Modes (TCM) [1][2] has demonstrated to be really helpful for the analysis and design of different types of antennas, such as small antennas [3][4], wire antennas [5] [6], planar patches and monopoles [7][8], vehicle mounted antennas [9][10], handset antennas [11]- [13], or dielectric antennas [14] insight they provide of the resonances and radiating behavior of arbitrarily shaped metallic bodies. In the last years, the number of publications concerning the application of this modal theory to the design of antennas has increased exponentially.…”

Section: Introductionmentioning

confidence: 99%

Design Guidelines for the Excitation of Characteristic Modes in Slotted Planar Structures

Antonino‐Daviu

Cabedo-Fabrés

Sonkki

et al. 2016

IEEE Trans. Antennas Propagat.

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Abstract-This paper provides some design guidelines for the excitation of broadband slotted planar antennas, addressing key issues such as coupling, symmetries and multiple feeding. The Theory of Characteristic Modes is used to identify the collection of current modes that exists on these structures, dealing to a valuable understanding of the radiating mechanisms and allowing a more controlled design process. Modal analysis of a circular aperture cut on a finite square ground plane is presented in order to demonstrate that an optimum choice of the feeding mechanism can be made according to the current distribution of the desired modes. Based on the information yielded by this modal analysis, a capacitive-coupled dual-feed circular aperture antenna is presented. This antenna takes advantage of the symmetries of the characteristic currents by making use of multiple feeding, in order to excite only some particular modes. Usage of commonly-fed and differentially-fed configurations enables an increased control of the excitation of modes in the structure. Characteristic modes analysis of the antenna including the feeding structures is presented, showing the influence of the feeding lines in the performance of this type of antennas. A prototype of the antenna has been fabricated and measured. Simulated and measured results are presented, being in good agreement.

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Small antenna location synthesis using characteristic modes

Cited by 92 publications

References 3 publications

A method for evaluating radiation efficiency based on a modal approach

A method for evaluating radiation efficiency based on a modal approach

A novel MIMO antenna design using Characteristic Modes

Design Guidelines for the Excitation of Characteristic Modes in Slotted Planar Structures

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