Characteristic Modes of Dipole Arrays

Lonsky, Tomas; Hazdra, Pavel; Kracek, Jan

doi:10.1109/lawp.2018.2828986

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…We plan to use the multiple goal pattern algorithm to implement pattern steering. Furthermore, using the theory of characteristic modes [15], we intend to calculate the feed intensities required at the individual elements to generate the optimal current distribution calculated by the algorithm.…”

Section: Discussionmentioning

confidence: 99%

Antenna Array Pattern Synthesis Using an Iterative Method

2020

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In this article, we investigate a novel iterative antenna array synthesis method. The method is based on the iterative addition of antenna array elements. After defining the synthesis algorithm, we prove that the discrepancy between the goal and the synthesized pattern converges to the theoretical lower bound in the sense of a certain norm. The algorithm is also extended to iteratively replace already placed elements and for the synthesis of multiple goal patterns with the same array geometry but with different excitations. Some numerical examples are shown to illustrate the convergence properties of the proposed method. Possible applications include circularly polarized patterns, since the algorithm can handle the rotation as well as translation of the antenna elements.

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Section: Discussionmentioning

confidence: 99%

Antenna Array Pattern Synthesis Using an Iterative Method

2020

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“…is a mutual radiated power of the m-th and n-th elements and p mn is its normalisation to the currents I m and I n . Consequently, the directivity D (1) takes a compact matrix form using (6), (7), (10), (11) [18,19,26,27]…”

Section: Directivity In Terms Of Source Currentsmentioning

confidence: 99%

“…V(θ, ϕ, s) = e − js/2sinθcosϕ f θ, ϕ e js/2sinθcosϕ f θ, ϕ (29) f θ, ϕ = sin θ (30) and f is a normalised far field pattern of the elementary dipole. Thus, the currents I opt (27) can be written with the help of the previously found matrix p as…”

Section: Optimal Excitation and Superdirectivitymentioning

confidence: 99%

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On end‐fire super directivity of arrays of two elementary dipoles and isotropic radiators

Hazdra

Kracek

Lonsky

2019

IET Microwaves, Antennas & Propagation

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The concept of source currents of a radiating source can be employed to express its directivity in some particular cases analytically. For an antenna array, this concept can be extended to the concept of a generalised directivity based on self‐ and mutual radiation intensities, self‐ and mutual radiated powers and excitation currents of array elements. These approaches were applied to examples of the array of two elementary dipoles and the array of two isotropic radiators. Particularly, the evaluation of the directivity of the end‐fire arrays, which are of special attention due to superdirective properties, was treated. Novel closed‐form expressions for the directivity of these arrays with out‐of‐phase excitation were derived. It was observed that the end‐fire directivity can be further enhanced by optimising the excitation currents of the arrays. Their optimal phase difference and corresponding increased directivity were also found analytically. The results were validated by a full‐wave simulator.

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