Application of the minimum scattering antenna theory to mismatched antennas

Rogers, P.G.

doi:10.1109/tap.1986.1143747

Cited by 25 publications

(6 citation statements)

References 11 publications

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“…It is just part of the power radiated away from the system. This is explicitly revealed by (8). This result is an outcome of the fact that the scattered field does not exist on its own and it is not a measurable quantity, but only is just a part of the total field.…”

Section: Geometry and Definitionsmentioning

confidence: 92%

See 1 more Smart Citation

Circuit and Multipolar Approaches to Investigate the Balance of Powers in 2d Scattering Problems

Liberal¹,

Ederra²,

Gonzalo³

et al. 2013

PIER

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Abstract-Circuit and multipolar approaches are presented to investigate the correlation between absorption and scattering processes in 2D problems. This investigation was inspired by earlier works of R. E. Collin, which pointed out deficiencies of the Thévenin/Norton circuit models to evaluate the scattered and absorbed powers associated with receiving antennas and, thus, encouraged research on new analytical tools to address these problems. Power balance results are obtained with both circuit and multipolar approaches that are fully consistent. This analysis serves to illustrate how the correlation between absorption and scattering processes results in upper bounds for their power magnitudes, as well as stringent design trade-offs in both far-field and near-field source and scattering technologies.

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Section: Geometry and Definitionsmentioning

confidence: 92%

“…Inspired by this work, the topic would be investigated in the 60's under the label of minimum scattering antennas [5][6][7][8], mostly based on a scattering matrix approach. It was explored further in conjunction with antenna arrays and frequency selective surfaces, and their radar cross-section properties.…”

Section: Introductionmentioning

confidence: 99%

Circuit and Multipolar Approaches to Investigate the Balance of Powers in 2d Scattering Problems

Liberal¹,

Ederra²,

Gonzalo³

et al. 2013

PIER

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“…The normalised current densities j m and j n are usually expressed as vectors j m = j mx , j my , j mz and j n = j nx , j ny , j nz in the Cartesian coordinates similarly as the unit vector r 0 = [sin θcos ϕ, sin θsin ϕ, cos θ], which determines the direction of radiation. This leads to the expression of (9) as (21) and (42) can be written as…”

Section: Appendixmentioning

confidence: 99%

“…Note that the elementary dipole and isotropic radiator belong to a class of so-called canonical minimum scattering antennas (CMSA), i.e. single-mode antennas [20,21]. They have the important property that the far field of a standalone antenna is identical with the far field of the same antenna embedded as an element of an array and influenced by its other open-circuited elements.…”

Section: Introductionmentioning

confidence: 99%

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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“…The concept of a "minimum scattering antenna" (MSA) provides us with an appropriate guideline for selecting the scattering antenna. Conceptually, an MSA is invisible to electromagnetic fields when it is left open-circuited (Rogers, 1986) or connected to an appropriate reactive load (Iigusa et al, 2006). The horn and microstrip antennas do not fulfill MSA requirements due to their bulky physical structures and large ground plane, respectively, which cause significant structural-mode scattering regardless of antenna termination.…”

Section: Antenna Typementioning

confidence: 99%