The Method of Auxiliary Sources (MAS) — Solution of Propagation, Diffraction and Inverse Problems Using MAS

Zaridze, R.; Bit-Babik, G.; Tavzarashvili, K.; Uzunoglu, N.K.; Economou, D.

doi:10.1007/978-3-642-59629-2_3

Cited by 27 publications

(37 citation statements)

References 2 publications

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“…In the following analysis a combination of the Green's function method and the Method of Auxiliary Sources [10] is utilized, to calculate the fields, by evaluating the current distribution on the surface of the antenna and determining the input impedance of the structure at its feeding point. The Green's function of the structure is computed as the response of the dielectric hemisphere to an embedded vertical polarized elementary dipole antenna excitation.…”

Section: Figurementioning

confidence: 99%

“…Considering a unit dipole moment placed at a position r inside the sphere and using a spherical coordinate system with its origin placed at the center of the dielectric sphere, the dyadic Green's function at an arbitrary point r inside the sphere is given by [10,11]: the use of Bessel and Hankel of the 2nd kind (j n (kr) − j · y n (kr)) functions respectively, whereas k 1 appearing in the Green's function, is the wavenumber k 1 = k 0 · √ ε 1 of the dielectric medium.…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…Implementation of a hybrid semi-analytical technique, based on the combination of Green's function theory with the Method of Auxiliary Sources (MAS) [10], provides an accurate solution. The DR configuration is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a Dielectric Resonator Antenna by Applying a Combined Semi-Analytical Method and Simulation

Betzios

Karanasiou

Uzunoglu

2007

Journal of Electromagnetic Waves and Applications

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The radiation properties of a hemispherical dielectric resonator, consisting of a monopole antenna placed in a dielectric hemisphere is theoretically examined. A method based on the combination of Green's function theory, in conjunction with the Method of Auxiliary Sources (MAS), is used to solve analytically and calculate the electromagnetic field at any arbitrary point of the structure. The Green's function theory is used to calculate the response of the hemisphere to an excitation consisting of an elementary dipole placed inside its volume. The Method of Auxiliary Sources (MAS) is applied by distributing a set of elementary dipoles along the axis of the antenna probe. A number of matching points, lying on the surface of the cylindrical antenna, are used to calculate the dipole moments of the auxiliary sources, by imposing appropriate boundary conditions. Additionally, the input impedance and the current distribution on the antenna are also derived through application of the above-mentioned methodology. The numerical results are finally validated by comparing them with the simulation results of the relevant configuration elicited using a commercial simulation FEM tool.

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Section: Figurementioning

confidence: 99%

Section: Mathematical Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of a Dielectric Resonator Antenna by Applying a Combined Semi-Analytical Method and Simulation

Betzios

Karanasiou

Uzunoglu

2007

Journal of Electromagnetic Waves and Applications

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“…The E field is orthogonal to the cross-sectional plane. We constructed an algorithm for the solution of this problem similar to that presented in [2] (see fig 3), but considering that the boundary condition must also take into account Once the auxiliary currents are determined, all electromagnetic quantities of interest can be calculated. Particularly: radiation pattern, total input and output power, absorbed power, input impedance (its real and image parts), radiation efficiency, near field distribution, front-to-back radiation ratio, etc.…”

Section: The Mas Algorithmmentioning

confidence: 99%

“…The radiation beam of such directive antenna can be steered by appropriate current amplitude/phase combinations of the radiating elements. The investigation of the radiation parameters of the present antenna has been canied out using the Method of Auxiliary Sources (MAS) [2], in its 2-D formulation, applied to the structure depicted in fig. 1.…”

Section: Problem Statementmentioning

confidence: 99%

The method of auxiliary sources applied to the analysis of adaptive transverse resonant antennas

Bit-Babik

Tavzarashvili²,

Bijamov³

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in Conjunction With: USNC/URSI National Radio

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The beam-steering capability of compact antennas presenting transverse resonances could be employed in wireless applications. Adaptive beam-steering arrays can improve communication reliability and energy efficiency. The 2-D Method of Auxiliary Sources is employed to study the performance of a compact size transverse resonant antenna composed of wire radiators embedded in a dielectric substrate and backed by a conductive surface. In this particular case, the antenna is capable of scanning and changing the width of the main lobe of its pattern, as well as reduce the back radiated energy. Attention is paid to energy absorption by the user$ body, as well as to EMC issues with body-worn electronic devices. Problem StatementMany of the existing antennas employed in wireless communications do not satisfy requirements of coverage and efficiency dictated by the modem wireless communications applications. For instance, the quasi-omnidirectional azimuth pattern of cellular phone antennas tend to satisfy the requirements in terms of coverage, but at the same time produces a drastic reduction in efficiency due to the close proximity of the userS head. The strength of the electromagnetic field near the antenna relatively high, comprising both reactive and radiated components. In this case, there is no use in radiating RF power in all directions, when the connection of the phone with the base station is established [l]. The directional radiation is enough for cominunication purposes, and would improve energy efficiency.In this work, we considered an antenna formed by an array of three wire radiators embedded in a substrate layer backed by a reflecting surface. The radiation beam of such directive antenna can be steered by appropriate current amplitude/phase combinations of the radiating elements. The investigation of the radiation parameters of the present antenna has been canied out using the Method of Auxiliary Sources (MAS) [2], in its 2-D formulation, applied to the structure depicted in fig. 1. It was shown that the MAS is an efficient tool for the investigation of such kind of problems.Because of strong electromagnetic interaction between the antenna and the user and the variable distance between them, it is impossible to obtain a good matching of the antenna for all operating positions. The back plane would provide a certain degree of decoupling between the antenna and the body and improve energy efficiency. The directional beam of the antenna and the steering capability would enhance a reliable connection with the base station in a typical scattering environment.

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Bibliography for Chapters 1–6

Katsenelenbaum¹

2003

Electromagnetic Fields – Restrictions and Approximation

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The Method of Auxiliary Sources (MAS) — Solution of Propagation, Diffraction and Inverse Problems Using MAS

Cited by 27 publications

References 2 publications

Analysis of a Dielectric Resonator Antenna by Applying a Combined Semi-Analytical Method and Simulation

Analysis of a Dielectric Resonator Antenna by Applying a Combined Semi-Analytical Method and Simulation

The method of auxiliary sources applied to the analysis of adaptive transverse resonant antennas

Bibliography for Chapters 1–6

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