On Spatial Visualization of Mutual Coupling With Applications to Small Embedded Antennas

Jonsson, B. L. G.; Lundgren, Johan; Malmström, Johan

doi:10.23919/eucap53622.2022.9769525

Cited by 3 publications

(10 citation statements)

References 19 publications

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“…(26) Here we use the well-known vector identity 2 . Therefore, we get the equation connecting winertia and H as follows:…”

Section: Connection Of Instantaneous Helicity With Em Inertia and Lag...mentioning

confidence: 99%

“…• In the "coupling density" calculation using reaction theorem, there is a requirement of mutual impedance calculation and associated normalization [2], [8]. However, the proposed technique here is purely based on near-zone field components and energy density, without need for any circuit parameter evaluation.…”

Section: B Mom Computed Spatial Distribution Of Frequency Domain Reac...mentioning

confidence: 99%

“…Mutual coupling is a fundamental parameter for characterization of multi-port antenna arrays (both in transmit and receive modes) [1]. Traditionally, port-to-port mutual coupling in antenna arrays can be estimated through mutual impedance and S-parameters using modern-day full-wave computational electromagnetic (CEM) solvers, and measured by VNAs (vector network analyzers) [1], [2]. However, identifying spatial regions in the antenna near-field, that contribute constructively or destructively to these mutual impedances or S-parameters, can be extremely beneficial to antennas and communication system engineers [2].…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, port-to-port mutual coupling in antenna arrays can be estimated through mutual impedance and S-parameters using modern-day full-wave computational electromagnetic (CEM) solvers, and measured by VNAs (vector network analyzers) [1], [2]. However, identifying spatial regions in the antenna near-field, that contribute constructively or destructively to these mutual impedances or S-parameters, can be extremely beneficial to antennas and communication system engineers [2]. With this motivation, there has been significant interest in visualization of mutual coupling in multiantenna systems using innovative methods involving energy parcels, reaction theorem and Poynting streamlines [2]- [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, identifying spatial regions in the antenna near-field, that contribute constructively or destructively to these mutual impedances or S-parameters, can be extremely beneficial to antennas and communication system engineers [2]. With this motivation, there has been significant interest in visualization of mutual coupling in multiantenna systems using innovative methods involving energy parcels, reaction theorem and Poynting streamlines [2]- [8].…”

Section: Introductionmentioning

confidence: 99%

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Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Sarkar¹,

Antar²

2023

Preprint

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<p>In this letter, we provide new insights into the mutual coupling between antennas, using spatial distribution of near-field reactive Helicity and period-averaged EM Lagrangian density. First, we analytically show that reactive Helicity (given by the real part of complex Helicity) in frequency domain always becomes zero in the far-field region of generic linearly and circularly polarized antennas. Furthermore, we introduce the concept of ‘instantaneous Helicity’ (analogous to instantaneous Poynting vector) to calculate reactive Helicity for antennas excited by arbitrary time-domain signals (eg. short-duration pulses). We analytically demonstrate the fundamental connection between this instantaneous Helicity, EM inertia density and EM Lagrangian density. Finally, using MoM-based MATLAB Antenna Toolbox, we compute the distribution (contour-plots) of normalized reactive Helicity and period-averaged Lagrangian density around a two-port system of thin-wire dipoles in frequency domain, revealing complex near-field inter-element interactions. Such visualization of mutual coupling via reactive Helicity and period-averaged EM Lagrangian density can enable antenna array designers to go beyond the traditional S-parameter approach, and identify regions containing near-zone non-TEM fields and non-propagating energy density, which may contribute constructively/destructively to the port-to-port mutual coupling. </p>

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“…(26) Here we use the well-known vector identity 2 . Therefore, we get the equation connecting winertia and H as follows:…”

Section: Connection Of Instantaneous Helicity With Em Inertia and Lag...mentioning

confidence: 99%

Section: B Mom Computed Spatial Distribution Of Frequency Domain Reac...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Sarkar¹,

Antar²

2023

Preprint

View full text Add to dashboard Cite

show abstract

Antenna Mutual Coupling in Near-Field: Insights Using EM Lagrangian Density and Complex Helicity

Sarkar

Antar

2023

Antennas Wirel. Propag. Lett.

View full text Add to dashboard Cite

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Sarkar¹,

Antar²

2023

Preprint

View full text Add to dashboard Cite

show abstract

On Spatial Visualization of Mutual Coupling With Applications to Small Embedded Antennas

Cited by 3 publications

References 19 publications

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Antenna Mutual Coupling in Near-Field: Insights Using EM Lagrangian Density and Complex Helicity

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

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