Trends and bounds in RF coupling to a wire inside a slotted cavity

Lee, K.S.H.; Yang, Fan

doi:10.1109/15.155825

Cited by 24 publications

(23 citation statements)

References 5 publications

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“…On the contrary, if the generator becomes purely reactive so that |χ| → +∞ (R g → 0, E g and X g being assumed constant and non null), then the load factor goes to zero, whatever the load impedance (supposing the load is lossy). In any case, the load factor compensates the increase of P a , which is proportional to χ and thus becomes infinitely large [19]. In that way, the power dissipated in the load remains always finite even if the available power tends to infinity.…”

Section: Power Transfer Between a Generator And A Loadmentioning

confidence: 98%

“…The concepts of available power and load factor for radiating sources and scatterers are introduced and discussed. As already shown in [16][17][18][19], those concepts are relevant to derive trends and bounds in power absorption mechanisms, when the problem can be modeled with a set of decoupled circuits. The interest of these quantities is here briefly highlighted and illustrated for simple source-scatterer configurations.…”

Section: Introductionmentioning

confidence: 98%

“…In the electromagnetic case, equations linking V and I to a and b are different, as shown by (18) and (19). Applied to the single circuit case of Figure 1a, these formulas are such that:…”

Section: Appendix a Derivation Of Expressions (7) And (22) Of The Lomentioning

confidence: 99%

“…Despite the strong link existing between the circuit and electromagnetic problems, it is worth noting that, the equivalent circuit/junction model verifies equations (18) and (19), which are generally different from (9) and (10), since Z + n and Z − n are not generally equal, except when R tends to infinity. This difference impacts on many formulas resulting from (18) and (19).…”

Section: Power Transfer From An Electromagnetic Source To a Lossy Scamentioning

confidence: 99%

“…This difference impacts on many formulas resulting from (18) and (19). For instance, the expressions of the power dissipated in the junction J, the load factor, or the reflection coefficient are modified with respect to the classical circuit case (see Appendix A).…”

Section: Power Transfer From An Electromagnetic Source To a Lossy Scamentioning

confidence: 99%

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Analytical Lower and Upper Bounds of Power Absorption in Near-Field Regions Deduced From a Modal-Based Equivalent Junction Model

Derat¹,

Bolomey²

2006

PIER

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Abstract-Due to the proximity of mobile phones to users' heads and resulting interrogations on potential health effects, as well as to the development of promising medical applications of electromagnetic waves such as non-invasive RF Hyperthermia treatments, near-field interactions between antennas and lossy scatterers, such as human beings, have been a topic of growing interest over the last decade. More generally, for various kinds of radiating sources and targets, much scientific effort has been done to answer the following question in particular configurations: what is the minimal/maximal power that can be absorbed in a lossy object located in the reactive field region of an antenna? The aim of this paper is to propose a general and analytical solution to this problem, applicable to any sourcescatterer system. To this purpose, a method, allowing to describe power deposition mechanisms in near-field regions, is introduced. This approach is based on an equivalent junction/circuit model which is shown here to result from an appropriate modal expansion of the radiated field. The dual interpretation of this model in terms of localized circuit and lumped junction is used to demonstrate how trends and bounds in power absorption phenomena can be derived. Firstly, the analogy with the microwave circuit theory provides the concepts of available power and load factor for electromagnetic fields, which allow to highlight the parameters influencing power dissipation and to analyze consequent trends. Secondly, the junction matrix 22 Derat and Bolomey formalism is used to obtain analytical lower and upper bounds of the power absorbed in a lossy object, located in the near field region of any radiating source. Those bounds give a clearer insight of the relationship between the total radiated power due to the antenna and the minimal or maximal power potentially dissipated in any scatterer exposed to such a radiated field. An example of bounds in a simple source-load configuration is finally provided, showing the link, to be further investigated, between the near-zone electric-field pattern of the antenna and the total dissipated power. This example also suggests that the power dissipated in a given object can be rapidly increased or reduced as the modal complexity of the source increases.

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Section: Power Transfer Between a Generator And A Loadmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

“…In the electromagnetic case, equations linking V and I to a and b are different, as shown by (18) and (19). Applied to the single circuit case of Figure 1a, these formulas are such that:…”

Section: Appendix a Derivation Of Expressions (7) And (22) Of The Lomentioning

confidence: 99%

Section: Power Transfer From An Electromagnetic Source To a Lossy Scamentioning

confidence: 99%

Section: Power Transfer From An Electromagnetic Source To a Lossy Scamentioning

confidence: 99%

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