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Journal ArticleDOI

Reflection coefficient and reflected power on a lossy transmission line

R.J. Vernon, +1 more
- Vol. 57, Iss: 1, pp 101-102
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TLDR
In this paper, it was shown that the magnitude of voltage reflection coefficient |ρ| occurring in transmission line theory can exceed unity even for a passive load, and the necessary and sufficient conditions for such an occurrence were investigated.
Abstract
It is shown that the magnitude of voltage reflection coefficient |ρ| occurring in transmission line theory can exceed unity even for a passive load, and the necessary and sufficient conditions for such an occurrence are investigated. Expressions for the maximum values of |ρ| obtainable for a line of a given characteristic impedance, and the load impedance necessary to produce this value of |ρ|, are given. It is shown that the separation of the time-averaged power into the sum of the so-called incident and reflected powers has a limited range of validity and that when such a separation is physically meaningful, the fact that the magnitude of the reflected power is less than the incident is quite evident, as is to be expected for a passive load.

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Journal ArticleDOI

Broadband optical absorption enhancement through coherent light trapping in thin-film photovoltaic cells.

TL;DR: It is shown that optical absorption in thin-film photovoltaic cells can be enhanced by inserting a tuned two-component aperiodic dielectric stack into the device structure and optimizing the spectral photon density-of-states to enhance the absorption of the active layer across its absorption spectrum.
Journal ArticleDOI

Boundary Effects on the Determination of Metamaterial Parameters From Normal Incidence Reflection and Transmission Measurements

TL;DR: In this article, a method is described for the determination of the effective electromagnetic parameters of a metamaterial based only on external measurements or simulations, taking boundary effects at the interfaces between a conventional material and metammaterial into account.
Journal ArticleDOI

Understanding the HERA Phase i receiver system with simulations and its impact on the detectability of the EoR delay power spectrum

Nicolas Fagnoni, +72 more
TL;DR: In this paper, the authors combine detailed electromagnetic and electrical simulations in order to model the chromatic effects of the instrument, and quantify its frequency and time responses, in particular, the effect of the analogue receiver, transmission cables, and mutual coupling.
Journal ArticleDOI

A 3-D Smith Chart Based on the Riemann Sphere for Active and Passive Microwave Circuits

TL;DR: In this article, a spherical 3-D Smith Chart suitable for representing both active and passive microwave circuits is proposed, where the extended reflection coefficient plane is transformed into the surface of the unit sphere.
Journal ArticleDOI

On Impedance Matching in a Power-Line-Communication System

TL;DR: It is shown that optimal impedance matching shall maximize the amplitude of the signal voltage at the channel input port, assuming broad-band communication.
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