Low-Loss Ceramics in Mobile Communications

Wakino, Kikuo; Tamura, Hiroshi; Sujan, G.K.

doi:10.1016/b978-0-12-803581-8.01806-3

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The Effective Current For An Infinite Antenna1

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2020

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“…6. When moving further away from the z-axis, with a In most dielectrics at microwave frequencies, one typically encounters tan δ ≪ 1 (see e.g., [35,36]) while studies in conducting media report tan δ ∼ 1 in the MHz range [37,38].…”

Section: The Effective Current For An Infinite Antennamentioning

confidence: 99%

Alleviating oscillatory approximate-kernel solutions for cylindrical antennas embedded in a conducting medium: a numerical and asymptotic study

et al. 2020

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We alleviate the unnatural oscillations occurring in the current distribution along a linear cylindrical antenna center-driven by a delta-function generator and embedded in a conducting medium. The intensely fluctuating current arises as a small-z0 asymptotic (or numerical) solution of the classical integral equations of antenna theory, for a cylindrical dipole of infinite (or finite) length, where z0 is the discretization length. To alleviate the oscillations, we employ an appropriate effective current further to the recent remedy of oscillations attained for a perfectly conducting linear cylindrical antenna of finite length for the case where the surrounding medium is free space. We derive asymptotic formulas for the infinite antenna, which are then put to numerical test. Furthermore, we point to the physical significance of the effective current whose function transcends a mere computational device.

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