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Low-profile folded-monopole antenna with unbalanced composite right-/left-handed transmission line

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PROJECT TITLE :

Low-profile folded-monopole antenna with unbalanced composite right-/left-handed transmission line

ABSTRACT :

An occasional-profile folded-monopole antenna with high radiation efficiency is presented, consisting of only 2 unbalanced composite right-/lefthanded transmission line unit cells. The same??odd mode analysis shows that the even mode necessary to realise the folded-monopole result prevails at the zeroth-order frequency, determined by the shunt resonance of the unbalanced unit cell. Loading a spiral inductor in each unit cell's top patch will keep the antenna in a low profile at a relatively low selfresonant frequency, and a considerable increase in the radiation resistance is generated consistent with the multiple folded monopole theory, enabling the antenna to be similar temperament to fifty V without adopting any external matching network. A prototype antenna of λ/ten x λ/ 20 x λ/10, operative at 3.zero GHz, has been fabricated and measured, which can achieve radiation efficiency of higher than 90percent and fully omnidirectional monopole-type radiation pattern.


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Low-profile folded-monopole antenna with unbalanced composite right-/left-handed transmission line - 4.6 out of 5 based on 54 votes

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