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Miniaturization of Ultra-Wideband Horizontally-Polarized Omnidirectional Vivaldi Antenna Arrays using Non-Uniform Elements | IEEE Journals & Magazine | IEEE Xplore

Miniaturization of Ultra-Wideband Horizontally-Polarized Omnidirectional Vivaldi Antenna Arrays using Non-Uniform Elements

Publisher: IEEE

Abstract:

In this paper, two new methods are proposed for miniaturizing planar ultra-wideband horizontally-polarized omnidirectional Vivaldi antenna arrays. In the first method, th...View more

Abstract:

In this paper, two new methods are proposed for miniaturizing planar ultra-wideband horizontally-polarized omnidirectional Vivaldi antenna arrays. In the first method, the order of a power divider is decreased by means of feeding two neighboring Vivaldi antenna elements in series as a sub-array, or termed as a double-Vivaldi antenna element and thus the layout area required for a feeding network is reduced. Therefore, the layout problem of a conventional circular Vivaldi antenna array with a confined size is solved. Meanwhile, non-uniform elements with different taper rates are used to solve the in-band peak gain variation that is caused by a disc monopole mode. In this way, a non-uniform series-fed double-Vivaldi antenna array is presented. In the second method, a folded loop structure is introduced for an electrical size reduction of the aforementioned array. As a result, a lower resonant frequency is obtained. Measured results show that the final design has advantages of a large operating bandwidth, a small footprint of π × (0.284λ max ) 2 and a high gain. Besides, a clear design flowchart is given.
Published in: IEEE Transactions on Antennas and Propagation ( Early Access )
Page(s): 1 - 1
Date of Publication: 27 November 2024

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Publisher: IEEE

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