Summary

International Symposium on Antennas and Propagation

2010

Session Number:3TA3

Session:

Number:3TA3-5

Integrated Dual-Dipole Antenna for WiMax Operation in the Mini Laptop

Shun-Yun Lin,  Yuan-Chih Lin,  Jian-Rong Wu,  Wen-Shyang Chen,  

pp.-

Publication Date:2010/11/23

Online ISSN:2188-5079

DOI:10.34385/proc.52.3TA3-5

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Summary:
To meet the requirements of omnidirectional radiation, internal fabrication, and wideband/multi-band operation for laptop wireless, many kinds of antenna structure have been disclosed [1-3]. To achieve wideband/ multi-band operation, the techniques, including combination of the first two modes [1], multiple radiation elements [2], and introduction of additional resonant mode [3], were disclosed. Moreover, to fit in with the limited space of the panel edge for best integration [4], miniaturized antenna, especially the low profile, is critically demanded. The bended structures [1], quarter wavelength module [2-3] were used to reduce the occupied space. However, the antenna profile of most designs is too large to be suitable with the modern mini-laptop [4]. Also, note that all the mentioned patch antenna, monopole antenna, and slot antenna achieve the omnidirectional radiation by taking into that the ground plane is one portion of radiator. Therefore, remarkable variations in antenna performances, such as operation band, input impedance, and radiation characteristics, usually occur through the varied ground plane as the antenna integrates into the laptop. Comparatively, the horizontal polarized dipole antenna, which has properties of low profile, inherently omnidirectional radiation, and balance structure to dispense from the ground plane noise, is seen to be a good candidate for laptop wireless. To improve the inherent defects narrow bandwidth, additional modes or the high order modes to the half-wavelength mode were introduced by adding parasitic elements [5], integrated balun [6], and using offset feed [7]. In this article, a novel design of an integrated dual-dipole antenna for mini-laptop is proposed. A prototype that operates in the WiMax 3.5 GHz system was developed. The antenna occupies a dimension of 30×5 mm2 and prints on an FR4 no-ground dielectric substrate of 0.4 mm thickness. The whole structure divides into a larger dipole and a shorter dipole, and respectively generates the half-wavelength mode. In this study, the two resonant modes are combined to 740 MHz (3.12 ? 3.86 GHz) in bandwidth. Design considerations of the proposed antenna are described in the paper, and results for the fabricated prototype are presented and discussed.