Compact Grounded Parasitic Antennas
Date Issued
2007
Date
2007
Author(s)
Lin, Chih-Hao
DOI
zh-TW
Abstract
This thesis presents several novel designs of the grounded parasitic antennas with applications for Wireless Local Area Network (WLAN) systems. In the first half of this thesis, we investigate a previously designed grounded parasitic antenna and propose an improved design to enhance the manufacturing simplicity and the impedance matching performances. Fed by a microstrip line, the antenna uses the T-shaped driven monopole stub on the top layer to excite the inverted-L-shaped parasitic element on the backed layer, omitting the via hole complexity. We extend this structure to a dual-band dual-polarized diversity antenna for mini-PCI application. We also investigate the envelope correlation between two branches of the diversity antenna. In the second half of this thesis, two new kinds of grounded parasitic antenna are presented. Fed by a microstrip transmission line, the antenna contains a T- or double T-shaped driven stub on the top layer and a grounded parasitic element on the bottom layer. We investigate the resonant modes of the antenna through the current distribution and systematic parametric study on some key dimensions. The proposed antennas are successfully designed, implemented, and measured. The antennas perform dual band resonances with sufficient bandwidth covering all the frequency bands of IEEE 802.11a/b/g WLAN applications. In addition, the monopole-like radiation patterns make the proposed antennas very suitable for indoor wireless communication system. At last, we also extend the structure with T-shaped driven stub case to a dual-band dual-polarized diversity antenna for further analysis.
Subjects
無線區域網路
寄生接地天線
雙頻天線
印刷電路板天線
天線分集
WLAN
grounded parasitic antennas
dual-band antennas
printed antennas
antenna diversity
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R94942002-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):f6b7b0c387d9cc5c5c441ee2e97a423b