Design of Coplanar Waveguide-fed Planar Antennas for Wireless Local Area Network and Ultra-wideband Applications
Date Issued
2006
Date
2006
Author(s)
Hung, Kuan-Jung
DOI
en-US
Abstract
In this thesis, three novel coplanar waveguide (CPW)-fed planar antennas are presented. These proposed antennas can find applications in WLAN IEEE 802.11a/b/g and ultra-wideband (UWB) wireless systems.
First, design of a dual-band slot antenna with a pair of T-match stubs with applications for WLAN IEEE 802.11a/b/g uses is investigated. With the broadside radiations, the proposed antenna carries a stable in-band gain variation within 1 dB with peak gains around 3 dBi and 4.5 dBi in the 2.4-2.5 GHz and 5-6 GHz bands, respectively.
Secondly, a simple and compact UWB (3.1-10.6GHz) aperture antenna with extended band-notched designs is presented. The antenna consists of a rectangular aperture on a PCB ground plane and a T-shaped exciting stub. A compact aperture area of 13 x 23 mm2 is achieved. The correlation between the mode-based field distributions and radiation patterns is discussed. Three advanced band-notched (5-6 GHz) designs are also presented.
Thirdly, rectangular monopole antennas covering IEEE 802.11 b/g (2.4-2.5GHz) and UWB (3.1-10.6GHz) are designed with a notched band of 2.5-3.1 GHz. The wideband characteristics are achieved by tapering, technique. A pair of slits is inserted to the upper part of the monopole to obtain the notched band function. Compared to linear tapering method, the circular tapering method provides both wider bandwidth and better phase linearity.
At last, basic principles for characterizing UWB antennas in both frequency and time domains are summarized and measurement methods using network analyzers are also given. Characteristics of the developed rectangular aperture antenna and slit-loaded circular-tapered monopole antenna are then examined in time and frequency domain at certain plane cuts. The experimental results show slight pulse distortion, with goof fidelity values of 0.8 to 0.96 for the two proposed antennas.
Subjects
共面波導饋入
超寬頻
無線區域網路
天線
Coplanar Waveguide Fed
Ultra-wideband
Wireless Local Area Network
Antenna
Type
thesis
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