Microstrip-Fed Quasi-Yagi Antenna for Dual Frequency Operation
Date Issued
2008
Date
2008
Author(s)
Cheng, Jen-Chieh
Abstract
The original and modified designs of the microstrip-fed quasi-Yagi antennas for dual frequency operation are proposed in this thesis. They can be widely applied to point to point wireless communications in modern life. The two compact and double-layered dual band quasi-Yagi antennas fabricated on the FR4 substrate have end-fire radiation patterns within their two frequency bands. Both two structures consist of two arms of two driving dipoles connected separately to two microstrip sections, a director element, and a truncated ground plane as a reflector element. For WLAN application of IEEE 802.11a/b/g, the original design measures the bandwidths of 3.6 % with gain variations of 3.6 – 4.7 dBi in the lower band and 27.6% with 5.2 – 6.2 dBi in the upper band. The modified design measures the bandwidth of 9.2 % with gain variations of 5.6 – 6.2 dBi in the lower band and 48.4 % with 5.1 – 7.6 dBi in the upper band. For these two designs, better than 10dB front-to-back ratios, and lower than -10dB cross-polarization levels within their operating frequency bands are obtained. Details of simulation and measurement results are presented and discussed.
Subjects
Dual-band, Quasi-Yagi antenna, End-fire
Type
thesis
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ntu-97-R95942075-1.pdf
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