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URN etd-0730107-170800 Statistics This thesis had been viewed 3855 times. Download 2898 times. Author Wei-Lu Hung Author's Email Address No Public. Department Communication Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 69 Title Design and Study of Small PIFA Structures Keyword PIFA PIFA Abstract This thesis consists of four antennas and a method, Wheeler Cap Method, for
measuring the efficiency of antennas. All the proposed antennas are based on PIFA, and
PIFA is a kind of transmission line antenna. As for the transmission line antenna, if the
terminations of open-circuit end and short-circuit end are parallel, with suitable
adjustment, the reactance can be cancelled, and only the pure resistance will left.
Impedance matching is based on the concept. The characteristic of PIFA is that the
parallel of open-circuit end and short-circuit end.
The first two PIFAs are designed for embedding into tablet PCs or notebook
computers, and the operating frequency is IEEE 802.11 a/b/g. In order to make
proposed antennas can be used in different countries wideband performance is the target
for designing. The third PIFA is designed for the ZigBee system, and the operating
frequency is IEEE 802.1.5.4, 2.4 GHz band. The fourth PIFA is designed for the
WiMAX, and the operating frequency is IEEE 802.16x, 2.5-2.7 GHz.
As the devices for wireless communication is becoming smaller, the minimization
of antenna is a trend. The efficiency of antenna may be sacrificed when antenna is small.
Wheeler Cap Method is suitable for the experiment in laboratory. Measuring the
efficiency of antenna is an important issue.
Advisor Committee Chi-Fang Huang - advisor
Files Date of Defense 2007-05-02 Date of Submission 2007-08-01