Miniaturized Slot Antenna with Frequency Tunability
Date Issued
2009
Date
2009
Author(s)
Tseng, Chun-Wei
Abstract
A novel miniaturized slot antenna terminated by a lumped capacitor is presented in this thesis. A lumped capacitor is placed at the truncated open end of a quarter-wavelength slot antenna to lower the resonant frequency; in other words, to reduce the slot length for the same resonance. The proposed slot antenna is offset fed by a microstrip line with an open stub, which is used mainly to tune out the input reactance of the antenna. With the conventional feeding structure, there is no need for any extra matching circuit. In this thesis, design guidelines for bandwidth enhancement of the miniaturized slot antenna are also discussed. A prototype antenna of slot length λ0 /17 etched on a small rectangular metallic area of dimensions λ0 /16 λ0 /19 provides an impedance bandwidth of 3.2%. Lastly, a varactor diode is used instead of the chip capacitor to attain the frequency tenability for the miniaturized slot antenna. The resultant design exhibits a very wide frequency tuning range between 1.18-2.42 GHz.
Subjects
Miniaturized antennas
slot antennas
reconfigurable antennas
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96942065-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):8454fe3a7cb15bf6f2228359973d1cfc