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|Other Titles: ||Investigation of feeding methods for the inverted L/F antennas|
|Authors: ||陳曦;Chang, Hsi|
|Issue Date: ||2010-09-23 17:54:29 (UTC+8)|
In recent years, mobile communication network has been the most widely used wireless application, along with the rapid development of the Internet world wide web. Nowadays, network has become an important platform to carry various software application. Furthermore, the development of wireless LAN out of the fixed broadband networks is a very important and critical step, which enables consumers to access network almost from any place. No need for the cable can one access the network via simply the wireless mobile devices. However, with these compact mobile devices the antenna should be
carefully integrated, which requires design ingenuity. Among which, technologies to reduce the antenna size are important ones .
In this thesis the characteristics of the basic inverted L antenna are examined first. As a good comparison of the original inverted L antenna, an offset-fed inverted L antenna is proposed to improve the ILA, for which the impedance mismatch problem at the fundamental frequency (1.8GHz) is resolved, but still retain the low profile, small size and other inherent advantages of the ILA antenna. The offset-fed approach is is entirely different from the design concept of the traditional inverted F antenna (IFA).
Then, associated with the ground surface, the introduction of several coupling strips of different geometrical shape is employed to increase available frequency range for the offset feed antenna. The goal is to achieve the dual-band antenna design. By exploring the characteristics of such antennas, the return loss, the real part of impedance and imaginary impedance of the original antenna were carefully compared, by which the uses of coupled strip are tested with the aim of dual-band design.
Finally, the paper investigate effect of changing the feeding position of the traditional inverted F antenna. Simulation results show that by simply changing the feeding position the resonant frequency can be substantially moved around, while a very good impedance matching is maintained, which is quite interesting and of practial use.
|Appears in Collections:||[Graduate Institute & Department of Electrical Engineering] Thesis|
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