Design of Coplanar Waveguide-Fed Slot Antennas for Wireless Applications
Date Issued
2005
Date
2005
Author(s)
Chen, Shih-Yuan
DOI
en-US
Abstract
In this dissertation, a new category of coplanar waveguide (CPW)-fed slot antennas with various impedance and radiation characteristics, including three slot antennas and two slot array designs, is presented. These antennas can find applications in a variety of wireless communication systems.
Based on the CPW-fed slot dipole antenna, three novel designs of CPW-fed slot antennas are proposed to satisfy different system requirements, including the dual-band and wideband operations and the miniaturization. First of all, in Chapter 2, the CPW-fed radial slot antenna is developed for dual-frequency operation. By increasing the length of the central slot pair, an additional lower resonant frequency can be obtained. Various frequency ratios, within the range of about 1.3 to 2.1, of the two resonant frequencies can be achieved by varying the included angle between the radial slots, and they are verified experimentally. Design curves are last plotted according to the measurement results. Secondly, in Chapter 3, the flip-over of one half of the bow-tie slot and the insertion of the delay slotline sections into the CPW-fed bow-tie slot antenna with broadband essence results in three modified designs, of which the maximum operation bandwidth can be increased to be twice that of the original bow-tie slot antenna. In Chapter 4, the CPW-fed capacitive folded-slot antenna and its miniaturization are presented. To facilitate the miniaturization, the effect of the finite size of the ground plane on the input matching condition is discussed and verified experimentally.
For the CPW-fed slot array antennas, the open-ended rampart slot array antenna is proposed in Chapter 5. The shunt rampart slotline pairs are terminated in open circuits instead of short ones so as to increase the antenna efficiency and gain, improve the radiation patterns, and simultaneously reduce the antenna size. Furthermore, the antenna structure is simple and can easily be designed in the form of linear or planar arrays. Finally, in Chapter 6, the CPW-fed horn-shaped slot array antenna is presented to possess a wider operation bandwidth, which results mainly from the inherently broadband feature of the radiating horn-shaped slot elements. By properly placing the radiating slots and carefully designing the feeding network, the peak antenna gain of the horn-shaped slot array antenna can be increased enormously without influencing the wideband characteristics.
Subjects
共面波導
開槽天線
coplanar waveguides
slot antennas
Type
thesis
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