Multi-band slot dipole antennas fed by coplanar waveguide
Date Issued
2011
Date
2011
Author(s)
Chen, You-Chieh
Abstract
Several dual- or multi-band slot dipole antennas fed by CPW for wireless communication systems are proposed in this dissertation. First of all, the effect of parasitic slots on the radiation patterns of the first harmonic mode of a coplanar waveguide-fed slot dipole antenna is presented. By adding four parasitic slots, the radiation patterns of the first harmonic mode of the slot dipole can be modified to be similar to those of its fundamental mode. Therefore, this antenna would operate as a dual-band operator with similar radiation patterns.
Secondly, a aperture-coupled slot dipole antenna capable of tri-band operation is proposed. The lower and middle bands can be obtained by varying the lengths of the lower and middle pairs of the protruded slots, respectively, while the upper frequency can be determined by adjusting the lengths of the upper protruded slot pair and the coupling aperture pair.
Thirdly, a compact bow-tie slot antenna capable of tri-band operation is proposed. Unlike most of other multi-frequency antennas having their sizes determined by the lower resonant frequency, the size of the proposed antenna is determined by the upper resonant frequency and thus it is compact in nature. The middle and lower operating frequencies are obtained by inserting two metal strip pairs near the ends of the bow-tie slot without increasing the overall antenna area.
Finally, a dual-band slot dipole antenna capacitively fed by a CPW is proposed. By adding a pair of slot stubs into the extended CPW signal strip, the resonant frequency of second harmonic mode of the slot dipole can be perturbed and reduced without increasing the antenna area while the performances of the fundamental mode are retained. This antenna is compact when compared with other CPW-fed inductively-fed slot dipole antennas.
Subjects
antenna
coplanar waveguide
multi-frequency antenna
slot antenna
Type
thesis
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