Student Number : 0002066T -
MSc dissertation -
School of Electrical and Information Engineering -
Faculty of Engineering and the Built Environment / Investigations of uni-directional, horizontally polarized waveguide antennas with longitudinal slotted arrays operating at 2.45GHz and their applications to wireless local area
networks (WLAN) are presented in this paper. Requirements,
considerations, and limitations associated with the design process
of this particular waveguide are discussed and presented. Various antenna parameters were simulated using MATLAB®
and SuperNEC® software simulation programs, and were
applied to a sensitivity analysis of antenna design. End-fed and
center-fed antennas were designed, built, and measured at
WLAN frequencies. Measured antennas had high gain above 15dBi, broad beam around the azimuth, and high efficiency, but
were limited by their impedance dependency and narrow bandwidth. The center-fed antenna had 3dBi higher gain than
the 18dBi gain of the end-fed antenna. The VSWR ratio of both
antennas was less than 1:1.5 at the operating frequency. The
center-fed antenna had broader azimuth and elevation patterns
by 40° and 10°, respectively. The end- fed antenna had more stable gain and VSWR, 50% wider VSWR bandwidth of
100MHz, and more directional elevation pattern. The design
criteria generated using waveguide theory and simulated analysis
was validated by the physical design and performance of the measured antennas.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/1673 |
| Date | 14 November 2006 |
| Creators | Perovic, Una |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 430520 bytes, application/pdf, application/pdf |
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