Document Type



Master of Science (MS)


Electrical Engineering

First Advisor's Name

Tadeusz M. Babij

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Malcolm Heimer

Third Advisor's Name

Subbarao V. Wunnava

Date of Defense



The aim of this thesis is to analyze and design ultra wideband antennas for personal communication devices using Finite Difference Time Domain (FDTD) method. Initially diamond dipole, an ultra wideband antenna is selected from the literature and analyzed. The shape of the diamond dipole is modified in such a way that the straight-line base of the two triangular arms (near the feed) is replaced with an arc. The resulting antenna is named as modified diamond dipole. Performance is observed by varying radius of curvature of base of triangular arms (for constant flare angle) and by varying flare angle (for constant radius of curvature of base of triangular arms). It is shown that modified diamond dipole offers better performance in terms of impedance bandwidth and return loss, than the diamond dipole with zero flare angle.

Slot loading technique has been applied to modified diamond dipole. It is shown that the resonant frequency of the slot loaded modified diamond dipole is decreased with increase in slot size and/or decrease in distance of the slot from the feed.




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