This thesis is concerned with investigations of types of broadband antenna elements
namely quasi Yagi antenna. This antennas will be fabricated with a dielectric constant
substrate material (FR4 with dielectric constantεr = 5.4), substrate thickness of 1.6mm
and design frequency of 4 GHz. The first part of the thesis deals with the theory behind
microstrip antennas and transmission lines. An introduction to microstrip antennas is
presented, followed by a literature review on microstrip design equations and background
information with regard to microstrip broadband planar antennas. The three most
commonly used broadband planar antennas are illustrated, namely the Microstrip Patch
antenna, quasi Yagi antenna and Tapered Slot Antenna. In contrast to the microstrip
patch, both the arrays of quasi Yagi antenna and the single-element quasi Yagi antenna
radiates at the end-fire direction. As a result, both these antennas can achieve higher gain,
lower side lobes and wider bandwidth compared to the conventional microstrip patch
antenna. The second part of the thesis is concerned with design procedures and
considerations for the antenna. The design for the antennas is aimed at obtaining wider
bandwidth and better radiation patterns. Besides, a sensitivity analysis of the quasi Yagi
antenna with respect to the design parameters is demonstrated in chapter 4 of this thesis.
The simulation of the quasi Yagi is accomplished by using Avanced Design System
(ADS) software. The simulation results showed that the quasi Yagi antenna is able to
achieve at the desired frequency (4 GHz) that is in the C band frequency
