C-Band Quasi Yagi Antenna

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