A Comprehensive Review of Different Feeding Techniques for Quasi Yagi Antenna

Yagi Uda antenna is a directional antenna but has limited bandwidth. To improve the bandwidth, various Quasi Yagi antennas can be designed by using different feeding techniques and different element shapes. In this paper, three different types of feeding techniques are reviewed i.e. microstrip-to-coplanar stripline transition (MS-to-CPS), coplanar waveguide feed (CPW) and Tapereded balun, which convert unbalance input to balance output. From the study it is found that MS- to- CPS transition provides higher bandwidth at the cost of low gain and lower frontto-back ratio. CPW is simple feed structure having compact size but lower gain. Tapered balun provides higher bandwidth but requires larger size.