A Literature Review on Yagi Uda Antenna: Old but Still used in Communities

Antennas are the basic components of any communication system. They are connecting links between the transmitter and free space or free space and the receiver. There are different types of antennas. Yagi-Uda antenna is a kind of antenna that is widely used where specified gain and directivity are required. It is very easy to increase directivity in Yagi-Uda antenna. Recently Microstrip antennas can be configured in a Yagi-Uda configuration for low- angle satellite reception for mobile communications [3]. The electromagnetic energy is coupled from the driven patch to the parasitic patches not only through space but also by surface waves in the substrate in the microstrip Yagi array. The microstrip patches to function similarly to the Yagi dipoles, the adjacent patches need to be placed very closed to each other so that a significant coupling can be obtained through surface waves in the substrate. Although the configuration and coupling mechanism of the microstrip Yagi array and dipole Yagi antenna are different, the rules of these two types of Yagi-Uda are very similar. By increasing the thickness of the dielectric substrate between the radiator and the ground plane, bandwidth can be increased. Basic principle, characteristics and different works on Yagi-Uda antennas are discussed here with its potentiality.