A Survey on Different Feeding Techniques of Rectangular Microstrip Patch Antenna

In this paper describe the different feeding technique for wireless microstrip antenna, which are microstrip line feed, coaxial plane feed, proximity coupled feed and aperture couple feed. Microstrip line and coaxial probe feeds are contacting scheme, in which RF power directly to the radiating patch. Proximity and Aperture coupled feeds are non contacting schemes ,in which electromagnetic field coupling is done to transfer power between the microstrip line and the radiating patch. Feeding techniques are govern by many factors like efficient transfer of power between the radiation structure, feeding structure and their impedence matching .These techniques give a better understanding of design parameters of an antenna and their effect on return losses ,bandwidth ,VSWR and resonant frequency .