P. Sankara Rao 2022. Performance Analysis of Diffraction Gain (Gd) Due to Presence of single and Multiple Knife-Edge as Compared to Free Space E- Field and Identifying the Position of Obstacle in a Fresnel Zone. Novel Perspectives of Engineering Research Vol. 6. (Jan. 2022), 64–74. DOI:https://doi.org/10.9734/bpi/nper/v6/3109E.