Hello Ram,I am also PhD and my work is close to yours


IEEE 142
if sl
R=(p*(log(8*l/d)+log(4*l/s)-2+(s/(2*l))-((s^2)/(16*l^2))+((s^4)/(512*l^4))))/(2*n*pi*l)

if sl
R=(p*((log(8*l/d))-1))/(2*n*pi*l)+(p*(1-((l^2)/(3*s^8))+((2/5)*((l^4)/(s^4)))))/(2*n*pi*s)