I am looking for an analytical formula to calculate the feed length for the Inset fed MSA(micro strip antenna ), kindly point me to the correct reference/article.
Thanks , Yes it helps a lot. But I am not able to find any article / paper. I have gone through the literature but I am unable to find any papers which suggest the formula for "Lf".(Refer above figure")
It is quite likely that the value of LF doesn't matter, because the slots match the line to the antenna so it is just part of a matched transmission line.
Ying Hu, David R. Jackson, Jeffery T. Williams, Stuart A. Long, and Varada Rajan Komanduri. "Characterization of the Input Impedance of the Inset-Fed Rectangular Microstrip Antenna"IEEE Transactions on Antennas and Propagation, Vol. 56, No. 10, October 2008