[1] Bhal, I.J. et al., “Design of microstrip antenna covered with a dielectric layer” IEEE Trans. Antennas and Propagation, Communications (USA) AP-30,2 (1982), 314-318.
[2]Kim Y, Lee C., Hong S, Jung C.W, and SKim Y "Design of transparent multi-layer film antenna for wireless communication" Electron. Lett., vol. 51(2014) 12-14.