EDWAR, edwar, et al. “Microstrip Antenna Gain Enhancement Using Multilayer Substrate and Superstrate Structure for Space-Based ADS-B Surveillance”. JMECS (Journal of Measurements, Electronics, Communications, and Systems), vol. 9, no. 2, Dec. 2022, pp. 14-22, doi:10.25124/jmecs.v9i2.5707.