S. Kumar, R. Kumar, and R. Kumar Vishwakarma, “A Circular Disc Microstrip Antenna with Dual Notch Band for GSM/Bluetooth and Extended UWB Applications”, IJET, vol. 7, no. 2.16, pp. 11–18, Apr. 2018, doi: 10.14419/ijet.v7i2.16.11408.