Before revision: This relationship did not immediately follow when using the transmission line model of the antenna, but is apparent when using the cavity model which was introduced in 1973 by Itoh and Mittra Tatsuo Itoh, and Raj Mittra "Analysis of microstrip disk resonator," Arch Elek .
After revision: This relationship did not immediately follow when using the transmission line model of the antenna, but is apparent when using the cavity model which was introduced in 1973 by Itoh and Mittra Tatsuo Itoh, and Raj Mittra "Analysis of microstrip disk resonator," Arch .