Validity of the Expression of Transmission Cross-Section for Two Cases: A Single Transmission Resonant Aperture Structure and Finite Array Structure Composed of a Non-Transmission Resonant Aperture

For an electromagnetic plane wave that is normally incident upon aperture or array in infinite perfectly electrical conducting plane, the validity of general expression for transmission cross-section as a measure transmitted power through investigated following two cases: first, single resonant (TRA) such complementary split ring resonator, which larger than Bethe’s small magnetic dipole; second, finite periodic non-TRA usual circular rectangular apertures aligned along E-plane direction corresponding to parallel configuration terms terminology dipole theory. To validate investigation, proposed applied distribution, and results are compared with obtained using Rao–Wilton–Glisson method above cases distributions. Consequently, it discovered non-TRAs, produces improved directive field H-plane used Huygens source. This observation may aid understanding underlying physics two-slot model microstrip antennas basic 1D linear minimal system exhibiting extraordinary optical phenomena 2D arrays.