Enhanced resonance transmission of a small square aperture loaded with parallel wires in a ground plane

Abstract

This paper presents the resonance transmission of a small, square aperture with two parallel wires in a ground plane. When a plane wave excites a square aperture, aperture resonance occurs using parallel wires, which is known as resonance transmission or maximum power transmission. The resonant frequency of a 3-cm square aperture structure was reduced from 4.18 GHz to various desired frequencies by adding wires. The enhanced transmission cross sections using two parallel wires were ≈3λ²/4π (= 2Gλ²/4π, G = 1.5) for square widths of ≲0.22λ, and approached 3.56λ²/4π (= 2Gλ²/4π, G = 1.78) for square widths ≳0.22λ. The small square aperture enhanced transmission cross sections using parallel wires were between 3λ²/4π and 3.56λ²/4π.