Influence of loop parasitic elements on bandwidth improvement of reflector backed dipole antenna

In this paper, reflector backed dipole antenna with loop-shaped parasitic elements is considered and S₁₁ characteristic is investigated. As the results, it is confirmed that the length including dipole and parasitic elements along the dipole element is affected to the low frequency resonance and the loop peripheral length and the position of the parasitic element are affected to the high frequency resonance.