A novel microstrip feed based on the theory of small reflection

Abstract: A six-element microstrip patch antenna based on the theory of small reflection is investigated. The radiators are excited by a novel transmission line. The maxim and minim energy on the proposed transmission line are determined based on voltage allocation on a short-circuited microstrip line. Each radiator, made of a square microstrip patch, is designed to resonate at 5.8 GHz target frequency, with each of them carefully positioned at the maxim in a series-fed array arrangement, in order to catch optimal radiation on excitation of the line. The results obtained are impressive, with an impedance bandwidth of about 6.90%, an aperture size of 1.6λ × 2.1λ and a gain of about 14.2 dBi. The feed demonstrates a compact size advantage, in particular when compared with the conventional series feed network