Efficiency improvement of small slotted annular ring antenna using laminated conductors

Ohmic Losses in a thin solid conducting element can be reduced significantly by the use of a composite conducting medium. The composite medium here consists of subsequent layers of thin laminated conductors, where the laminations are constituted by low loss dielectric of thickness comparable to the skin depth of the conductor. In this paper, firstly analytical study, showing the loss reduction in composite conducting media when compared to a single conductor case is presented. This concept is then applied to a miniaturized slotted microstrip annular ring antenna to improve its efficiency. It is seen that using the proposed technique around 20% improvement in efficiency was obtained.