Slot spiral miniaturized antenna

摘要

A slot spiral miniaturized antenna is described. The antenna includes a conductive layer formed on a first side of a dielectric substrate. A slot arranged in the form of a spiral curve and having a slow-wave structure is formed in the conductive layer. The antenna also includes a planar balun formed on a second side of the substrate. The balun is in the form of a conductive layer strip positioned beneath a section on the conductive layer defined by an area between two neighboring parts of the slotline. The conductive layer strip has a shape that replicates a pattern of the two neighboring parts of the slotline. The conductive layer strip provides a balanced feed to the slot at a feedpoint that is defined by a place wherein a projection of said conductive layer strip on the second side intercepts the slotline. Electromagnetic coupling between the conductive layer strip and the slotline without electrical contact causes the exciting of the slotline. The antenna of the present invention is geometrically smaller than another antenna performing the same functions, but without such features as the slow-wave structure of the slotline and the replication of a pattern of the slotline shape by a conductive layer strip.