Abstract
A dumbbell-shaped slotted leaky-wave antenna based on composite right/left-handed metamaterial structure is proposed to improve the backward scanning bandwidth and achieve consistent gain. The antenna consists of substrate integrated waveguide (SIW) unit cells array, which is configured by a dumbbell-shaped slot, cut on the upper layer of the SIW, and an embedded patch underneath the dumbbell-shaped slot. The antenna improves the backward scanning bandwidth compared with the planar-slotted SIW leaky-wave antenna. A measured beam scanning range of −66° to 78° with consistent gain of > 10 dBi is achieved across a frequency range from 7.5 GHz to 13.0 GHz.
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