Planar composite right/left-handed leaky-wave antenna featuring dual beam

Abstract

A novel single-layer leaky-wave antenna utilizing composite right/left-handed transmission-line sections has been proposed. The proposed antenna is a 1-D periodic structure composed of identical unit cells. Each unit cell is constituted by a quasi-distributed series capacitance and two open stubs at opposite sides of a unit cell. The unique feature of this antenna is that main beam is scanned in one of the principal cut-planes from back-fire through broadside to end-fire, whereas in the other principal cut-plane the main beam is scanned as well, having different scanning angles in left-handed and right-handed regions. The design, simulation and measurement results of a proposed antenna operating at approximately 5-5.6 GHz are presented showing interesting features of the antenna.