Abstract
A planar leaky-wave antenna (LWA) defined by a circular configuration of strips that utilizes surface waves (SWs) for leaky wave (LW) excitation is presented for continuous beam scanning and broadside radiation. Specifically, a printed directive surface-wave launcher (SWL) source is employed as the antenna feed, generating unidirectional SW field distributions on a grounded dielectric slab (GDS). Measured maximum gain with a 6° pattern beamwidth was observed at 22.3 GHz +12° away from the broadside direction. Beam scanning is also realized over a large radiating bandwidth (18.0 to 26 GHz) with pointing angles ranging from -55° to +47° in the E(x-z) plane.
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