Abstract
A novel broad beamwidth leaky-wave antenna (LWA) array with non-uniform transverse slots etched on substrate integrated waveguide (SIW) is proposed. A four-way SIW power divider with equal outputs of phase and amplitude is designed to feed four SIW LWAs with different periodic tapered slots. All these LWAs are working on the 𢀒1th spatial harmonic radiation mode, and by choosing periods of slots properly, the radiation beams of them can point to different directions, and therefore, results in a broad beamwidth. Meanwhile, for each SIW LWA, by tuning the length of the radiating slots etched on the top wall of SIW according to the Binomial aperture distribution, the beamwidth can be significantly broadened and the sidelobe level can be effectively reduced. The proposed LWA array shows a 3dB beam width up to 56.8° in the backward side.
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