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A broadside-scanning half-mode substrate integrated waveguide periodic leaky-wave antenna architecture with antipodal tapered slots is presented. The antenna builds upon a previously proposed architecture by introducing a periodic phase-reversal of radiating elements. This enables the antenna to operate with a comparatively low substrate permittivity while maintaining grating-lobe-free scanning from reverse to forward endfire.
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Henry et al. (2015) studied this question.
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