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This communication introduces a modified substrate integrated waveguide (SIW), the gap SIW, and deduces an approximate closed-form expression for calculating its effective width, taking into account the fringing and coupling fields around the gap. As an immediate application, this new structure is used to correct the phase distribution of an H-plane SIW horn antenna. The achieved quasi-uniform distribution...
The electromagnetic field phase distribution in horns' apertures is affected by the horn flaring and is usually not uniform, resulting in a lower antenna gain. This paper presents an H-plane SIW horn antenna with the aperture phase corrected by some gaps on the H-plane metallic walls, to enhance the antenna gain. To achieve a better radiation and impedance matching, some planar tapered-ladder transitions...
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