Abstract
A modified substrate integrated waveguide (SIW) H-plane horn antenna with enhanced gain and efficiency is proposed. The design features a multilayer hollow-core printed circuit board with integrated power-dividing and phase-shifting structures that simultaneously achieves low dielectric loss within the antenna and a refined field distribution over the radiating aperture. The antenna gain is further improved by loading a dipole array at the opening aperture of the SIW horn. Within an impedance bandwidth of 15.5%, the proposed antenna achieves a gain of up to 12.5 dBi, a radiation efficiency of 90%, and an aperture efficiency of 510%. Attractive merits including enhanced gain, high efficiency, and broad bandwidth make the proposed design a promising candidate for millimeter-wave (mmW) applications.
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