Abstract
A substrate integrated waveguide (SIW) based H-plane horn antenna with high gain and larger operating bandwidth is proposed in this article in a cost-effective way. An air layer is introduced between the top and bottom surfaces to increase the gain by reducing the effective dielectric constant. Extended metal circular patches with horn aperture are adopted to increase the gain of the horn antenna. Metalized via posts are used in front of the aperture to deal with the impedance mismatch issue. Moreover, air-vias are incorporated periodically into the extended dielectric slab to enhance the bandwidth. The proposed antenna is of the dimension 42 mm × 18.6 mm × 4.8 mm. The antenna operates over 20.6–21.2 GHz, 23.0–26.1 GHz and 27.4–28.2 GHz with a measured peak gain of 11.25 dBi at 20.9 GHz. The proposed antenna is fabricated and measured to validate the simulated results and it shows good agreement.
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