In this paper a dual band substrate integrated waveguide H-plane horn antenna is proposed. The radiating aperture of modified antenna is half elliptical shaped with specified major and minor radius. To improve backward radiation and directivity of the proposed antenna, a reflector plate is located around the radiating aperture. The proposed antennas are numerically investigated using High Frequency Structure Simulator (HFSS) software. Radiation performance of the modified horn is presented and compared with those of the conventional horn. Results illustrate that proposed structures provide directivity of 10 dB at the first band, which is 3.1 dB more than directivity of the conventional horn. For the other band, antenna directivity is enhanced up to 7.36 dB.

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