In this paper a new low profile, substrate integrated waveguide H-plane horn antenna with high directivity is introduced. In order to suppress parasitic radiation and to reduce conductor loss of the feeding structure, a coaxial probe is used to excite the antenna. The proposed SIW horn antenna is numerically studied using High Frequency Structure Simulator (HFSS) software. Radiation performance of the proposed antenna including reflection coefficient, radiation patterns and directivity are reported and compared with those for a conventional SIW horn. Results illustrate that the new structure provide directivity of 8.8 dBi, which is 1.9 dBi more than the directivity of the conventional H-plane SIW horn, while its size is only 60% of the conventional SIW horn at the Centre frequency of 27 GHz.

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