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Broadband Metal Wall Loaded SIW H-Plane Horn Antenna With Improved FTBR

A broadband substrate integrated waveguide (SIW) H-plane horn antenna with back-lobe suppression for Ka-band application is proposed in this paper. Based on the traditional H-plane SIW horn antenna, by loading a folded metal wall behind the horn aperture, the backward radiation is suppressed. Moreover, for better impedance matching, the substrates are directly extended and metal lines are loaded on the upper and lower substrates separately. Simulation results show that the designed antenna bandwidth reaches 39.9% (from 25.1 to 37.6 GHz). The simulated result also indicates that the proposed antenna achieves stable radiation patterns with the average gain of 9.9 dBi, as well as back-lobe level of larger than 10 dB. Importantly, the front to back ratio (FTBR) of the antenna is better than 20 dB over the operating band basically.