A new element design for large spacing regular array antenna based on grating lobe suppression

A new pyramid horn antenna with a metallic cross grid on the radiation aperture is proposed, which works in the frequency range from 9GHz to 11 GHz. By splitting the radiation aperture of the horn antenna, the zero-depth characteristic of the antenna’s radiation pattern in E and H plane is improved. The simulated results show that the proposed element used in a large spacing 12×12 rectangular array antenna achieves an average grating lobe suppression of 7.7dB and a directivity enhancement from 0.61dB to 1.10dB when the element distance equals to 1.44 wavelength of lowest working frequency.