Ku-band Waveguide Slot Filtering Antenna Based on Metallic-Nail Metamaterial

A waveguide slot filtering antenna is studied for Ku-band satellite communications in this paper. In order to improve the signal isolation and signal-to-noise ratio (SNR) of the received signal at 12.25-12.75 GHz, it is necessary to filter the transmitted signal at 14-14.5 GHz. Therefore, unlike traditional waveguide slot antennas, a metallic-nail metamaterial is used to embed at the bottom of the inside waveguide. Thus, a bandgap that cannot propagate electromagnetic waves is obtained. To validate the effectiveness of the antennas, numerical simulation results are presented. Sufficient radiation and significant radiation suppression are achieved at the receiving frequencies and transmitting frequencies, respectively. The studied 8-slot antenna has a gain suppression effect of 14.45-31.8 dB at the transmitting frequency.