Dual Band High-gain Photonic Crystal 5G Antenna with I-slot for C-band Applications

3.62 GHz is the trending 5G frequency band of satellite TV broadcasting and various small earth stations, and 5.8 GHz is the promising industrial scientific medical (ISM) band. The antennas operating with both bands are much needed. In this paper, a dual band high-gain photonic crystal (PC) microstrip antenna with I-slot for C-band applications is proposed. To achieve dual operating band, an I-slot is embedded in the patch. In order to achieve a higher gain, two silicon dioxide slices, as one-dimension PC, are putting on both sides of patch. The simulation results show: (1) the operating frequencies of the proposed antenna are in 3.61–3.63 GHz band (can be used in 5G NR n78 band) and 5.72–5.95 GHz band (can be used in ISM band); (2) the gain is as high as 8.8 dBi (at 5.82 GHz).