Gain enhancement of patch antenna using L-slotted mushroom EBG

Gain enhancement of patch antenna is investigated in this paper. A rectangular patch antenna fed by coaxial probe is designed for a resonant frequency of 5.8 GHz. The resulted gain and bandwidth are 5.3 dB and 160 MHz respectively. Using standard mushroom Electromagnetic Bandgap (EBG) placed at a distance 3 mm from edge of the patch, a bandwidth of 143 MHz and a gain of 5.5 dB is achieved. A novel L-slot mushroom EBG (LS-EBG) is proposed. The L-slot one layer and two layers of EBG structures are used to further enhance the gain by 0.6 dB and 1.2 dB respectively.