Electromagnetic band gap and artificial magnetic conductor and their application to the patch antenna

In this letter, the microstrip antenna with square patch array on the front surface and two-dimensional photonic band gap (PBG) on the ground has been proposed. The ground etching structure can suppress the resonance of the harmonic frequencies effectively of the antenna while the square patch array can increase the gain comparing with the normal microstrip patch antenna. The simulation and measurement results of this novel antenna are illustrated. The comparison of radiation patterns between this novel antenna, the microstrip antenna only with ground etching structure and the normal microstrip antenna is also presented.