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A Broadband Circular Polarized Microstrip Antenna Based on Artificial Magnetic Conductor

In this paper, a new octagonal artificial magnetic conductor unit is proposed. The bandwidth of in-phase reflection characteristics is from 8.36GHz to 9.55GHz. Then a circularly polarized microstrip antenna loading a C-shaped slot in the circular microstrip patch with 7×7 artificial magnetic conductor is designed. Simulation results show that the antenna operates in 7.42 GHz~ 10.74 GHz with return loss less than −10dB. And relative bandwidth of the antenna is 36.6%. The frequency range is from 8.30 GHz to 9.37 GHz which axial ratio is less than 3 dB. Gain of the antenna is more than 6dB in the bandwidth.