Compact 2.45 GHz microstrip antenna design usingcomposite right/left-handed transmission lines

Based on the composite right/left-handed transmission lines, a compact 2.45 GHz antenna with electromagnetic bandgap (EBG) double-negative (DNG) meta-materials is designed and manufactured. The two electromagnetic bandgap (EBG) structures modified by adjusting to non-uniform structures are used as the basic radiation part of microstrip antenna. The parallel capacity and inductance of equivalent circuit can be adjusted by the size of the microstrip patch and the radius of via respectively, therefore, the resonant frequency can be determined. Moreover, a microstrip antenna operating at 2.45 GHz is designed and manufactured with the dimension of 53.2 mm×19.8 mm. The return loss at 2.45 GHz is -32.6 dB, the radiation pattern is roughly 8 shaped radiation pattern and the maximum gain is 0.72 dB. The measurement results fit very well with the simulation, which validates the effectiveness of the proposed design.