Abstract
The combination of dipole antennas and 3D diamond-structure photonic crystals is investigated by simulating method in this paper. The radiation frequency point of dipole antennas was selected to correspond to the reflection frequency point of the strongest energy in band gap. The results show that there is a good resonance performance in the range of band gap, which also indicate that in all direction the surface waves which propagate along the surface of the photonic crystals substrate can be suppressed because of the reflection the band gap. Moreover, coupling antenna has low return loss and improves the directionality compared to common dipole antenna. The EM waves are reflected and a high gain is attained, improving from 2.76 dB to 7.14 dB. Due to these merits of photonic crystals substrate, coupling antennas exhibit the excellent radiation performance, which will be widely utilized in communication field.
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