Enhanced patch antenna performances using dendritic structure metamaterials

The patch antenna with dendritic structure metamaterials is proposed and the performance of the antenna is investigated numerically and experimentally. Dendritic structure metamaterials can possess negative permeability due to the resonance of the magnetic polarizability within a band where the electromagnetic wave cannot propagate. The dendritic structure has the merit of fairly high-level of symmetry and can exhibit excellent isotropy. When the frequency of the antenna lies in the resonant bandgap, the performance of the antenna can be enhanced due to the fantastic electromagnetic characteristic of the dendritic structure. The study results show that compared with the conventional patch antenna without dendritic structure metamaterials, the half-power beamwidth (HPBW) of the proposed antenna becomes more convergent and the gain is higher.