Abstract
A novel planar, dual band antenna for 2.4, 5.2 & 5.8GHz ISM band applications, on a substrate of relative permittivity 4.3 is proposed. The wide band at higher resonance is due to the modified planar dipole and the lower resonance is achieved by a stepped impedance resonator (SIR), which is electrically coupled to the modified dipole. The 2:1 VSWR impedance bandwidth of the proposed antenna is 95MHz for the first resonance and 1.38GHz for the second resonance. The radiation patterns are nearly omnidirectional and the maximum measured gain is 2.6dBi and 3.6dBi at 2.48GHz and 5.35GHz respectively.
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