In this article, an analysis of 1×2 array antenna has been presented for multiband applications that is etched on FR-4 substrate (tan δ = 0.02, εr = 4.3). This structure contains two rectangular-shaped radiating element, ground plane and feed lines. The position of resonance frequencies (fTM 10, fTM 02, fTM 12, fTM 20) are revised by the length of vertical and horizontal arms of the L and T-shaped slot. The proposed antenna exhibits resonances at frequencies 2.18 (2.16-2.2 GHz with bandwidth 1.83%), 3.22 (3.2-3.24 GHz with bandwidth 1.24%), 4.32 (4.3-4.34 GHz with bandwidth 0.93%) and 4.56 (4.54-4.58 GHz with bandwidth 0.87%) GHz. The series of equations have been deduced after studying the surface current distribution at resonating frequencies. Deformation of radiation pattern in both principal plans has been observed at frequencies 4.32 and 4.56 GHz.
Key words: Mode, Surface current distribution, Resonance frequency, Radiation pattern, Array antenna
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