A coaxially stacked annular ring microstrip antenna (ARMSA) and circular microstrip antenna using L-probe feed and orthogonally slot-loaded at the inner periphery of the ARMSA is designed and fabricated for multiband application. The theoretical analysis of the proposed antenna has been carried out using modal expansion cavity model and circuit theory concept. Simulation of the proposed antenna has been performed using Ansoft HFSS software. The experimental results of input characteristic are obtained using Agilent™ vector network analyzer. The proposed antenna is resonating in L-band (1.88 GHz), S-band (2.51 GHz), and C-band (3.81 and 4.88 GHz) band with 6.38, 9.96, 2.62, and 3.27% impedance bandwidth, respectively. Theoretical and simulated results are in good agreement with experimental results.
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Singh et al. (2015) studied this question.
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