Abstract

This article presents design and evolution of dual band RMSA (rectangular microstrip antenna) with orthogonal polarization. First we have designed a single band RMSA which operates at Bluetooth band then it is modified into a dual band RMSA. The dual band RMSA has return loss ≤ −10 dB from 2.41 GHz to 2.47 GHz (i.e. Bluetooth Band) as well as from 5.05 GHz to 5.45 GHz (i.e. lower WLAN band). It shows orthogonal polarization at these two operating frequency bands. It exhibits horizontal linear polarization at Bluetooth band and vertical linear polarization at WLAN band. The proposed antenna has its radiation pattern in broadside direction. It has acceptable gain and efficiency within operating frequency range. It is designed over a low cost FR4 substrate having relative permittivity equal to 4.4 and height equal to 1.6 mm. It is fed with a microstrip line of 50 Ω. Parametric analysis is carried out on different dimensions of antenna in CAD FEKO simulation software to obtain desired results.

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