Design of RF Energy Harvesting Dual Band Microstrip Antenna Using Reflector

Shadhon Chandra Mohonta

Abstract

In wireless applications, dual band microstrip antenna plays a significant role which can resonate at two frequencies. In this work, a high gain dual band microstrip antenna with electromagnetic band-gap (EBG) structure and reflector has been proposed and designed for RF energy harvesting. The antenna has been designed both with and without reflector, and simulated in CST microwave studio which operates at 3.31 GHz and 4.85 GHz. The important parameters such as gain, and reflection coefficient have been simulated for the proposed antenna by implanting a reflecting plane at a suitable distance of 15 mm. The antenna with the reflector shows higher gain of 9.14 dBi, and 7.8 dBi at 3.31 GHz, and 4.85 GHz respectively. In addition, the equivalent electrical circuit model of the proposed antenna has been designed and analyzed numerically using MATLAB to facilitate this analysis. The response of reflection coefficient from the circuit model using MATLAB shows good agreement with the simulated reflection coefficient from Computer Simulation Technology (CST).

Conclusion

In this work, a dual band microstrip antenna has been successfully structured, and simulated for harvesting RF energy. The reflection coefficient of the proposed antenna has improved due to the use of reflector. Moreover, the gain of the antenna is higher than the other related works done so far, specifically at the frequency band 3.31 GHz. The equivalent lamped elements circuit model for the proposed antenna has been designed, and numerically analyzed in Matlab platform. The equivalent circuit model shows a good matching reflection coefficient response as from the proposed antenna.

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