Abstract
A novel approach of frequency tunability to cover multiple wireless applications by using four PIN diodes as a switching element is presented. Five switching modes of PIN diodes are analyzed for frequency tunability. The parasitic metamaterial superstrate achieves performance improvement shown in the design. Numerical analysis of metamaterial rings and equivalent circuit models of the SRR and PIN diode are also presented. The structure is analyzed regarding reflection response (S11), Gain, VSWR, directivity and E-field for 2 GHz–6 GHz. Computational analysis is performed by the HFSS simulator and is compared with the fabricated structure (FR-4) for verification. Copper and liquid-based material are used for performance analysis of all the models, and comparative analysis is included. Liquid-based split ring resonator provides a maximum total gain of 5.564 dB, reflection response of −43.36 dB and tunability of 510 MHz. The proposed antenna is used in 5G, WLAN, WiMAX and LTE applications.
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