A Study of Wideband and Compact Slot Antennas Utilizing Special Dispersive Materials

This paper presents a novel technique for enhancing the slot antenna bandwidth using special dispersive materials for the first time. The dispersive material whose relative permittivity is inversely proportional to the frequency by the power of n is selected and exploited for antenna bandwidth enhancement and size reduction. The concept and theory behind this work are explored. A slot antenna loaded with the new material is proposed and it is shown that the bandwidth of slot antennas using the material with power ${n}{=}2$ can be significantly improved with more than 4 times larger than the traditional case ( ${n}{=}0$ ). The simulated and measured results show excellent properties for wideband improvement and miniaturization which further demonstrates that dispersive materials can open a new path for developing wideband devices and antennas for future wireless communication applications.