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A Frequency Reconfigurable Antenna for Microwave Applications

In this paper, two models for dielectric resonator antenna (DRA) with frequency reconfigurable capabilities are investigated. The frequency agility is achieved via integrating ideal switches with the DRA structure employed for microwave applications. The first model investigates the integration of five switches on the DRA surface to connect the printed metallic ring and the ground plane. The resonance frequency and the impedance matching bandwidth are controled by the combination of the switches states to be ON and OFF. The resonance frequency is varied from 9.7 GHz to 11.5 GHz with 190 MHz bandwidth. In the second model a conducting plate is printed on the top of the DRA and eight metallic switches connect it with the ground through eight metallic strips. The reconfigurable frequency of the antenna is changed from 6.2 GHz to 8.08 GHz. A full-wave analysis is used to model and analyze the radiation characterstics of the antenna structure. A time domain based finite integral technique (FIT) and frequency domain finite element method (FEM) are employed.