Abstract
A new rectangular cavity loaded with metamaterial structure is proposed. Its properties of resonant frequency and the distributing of near field are analyzed. Simulated results show that it not only can resonate at subwavelength but that it has also a good radiation feature used as antenna. The speciality that the resonant frequency will change with different value of negative permeability enlightens us to design a frequency continuously reconfigurable antenna for cognitive radio instead of conventional methods used MEMS to reconfigure the shape of radiator. SRRs integer with capacity and varactor diode are used to realize changing mu-negative material by controlling the voltage. According to the near field magnetic orientation, a proper alignment is chosen. At last, a simple antenna is designed. Dimensions of this antenna are very small compared to resonant wavelength (about 10%) and its frequency can be reconfigured continuously in a broadband from 342MHz to 463 MHz. Radiation patterns of the antenna are stable and the maximum gain is above 0 dBi in all operation bands. This may indeed open interesting venues for the design of electric small antennas with continuous frequency reconfigurable performance.
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