Abstract

A frequency reconfigurable dielectric resonator antenna (DRA) is presented with a water-loading mechanism in this paper. The resonant mode of the DRA is adjusted between the fundamental $$ and quasi- $$ modes. To demonstrate the proposed method., a solid dielectric material of K9 glass with the permittivity of 6.25 and a layer of water with the permittivity of 77 are selected to construct the DRA. The resonant frequency of the DRA could be switched between the states of 2.4 and 3.45 GHz by altering the flow of water within a container on the top of the DRA. Finally, The DRA is fabricated and measured, which performs with a stable realized gain and a decent total efficiency of the two states.

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