A Transparent Frequency-Reconfigurable Monopole Water Antenna based on Dielectric Resonator

A novel monopole dielectric resonator antenna with excellent transparency and convenient frequency reconfigurability is proposed in this paper. This antenna consists mainly of distilled water, sea-water and plexiglass tube, which makes this antenna is optical transparent and nontoxic. As a resonator, sea-water in the tube can be able to improve the radiation efficiency. Around the coaxial probe, five concentric ring pillar plexiglass containers form an adjustable ground plane for this antenna. By whether a container is filled with distilled water or not, the proposed antenna enables a quick switch between five different work modes. Thus, frequency-reconfigurability has been achieved. Simulated results show that a dependable impedance bandwidth of |S
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|<-10dB (ranges from 31.68% to 54.13%) and radiation efficiency (range from 30.56% to 61.54%) are achieved. The proposed antenna is not only suitable for the devices which are optical sensitive, but also the systems in which multi-band and broadband is required.