Dual-band circular-polarization reconfigurable liquid dielectric resonator antenna

A novel single-fed dual-band circular-polarization (CP) reconfigurable liquid dielectric resonator antenna (LDRA) using 3D printing technology is proposed in this article. With the quasi-TE111 and -TE113 modes of the rectangular LDRA excited, a dual-band design is achieved. To realize the CP reconfigurability, a combined container, holding the fluidic dielectric (Ethyl acetate, epsilon(r)=6.6), is fabricated by 3D printing technology. Therefore, the CP can be switched between two different states: (1) left hand CP (LHCP), when the right oblique container is full of the liquid solution; (2) right hand CP (RHCP), when the liquid solution is transferred into the left oblique one. Measured results demonstrate that the proposed antenna can achieve the CP reconfigurability in dual band, with the wide bandwidths (|S-11|<-10 dB and AR<3 dB) of 10.4% (1.55-1.72GHz) and 9.7% (2.29-2.52GHz), which cover GPS and WLAN bands.