A Novel Frequency Reconfigurable Microstrip Antenna Based on Liquid Crystal

This paper proposes a novel frequency reconfigurable antenna based on the liquid crystal material because of the dielectric anisotropy. The antenna applies double layer structure so that liquid crystal can be easily injected on the second substrate. Experimental results show that when changing the effective dielectric constant of the liquid crystal, the center resonant frequency of antenna can be tuned continuously from 6.02 GHz to 5.91 GHz meaning that this antenna achieves a frequency tunability about 1.9%. Besides, in the whole adjustment process, the antenna's matching characteristics remains good. Thus, this kind of antennas are very feasible to be applied in the reconfigurable communication system. Furthermore, antenna designed in this article separates RF circuit from DC feed circuit by using a simple way, which makes the design efficient and more convenient.