Abstract
In this article, the use of liquid crystal-based patch antenna is proposed. A first test device was, therefore, conceived in planar technology with a low-cost foam substrate. In order to have a reduced antenna structure, we have studied an antenna miniaturized by inserting slots. Moreover, the use of liquid crystal in the design of patch antennas allows adjustment of the resonance frequency. To benefit from liquid crystal anisotropy and thus obtain agility, the antenna response is modified by means of an external static electric field that tells on dielectric permittivity of the liquid crystals. The simulated results of the devices are compared with measured data, and good agreement is obtained. Key words: Liquid crystals, patch antenna, agile structure, microwave.
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