A compact tunable microwave band-pass filter using liquid crystal material

This filter uses liquid crystal (LC) as the electro-optic material. It can realize frequency shift by changing the dielectric anisotropy, when the bias voltage is added. It is mainly used in microwave frequencies. According to the simulation results, it achieves the center frequency with 770 MHz offset. It has many advantages compared to conventional filter, such as low weight, ability of continuously tunable, miniaturization, low processing costs, low tuning voltage, convenient manufacture, etc. Therefore, it has shown great potential for modern engineering application.