Design and pattern synthesis method of dual polarization liquid crystal array antenna

For the application of polarimetric phased array radar, a two-dimensional pattern re-configurable biorthogonal polarization array antenna design method based on electromagnetic liquid crystal is proposed. The array antenna consists of two sub-wavelength metasurface linear antenna array with orthogonal polarization alternately arranged, the elements on the array have two working states, and each element can be independently controlled. The antenna uses the electromagnetic tunable ability of liquid crystal metamaterial structure in one dimension to realize the independent control of two polarization patterns by holographic pattern synthesis method, and uses the external phase shifter in another dimension to realize pattern re-configuration of two polarization modes separately. The simultaneous pattern reconstruction of the orthogonal polarization signal is realized innovatively in two direction dimensions, and the consistency and good isolation of the orthogonal polarization in the 2D pattern reconstruction are ensured. The sim-ulation results show that the main lobe gain difference of the two orthogonal polarization is less than 0.01 dB at bore sight and 0.02 dB at the beam direction angle -40°. This design ensures the consistency of the orthogonal polarization pattern and has the characteristics of low power consumption, low loss, low cost manufacturing, and light and thin structure, at the same time, the structure is simple. This paper provides a novel design scheme for the precise signal guidance application of small fully polarimetric phased array radar.