High-pass filter, liquid crystal antenna unit and liquid crystalline phased-array antenna

The present invention provides a high-pass filter, a liquid crystal antenna unit and a liquid crystalline phased-array antenna, and relates to the technical field of antennas. The high-pass filter comprises a transmission line located between an input line and an output line, and the transmission line comprises a transmission line body and a transmission line gradual change area connected with thetransmission line body, wherein the width of the transmission line gradual change area is changed in an index relation relative to the width of the transmission line body in a transmission directionof the transmission line body. The standing-wave ratio is reduced so as to improve the performances of the whole antenna system. 本公开提供种高通滤波器、液晶天线单元、以及液晶相控阵天线，涉及天线技术领域。所述高通滤波器包括位于输入端和输出端之间的传输线，所述传输线包括传输线本体以及与传输线本体相连的传输线渐变区；其中，沿传输线本体的传输方向，传输线渐变区的宽度相对于传输线本体的宽度呈指数关系变化。本公开可降低驻波比，从而提高整个天线系统的性能。