Abstract: An L-band high-pass filter based on LTCC technology is presented in this paper.The filter adopts a symmetric structure,reduces the design complexity,and increases the transmission zero through the spatial coupling effect of the special structure of the feed port.After circuit simulation and 3d electromagnetic field simulation and optimization,the final design of bandpass filter size is 3.2mm x 1.6mm x 0.94 mm.The simulation results show that the cut-off frequency of the filter is 1200 MHz,with interpolation loss less than 3dB,the standing wave ratio is better than 1.3,and the stopband inhibition is greater than40dB（0～800Mhz）.