三个传输零点的三阶LTCC Ka-band窄带滤波器

A Ka-Band Third-Order LTCC Narrow Bandpass Filter with Three Transmission Zeros

本文介绍了一种基于LTCC(低温共烧陶瓷)技术的Ka波段三阶窄带滤波器,中心频率35.78GHz,带宽0.8GHz(2.24%),带内插损小于0.1dB(未考虑介质和金属损耗)。并且在输入输出端口、各枝节之间引入交调耦合分量,在带外形成三个传输零点,带外抑制EM仿真结果为:>20dB@f>36.9GHz,>30dB@f<34.9GHz。此滤波器可用于毫米波收发组件中,对镜频信号和杂波进行抑制。

A LTCC(low-temperature co-fired ceramic)narrow bandpass filter of Ka-band is presented.The filter has a 2.24% fractional bandwidth with the center frequency at 35.78GHz,and its Insertion Loss is better than 0.1dB(any metal or substrate loss is ignored).With increasing the cross-coupling among stubs,the input and output ports,the filter has three transmission zeros.Using the EM simulation,the excellent depression is higher than 20dB above 36.9GHz,and higher than 30dB below 34.9GHz.This filter is used in the millimeter-wave T/R module for rejecting the mirror frequency and spurious responses.