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设计了一款基于低温共烧陶瓷(LTCC)技术的新型超宽带(UWB,)带通滤波器。该款滤波器结合了半集总高通结构与缺陷地(DGS)结构,利用半集总结构实现截止频率为3.1GHz的高通滤波器,再结合DGS在高端产生阻带,从而实现通带为3.1～10.6GHz的带通滤波器,尺寸仅为3.2mm×1.6mm×1.2mm。实测结果表明:插入损耗<1.5dB,反射损耗<12dB,群时延<0.8ns,带外抑制>15dB(11.5～17GHz)。测试与仿真结果较为吻合。此种LTCC滤波器结构具有尺寸小、插损小、群时延小等优点,而且结构简单,带宽和中心频率容易控制,相对带宽可做到150%以上,特别适合用于极宽带通信系统的频率选择。
A new ultra-wideband (UWB) bandpass filter based on LTCC technology was designed. The filter combines the semi-lumped high-pass structure with the defect ground (DGS) structure, using a semi-lumped structure to achieve a cutoff frequency of 3.1GHz high-pass filter, combined with DGS in the high end of the stopband, in order to achieve the passband of 3.1 ~ 10.6GHz bandpass filter, the size of only 3.2mm × 1.6mm × 1.2mm. The measured results show that the insertion loss is less than 1.5dB, the reflection loss is less than 12dB, the group delay is less than 0.8ns and the out-of-band rejection is more than 15dB (11.5 ~ 17GHz). Test and simulation results are more consistent. The LTCC filter structure has the advantages of small size, small insertion loss, small group delay and the like, and has the advantages of simple structure, easy control of the bandwidth and the center frequency, and the relative bandwidth can be more than 150%, and is particularly suitable for extremely broadband communication systems Frequency selection.