关键词: LTCC, 滤波器, 中心频率

Abstract: This paper was aimed to analyze the center frequency deviation of about 50 MHz towards low frequency in the LTCC band-pass filter. According to the center frequency formula, the technical indexes: the inductor line width, the dielectric layer thickness and the layer-to-layer positioning accuracymay be responsible for this skewing. These indexes value were then extracted by slicing the sample and further analyzed in HFSS to measure their influence on the center frequency of the band-pass filter. And deviation of the inductor linewidthwas diagnosed as the main culprit for this divergence. The optimization of the center frequency from 50 MHz to 5 MHz was eventually attainable by adjusting the inductor line width and rendering the technical index consistent with its design value.

Key words: LTCC, filter, center frequency