LTCC Bandpass filter using low temperature co-fired ceramic process

摘要

In the bandpass filter using the LTCC process, the bandpass filter according to an embodiment of the present invention includes a plurality of resonators having both ends connected to an input terminal and an output terminal, and electromagnetically coupled to each other, and stacked on the resonators. , a transmission line including a cross-coupling circuit for forming an attenuation pole, wherein both ends of the cross-coupling circuit are short-circuited, and cross capacitors (C1_cross, C2_cross) connecting the output terminal from the input terminal are connected, It is characterized in that it resonates in parallel with the inductor generated by mutual inductive coupling, and forms an attenuation pole to improve attenuation characteristics of frequencies adjacent to the passband.