A LTCC band pass filter for wireless applications

MCM (Multi-chip Module) is presently the most effective method for realizing the miniaturization of wireless front-end applications. Filter is one of the most important components in the MCM. In this paper, a novel quasi-lumped band pass filter for wireless front-end was designed and fabricated, adopting low-temperature cofired ceramics (LTCC). The BPF circuit is based on the quasi-lumped filter topology and a wideband circuit design method was adopted. The BPF has been simulated and optimized by Ansoft HFSS. The measured results which were tested not only in the normal atmospheric temperature but also in the high and low temperature agree very well with the full-wave electromagnetic designed responses The proposed filter has been realized in a ten layers ceramic substrate, showing promising application potentials in miniaturized wireless front-end.