A novel miniature bandpass filter and application in millimeter passive wave front-end

In this paper, A novel double-layer coupled stripline resonator is designed and used as resonator of a miniature bandpass filter. The filter consisting of double-layer resonators is designed and measured based on low-temperature co-fired ceramics (LTCC) technology for millimeter wave front-end module at 34 GHz. The BPF which is made up of three double-layer resonators has been simulated by Ansoft´s High Frequency Structure Simulator and measured via probe test station. This filter which has been realized in a six layers ceramic substrate exhibits an insertion loss of 1.92 dB at the center frequency of 34.3 GHz, a rejection <;-30dB (at 31.8 GHz and 37.2 GHz), and 3dB bandwidth approximately 7.6% (2.6GHz). The simulated results meet the measured results every well. Due to its vertical double layer structure, this filter shows promising application potentials in miniaturized LTCC passive millimeter wave front-end module.