Stacked lowpass filter using LTCC technology

In this paper, the design and fabrication of stacked lowpass filter in a Low Temperature Co-fired Ceramic(LTCC) Technology is presented. The equivalent circuit of lowpass filter is evaluated by microwave network analysis. It is shown in this paper that the filter schematic is built on a coupled line and multi-layer electric coupled structure. The proposed LPF passes GSM band and rejects USPCS, IMT2000, WiBro, Bluetooth/WLAN, satellite DNB. The dimensions of fabricated LTCC lowpass filter are 3.5 mm × 4 mm × 0.33 mm. The proposed filter has been implemented in a five-layer ceramic substrate.