Design of microstrip band pass filter based on LTCC for UWB sensor system

This paper deals with design, simulation, manufacturing and experimental testing of microstrip bend pass (BP) filter for I - Q (In-phase Quadrature) demodulator that is a part of Ultra Wide-Band (UWB) sensor system. Paper refers to the needs that should be focused on the design and manufacturing of microstrip filters based on LTCC (Low Temperature Co-fired Ceramic) with emphasis on issues of quality of transmitted signals in the high frequency (HF) area in the terms of actual production. There are presented simulated and measured results of insertion loss (S₂₁) and return loss (S₁₁) of microstrip BP filter for I - Q demodulator made from material system Green Tape 951 XP. This paper demonstrates the design and full-wave electromagnetic simulation of microstrip BP filter using the HyperLynx 3D EM Designer (from Mentor Graphics). It assesses the suitability of LTCC material system Green Tape 951 XP as well as conductor paste DuPont 6145 for the production of microstrip BP filters for HF area. The presented filters should be used as a BP filter mean for I - Q demodulator presented in [1] which is a part of laboratory UWB sensor system.