Comparison of different materials for manufacturing of antialiasing LP filter

This paper deals with design, simulation, manufacturing and experimental testing of antialiasing low pass (LP) filter for I - Q demodulator that is a part of Ultra Wide-Band (UWB) sensor system. It focuses on various technological possibilities (mechanical by CNC drilling and chemical by etching) of production of printed circuit boards (PCB) for antialiasing filters that are used in the branch of UWB area. Paper demonstrates realization of LP filter designed in the Filter Solution® 2011 software from Nuhertz as well as its electromagnetic (EM) simulation made by Ansoft Designer® software from ANSYS Company. It assesses the suitability of hydrocarbon ceramic laminate RO4003C and epoxy-glass laminate FR4 for production of LP filter suitable for high frequency (HF) area. Paper refers to the needs for focusing on the design and construction of passive filters used in I - Q demodulator systems. Emphasis lay on issues of quality of transmitted signals in the HF range. It examines the potential manufacturing possibility of such filter based on Low Temperature Ceramics (LTCC) technology. There are presented simulated and measured results of insertion loss (S₂₁) and return loss (S₁₁) of LP filter for I - Q demodulator made from RO4003C and FR4 substrate. The presented filters should be used as an antialiasing LP filter mean for I - Q demodulator presented in [1] which is a part of evaluated UWB sensor system.