A new class of selective filters using low-Q components suitable for MMIC implementation

The losses and parasitics associated with MMIC technology prevent the realization of high-Q passive components, a necessity for highly-selective low-loss filters. For applications such as communications and radar, passive filters are preferred over active filters due to the latter´s issues with linearity and stability. This paper investigates the value of using highly-selective but lossy filters implemented using low-Q components. It is shown that equivalent system performance can be achieved with such a filter using a modified receiver architecture. A simplified lossy design technique using resistive-compensating networks is also presented.