Despite decades of research into developing true, single-chip radio transceivers, most commercial designs continue to rely on off-chip components for bandpass filtering. Implementing these filters on-chip remains nearly as challenging today as it was IO years ago, due to the demanding system-requirements of modem radio standards, and few technologies have made it into commercial production. Exceptions include the sporadic adoption of low-Q active filters in IF subsystems and the occasional use of low-Q LC filtering in front-end designs. This paper overviews filter performance requirements and implementation alternatives, and identifies fundamental as well as technological constraints limiting their use. An example design of a Q-enhanced LC filter for Bluetooth applications at 2.4 GHz is also discussed.