Abstract: The present invention provides improved tunable filters that may provide more accurate tuning and a substantially greater tuning range as compared with conventional filters. Filters according to one or more aspects of the present invention may include improved tuning mechanisms, may include a CPU and a memory, wherein the CPU controls the tuning mechanism to tune to different frequencies responsive to a plurality of predefined filter characteristics stored in the memory. Filters according to one or more aspects of the present invention may further include two opposed ceramic pucks of approximately equal size, thereby providing a substantially larger tuning range than where the upper puck is simply a dielectric disk of a substantially different size. Further, the two opposed ceramic puck may be moved relative to each other in a non-rotational manner, thus reducing undesirable variations in the tuning of the filter.