Abstract: Systems and methods for dielectric TM01 mode resonators are described herein. In certain embodiments, a system includes one or more electronic devices, wherein an electronic device a first input signal and provides an output signal. Further, the electronic device includes a conductive body enclosing a cavity, wherein the cavity has an interior surface. Additionally, the electronic device includes one or more dielectric resonators, wherein a dielectric resonator in the one or more dielectric resonators comprises two or more portions that are shaped differently than one another and has an axial center cavity formed therein. Moreover, the electronic device includes one or more tuning elements inserted through an external surface of the conductive body, the one or more tuning elements extending through the external surface into the axial center cavity, wherein a distance that the one or more tuning elements extend into the axial center cavity is adjustable.