One incredible hurdle in the search for axions is that the allowable mass range spans more than 12 orders of magnitude, where each band requires new resonators and detection schemes to be developed. This chapters discusses the development of a new cavity for ADMX to search for axion dark matter in a frequency range of 2 to 4 GHz. The primary feature optimized in this work is unloaded quality factor of prototype cavities. Additionally, design and testing of impedance filters is discussed. This work results in a cavity design with an unloaded quality factor of approximately 10,000, which matches simulations. These results are a promising first step in developing a detector with QCD axion detection capabilities.