K a-Band Miniaturized Quasi-Planar High-Q Resonators.

Air-filled copper Ka-band resonators with heights between 250–700 μm are demonstrated with measured un-loaded Q factors between 440–829. The low-profile quasi-planar resonators are fabricated using a sequential metal deposition process. Miniaturization of up to 70% with respect to a TE₁₀₁ quasi-planar resonator is accomplished by reducing the footprint of the resonator while maintaining the height. Finite-element simulations predict the measured resonant frequency within less than 1%. Due to fabrication imperfections, Q_un is measured to be approximately 15% less than predicted. The resonators are compatible with air-filled rectangular microcoaxial feed lines fabricated in the same metal-deposition process. [ABSTRACT FROM AUTHOR]