A Wideband Frequency-Tuning Method Using Magnetically Actuated Mechanical Tuning of a SIW Resonator

In this paper, we devise and develop a simple and low-cost method to tune the resonant frequency of a substrate integrated waveguide (SIW) resonator. A capacitance-loaded coaxial resonator is designed and then a circularly shaped high-permeability foil is attached so to control the air-gap thickness generated inside the resonator. A small and commercially available magnet is subsequently used to induce a magnetic flux to the foil and it results in a continuous resonant frequency tuning from 1.39 GHz to 3.73 GHz. Detailed fabrication and measurement process are given in this paper.