A new concept for the fine tuning of high-Q bandpass filters to compensate for small response deviations due to manufacturing tolerances and temperature variations is presented in the paper “MEMS-based fine tuning of high Q-factor E-plane filters”, published in the International Journal of Microwave and Wireless Technologies. (EuMA and Cambridge University Press) . The paper shows how discrete frequency tuning steps are obtained using a rectangular waveguide resonator loaded with a reconfigurable E-plane circuit. As an example, 0.1% frequency steps can easily be obtained in a 10 GHz resonant,cavity, while the use of low-loss substrates ensures high-quality factors of the order of 1000.
