Dielectric Resonator Filter [Verified by Measurements]

The application note deals with complex dielectric resonator filters with numerous tuning elements. Careful comparison to measured results is carried out in each step. The story unfolds from a simple single cavity with the loop made of coax cable. The cubic dielectric puck is inserted at the middle to modify the resonance. In the next step, the puck is hollow, which changes the resonance again. WIPL-D sweeper is used to demonstrate how the resonance shifts by merely changing puck length. Such models are simple and the simulation is carried out in seconds in the entire frequency band. Single cavity with solid puck is the most important model. It is tuned to achieve a wide and deep resonance, which coincide with the measured results. A single cavity model is very fast and lasts only a couple of seconds per frequency point, where powerful built-in interpolation allows using only 11 frequency points.

In the last step, a single cavity is mirrored and connected to the second cavity with goal post. The simulation is still carried out in seconds per frequency point at regular desktop or laptop PC.

Section: Microwave Circuits

For full version of the document, please check the following pdf.