Design and simulation of a multilayer Dual Behavior Resonator microwave filter

This article presents the design and simulation of a fourth order multilayer Dual Behavior Resonator (DBR) microwave filter. As a first step, a single layer filter design is made, based on open-circuited different-length stubs DBR structures. A two layer filter is obtained by modifying the initial design, allowing cross-couplings between non-adjacent resonators. The multilayer configuration reduces the circuit size, and has the potential to improve the filter´s electrical response. A comparison between the single layer and the multilayer designs is provided.