Cavities With Four Equivalent Magnetic Side Walls in Composite Planar Multilayered and Substrate Integrated Waveguide Structures

Magnetic wall conditions at the boundaries of a cavity may lead to its size reduction. This work addresses the realization of cavities with four virtual magnetic side walls in composite planar multilayered and substrate integrated waveguide structures. Eigenmode analyses based on numerical and analytical methods are performed. The proposed basic cavity configurations can be applied to miniaturized filter design.