Compact Dual-Band and Wideband Filters With Resonant Apertures in Rectangular Waveguide

The objective of this article is to describe a new family of microwave bandpass filters in the rectangular waveguide based on resonant apertures, which can be used to implement both single- and dual-band transfer functions. The use of capacitive stubs and a staircase configuration is also discussed in order to enhance the out-of-band response and the selectivity of the filter with respect to the state of the art. Finally, simulations are compared with measured results, showing very good agreement, thereby fully validating both the new filter topologies and the design procedure.

Automated summary

The article describes a new family of microwave bandpass filters in the rectangular waveguide based on resonant apertures, which can be used for both single- and dual-band transfer functions. The use of capacitive stubs and a staircase configuration is also discussed to improve the out-of-band response and selectivity of the filter. The simulations are compared with measured results, showing good agreement and validating the new filter topologies and design procedure.