Dual-Path Multilayer Substrate Integrated Waveguide Circular Cavity Filter

A dual-path multilayer substrate integrated waveguidecircular cavity filter is introduces in this paper. The proposeddual-path multilayer circular cavity are designed between range4.79 GHz to 4.85 GHz is thus suitable for wireless communicationapplications including DCS, WiMax, WLAN, WiBro, Bluetoothand C-band applications such as satellite communications, andweather radar systems. Two circular cavity based on SIW areconnected via connect hole and probe which is attached at bothside of the microstrip feed lines. Width and length of the feed linesprobes have the ability to control the filter performances in termsof insertion and return loss. Measured response from fabricatedfilter shows resonant frequencies at 4.79 GHz and 5.05 GHz, andmeasured insertion loss found higher than simulation resultaround 4.47 dB. Consideration during fabrication and assemblyprocess are required to avoid higher losses. The performances ofthe filter in terms of return loss, insertion loss and resonantfrequency are analyzed in both simulations and measurement tovalidate the concept.