International Journal of Engineering and Technology

Circular and Radial SIW cavity resonators are proposed to enhance the performance of SIW bandstop filter. Prior to this research work, rectangular cavity resonator was used to produce bandstop response. The design of the circular and radial SIW bandstop filters are done by directly coupling circular and radial cavity resonators to the SIW line. The SIW bandstop filters are designed to operate at X-band and implemented on Rogers RO4350 substrate with a thickness of 0.508mm. Simulated and measured results show good bandstop responses and thus useful in microwave bandstop filter design.